Add debug hologram projector (#79)

StructureLib built the missing block name on the server, where only
en_US is loaded, so players on dedicated servers saw English names in
chat. Send the item's lang key and let the client translate it. Stacks
whose name is not a plain key, GT meta items among them, keep the old
server side name.

Players also saw two shapes of the same message: a bracketed name with
rarity color and an item tooltip from two of the survivalPlaceBlocks
branches, a bare yellow name from the stack list branch. All three now
build the name the same way.

.github/workflows/optimize-images.yml

@@ -0,0 +1,17 @@
+name: Optimize images
+
+on:
+  pull_request:
+    branches: [ master, main, release/** ]
+    paths:
+      - "**/*.png"
+
+  push:
+    branches: [ master, main, release/** ]
+    paths:
+      - "**/*.png"
+
+jobs:
+  optimize-images:
+    uses: GTNewHorizons/GTNH-Actions-Workflows/.github/workflows/optimize-images.yml@master
+    secrets: inherit

.github/workflows/publish-javadoc.yaml

@@ -5,8 +5,10 @@ on:
     branches:
       - master
       - feature/doc
+      - '**/*-javadoc'
     tags:
       - '*'
+  delete:
 
 permissions:
   contents: write
@@ -14,7 +16,38 @@ permissions:
   id-token: write
 
 jobs:
+  prune:
+    if: github.event_name == 'delete'
+    concurrency: javadoc-publish
+    runs-on: ubuntu-latest
+    outputs:
+      result_hash: ${{ steps.deploy.outputs.hash }}
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+          ref: gh-pages
+
+      - name: Deploy 🚀
+        id: deploy
+        shell: bash
+        run: |
+          if git rm -r $TARGET_FOLDER ; then
+            echo Nothing to clean up
+          fi
+
+          find . -name javadoc -type d -print | sed 's#^\./\(.*\)/javadoc$#\1#' | sort --version-sort --reverse > index.txt
+          git add index.txt
+          git config user.name "${GITHUB_ACTOR}"
+          git config user.email "${GITHUB_ACTOR_ID}-${GITHUB_ACTOR}@users.noreply.github.com"
+          git commit -m "Clean up javadoc after ref $TARGET_FOLDER is deleted"
+          git push
+          echo "hash=$(git rev-parse HEAD)" >> $GITHUB_OUTPUT
+        env:
+          TARGET_FOLDER: ${{ github.ref_name }}
+
   javadoc:
+    if: github.event_name == 'push'
     concurrency: javadoc-publish
     runs-on: ubuntu-latest
     outputs:
@@ -57,11 +90,9 @@ jobs:
           find . -name javadoc -type d -print | sed 's#^\./\(.*\)/javadoc$#\1#' | sort --version-sort --reverse > index.txt
           git add index.txt
           git config user.name "${GITHUB_ACTOR}"
-          git config user.email "${GITHUB_ACTOR}@users.noreply.github.com"
+          git config user.email "${GITHUB_ACTOR_ID}-${GITHUB_ACTOR}@users.noreply.github.com"
           git commit -m "Deploy javadoc from ref $TARGET_FOLDER"
           git push
-          echo "::set-output name=hash::$(git rev-parse HEAD)"
+          echo "hash=$(git rev-parse HEAD)" >> $GITHUB_OUTPUT
         env:
           TARGET_FOLDER: ${{ github.ref_name }}
-          COMMIT_AUTHOR: ${{ github.pusher.name }}
-          COMMIT_EMAIL: ${{ github.pusher.email }}

.gitignore

@@ -27,3 +27,4 @@ whitelist.json
 *.iws
 src/main/resources/mixins.*.json
 *.bat
+layout.json

LICENSE

@@ -0,0 +1,674 @@
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+  A patent license is "discriminatory" if it does not include within
+the scope of its coverage, prohibits the exercise of, or is
+conditioned on the non-exercise of one or more of the rights that are
+specifically granted under this License.  You may not convey a covered
+work if you are a party to an arrangement with a third party that is
+in the business of distributing software, under which you make payment
+to the third party based on the extent of your activity of conveying
+the work, and under which the third party grants, to any of the
+parties who would receive the covered work from you, a discriminatory
+patent license (a) in connection with copies of the covered work
+conveyed by you (or copies made from those copies), or (b) primarily
+for and in connection with specific products or compilations that
+contain the covered work, unless you entered into that arrangement,
+or that patent license was granted, prior to 28 March 2007.
+
+  Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+  12. No Surrender of Others' Freedom.
+
+  If conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License.  If you cannot convey a
+covered work so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you may
+not convey it at all.  For example, if you agree to terms that obligate you
+to collect a royalty for further conveying from those to whom you convey
+the Program, the only way you could satisfy both those terms and this
+License would be to refrain entirely from conveying the Program.
+
+  13. Use with the GNU Affero General Public License.
+
+  Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
+under version 3 of the GNU Affero General Public License into a single
+combined work, and to convey the resulting work.  The terms of this
+License will continue to apply to the part which is the covered work,
+but the special requirements of the GNU Affero General Public License,
+section 13, concerning interaction through a network will apply to the
+combination as such.
+
+  14. Revised Versions of this License.
+
+  The Free Software Foundation may publish revised and/or new versions of
+the GNU General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.

LICENSE.LESSER

@@ -0,0 +1,165 @@
+                   GNU LESSER GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+
+  This version of the GNU Lesser General Public License incorporates
+the terms and conditions of version 3 of the GNU General Public
+License, supplemented by the additional permissions listed below.
+
+  0. Additional Definitions.
+
+  As used herein, "this License" refers to version 3 of the GNU Lesser
+General Public License, and the "GNU GPL" refers to version 3 of the GNU
+General Public License.
+
+  "The Library" refers to a covered work governed by this License,
+other than an Application or a Combined Work as defined below.
+
+  An "Application" is any work that makes use of an interface provided
+by the Library, but which is not otherwise based on the Library.
+Defining a subclass of a class defined by the Library is deemed a mode
+of using an interface provided by the Library.
+
+  A "Combined Work" is a work produced by combining or linking an
+Application with the Library.  The particular version of the Library
+with which the Combined Work was made is also called the "Linked
+Version".
+
+  The "Minimal Corresponding Source" for a Combined Work means the
+Corresponding Source for the Combined Work, excluding any source code
+for portions of the Combined Work that, considered in isolation, are
+based on the Application, and not on the Linked Version.
+
+  The "Corresponding Application Code" for a Combined Work means the
+object code and/or source code for the Application, including any data
+and utility programs needed for reproducing the Combined Work from the
+Application, but excluding the System Libraries of the Combined Work.
+
+  1. Exception to Section 3 of the GNU GPL.
+
+  You may convey a covered work under sections 3 and 4 of this License
+without being bound by section 3 of the GNU GPL.
+
+  2. Conveying Modified Versions.
+
+  If you modify a copy of the Library, and, in your modifications, a
+facility refers to a function or data to be supplied by an Application
+that uses the facility (other than as an argument passed when the
+facility is invoked), then you may convey a copy of the modified
+version:
+
+   a) under this License, provided that you make a good faith effort to
+   ensure that, in the event an Application does not supply the
+   function or data, the facility still operates, and performs
+   whatever part of its purpose remains meaningful, or
+
+   b) under the GNU GPL, with none of the additional permissions of
+   this License applicable to that copy.
+
+  3. Object Code Incorporating Material from Library Header Files.
+
+  The object code form of an Application may incorporate material from
+a header file that is part of the Library.  You may convey such object
+code under terms of your choice, provided that, if the incorporated
+material is not limited to numerical parameters, data structure
+layouts and accessors, or small macros, inline functions and templates
+(ten or fewer lines in length), you do both of the following:
+
+   a) Give prominent notice with each copy of the object code that the
+   Library is used in it and that the Library and its use are
+   covered by this License.
+
+   b) Accompany the object code with a copy of the GNU GPL and this license
+   document.
+
+  4. Combined Works.
+
+  You may convey a Combined Work under terms of your choice that,
+taken together, effectively do not restrict modification of the
+portions of the Library contained in the Combined Work and reverse
+engineering for debugging such modifications, if you also do each of
+the following:
+
+   a) Give prominent notice with each copy of the Combined Work that
+   the Library is used in it and that the Library and its use are
+   covered by this License.
+
+   b) Accompany the Combined Work with a copy of the GNU GPL and this license
+   document.
+
+   c) For a Combined Work that displays copyright notices during
+   execution, include the copyright notice for the Library among
+   these notices, as well as a reference directing the user to the
+   copies of the GNU GPL and this license document.
+
+   d) Do one of the following:
+
+       0) Convey the Minimal Corresponding Source under the terms of this
+       License, and the Corresponding Application Code in a form
+       suitable for, and under terms that permit, the user to
+       recombine or relink the Application with a modified version of
+       the Linked Version to produce a modified Combined Work, in the
+       manner specified by section 6 of the GNU GPL for conveying
+       Corresponding Source.
+
+       1) Use a suitable shared library mechanism for linking with the
+       Library.  A suitable mechanism is one that (a) uses at run time
+       a copy of the Library already present on the user's computer
+       system, and (b) will operate properly with a modified version
+       of the Library that is interface-compatible with the Linked
+       Version.
+
+   e) Provide Installation Information, but only if you would otherwise
+   be required to provide such information under section 6 of the
+   GNU GPL, and only to the extent that such information is
+   necessary to install and execute a modified version of the
+   Combined Work produced by recombining or relinking the
+   Application with a modified version of the Linked Version. (If
+   you use option 4d0, the Installation Information must accompany
+   the Minimal Corresponding Source and Corresponding Application
+   Code. If you use option 4d1, you must provide the Installation
+   Information in the manner specified by section 6 of the GNU GPL
+   for conveying Corresponding Source.)
+
+  5. Combined Libraries.
+
+  You may place library facilities that are a work based on the
+Library side by side in a single library together with other library
+facilities that are not Applications and are not covered by this
+License, and convey such a combined library under terms of your
+choice, if you do both of the following:
+
+   a) Accompany the combined library with a copy of the same work based
+   on the Library, uncombined with any other library facilities,
+   conveyed under the terms of this License.
+
+   b) Give prominent notice with the combined library that part of it
+   is a work based on the Library, and explaining where to find the
+   accompanying uncombined form of the same work.
+
+  6. Revised Versions of the GNU Lesser General Public License.
+
+  The Free Software Foundation may publish revised and/or new versions
+of the GNU Lesser General Public License from time to time. Such new
+versions will be similar in spirit to the present version, but may
+differ in detail to address new problems or concerns.
+
+  Each version is given a distinguishing version number. If the
+Library as you received it specifies that a certain numbered version
+of the GNU Lesser General Public License "or any later version"
+applies to it, you have the option of following the terms and
+conditions either of that published version or of any later version
+published by the Free Software Foundation. If the Library as you
+received it does not specify a version number of the GNU Lesser
+General Public License, you may choose any version of the GNU Lesser
+General Public License ever published by the Free Software Foundation.
+
+  If the Library as you received it specifies that a proxy can decide
+whether future versions of the GNU Lesser General Public License shall
+apply, that proxy's public statement of acceptance of any version is
+permanent authorization for you to choose that version for the
+Library.

README.md

@@ -32,3 +32,5 @@ The project is developed using IDEA. Please manually configure the build to not
 Due to me adding in ItemStackMap, which was derived from code from CodeChicken's LGPL mod NEI. This mod is effectively considered
 licensed under LGPL in its entirety since commit ebef584b8c518f8202cfe0984fb28a6d23e52b3d or any squash commit containing it, e.g.
 609e50428ee4e293f65f67f554a70b9fcfae97c4.
+
+Note while the LICENSE.txt is added by a much later commit, all code on previous commits are covered by this as well.

addon.gradle

@@ -1,7 +1,7 @@
 javadoc {
     javadocTool = javaToolchains.javadocToolFor {
         // Last version with frames, but it also has search
-        languageVersion = JavaLanguageVersion.of(11)
+        languageVersion = JavaLanguageVersion.of(25)
         vendor = JvmVendorSpec.ADOPTIUM
     }
 
@@ -18,9 +18,8 @@ javadoc {
 
     options {
         overview "src/main/javadoc/overview.html"
-        links 'https://docs.oracle.com/javase/8/docs/api/'
+        links 'https://docs.oracle.com/en/java/javase/25/docs/api/'
         links 'https://skmedix.github.io/ForgeJavaDocs/javadoc/forge/1.7.10-10.13.4.1614/'
-        addBooleanOption("-frames", true)
     }
 }
 

dependencies.gradle

@@ -1,9 +1,9 @@
 // Add your dependencies here
 
 dependencies {
-    api("com.github.GTNewHorizons:GTNHLib:0.0.10:dev")
-    runtimeOnly("com.github.GTNewHorizons:NotEnoughItems:2.3.46-GTNH:dev")
-
+    api("com.github.GTNewHorizons:GTNHLib:0.11.21:dev")
+    implementation("com.github.GTNewHorizons:NotEnoughItems:2.8.110-GTNH:dev")
     testImplementation(platform('org.junit:junit-bom:5.9.2'))
     testImplementation('org.junit.jupiter:junit-jupiter')
+	testRuntimeOnly ('org.junit.platform:junit-platform-launcher')
 }

gradle.properties

@@ -1,60 +1,238 @@
+# ExampleMod tag to use as Blowdryer (Spotless, etc.) settings version, leave empty to disable.
+# LOCAL to test local config updates.
+gtnh.settings.blowdryerTag = 0.2.0
+
+# Human-readable mod name, available for mcmod.info population.
 modName = StructureLib
 
-# This is a case-sensitive string to identify your mod. Convention is to use lower case.
+# Case-sensitive identifier string, available for mcmod.info population and used for automatic mixin JSON generation.
+# Conventionally lowercase.
 modId = structurelib
 
+# Root package of the mod, used to find various classes in other properties,
+# mcmod.info substitution, enabling assertions in run tasks, etc.
 modGroup = com.gtnewhorizon.structurelib
 
-# WHY is there no version field?
-# The build script relies on git to provide a version via tags. It is super easy and will enable you to always know the
-# code base or your binary. Check out this tutorial: https://blog.mattclemente.com/2017/10/13/versioning-with-git-tags/
+# Whether to use modGroup as the maven publishing group.
+# When false, com.github.GTNewHorizons is used.
+useModGroupForPublishing = false
 
-# Will update your build.gradle automatically whenever an update is available
+# Updates your build.gradle and settings.gradle automatically whenever an update is available.
 autoUpdateBuildScript = false
 
+# Version of Minecraft to target
 minecraftVersion = 1.7.10
+
+# Version of Minecraft Forge to target
 forgeVersion = 10.13.4.1614
 
-# Select a username for testing your mod with breakpoints. You may leave this empty for a random user name each time you
-# restart Minecraft in development. Choose this dependent on your mod:
-# Do you need consistent player progressing (for example Thaumcraft)? -> Select a name
-# Do you need to test how your custom blocks interacts with a player that is not the owner? -> leave name empty
-developmentEnvironmentUserName = "Developer"
+# Specify an MCP channel for dependency deobfuscation and the deobfParams task.
+channel = stable
 
-# Define a source file of your project with:
-# public static final String VERSION = "GRADLETOKEN_VERSION";
-# The string's content will be replaced with your mods version when compiled. You should use this to specify your mod's
-# version in @Mod([...], version = VERSION, [...])
-# Leave these properties empty to skip individual token replacements
-replaceGradleTokenInFile = StructureLib.java
+# Specify an MCP mappings version for dependency deobfuscation and the deobfParams task.
+mappingsVersion = 12
+
+# Defines other MCP mappings for dependency deobfuscation.
+remoteMappings = https\://raw.githubusercontent.com/MinecraftForge/FML/1.7.10/conf/
+
+# Select a default username for testing your mod. You can always override this per-run by running
+# `./gradlew runClient --username=AnotherPlayer`, or configuring this command in your IDE.
+developmentEnvironmentUserName = Developer
+
+# Enables modern Java syntax support. Valid values:
+# - false: No modern syntax, Java 8 only
+# - jabel: Jabel syntax-only support, compiles to J8 bytecode
+# - jvmDowngrader: Full modern Java via JVM Downgrader (syntax + stdlib APIs)
+# - modern: Native modern Java bytecode, no downgrading
+enableModernJavaSyntax = jabel
+
+# If set, ignores the above setting and compiles with the given toolchain. This may cause unexpected issues,
+# and should *not* be used in most situations. -1 disables this.
+# forceToolchainVersion = -1
+
+# Target JVM version for JVM Downgrader bytecode downgrading.
+# Only used when enableModernJavaSyntax = jvmDowngrader
+# downgradeTargetVersion = 8
+
+# Comma-separated list of Java versions for multi-release jar support (JVM Downgrader only).
+# Classes will be available in META-INF/versions/N/ for each version N in this list.
+# Default: "21,25" (J25+ gets native classes, J21-24 gets partial downgrade, J8-20 gets full downgrade).
+# jvmDowngraderMultiReleaseVersions = 21,25
+
+# Specifies how JVM Downgrader API stubs are provided. Options:
+# - shade: Shade minimized stubs into the jar
+# - gtnhlib: GTNHLib provides stubs at runtime (adds version constraint)
+# - external: Another dependency provides stubs (no constraint, no warning)
+# - (empty): Warning reminding you to configure stubs
+# Note: 'shade' option requires you to verify license compliance, see: https://github.com/unimined/JvmDowngrader/blob/main/LICENSE.md
+# jvmDowngraderStubsProvider =
+
+# Enables injecting missing generics into the decompiled source code for a better coding experience.
+# Turns most publicly visible List, Map, etc. into proper List<E>, Map<K, V> types.
+enableGenericInjection = true
+
+# Generate a class with a String field for the mod version named as defined below.
+# If generateGradleTokenClass is empty or not missing, no such class will be generated.
+# If gradleTokenVersion is empty or missing, the field will not be present in the class.
+generateGradleTokenClass = com.gtnewhorizon.structurelib.Tags
+
+# Name of the token containing the project's current version to generate/replace.
+gradleTokenVersion = VERSION
+
+# [DEPRECATED] Mod ID replacement token.
 gradleTokenModId =
+
+# [DEPRECATED] Mod name replacement token.
 gradleTokenModName =
-gradleTokenVersion = GRADLETOKEN_VERSION
+
+# [DEPRECATED] Mod Group replacement token.
 gradleTokenGroupName =
 
-# In case your mod provides an API for other mods to implement you may declare its package here. Otherwise you can
+# [DEPRECATED]
+# Multiple source files can be defined here by providing a comma-separated list: Class1.java,Class2.java,Class3.java
+# public static final String VERSION = "GRADLETOKEN_VERSION";
+# The string's content will be replaced with your mod's version when compiled. You should use this to specify your mod's
+# version in @Mod([...], version = VERSION, [...]).
+# Leave these properties empty to skip individual token replacements.
+replaceGradleTokenInFile =
+
+# In case your mod provides an API for other mods to implement you may declare its package here. Otherwise, you can
 # leave this property empty.
-# Example value: apiPackage = api + modGroup = com.myname.mymodid -> com.myname.mymodid.api
+# Example value: (apiPackage = api) + (modGroup = com.myname.mymodid) -> com.myname.mymodid.api
 apiPackage =
 
-# Specify the configuration file for Forge's access transformers here. I must be placed into /src/main/resources/META-INF/
-# Example value: mymodid_at.cfg
+# Specify the configuration file for Forge's access transformers here. It must be placed into /src/main/resources/META-INF/
+# There can be multiple files in a space-separated list.
+# Example value: mymodid_at.cfg nei_at.cfg
 accessTransformersFile =
 
 # Provides setup for Mixins if enabled. If you don't know what mixins are: Keep it disabled!
-usesMixins = false
+usesMixins = true
+
+# Set to a non-empty string to configure mixins in a separate source set under src/VALUE, instead of src/main.
+# This can speed up compile times thanks to not running the mixin annotation processor on all input sources.
+# Mixin classes will have access to "main" classes, but not the other way around.
+separateMixinSourceSet =
+
+# Adds some debug arguments like verbose output and class export.
+usesMixinDebug = false
+
 # Specify the location of your implementation of IMixinConfigPlugin. Leave it empty otherwise.
 mixinPlugin =
-# Specify the package that contains all of your Mixins. You may only place Mixins in this package or the build will fail!
-mixinsPackage =
+
+# Specify the package that contains all of your Mixins. The package must exist or
+# the build will fail. If you have a package property defined in your mixins.<modid>.json,
+# it must match with this or the build will fail.
+mixinsPackage = mixins
+
 # Specify the core mod entry class if you use a core mod. This class must implement IFMLLoadingPlugin!
-# This parameter is for legacy compatability only
-# Example value: coreModClass = asm.FMLPlugin + modGroup = com.myname.mymodid -> com.myname.mymodid.asm.FMLPlugin
-coreModClass =
+# This parameter is for legacy compatibility only
+# Example value: (coreModClass = asm.FMLPlugin) + (modGroup = com.myname.mymodid) -> com.myname.mymodid.asm.FMLPlugin
+coreModClass = core.StructureLibCore
+
 # If your project is only a consolidation of mixins or a core mod and does NOT contain a 'normal' mod ( = some class
 # that is annotated with @Mod) you want this to be true. When in doubt: leave it on false!
 containsMixinsAndOrCoreModOnly = false
 
-# If enabled, you may use 'shadowImplementation' for dependencies. They will be integrated in your jar. It is your
-# responsibility check the licence and request permission for distribution, if required.
+# Enables Mixins even if this mod doesn't use them, useful if one of the dependencies uses mixins.
+forceEnableMixins = false
+
+# If enabled, you may use 'shadowCompile' for dependencies. They will be integrated into your jar. It is your
+# responsibility to check the license and request permission for distribution if required.
 usesShadowedDependencies = false
+
+# If disabled, won't remove unused classes from shadowed dependencies. Some libraries use reflection to access
+# their own classes, making the minimization unreliable.
+minimizeShadowedDependencies = true
+
+# If disabled, won't rename the shadowed classes.
+relocateShadowedDependencies = true
+
+# Adds CurseMaven, Modrinth, and some more well-known 1.7.10 repositories.
+includeWellKnownRepositories = true
+
+# A list of repositories to exclude from the includeWellKnownRepositories setting. Should be a space separated
+# list of strings, with the acceptable keys being(case does not matter):
+# cursemaven
+# modrinth
+excludeWellKnownRepositories =
+
+# Change these to your Maven coordinates if you want to publish to a custom Maven repository instead of the default GTNH Maven.
+# Authenticate with the MAVEN_USER and MAVEN_PASSWORD environment variables.
+# If you need a more complex setup disable maven publishing here and add a publishing repository to addon.gradle.
+usesMavenPublishing = true
+
+# Maven repository to publish the mod to.
+# mavenPublishUrl = https\://nexus.gtnewhorizons.com/repository/releases/
+
+# Publishing to Modrinth requires you to set the MODRINTH_TOKEN environment variable to your current Modrinth API token.
+#
+# The project's ID on Modrinth. Can be either the slug or the ID.
+# Leave this empty if you don't want to publish to Modrinth.
+modrinthProjectId =
+
+# The project's relations on Modrinth. You can use this to refer to other projects on Modrinth.
+# Syntax: scope1-type1:name1;scope2-type2:name2;...
+# Where scope can be one of [required, optional, incompatible, embedded],
+#       type can be one of [project, version],
+#       and the name is the Modrinth project or version slug/id of the other mod.
+# Example: required-project:fplib;optional-project:gasstation;incompatible-project:gregtech
+# Note: UniMixins is automatically set as a required dependency if usesMixins = true.
+modrinthRelations =
+
+# Publishing to CurseForge requires you to set the CURSEFORGE_TOKEN environment variable to one of your CurseForge API tokens.
+#
+# The project's numeric ID on CurseForge. You can find this in the About Project box.
+# Leave this empty if you don't want to publish on CurseForge.
+curseForgeProjectId =
+
+# The project's relations on CurseForge. You can use this to refer to other projects on CurseForge.
+# Syntax: type1:name1;type2:name2;...
+# Where type can be one of [requiredDependency, embeddedLibrary, optionalDependency, tool, incompatible],
+#       and the name is the CurseForge project slug of the other mod.
+# Example: requiredDependency:railcraft;embeddedLibrary:cofhlib;incompatible:buildcraft
+# Note: UniMixins is automatically set as a required dependency if usesMixins = true.
+curseForgeRelations =
+
+# Optional parameter to customize the produced artifacts. Use this to preserve artifact naming when migrating older
+# projects. New projects should not use this parameter.
+# customArchiveBaseName =
+
+# Optional parameter to customize the default working directory used by the runClient* tasks. Relative to the project directory.
+# runClientWorkingDirectory = run/client
+
+# Optional parameter to customize the default working directory used by the runServer* tasks. Relative to the project directory.
+# runServerWorkingDirectory = run/server
+
+# Optional parameter to have the build automatically fail if an illegal version is used.
+# This can be useful if you e.g. only want to allow versions in the form of '1.1.xxx'.
+# The check is ONLY performed if the version is a git tag.
+# Note: the specified string must be escaped, so e.g. 1\\.1\\.\\d+ instead of 1\.1\.\d+
+# versionPattern =
+
+# Uncomment to prevent the source code from being published.
+# noPublishedSources = true
+
+# Uncomment this to disable Spotless checks.
+# This should only be uncommented to keep it easier to sync with upstream/other forks.
+# That is, if there is no other active fork/upstream, NEVER change this.
+# disableSpotless = true
+
+# Uncomment this to disable Checkstyle checks (currently wildcard import check).
+# disableCheckstyle = true
+
+# Override the IDEA build type. Valid values are: "" (leave blank, do not override), "idea" (force use native IDEA build), "gradle"
+# (force use delegated build).
+# This is meant to be set in $HOME/.gradle/gradle.properties.
+# e.g. add "systemProp.org.gradle.project.ideaOverrideBuildType=idea" will override the build type to be native build.
+# WARNING: If you do use this option, it will overwrite whatever you have in your existing projects. This might not be what you want!
+# Usually there is no need to uncomment this here as other developers do not necessarily use the same build type as you.
+# ideaOverrideBuildType = idea
+
+# Whether IDEA should run spotless checks when pressing the Build button.
+# This is meant to be set in $HOME/.gradle/gradle.properties.
+# ideaCheckSpotlessOnBuild = true
+
+# Non-GTNH properties
+org.gradle.configuration-cache = true
+org.gradle.parallel = true

gradle/gradle-daemon-jvm.properties

@@ -0,0 +1,12 @@
+#This file is generated by updateDaemonJvm
+toolchainUrl.FREE_BSD.AARCH64=https\://api.foojay.io/disco/v3.0/ids/cf726b4a1c84b50457225f9bba6d7650/redirect
+toolchainUrl.FREE_BSD.X86_64=https\://api.foojay.io/disco/v3.0/ids/fa1e318c287360478e3c83a9a3ef1007/redirect
+toolchainUrl.LINUX.AARCH64=https\://api.foojay.io/disco/v3.0/ids/cf726b4a1c84b50457225f9bba6d7650/redirect
+toolchainUrl.LINUX.X86_64=https\://api.foojay.io/disco/v3.0/ids/fa1e318c287360478e3c83a9a3ef1007/redirect
+toolchainUrl.MAC_OS.AARCH64=https\://api.foojay.io/disco/v3.0/ids/c2dd35c9d0aaf0ba6ad0791320f99dfc/redirect
+toolchainUrl.MAC_OS.X86_64=https\://api.foojay.io/disco/v3.0/ids/e5810bd7fd1f8a586644409d395a7e55/redirect
+toolchainUrl.UNIX.AARCH64=https\://api.foojay.io/disco/v3.0/ids/cf726b4a1c84b50457225f9bba6d7650/redirect
+toolchainUrl.UNIX.X86_64=https\://api.foojay.io/disco/v3.0/ids/fa1e318c287360478e3c83a9a3ef1007/redirect
+toolchainUrl.WINDOWS.AARCH64=https\://api.foojay.io/disco/v3.0/ids/7b3c4877c0749019e6805bb61e421497/redirect
+toolchainUrl.WINDOWS.X86_64=https\://api.foojay.io/disco/v3.0/ids/d76df094a9cbbabd3b08251f9e61444a/redirect
+toolchainVersion=25

gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,7 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-7.6-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-9.4.0-bin.zip
 networkTimeout=10000
+validateDistributionUrl=true
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists

gradlew

@@ -1,7 +1,7 @@
 #!/bin/sh
 
 #
-# Copyright © 2015-2021 the original authors.
+# Copyright © 2015 the original authors.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -15,6 +15,8 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
+# SPDX-License-Identifier: Apache-2.0
+#
 
 ##############################################################################
 #
@@ -55,7 +57,7 @@
 #       Darwin, MinGW, and NonStop.
 #
 #   (3) This script is generated from the Groovy template
-#       https://github.com/gradle/gradle/blob/HEAD/subprojects/plugins/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       https://github.com/gradle/gradle/blob/b631911858264c0b6e4d6603d677ff5218766cee/platforms/jvm/plugins-application/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
 #       within the Gradle project.
 #
 #       You can find Gradle at https://github.com/gradle/gradle/.
@@ -83,10 +85,8 @@ done
 # This is normally unused
 # shellcheck disable=SC2034
 APP_BASE_NAME=${0##*/}
-APP_HOME=$( cd "${APP_HOME:-./}" && pwd -P ) || exit
-
-# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
-DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+# Discard cd standard output in case $CDPATH is set (https://github.com/gradle/gradle/issues/25036)
+APP_HOME=$( cd -P "${APP_HOME:-./}" > /dev/null && printf '%s\n' "$PWD" ) || exit
 
 # Use the maximum available, or set MAX_FD != -1 to use that value.
 MAX_FD=maximum
@@ -114,7 +114,6 @@ case "$( uname )" in                #(
   NONSTOP* )        nonstop=true ;;
 esac
 
-CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
 
 
 # Determine the Java command to use to start the JVM.
@@ -133,10 +132,13 @@ location of your Java installation."
     fi
 else
     JAVACMD=java
-    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+    if ! command -v java >/dev/null 2>&1
+    then
+        die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
 
 Please set the JAVA_HOME variable in your environment to match the
 location of your Java installation."
+    fi
 fi
 
 # Increase the maximum file descriptors if we can.
@@ -144,7 +146,7 @@ if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
     case $MAX_FD in #(
       max*)
         # In POSIX sh, ulimit -H is undefined. That's why the result is checked to see if it worked.
-        # shellcheck disable=SC3045
+        # shellcheck disable=SC2039,SC3045
         MAX_FD=$( ulimit -H -n ) ||
             warn "Could not query maximum file descriptor limit"
     esac
@@ -152,7 +154,7 @@ if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
       '' | soft) :;; #(
       *)
         # In POSIX sh, ulimit -n is undefined. That's why the result is checked to see if it worked.
-        # shellcheck disable=SC3045
+        # shellcheck disable=SC2039,SC3045
         ulimit -n "$MAX_FD" ||
             warn "Could not set maximum file descriptor limit to $MAX_FD"
     esac
@@ -169,7 +171,6 @@ fi
 # For Cygwin or MSYS, switch paths to Windows format before running java
 if "$cygwin" || "$msys" ; then
     APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
-    CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
 
     JAVACMD=$( cygpath --unix "$JAVACMD" )
 
@@ -197,16 +198,19 @@ if "$cygwin" || "$msys" ; then
     done
 fi
 
-# Collect all arguments for the java command;
-#   * $DEFAULT_JVM_OPTS, $JAVA_OPTS, and $GRADLE_OPTS can contain fragments of
-#     shell script including quotes and variable substitutions, so put them in
-#     double quotes to make sure that they get re-expanded; and
-#   * put everything else in single quotes, so that it's not re-expanded.
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Collect all arguments for the java command:
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and optsEnvironmentVar are not allowed to contain shell fragments,
+#     and any embedded shellness will be escaped.
+#   * For example: A user cannot expect ${Hostname} to be expanded, as it is an environment variable and will be
+#     treated as '${Hostname}' itself on the command line.
 
 set -- \
         "-Dorg.gradle.appname=$APP_BASE_NAME" \
-        -classpath "$CLASSPATH" \
-        org.gradle.wrapper.GradleWrapperMain \
+        -jar "$APP_HOME/gradle/wrapper/gradle-wrapper.jar" \
         "$@"
 
 # Stop when "xargs" is not available.

gradlew.bat

@@ -13,6 +13,8 @@
 @rem See the License for the specific language governing permissions and
 @rem limitations under the License.
 @rem
+@rem SPDX-License-Identifier: Apache-2.0
+@rem
 
 @if "%DEBUG%"=="" @echo off
 @rem ##########################################################################
@@ -43,11 +45,11 @@ set JAVA_EXE=java.exe
 %JAVA_EXE% -version >NUL 2>&1
 if %ERRORLEVEL% equ 0 goto execute
 
-echo.
-echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
-echo.
-echo Please set the JAVA_HOME variable in your environment to match the
-echo location of your Java installation.
+echo. 1>&2
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
 
 goto fail
 
@@ -57,22 +59,21 @@ set JAVA_EXE=%JAVA_HOME%/bin/java.exe
 
 if exist "%JAVA_EXE%" goto execute
 
-echo.
-echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
-echo.
-echo Please set the JAVA_HOME variable in your environment to match the
-echo location of your Java installation.
+echo. 1>&2
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
 
 goto fail
 
 :execute
 @rem Setup the command line
 
-set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
 
 
 @rem Execute Gradle
-"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -jar "%APP_HOME%\gradle\wrapper\gradle-wrapper.jar" %*
 
 :end
 @rem End local scope for the variables with windows NT shell

repositories.gradle

@@ -1,8 +1,4 @@
 // Add any additional repositiroes for your dependencies here
 
 repositories {
-    maven {
-        name = "GTNH"
-        url = "http://jenkins.usrv.eu:8081/nexus/content/groups/public/"
-    }
 }

settings.gradle

@@ -4,10 +4,10 @@ pluginManagement {
         maven {
             // RetroFuturaGradle
             name "GTNH Maven"
-            url "http://jenkins.usrv.eu:8081/nexus/content/groups/public/"
-            allowInsecureProtocol = true
+            url "https://nexus.gtnewhorizons.com/repository/public/"
             mavenContent {
-                includeGroup("com.gtnewhorizons.retrofuturagradle")
+                includeGroup("com.gtnewhorizons")
+                includeGroupByRegex("com\\.gtnewhorizons\\..+")
             }
         }
         gradlePluginPortal()
@@ -17,12 +17,7 @@ pluginManagement {
 }
 
 plugins {
-    id 'com.diffplug.blowdryerSetup' version '1.6.0'
-    id 'org.gradle.toolchains.foojay-resolver-convention' version '0.4.0' // Provides java toolchains
+    id 'com.gtnewhorizons.gtnhsettingsconvention' version '2.0.26'
 }
 
-blowdryerSetup {
-    repoSubfolder 'gtnhShared'
-    github('GTNewHorizons/ExampleMod1.7.10', 'tag', '0.2.0')
-    //devLocal '.' // Use this when testing config updates locally
-}
+

src/main/java/com/gtnewhorizon/structurelib/ChannelDescription.java

@@ -0,0 +1,94 @@
+package com.gtnewhorizon.structurelib;
+
+import java.util.AbstractMap;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.Locale;
+import java.util.Map;
+import java.util.Set;
+import java.util.stream.Collectors;
+
+import net.minecraft.item.ItemStack;
+
+import com.gtnewhorizon.gtnhlib.util.map.ItemStackMap;
+
+import cpw.mods.fml.common.Loader;
+
+// this is not an API! go check StructureLibAPI instead!
+public class ChannelDescription {
+
+    private static final ItemStackMap<Set<ChannelDescription>> itemToChannels = new ItemStackMap<>(true);
+    private static final Map<String, ChannelDescription> registry = new HashMap<>();
+    private final String channel;
+    private final Map<String, String> descriptions = new HashMap<>();
+    private final ItemStackMap<Integer> items = new ItemStackMap<>(true);
+
+    public static ChannelDescription get(final String channel) {
+        if (StructureLibAPI.isDebugEnabled() && !channel.toLowerCase(Locale.ROOT).equals(channel))
+            throw new IllegalArgumentException("Channel name can be lower case ONLY");
+        return registry.computeIfAbsent(channel, ChannelDescription::new);
+    }
+
+    public static boolean has(final String channel) {
+        if (StructureLibAPI.isDebugEnabled() && !channel.toLowerCase(Locale.ROOT).equals(channel))
+            throw new IllegalArgumentException("Channel name can be lower case ONLY");
+        return registry.containsKey(channel);
+    }
+
+    public static Collection<Map.Entry<String, Integer>> iterate(final ItemStack block) {
+        Set<ChannelDescription> channels = itemToChannels.get(block);
+        if (channels == null) return Collections.emptySet();
+        return channels.stream().map(d -> new AbstractMap.SimpleImmutableEntry<>(d.channel, d.items.get(block)))
+                .collect(Collectors.toList());
+    }
+
+    public static void set(final String channel, final String modid, final String description) {
+        if (StructureLibAPI.isDebugEnabled() && !channel.toLowerCase(Locale.ROOT).equals(channel))
+            throw new IllegalArgumentException("Channel name can be lower case ONLY");
+        registry.computeIfAbsent(channel, ChannelDescription::new).add(modid, description);
+    }
+
+    public static void item(final String channel, int channelValue, ItemStack stack) {
+        if (StructureLibAPI.isDebugEnabled()) {
+            if (!channel.toLowerCase(Locale.ROOT).equals(channel)) {
+                throw new IllegalArgumentException("Channel name can be lower case ONLY");
+            }
+            if (channelValue <= 0) {
+                throw new IllegalArgumentException("Channel value must be greater than 0");
+            }
+        }
+        ChannelDescription inst = registry.computeIfAbsent(channel, ChannelDescription::new);
+        inst.items.put(stack, channelValue);
+        itemToChannels.computeIfAbsent(stack, s -> new HashSet<>()).add(inst);
+    }
+
+    public static Map<String, ChannelDescription> getAll() {
+        return Collections.unmodifiableMap(registry);
+    }
+
+    private ChannelDescription(String channel) {
+        this.channel = channel;
+    }
+
+    public String getChannel() {
+        return channel;
+    }
+
+    public ChannelDescription add(String modid, String description) {
+        if (Loader.instance().getIndexedModList().get(modid) == null) {
+            throw new IllegalArgumentException("Mod not found: " + modid);
+        }
+        descriptions.put(modid, description);
+        return this;
+    }
+
+    public Map<String, String> getDescriptions() {
+        return Collections.unmodifiableMap(descriptions);
+    }
+
+    public Map<ItemStack, Integer> getItems() {
+        return Collections.unmodifiableMap(items);
+    }
+}

src/main/java/com/gtnewhorizon/structurelib/ChannelPickHandler.java

@@ -0,0 +1,88 @@
+package com.gtnewhorizon.structurelib;
+
+import java.util.Collection;
+import java.util.Map;
+
+import javax.annotation.Nullable;
+
+import net.minecraft.block.Block;
+import net.minecraft.entity.player.EntityPlayer;
+import net.minecraft.entity.player.EntityPlayerMP;
+import net.minecraft.item.ItemStack;
+import net.minecraft.util.ChatComponentTranslation;
+import net.minecraft.util.MovingObjectPosition;
+import net.minecraft.world.World;
+
+import com.gtnewhorizon.structurelib.alignment.constructable.ChannelDataAccessor;
+import com.gtnewhorizon.structurelib.net.SetChannelDataMessage;
+
+/**
+ * Handler for middle-click channel picking. When the player holds a hologram projector on the cursor and middle-clicks
+ * a registered indicator item, the corresponding channel is set on the projector. The same applies in world when the
+ * projector is held in hand and a registered indicator block is middle-clicked. Shift+middle-click wipes all channels.
+ * Was made side neutral to support server-side validation at some point if necessary.
+ */
+public final class ChannelPickHandler {
+
+    private ChannelPickHandler() {}
+
+    /**
+     * Handle a middle-click event while holding a hologram projector on the cursor.
+     */
+    public static boolean handleMiddleClick(EntityPlayer player, ItemStack holoStack, @Nullable ItemStack targetStack,
+            final boolean isSneaking) {
+        return handlePick(player, holoStack, targetStack, isSneaking, true);
+    }
+
+    public static boolean handleWorldPick(World world, EntityPlayer player, ItemStack holoStack,
+            @Nullable MovingObjectPosition hit, final boolean isSneaking) {
+        ItemStack targetStack = null;
+
+        if (hit != null) {
+            Block block = world.getBlock(hit.blockX, hit.blockY, hit.blockZ);
+            if (!block.isAir(world, hit.blockX, hit.blockY, hit.blockZ)) {
+                targetStack = block.getPickBlock(hit, world, hit.blockX, hit.blockY, hit.blockZ, player);
+            }
+        }
+
+        // A null target still goes through so that shift+middle-click wipes even when aiming at nothing
+        return handlePick(player, holoStack, targetStack, isSneaking, false);
+    }
+
+    private static boolean handlePick(EntityPlayer player, ItemStack holoStack, @Nullable ItemStack targetStack,
+            final boolean isSneaking, final boolean onCursor) {
+        // Clear channels on shift+middle-click. The "press again to confirm" gesture is gated client-side
+        // (see ChannelWipeConfirmation) before this method is ever called.
+        if (isSneaking) {
+            ChannelDataAccessor.wipeChannelData(holoStack);
+            sendChannelData(player, holoStack, onCursor);
+            player.addChatMessage(new ChatComponentTranslation("structurelib.pickchannel.cleared"));
+            return true;
+        }
+
+        if (targetStack == null) return false; // nothing hovered, cancel silently
+
+        Collection<Map.Entry<String, Integer>> channels = ChannelDescription.iterate(targetStack);
+        if (channels.isEmpty()) {
+            player.addChatMessage(new ChatComponentTranslation("structurelib.pickchannel.nomapping"));
+            return false;
+        }
+
+        // Assuming there's only 1 channel per item for now (same behavior as drag and drop)
+        Map.Entry<String, Integer> first = channels.iterator().next();
+        ChannelDataAccessor.setChannelData(holoStack, first.getKey(), first.getValue());
+        sendChannelData(player, holoStack, onCursor);
+        player.addChatMessage(
+                new ChatComponentTranslation("structurelib.pickchannel.success", first.getKey(), first.getValue()));
+        return true;
+    }
+
+    /**
+     * Player is the one triggering this update, so should already be in-sync.
+     */
+    private static void sendChannelData(EntityPlayer player, ItemStack holoStack, boolean onCursor) {
+        if (!(player instanceof EntityPlayerMP)) {
+            StructureLib.net.sendToServer(new SetChannelDataMessage(holoStack, onCursor));
+        }
+    }
+}

src/main/java/com/gtnewhorizon/structurelib/ChannelWipeConfirmation.java

@@ -0,0 +1,33 @@
+package com.gtnewhorizon.structurelib;
+
+import net.minecraft.client.Minecraft;
+import net.minecraft.entity.player.EntityPlayer;
+import net.minecraft.util.ChatComponentTranslation;
+
+/**
+ * Client-side-only confirmation gate for "wipe all channels" shift+middle-click gesture.
+ */
+public final class ChannelWipeConfirmation {
+
+    private static final long CONFIRM_WINDOW_MS = 5000;
+    private static long armedAtMs = -1;
+
+    private ChannelWipeConfirmation() {}
+
+    /**
+     * Call this before invoking {@link ChannelPickHandler} whenever the wipe gesture (shift+middle-click) is detected.
+     *
+     * @return true if this is a confirming second press within the window and the wipe should proceed now; false if
+     *         this press only armed the confirmation.
+     */
+    public static boolean confirm(EntityPlayer player) {
+        long now = Minecraft.getSystemTime();
+        if (now - armedAtMs > CONFIRM_WINDOW_MS) {
+            armedAtMs = now;
+            player.addChatMessage(new ChatComponentTranslation("structurelib.pickchannel.confirmwipe"));
+            return false;
+        }
+        armedAtMs = -1;
+        return true;
+    }
+}

src/main/java/com/gtnewhorizon/structurelib/ClientProxy.java

@@ -2,15 +2,24 @@ package com.gtnewhorizon.structurelib;
 
 import static com.gtnewhorizon.structurelib.StructureLib.RANDOM;
 
-import java.util.*;
+import java.lang.ref.WeakReference;
+import java.util.ArrayList;
+import java.util.Comparator;
+import java.util.HashMap;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.Map;
+import java.util.UUID;
 
 import net.minecraft.block.Block;
 import net.minecraft.client.Minecraft;
+import net.minecraft.client.entity.EntityClientPlayerMP;
 import net.minecraft.client.gui.GuiNewChat;
 import net.minecraft.client.particle.EntityFX;
 import net.minecraft.client.renderer.Tessellator;
 import net.minecraft.client.renderer.culling.Frustrum;
 import net.minecraft.client.renderer.texture.TextureMap;
+import net.minecraft.client.resources.I18n;
 import net.minecraft.entity.Entity;
 import net.minecraft.entity.player.EntityPlayer;
 import net.minecraft.entity.player.EntityPlayerMP;
@@ -21,20 +30,33 @@ import net.minecraft.util.IChatComponent;
 import net.minecraft.util.IIcon;
 import net.minecraft.util.Vec3;
 import net.minecraft.world.World;
+import net.minecraftforge.client.event.MouseEvent;
 import net.minecraftforge.client.event.RenderWorldLastEvent;
 import net.minecraftforge.common.MinecraftForge;
+import net.minecraftforge.common.config.ConfigElement;
+import net.minecraftforge.event.entity.EntityJoinWorldEvent;
 import net.minecraftforge.event.world.WorldEvent;
 
+import org.apache.commons.lang3.tuple.Pair;
 import org.lwjgl.opengl.GL11;
 
 import com.gtnewhorizon.structurelib.entity.fx.WeightlessParticleFX;
+import com.gtnewhorizon.structurelib.item.ItemConstructableTrigger;
+import com.gtnewhorizon.structurelib.net.RegistryOrderSyncMessage;
 import com.gtnewhorizon.structurelib.net.SetChannelDataMessage;
 
+import cpw.mods.fml.client.config.GuiConfig;
+import cpw.mods.fml.client.event.ConfigChangedEvent;
 import cpw.mods.fml.common.FMLCommonHandler;
+import cpw.mods.fml.common.event.FMLLoadCompleteEvent;
 import cpw.mods.fml.common.event.FMLPreInitializationEvent;
+import cpw.mods.fml.common.eventhandler.EventPriority;
 import cpw.mods.fml.common.eventhandler.SubscribeEvent;
 import cpw.mods.fml.common.gameevent.TickEvent.ClientTickEvent;
 import cpw.mods.fml.common.gameevent.TickEvent.Phase;
+import cpw.mods.fml.common.network.FMLNetworkEvent;
+import cpw.mods.fml.relauncher.Side;
+import cpw.mods.fml.relauncher.SideOnly;
 
 public class ClientProxy extends CommonProxy {
 
@@ -46,7 +68,6 @@ public class ClientProxy extends CommonProxy {
      */
     private static final List<HintGroup> allGroups = new ArrayList<>();
 
-    public static int HOLOGRAM_LIFETIME = 200;
     /**
      * Current batch of hints. Belongs to the same logical multiblock.
      */
@@ -247,6 +268,47 @@ public class ClientProxy extends CommonProxy {
             ((IStructureCompat) StructureLib.COMPAT).markTextureUsed(icon);
     }
 
+    static void sendRegistryOrderToServer() {
+        if (FMLEventHandler.configSent) return;
+        FMLEventHandler.configSent = true;
+        for (String s : SortedRegistry.ALL_REGISTRIES.keySet()) {
+            Pair<List<String>, List<String>> registryOrder = ConfigurationHandler.INSTANCE.getRegistryOrder(s);
+            if (registryOrder == null || registryOrder.getKey().isEmpty() && registryOrder.getValue().isEmpty())
+                continue;
+            StructureLib.net
+                    .sendToServer(new RegistryOrderSyncMessage(s, registryOrder.getKey(), registryOrder.getValue()));
+        }
+    }
+
+    @Override
+    public void loadComplete(FMLLoadCompleteEvent evt) {
+        super.loadComplete(evt);
+        for (Map.Entry<String, WeakReference<SortedRegistry<?>>> e : SortedRegistry.ALL_REGISTRIES.entrySet()) {
+            SortedRegistry<?> r = e.getValue().get();
+            if (r == null) continue;
+            Pair<List<String>, List<String>> p = ConfigurationHandler.INSTANCE.getRegistryOrder(e.getKey());
+            r.registerOrdering(getSPPlayerUUID(), p.getKey(), p.getValue());
+        }
+    }
+
+    public UUID getSPPlayerUUID() {
+        return EntityPlayer.func_146094_a(Minecraft.getMinecraft().getSession().func_148256_e());
+    }
+
+    public void displayConfigGUI(String category) {
+        ConfigElement<Object> element = new ConfigElement<>(
+                ConfigurationHandler.INSTANCE.getConfig().getCategory(category));
+        GuiConfig guiConfig = new GuiConfig(
+                null,
+                element.getChildElements(),
+                StructureLibAPI.MOD_ID,
+                null,
+                false,
+                false,
+                I18n.format(element.getLanguageKey()));
+        Minecraft.getMinecraft().displayGuiScreen(guiConfig);
+    }
+
     private static class HintGroup {
 
         private final List<HintParticleInfo> hints = new LinkedList<>();
@@ -288,9 +350,7 @@ public class ClientProxy extends CommonProxy {
         @Override
         public boolean equals(Object o) {
             if (this == o) return true;
-            if (!(o instanceof HintParticleInfo)) return false;
-
-            HintParticleInfo that = (HintParticleInfo) o;
+            if (!(o instanceof HintParticleInfo that)) return false;
 
             return x == that.x && y == that.y && z == that.z;
         }
@@ -335,26 +395,30 @@ public class ClientProxy extends CommonProxy {
             double X = (x - eyeXint) + 0.25;
             double Y = (y - eyeYint) + 0.25;
             double Z = (z - eyeZint) + 0.25;
+            double worldX = x + 0.25;
+            double worldY = y + 0.25;
+            double worldZ = z + 0.25;
 
-            for (int i = 0; i < 6; i++) {
-                if (icons[i] == null) continue;
+            // cube is a very special model. its facings can be rendered correctly by viewer distance without using
+            // surface normals and view vector
+            // here we do a 2 pass render.
+            // first pass we draw obstructed faces (i.e. faces that are further away from player)
+            // second pass we draw unobstructed faces
+            for (int j = 0; j < 2; j++) {
+                boolean unobstructedPass = j == 1;
+                for (int i = 0; i < 6; i++) {
+                    if (icons[i] == null) continue;
 
-                markTextureUsed(icons[i]);
+                    markTextureUsed(icons[i]);
 
-                double u = icons[i].getMinU();
-                double U = icons[i].getMaxU();
-                double v = icons[i].getMinV();
-                double V = icons[i].getMaxV();
-
-                // cube is a very special model. its facings can be rendered correctly by viewer distance without using
-                // surface normals and view vector
-                // here we do a 2 pass render.
-                // first pass we draw obstructed faces (i.e. faces that are further away from player)
-                // second pass we draw unobstructed faces
-                for (int j = 0; j < 2; j++) {
+                    double u = icons[i].getMinU();
+                    double U = icons[i].getMaxU();
+                    double v = icons[i].getMinV();
+                    double V = icons[i].getMaxV();
                     switch (i) { // {DOWN, UP, NORTH, SOUTH, WEST, EAST}
                         case 0:
-                            if ((Y >= eyeY) != (j == 1)) continue;
+                            // all these ifs is in form if ((is face unobstructed) != (is in unobstructred pass))
+                            if ((worldY >= eyeY) != unobstructedPass) continue;
                             tes.setNormal(0, -1, 0);
                             tes.addVertexWithUV(X, Y, Z + size, u, V);
                             tes.addVertexWithUV(X, Y, Z, u, v);
@@ -364,7 +428,7 @@ public class ClientProxy extends CommonProxy {
                             tes.addVertexWithUV(X, Y, Z + size, u, V);
                             break;
                         case 1:
-                            if ((Y + size <= eyeY) != (j == 1)) continue;
+                            if ((worldY + size <= eyeY) != unobstructedPass) continue;
                             tes.setNormal(0, 1, 0);
                             tes.addVertexWithUV(X, Y + size, Z, u, v);
                             tes.addVertexWithUV(X, Y + size, Z + size, u, V);
@@ -374,7 +438,7 @@ public class ClientProxy extends CommonProxy {
                             tes.addVertexWithUV(X, Y + size, Z, u, v);
                             break;
                         case 2:
-                            if ((Z >= eyeZ) != (j == 1)) continue;
+                            if ((worldZ >= eyeZ) != unobstructedPass) continue;
                             tes.setNormal(0, 0, -1);
                             tes.addVertexWithUV(X, Y, Z, U, V);
                             tes.addVertexWithUV(X, Y + size, Z, U, v);
@@ -384,7 +448,7 @@ public class ClientProxy extends CommonProxy {
                             tes.addVertexWithUV(X, Y, Z, U, V);
                             break;
                         case 3:
-                            if ((Z <= eyeZ) != (j == 1)) continue;
+                            if ((worldZ + size <= eyeZ) != unobstructedPass) continue;
                             tes.setNormal(0, 0, 1);
                             tes.addVertexWithUV(X + size, Y, Z + size, U, V);
                             tes.addVertexWithUV(X + size, Y + size, Z + size, U, v);
@@ -394,7 +458,7 @@ public class ClientProxy extends CommonProxy {
                             tes.addVertexWithUV(X + size, Y, Z + size, U, V);
                             break;
                         case 4:
-                            if ((X >= eyeX) != (j == 1)) continue;
+                            if ((worldX >= eyeX) != unobstructedPass) continue;
                             tes.setNormal(-1, 0, 0);
                             tes.addVertexWithUV(X, Y, Z + size, U, V);
                             tes.addVertexWithUV(X, Y + size, Z + size, U, v);
@@ -404,7 +468,7 @@ public class ClientProxy extends CommonProxy {
                             tes.addVertexWithUV(X, Y, Z + size, U, V);
                             break;
                         case 5:
-                            if ((X + size <= eyeX) != (j == 1)) continue;
+                            if ((worldX + size <= eyeX) != unobstructedPass) continue;
                             tes.setNormal(1, 0, 0);
                             tes.addVertexWithUV(X + size, Y, Z, U, V);
                             tes.addVertexWithUV(X + size, Y + size, Z, U, v);
@@ -429,12 +493,34 @@ public class ClientProxy extends CommonProxy {
 
     public static class FMLEventHandler {
 
+        static boolean connected = false;
+        static boolean configSent = false;
+
         private void resetPlayerLocation() {
             lastPlayerPos.xCoord = Minecraft.getMinecraft().thePlayer.posX;
             lastPlayerPos.yCoord = Minecraft.getMinecraft().thePlayer.posY;
             lastPlayerPos.zCoord = Minecraft.getMinecraft().thePlayer.posZ;
         }
 
+        @SubscribeEvent
+        public void onPlayerLogIn(FMLNetworkEvent.ClientConnectedToServerEvent e) {
+            connected = true;
+            configSent = false;
+        }
+
+        @SubscribeEvent
+        public void onPlayerLogOut(FMLNetworkEvent.ClientDisconnectionFromServerEvent e) {
+            connected = false;
+        }
+
+        @SubscribeEvent(priority = EventPriority.LOWEST)
+        public void onConfigChange(ConfigChangedEvent.PostConfigChangedEvent e) {
+            if (connected && e.modID.equals(StructureLibAPI.MOD_ID)) {
+                configSent = false;
+                sendRegistryOrderToServer();
+            }
+        }
+
         @SubscribeEvent
         public void onClientTick(ClientTickEvent e) {
             if (e.phase == Phase.END && Minecraft.getMinecraft().thePlayer != null) {
@@ -478,6 +564,42 @@ public class ClientProxy extends CommonProxy {
 
     public static class ForgeEventHandler {
 
+        @SubscribeEvent
+        @SideOnly(Side.CLIENT)
+        public void onMouseEvent(MouseEvent event) {
+            final EntityPlayer player = Minecraft.getMinecraft().thePlayer;
+
+            if (player == null || player.isDead) {
+                return;
+            }
+
+            final ItemStack heldItem = player.getHeldItem();
+
+            if (heldItem == null || !(heldItem.getItem() instanceof ItemConstructableTrigger)) return;
+
+            if (event.button != 2 || !event.buttonstate) return;
+
+            // Sink the middle click as soon as a projector is held, so vanilla pick block does not run
+            event.setCanceled(true);
+
+            final boolean isSneaking = player.isSneaking();
+            if (isSneaking && !ChannelWipeConfirmation.confirm(player)) return;
+
+            ChannelPickHandler.handleWorldPick(
+                    player.worldObj,
+                    player,
+                    heldItem,
+                    Minecraft.getMinecraft().objectMouseOver,
+                    isSneaking);
+        }
+
+        @SubscribeEvent
+        public void onEntityJoinWorld(EntityJoinWorldEvent e) {
+            if (e.world.isRemote && e.entity instanceof EntityClientPlayerMP) {
+                sendRegistryOrderToServer();
+            }
+        }
+
         @SubscribeEvent
         public void onWorldLoad(WorldEvent.Load e) {
             if (e.world.isRemote) {
@@ -550,7 +672,6 @@ public class ClientProxy extends CommonProxy {
                     tes.draw();
                     tes.startDrawing(GL11.GL_TRIANGLES);
                 }
-                // TODO verify if we need to add eyeHeight
                 hint.draw(tes, d0, d1, d2, i0, i1, i2);
             }
             p.endStartSection("Draw");

src/main/java/com/gtnewhorizon/structurelib/CommonProxy.java

@@ -12,13 +12,24 @@ import net.minecraft.server.MinecraftServer;
 import net.minecraft.util.IChatComponent;
 import net.minecraft.util.IIcon;
 import net.minecraft.world.World;
+import net.minecraftforge.common.MinecraftForge;
 
 import com.gtnewhorizon.structurelib.net.ErrorHintParticleMessage;
 import com.gtnewhorizon.structurelib.net.UpdateHintParticleMessage;
+
+import cpw.mods.fml.common.event.FMLInitializationEvent;
+import cpw.mods.fml.common.event.FMLLoadCompleteEvent;
 import cpw.mods.fml.common.event.FMLPreInitializationEvent;
+import cpw.mods.fml.common.eventhandler.SubscribeEvent;
+import cpw.mods.fml.common.gameevent.TickEvent;
 
 public class CommonProxy {
 
+    public CommonProxy() {
+        super();
+        MinecraftForge.EVENT_BUS.register(new ForgeEventHandler());
+    }
+
     public void hintParticleTinted(World w, int x, int y, int z, IIcon[] icons, short[] RGBa) {}
 
     public void hintParticleTinted(World w, int x, int y, int z, Block block, int meta, short[] RGBa) {}
@@ -54,6 +65,8 @@ public class CommonProxy {
 
     public void preInit(FMLPreInitializationEvent e) {}
 
+    public void init(FMLInitializationEvent e) {}
+
     public long getOverworldTime() {
         return MinecraftServer.getServer().getEntityWorld().getTotalWorldTime();
     }
@@ -69,6 +82,10 @@ public class CommonProxy {
         }
     }
 
+    public void loadComplete(FMLLoadCompleteEvent e) {
+        ConfigurationHandler.INSTANCE.loadRegistryOrder();
+    }
+
     private final Map<EntityPlayerMP, Map<Object, Long>> throttleMap = new WeakHashMap<>();
 
     public void addThrottledChat(Object throttleKey, EntityPlayer player, IChatComponent text, short intervalRequired,
@@ -93,4 +110,22 @@ public class CommonProxy {
             if (!forceUpdateLastSend) submap.put(throttleKey, now);
         }
     }
+
+    public void displayConfigGUI(String category) {}
+
+    public static class ForgeEventHandler {
+
+        private int ticksSinceLastPurge;
+
+        @SubscribeEvent
+        public void onServerTickEnd(TickEvent.ServerTickEvent e) {
+            if (e.phase != TickEvent.Phase.END) return;
+            if (++ticksSinceLastPurge < 20 * 60 * 10) return;
+            ticksSinceLastPurge = 0;
+            MinecraftServer server = MinecraftServer.getServer();
+            // it's hard to tell why server could be null in a server tick handler, but who knows?
+            if (server == null) return;
+            SortedRegistry.cleanup(server);
+        }
+    }
 }

src/main/java/com/gtnewhorizon/structurelib/ConfigurationHandler.java

@@ -1,15 +1,26 @@
 package com.gtnewhorizon.structurelib;
 
 import java.io.File;
+import java.lang.ref.WeakReference;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.HashMap;
+import java.util.List;
 import java.util.Map;
 
 import net.minecraftforge.common.config.ConfigCategory;
 import net.minecraftforge.common.config.Configuration;
 import net.minecraftforge.common.config.Property;
 
+import org.apache.commons.lang3.tuple.Pair;
+
+import com.google.common.collect.Iterables;
+import com.google.common.collect.Lists;
+
 import cpw.mods.fml.client.event.ConfigChangedEvent;
 import cpw.mods.fml.common.FMLCommonHandler;
 import cpw.mods.fml.common.eventhandler.SubscribeEvent;
+import cpw.mods.fml.relauncher.FMLLaunchHandler;
 
 public enum ConfigurationHandler {
 
@@ -22,6 +33,7 @@ public enum ConfigurationHandler {
     private int hintTransparency;
     private int autoPlaceBudget;
     private int autoPlaceInterval;
+    private Map<String, Pair<List<String>, List<String>>> registryOrders;
 
     ConfigurationHandler() {
         FMLCommonHandler.instance().bus().register(this);
@@ -86,8 +98,50 @@ public enum ConfigurationHandler {
                         + "Note this relates to the wall clock, not in game ticks.\n"
                         + "Value smaller than default is likely to be perceived as no minimal interval whatsoever.");
 
+        loadRegistryOrder();
+
+        saveConfig();
+    }
+
+    void loadRegistryOrder() {
+        loadRegistryOrderImpl();
+        setLanguageKeys();
+        saveConfig();
+    }
+
+    private void loadRegistryOrderImpl() {
+        registryOrders = new HashMap<>();
+        for (Map.Entry<String, WeakReference<SortedRegistry<?>>> e : SortedRegistry.ALL_REGISTRIES.entrySet()) {
+            SortedRegistry<?> r = e.getValue().get();
+            if (r == null) continue;
+            String category = "registries." + e.getKey();
+            if (FMLLaunchHandler.side().isClient()) {
+                // only meaningful on client, and would crash on server
+                config.setCategoryConfigEntryClass(category, RegistryOrderEntry.class);
+            }
+            Property pOrder = config.get(
+                    category,
+                    "ordering",
+                    Iterables.toArray(r.getCurrentOrdering(), String.class),
+                    "stuff not in this list will be automatically available after all entries listed here in their natural order, unless explicitly disabled in disabled config below.");
+            Property pDisable = config.get(category, "disabled", new String[0], "stuff in this list will be disabled");
+            List<String> all = Lists.newArrayList(r.getCurrentOrdering());
+            List<String> curVal = new ArrayList<>(Arrays.asList(pOrder.getStringList()));
+            List<String> disabled = new ArrayList<>(Arrays.asList(pDisable.getStringList()));
+            curVal.removeAll(disabled);
+            all.removeAll(disabled);
+            curVal.removeIf(s -> !all.remove(s));
+            curVal.addAll(all);
+            pOrder.set(curVal.toArray(new String[0]));
+            registryOrders.put(e.getKey(), Pair.of(curVal, disabled));
+        }
+        saveConfig();
+    }
+
+    private void saveConfig() {
         if (config.hasChanged()) {
             config.save();
+            config.load();
         }
     }
 
@@ -122,7 +176,12 @@ public enum ConfigurationHandler {
         return autoPlaceInterval;
     }
 
+    public Pair<List<String>, List<String>> getRegistryOrder(String name) {
+        return registryOrders.get(name);
+    }
+
     Configuration getConfig() {
         return config;
     }
+
 }

src/main/java/com/gtnewhorizon/structurelib/DevelopHelper.java

@@ -0,0 +1,48 @@
+package com.gtnewhorizon.structurelib;
+
+import net.minecraft.init.Blocks;
+import net.minecraft.item.ItemStack;
+import net.minecraft.nbt.NBTTagCompound;
+import net.minecraft.nbt.NBTTagList;
+
+import cpw.mods.fml.common.event.FMLInterModComms;
+
+public class DevelopHelper {
+
+    private static final boolean DEBUG = Boolean.getBoolean("structurelib.develop_helper");
+
+    public static void onPreInit() {
+        if (!DEBUG) return;
+        StructureLib.LOGGER.info("Running develop helper");
+        StructureLibAPI.registerChannelDescription("sandstone", StructureLibAPI.MOD_ID, "variants of Sandstone");
+        StructureLibAPI.registerChannelItem("sandstone", StructureLibAPI.MOD_ID, 1, new ItemStack(Blocks.sandstone));
+        StructureLibAPI
+                .registerChannelItem("sandstone", StructureLibAPI.MOD_ID, 2, new ItemStack(Blocks.sandstone, 1, 1));
+        StructureLibAPI
+                .registerChannelItem("sandstone", StructureLibAPI.MOD_ID, 3, new ItemStack(Blocks.sandstone, 1, 2));
+        StructureLibAPI.registerChannelDescription("sandbricks", StructureLibAPI.MOD_ID, "variants of Sandbricks");
+        StructureLibAPI.registerChannelDescription("apple", StructureLibAPI.MOD_ID, "apple");
+        StructureLibAPI.registerChannelDescription("bright", StructureLibAPI.MOD_ID, "bright");
+        StructureLibAPI.registerChannelDescription("apple_blight", StructureLibAPI.MOD_ID, "apple_blight");
+        StructureLibAPI.registerChannelDescription("app_eagle", StructureLibAPI.MOD_ID, "app_eagle");
+    }
+
+    public void x() {
+        NBTTagCompound command = new NBTTagCompound();
+        NBTTagList items = new NBTTagList();
+        int[] metas = { 0, 1, 2 };
+        for (int meta : metas) {
+            NBTTagCompound tag = new NBTTagCompound();
+            tag.setTag("Item", new ItemStack(Blocks.sandstone, 1, meta).writeToNBT(new NBTTagCompound()));
+            NBTTagList channels = new NBTTagList();
+            NBTTagCompound channel = new NBTTagCompound();
+            channel.setString("Channel", "sandstone");
+            channel.setInteger("Value", meta + 1);
+            channels.appendTag(channel);
+            tag.setTag("Channels", channels);
+            items.appendTag(tag);
+        }
+        command.setTag("Items", items);
+        FMLInterModComms.sendMessage("structurelib", "register_channel_item", command);
+    }
+}

src/main/java/com/gtnewhorizon/structurelib/GuiEditRegistryConfig.java

@@ -0,0 +1,695 @@
+/*
+ * Forge Mod Loader Copyright (c) 2012-2014 cpw. All rights reserved. This program and the accompanying materials are
+ * made available under the terms of the GNU Lesser Public License v2.1 which accompanies this distribution, and is
+ * available at http://www.gnu.org/licenses/old-licenses/gpl-2.0.html Contributors (this class): bspkrs - implementation
+ */
+
+package com.gtnewhorizon.structurelib;
+
+import static cpw.mods.fml.client.config.GuiUtils.RESET_CHAR;
+import static cpw.mods.fml.client.config.GuiUtils.UNDO_CHAR;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.List;
+import java.util.WeakHashMap;
+
+import net.minecraft.client.Minecraft;
+import net.minecraft.client.gui.FontRenderer;
+import net.minecraft.client.gui.GuiButton;
+import net.minecraft.client.gui.GuiListExtended;
+import net.minecraft.client.gui.GuiScreen;
+import net.minecraft.client.gui.ScaledResolution;
+import net.minecraft.client.renderer.OpenGlHelper;
+import net.minecraft.client.renderer.Tessellator;
+import net.minecraft.client.resources.I18n;
+import net.minecraft.util.EnumChatFormatting;
+import net.minecraft.util.MathHelper;
+import net.minecraft.util.ResourceLocation;
+
+import org.lwjgl.input.Keyboard;
+import org.lwjgl.opengl.GL11;
+
+import cpw.mods.fml.client.config.GuiButtonExt;
+import cpw.mods.fml.client.config.GuiConfig;
+import cpw.mods.fml.client.config.GuiUnicodeGlyphButton;
+import cpw.mods.fml.client.config.GuiUtils;
+import cpw.mods.fml.client.config.HoverChecker;
+import cpw.mods.fml.client.config.IConfigElement;
+import cpw.mods.fml.client.event.ConfigChangedEvent;
+import cpw.mods.fml.client.event.ConfigChangedEvent.OnConfigChangedEvent;
+import cpw.mods.fml.client.event.ConfigChangedEvent.PostConfigChangedEvent;
+import cpw.mods.fml.common.FMLCommonHandler;
+import cpw.mods.fml.common.Loader;
+import cpw.mods.fml.common.eventhandler.Event.Result;
+
+/**
+ * This class is the base GuiScreen for all config GUI screens. It can be extended by mods to provide the top-level
+ * config screen that will be called when the Config button is clicked from the Main Menu Mods list.
+ *
+ * @author bspkrs
+ */
+public class GuiEditRegistryConfig extends GuiScreen {
+
+    public static final String OMITTED = "..";
+    public static final int LIST_WINDOW_PADDING = 20;
+    public static final int MID_SECTION_WIDTH = 10;
+    /**
+     * A reference to the screen object that created this. Used for navigating between screens.
+     */
+    public final GuiScreen parentScreen;
+    private final IConfigElement<String> disabledElement;
+    private final String[] beforeDisabledValue;
+    private final IConfigElement<String> orderElement;
+    private final String[] beforeOrderValue;
+    final Collection<EntriesList> lists;
+    private final String registryName;
+    EntriesList disabledEntries;
+    EntriesList orderEntries;
+    public String title = "Config GUI";
+    public String titleLine2;
+    private GuiButtonExt btnDefault;
+    private GuiButtonExt btnUndoAll;
+    public final String modID;
+    /**
+     * When set to a non-null value the OnConfigChanged and PostConfigChanged events will be posted when the Done button
+     * is pressed if any configElements were changed (includes child screens). If not defined, the events will be posted
+     * if the parent gui is null or if the parent gui is not an instance of GuiConfig.
+     */
+    public final String configID;
+    public final boolean isWorldRunning;
+    public final boolean allRequireWorldRestart;
+    public final boolean allRequireMcRestart;
+    public boolean needsRefresh = true;
+    private HoverChecker undoHoverChecker;
+    private HoverChecker resetHoverChecker;
+
+    @SuppressWarnings({ "rawtypes", "unchecked" })
+    public GuiEditRegistryConfig(GuiScreen parentScreen, IConfigElement disabled, IConfigElement order,
+            String registryName, String modID, String configID, boolean allRequireWorldRestart,
+            boolean allRequireMcRestart, String title, String titleLine2) {
+        this.mc = parentScreen.mc;
+        this.lists = Collections.newSetFromMap(new WeakHashMap<>());
+        this.disabledElement = disabled;
+        this.beforeDisabledValue = (String[]) this.disabledElement.getList();
+        this.orderElement = order;
+        this.beforeOrderValue = (String[]) this.orderElement.getList();
+        this.parentScreen = parentScreen;
+        this.allRequireWorldRestart = allRequireWorldRestart;
+        this.allRequireMcRestart = allRequireMcRestart;
+        this.registryName = registryName;
+        this.modID = modID;
+        this.configID = configID;
+        this.isWorldRunning = mc.theWorld != null;
+        if (title != null) this.title = title;
+        this.titleLine2 = titleLine2;
+        if (this.titleLine2 != null && this.titleLine2.startsWith(" > "))
+            this.titleLine2 = this.titleLine2.replaceFirst(" > ", "");
+    }
+
+    /**
+     * Adds the buttons (and other controls) to the screen in question.
+     */
+    @Override
+    public void initGui() {
+        Keyboard.enableRepeatEvents(true);
+        if (this.disabledEntries == null || this.needsRefresh) {
+            this.disabledEntries = new EntriesList(
+                    (width - MID_SECTION_WIDTH) / 2 - LIST_WINDOW_PADDING,
+                    LIST_WINDOW_PADDING,
+                    I18n.format("structurelib.configgui.disabled"));
+            this.disabledEntries.initEntries(Arrays.asList(disabledElement.getList()));
+        } else {
+            this.disabledEntries.reinit((width - MID_SECTION_WIDTH) / 2 - LIST_WINDOW_PADDING, LIST_WINDOW_PADDING);
+        }
+        if (this.orderEntries == null || this.needsRefresh) {
+            this.orderEntries = new EntriesList(
+                    (width - MID_SECTION_WIDTH) / 2 - LIST_WINDOW_PADDING,
+                    (width + MID_SECTION_WIDTH) / 2,
+                    I18n.format("structurelib.configgui.enabled"));
+            this.orderEntries.initEntries(Arrays.asList(orderElement.getList()));
+        } else {
+            this.orderEntries
+                    .reinit((width - MID_SECTION_WIDTH) / 2 - LIST_WINDOW_PADDING, (width + MID_SECTION_WIDTH) / 2);
+        }
+        this.needsRefresh = false;
+
+        int undoGlyphWidth = mc.fontRenderer.getStringWidth(UNDO_CHAR) * 2;
+        int resetGlyphWidth = mc.fontRenderer.getStringWidth(RESET_CHAR) * 2;
+        int doneWidth = Math.max(mc.fontRenderer.getStringWidth(I18n.format("gui.done")) + 20, 100);
+        int undoWidth = mc.fontRenderer.getStringWidth(" " + I18n.format("fml.configgui.tooltip.undoChanges"))
+                + undoGlyphWidth
+                + 20;
+        int resetWidth = mc.fontRenderer.getStringWidth(" " + I18n.format("fml.configgui.tooltip.resetToDefault"))
+                + resetGlyphWidth
+                + 20;
+        int buttonWidthHalf = (doneWidth + 5 + undoWidth + 5 + resetWidth + 5) / 2;
+        this.buttonList.add(
+                new GuiButtonExt(
+                        2000,
+                        this.width / 2 - buttonWidthHalf,
+                        this.height - 29,
+                        doneWidth,
+                        20,
+                        I18n.format("gui.done")));
+        this.buttonList.add(
+                this.btnDefault = new GuiUnicodeGlyphButton(
+                        2001,
+                        this.width / 2 - buttonWidthHalf + doneWidth + 5 + undoWidth + 5,
+                        this.height - 29,
+                        resetWidth,
+                        20,
+                        " " + I18n.format("fml.configgui.tooltip.resetToDefault"),
+                        RESET_CHAR,
+                        2.0F));
+        this.buttonList.add(
+                btnUndoAll = new GuiUnicodeGlyphButton(
+                        2002,
+                        this.width / 2 - buttonWidthHalf + doneWidth + 5,
+                        this.height - 29,
+                        undoWidth,
+                        20,
+                        " " + I18n.format("fml.configgui.tooltip.undoChanges"),
+                        UNDO_CHAR,
+                        2.0F));
+
+        this.undoHoverChecker = new HoverChecker(this.btnUndoAll, 800);
+        this.resetHoverChecker = new HoverChecker(this.btnDefault, 800);
+    }
+
+    /**
+     * Called when the screen is unloaded. Used to disable keyboard repeat events
+     */
+    @Override
+    public void onGuiClosed() {
+        if (this.configID != null && this.parentScreen instanceof GuiConfig parentGuiConfig) {
+            parentGuiConfig.needsRefresh = true;
+            parentGuiConfig.initGui();
+        }
+
+        if (!(this.parentScreen instanceof GuiConfig)) Keyboard.enableRepeatEvents(false);
+    }
+
+    public boolean saveConfigElements() {
+        if (isChanged()) {
+            disabledElement.set(disabledEntries.entries.stream().map(e -> e.name).toArray(String[]::new));
+            orderElement.set(orderEntries.entries.stream().map(e -> e.name).toArray(String[]::new));
+        }
+        return false;
+    }
+
+    @Override
+    protected void actionPerformed(GuiButton button) {
+        if (button.id == 2000) {
+            try {
+                if ((configID != null || this.parentScreen == null || !(this.parentScreen instanceof GuiConfig))
+                        && isChanged()) {
+                    saveConfigElements();
+                    if (Loader.isModLoaded(modID)) {
+                        ConfigChangedEvent event = new OnConfigChangedEvent(modID, configID, isWorldRunning, false);
+                        FMLCommonHandler.instance().bus().post(event);
+                        if (!event.getResult().equals(Result.DENY)) FMLCommonHandler.instance().bus()
+                                .post(new PostConfigChangedEvent(modID, configID, isWorldRunning, false));
+
+                        if (this.parentScreen instanceof GuiConfig) ((GuiConfig) this.parentScreen).needsRefresh = true;
+                    }
+                }
+            } catch (Throwable e) {
+                e.printStackTrace();
+            }
+
+            this.mc.displayGuiScreen(this.parentScreen);
+        } else if (button.id == 2001) {
+            setToDefault();
+        } else if (button.id == 2002) {
+            undoChanges();
+        }
+    }
+
+    public boolean isInitialized() {
+        return disabledEntries != null && orderEntries != null;
+    }
+
+    public void undoChanges() {
+        disabledEntries.initEntries(Arrays.asList(beforeDisabledValue));
+        orderEntries.initEntries(Arrays.asList(beforeOrderValue));
+    }
+
+    public void setToDefault() {
+        disabledEntries.initEntries(Arrays.asList(disabledElement.getList()));
+        orderEntries.initEntries(Arrays.asList(orderElement.getList()));
+    }
+
+    public boolean isDefault() {
+        return !orderEntries.areContentEqual(orderElement.getDefaults())
+                || !disabledEntries.areContentEqual(disabledElement.getDefaults());
+    }
+
+    public boolean isChanged() {
+        return !orderEntries.areContentEqual(beforeOrderValue) || !disabledEntries.areContentEqual(beforeDisabledValue);
+    }
+
+    /**
+     * Called when the mouse is clicked.
+     */
+    @Override
+    protected void mouseClicked(int x, int y, int mouseEvent) {
+        if (mouseEvent != 0 || !this.disabledEntries.func_148179_a(x, y, mouseEvent)
+                && !this.orderEntries.func_148179_a(x, y, mouseEvent)) {
+            super.mouseClicked(x, y, mouseEvent);
+        }
+    }
+
+    /**
+     * Called when the mouse is moved or a mouse button is released. Signature: (mouseX, mouseY, which) which==-1 is
+     * mouseMove, which==0 or which==1 is mouseUp
+     */
+    @Override
+    protected void mouseMovedOrUp(int x, int y, int mouseEvent) {
+        if (mouseEvent != 0 || !this.disabledEntries.func_148181_b(x, y, mouseEvent)
+                && !this.orderEntries.func_148181_b(x, y, mouseEvent)) {
+            super.mouseMovedOrUp(x, y, mouseEvent);
+        }
+    }
+
+    /**
+     * Fired when a key is typed. This is the equivalent of KeyListener.keyTyped(KeyEvent e).
+     */
+    @Override
+    protected void keyTyped(char eventChar, int eventKey) {
+        if (eventKey == Keyboard.KEY_ESCAPE) this.mc.displayGuiScreen(parentScreen);
+    }
+
+    String trimStringToWidth(String str, int width) {
+        int strwidth = mc.fontRenderer.getStringWidth(str);
+        int elipsisWidth = mc.fontRenderer.getStringWidth(OMITTED);
+        if (strwidth > width - elipsisWidth && elipsisWidth > strwidth) {
+            return mc.fontRenderer.trimStringToWidth(str, width - elipsisWidth).trim() + OMITTED;
+        }
+        return str;
+    }
+
+    /**
+     * Draws the screen and all the components in it.
+     */
+    @Override
+    public void drawScreen(int mouseX, int mouseY, float partialTicks) {
+        for (EntriesList list : lists) {
+            list.handleDrag(mouseX, mouseY, partialTicks);
+        }
+        this.drawDefaultBackground();
+        for (EntriesList list : lists) {
+            list.drawScreen(mouseX, mouseY, partialTicks);
+        }
+        this.drawCenteredString(this.fontRendererObj, this.title, this.width / 2, 8, 16777215);
+        String title2 = this.titleLine2;
+
+        if (title2 != null) {
+            title2 = trimStringToWidth(title2, width - 6);
+            this.drawCenteredString(this.fontRendererObj, title2, this.width / 2, 18, 16777215);
+        }
+
+        this.btnUndoAll.enabled = isChanged();
+        this.btnDefault.enabled = isDefault();
+        super.drawScreen(mouseX, mouseY, partialTicks);
+        for (EntriesList list : lists) {
+            list.drawScreenPost(mouseX, mouseY, partialTicks);
+        }
+        if (this.undoHoverChecker.checkHover(mouseX, mouseY)) this.func_146283_a(
+                this.mc.fontRenderer.listFormattedStringToWidth(I18n.format("fml.configgui.tooltip.undoAll"), 300),
+                mouseX,
+                mouseY);
+        if (this.resetHoverChecker.checkHover(mouseX, mouseY)) this.func_146283_a(
+                this.mc.fontRenderer.listFormattedStringToWidth(I18n.format("fml.configgui.tooltip.resetAll"), 300),
+                mouseX,
+                mouseY);
+    }
+
+    private class EntriesList extends GuiListExtended {
+
+        final String heading;
+        final List<ListEntry> entries = new ArrayList<>();
+        int controlX;
+
+        public EntriesList(int width, int left, String heading) {
+            super(
+                    mc,
+                    width,
+                    GuiEditRegistryConfig.this.height,
+                    titleLine2 != null ? 33 : 23,
+                    GuiEditRegistryConfig.this.height - 32,
+                    20);
+            this.heading = heading;
+            if (heading != null) {
+                setHasListHeader(true, mc.fontRenderer.FONT_HEIGHT + 4);
+            }
+            setSlotXBoundsFromLeft(left);
+            this.controlX = this.getScrollBarX() - 20;
+            lists.add(this);
+        }
+
+        @Override
+        public void drawScreen(int p_148128_1_, int p_148128_2_, float p_148128_3_) {
+            GL11.glEnable(GL11.GL_SCISSOR_TEST);
+            ScaledResolution scaledresolution = new ScaledResolution(mc, mc.displayWidth, mc.displayHeight);
+            GL11.glScissor(
+                    (left - 4) * scaledresolution.getScaleFactor(),
+                    (int) ((scaledresolution.getScaledHeight_double() - (bottom + 4))
+                            * scaledresolution.getScaleFactor()),
+                    (width + 8) * scaledresolution.getScaleFactor(),
+                    (height + 8) * scaledresolution.getScaleFactor());
+            super.drawScreen(p_148128_1_, p_148128_2_, p_148128_3_);
+            GL11.glDisable(GL11.GL_SCISSOR_TEST);
+        }
+
+        @Override
+        public void overlayBackground(int p_148136_1_, int p_148136_2_, int p_148136_3_, int p_148136_4_) {}
+
+        @Override
+        protected void drawContainerBackground(Tessellator tessellator) {
+            GL11.glEnable(GL11.GL_BLEND);
+            OpenGlHelper.glBlendFunc(GL11.GL_SRC_ALPHA, GL11.GL_ONE_MINUS_SRC_ALPHA, 0, 1);
+            GL11.glDisable(GL11.GL_ALPHA_TEST);
+            GL11.glShadeModel(GL11.GL_SMOOTH);
+            GL11.glDisable(GL11.GL_TEXTURE_2D);
+            tessellator.startDrawingQuads();
+            tessellator.setColorRGBA_I(0, 64);
+            tessellator.addVertex(left, bottom, 0);
+            tessellator.addVertex(right, bottom, 0);
+            tessellator.addVertex(right, top, 0);
+            tessellator.addVertex(left, top, 0);
+            tessellator.draw();
+            GL11.glEnable(GL11.GL_TEXTURE_2D);
+            GL11.glShadeModel(GL11.GL_FLAT);
+            GL11.glEnable(GL11.GL_ALPHA_TEST);
+            GL11.glDisable(GL11.GL_BLEND);
+        }
+
+        @Override
+        protected void drawListHeader(int p_148129_1_, int p_148129_2_, Tessellator p_148129_3_) {
+            if (heading == null) {
+                return;
+            }
+            FontRenderer fr = mc.fontRenderer;
+            fr.drawString(
+                    this.heading,
+                    p_148129_1_ + this.width / 2 - fr.getStringWidth(this.heading) / 2,
+                    Math.min(this.top + 3, p_148129_2_),
+                    0xffffff);
+        }
+
+        void reinit(int width, int left) {
+            this.width = width;
+            this.bottom = GuiEditRegistryConfig.this.height - 32;
+            this.setSlotXBoundsFromLeft(left);
+            this.controlX = this.getScrollBarX() - 20;
+        }
+
+        void initEntries(Iterable<?> entries) {
+            this.controlX = this.getScrollBarX() - 20;
+            this.entries.clear();
+            for (Object entry : entries) {
+                addEntry(new ListEntry(entry.toString()));
+            }
+        }
+
+        void addEntry(ListEntry entry) {
+            entry.entriesList = this;
+            this.entries.add(entry);
+            this.controlX = Math.min(this.controlX, this.getScrollBarX() - entry.getControlSetWidth() - 2);
+        }
+
+        @Override
+        public IGuiListEntry getListEntry(int i) {
+            return entries.get(i);
+        }
+
+        @Override
+        protected int getSize() {
+            return entries.size();
+        }
+
+        int getLabelX() {
+            return left + 2;
+        }
+
+        int getControlX() {
+            return controlX;
+        }
+
+        @Override
+        public int getListWidth() {
+            return width;
+        }
+
+        @Override
+        protected int getScrollBarX() {
+            return left + getListWidth() - 6;
+        }
+
+        public void handleDrag(int mouseX, int mouseY, float partialTicks) {
+            for (int i = 0, entriesSize = entries.size(); i < entriesSize; i++) {
+                ListEntry entry = entries.get(i);
+                if (entry.handleDrag(i, mouseX, mouseY, partialTicks)) {
+                    return;
+                }
+            }
+        }
+
+        public void drawScreenPost(int mouseX, int mouseY, float partialTicks) {
+            for (ListEntry entry : entries) {
+                entry.drawToolTip(mouseX, mouseY);
+            }
+        }
+
+        public boolean areContentEqual(Object[] vals) {
+            if (vals.length != entries.size()) return false;
+            for (int i = 0; i < entries.size(); i++) {
+                ListEntry entry = entries.get(i);
+                if (!entry.name.equals(vals[i])) return false;
+            }
+            return true;
+        }
+    }
+
+    class ListEntry implements GuiListExtended.IGuiListEntry {
+
+        private EntriesList entriesList;
+        private final HoverChecker hoverCheckerText = new HoverChecker(0, 0, 0, 0, 0);
+        final String name;
+        final String localizedName;
+        private final String tooltip;
+        public boolean modified = false;
+
+        private final GuiButtonExt btnDrag = new GuiButtonDrag(1, 0, 0, 20, 20);
+        private final HoverChecker hoverCheckerBtnDrag = new HoverChecker(btnDrag, 800);
+        private boolean isDragging = false;
+        private long lastScroll = 0;
+
+        ListEntry(String name) {
+            this.name = name;
+            String nameKey = "structurelib.sortedregistry." + registryName + "." + name;
+            this.localizedName = trans(nameKey, name);
+
+            String tooltipKey = nameKey + ".tooltip";
+            String tooltip = trans(tooltipKey, null);
+            StringBuilder tooltipBuilder = new StringBuilder();
+            tooltipBuilder.append(EnumChatFormatting.GREEN);
+            tooltipBuilder.append(this.localizedName);
+            if (tooltip != null) {
+                tooltipBuilder.append('\n').append(EnumChatFormatting.YELLOW).append(tooltip);
+            }
+            tooltipBuilder.append('\n');
+            tooltipBuilder.append(EnumChatFormatting.DARK_GRAY);
+            tooltipBuilder.append(this.name);
+            this.tooltip = tooltipBuilder.toString();
+        }
+
+        @Override
+        public void drawEntry(int slotIndex, int x, int y, int listWidth, int slotHeight, Tessellator tessellator,
+                int mouseX, int mouseY, boolean isSelected) {
+            drawOutlineBox(x, y, listWidth, slotHeight, tessellator);
+            drawLabel(y, slotHeight);
+            drawControlSet(y, slotHeight, mouseX, mouseY);
+        }
+
+        private void drawOutlineBox(int x, int y, int listWidth, int slotHeight, Tessellator tessellator) {
+            if (isDragging) {
+                // left x, right x, top y, bottom y
+                int lx = x, rx = entriesList.getScrollBarX() - 4, ty = y, by = y + slotHeight;
+                GL11.glColor4f(1.0F, 1.0F, 1.0F, 1.0F);
+                GL11.glDisable(GL11.GL_TEXTURE_2D);
+                tessellator.startDrawingQuads();
+                tessellator.setColorOpaque_I(0x808080);
+                tessellator.addVertexWithUV(lx - 4, by + 4, 0.0D, 0.0D, 1.0D);
+                tessellator.addVertexWithUV(rx + 4, by + 4, 0.0D, 1.0D, 1.0D);
+                tessellator.addVertexWithUV(rx + 4, ty - 4, 0.0D, 1.0D, 0.0D);
+                tessellator.addVertexWithUV(lx - 4, ty - 4, 0.0D, 0.0D, 0.0D);
+                tessellator.setColorOpaque_I(0x202020);
+                tessellator.addVertexWithUV(lx - 2, by + 2, 0.0D, 0.0D, 1.0D);
+                tessellator.addVertexWithUV(rx + 2, by + 2, 0.0D, 1.0D, 1.0D);
+                tessellator.addVertexWithUV(rx + 2, ty - 2, 0.0D, 1.0D, 0.0D);
+                tessellator.addVertexWithUV(lx - 2, ty - 2, 0.0D, 0.0D, 0.0D);
+                tessellator.draw();
+                GL11.glEnable(GL11.GL_TEXTURE_2D);
+            }
+        }
+
+        private void drawControlSet(int y, int slotHeight, int mouseX, int mouseY) {
+            btnDrag.xPosition = entriesList.getControlX();
+            btnDrag.yPosition = y + (slotHeight - btnDrag.height) / 2;
+            btnDrag.drawButton(mc, mouseX, mouseY);
+        }
+
+        private void drawLabel(int y, int slotHeight) {
+            String label = modified ? EnumChatFormatting.ITALIC + localizedName : localizedName;
+            int allowedWidth = entriesList.getControlX() - entriesList.getLabelX() - 4;
+            // probably not very wise to recompute this every render tick, but it doesn't matter for now
+            String toDraw = trimStringToWidth(label, allowedWidth);
+            hoverCheckerText.updateBounds(
+                    y + slotHeight / 2 - mc.fontRenderer.FONT_HEIGHT / 2,
+                    y + slotHeight / 2 + mc.fontRenderer.FONT_HEIGHT / 2,
+                    entriesList.getLabelX(),
+                    entriesList.getLabelX() + mc.fontRenderer.getStringWidth(toDraw));
+
+            mc.fontRenderer.drawString(
+                    toDraw,
+                    entriesList.getLabelX(),
+                    y + slotHeight / 2 - mc.fontRenderer.FONT_HEIGHT / 2,
+                    getLabelColor());
+        }
+
+        void drawToolTip(int mouseX, int mouseY) {
+            // ensure checkHover() is always called, or the hover threshold might fail under certain corner cases
+            if (hoverCheckerText.checkHover(mouseX, mouseY)) {
+                GuiEditRegistryConfig.this.func_146283_a(
+                        mc.fontRenderer.listFormattedStringToWidth(tooltip, entriesList.getListWidth()),
+                        mouseX,
+                        mouseY);
+            }
+            if (hoverCheckerBtnDrag.checkHover(mouseX, mouseY) && !isDragging) {
+                GuiEditRegistryConfig.this.func_146283_a(
+                        mc.fontRenderer.listFormattedStringToWidth(
+                                I18n.format("structurelib.configgui.drag.tooltip"),
+                                entriesList.getListWidth()),
+                        mouseX,
+                        mouseY);
+            }
+        }
+
+        protected int getLabelColor() {
+            return isDragging ? 0x888888 : 0xffffff;
+        }
+
+        int getControlSetWidth() {
+            return this.btnDrag.getButtonWidth();
+        }
+
+        public boolean handleDrag(int index, int mouseX, int mouseY, float partialTicks) {
+            if (!isDragging) {
+                return false;
+            }
+            for (EntriesList list : lists) {
+                if (list == entriesList) continue;
+                if (mouseX > list.left && mouseX < list.right && mouseY > list.top && mouseY < list.bottom) {
+                    int l;
+                    if (list.entries.isEmpty()) l = 0;
+                    else l = list.func_148124_c(mouseX, mouseY);
+                    if (l < 0) {
+                        if (mouseY < (list.bottom + list.top) / 2) {
+                            l = 0;
+                        } else {
+                            l = list.entries.size();
+                        }
+                    }
+                    entriesList.func_148143_b(true);
+                    entriesList.entries.remove(index);
+                    list.func_148143_b(false);
+                    list.entries.add(l, this);
+                    this.entriesList = list;
+                    return true;
+                }
+            }
+            long now = System.currentTimeMillis();
+            if (now - lastScroll > 20) {
+                if (mouseY < entriesList.top) {
+                    entriesList.scrollBy(-3);
+                    lastScroll = now;
+                } else if (mouseY > entriesList.bottom) {
+                    entriesList.scrollBy(3);
+                    lastScroll = now;
+                }
+            }
+            int l = entriesList.func_148124_c(
+                    MathHelper.clamp_int(mouseX, entriesList.left, entriesList.right),
+                    MathHelper.clamp_int(mouseY, entriesList.top, entriesList.bottom));
+            if (l < 0 || l == index) return true;
+            entriesList.entries.remove(index);
+            entriesList.entries.add(l, this);
+            return true;
+        }
+
+        @Override
+        public void mouseReleased(int index, int x, int y, int mouseEvent, int relativeX, int relativeY) {
+            isDragging = false;
+        }
+
+        @Override
+        public boolean mousePressed(int index, int x, int y, int mouseEvent, int relativeX, int relativeY) {
+            if (btnDrag.mousePressed(mc, x, y)) {
+                isDragging = true;
+                return true;
+            }
+            return false;
+        }
+    }
+
+    private static String trans(String transKey, String fallback) {
+        String translated = I18n.format(transKey);
+        return translated.equals(transKey) ? fallback : translated;
+    }
+
+    private static class GuiButtonDrag extends GuiButtonExt {
+
+        public GuiButtonDrag(int id, int xPos, int yPos, int width, int height) {
+            super(id, xPos, yPos, width, height, null);
+        }
+
+        @Override
+        public void drawButton(Minecraft mc, int mouseX, int mouseY) {
+            if (this.visible) {
+                this.field_146123_n = mouseX >= this.xPosition && mouseY >= this.yPosition
+                        && mouseX < this.xPosition + this.width
+                        && mouseY < this.yPosition + this.height;
+                int k = this.getHoverState(this.field_146123_n);
+                GuiUtils.drawContinuousTexturedBox(
+                        buttonTextures,
+                        this.xPosition,
+                        this.yPosition,
+                        0,
+                        46 + k * 20,
+                        this.width,
+                        this.height,
+                        200,
+                        20,
+                        2,
+                        3,
+                        2,
+                        2,
+                        this.zLevel);
+                mc.renderEngine.bindTexture(new ResourceLocation("structurelib", "textures/gui/fourwayarrow2.png"));
+                int x = this.xPosition + (this.width - 12) / 2;
+                int y = this.yPosition + (this.height - 12) / 2;
+                Tessellator tessellator = Tessellator.instance;
+                tessellator.startDrawingQuads();
+                tessellator.addVertexWithUV(x, y + 12, zLevel, 0, 1);
+                tessellator.addVertexWithUV(x + 12, y + 12, zLevel, 1, 1);
+                tessellator.addVertexWithUV(x + 12, y, zLevel, 1, 0);
+                tessellator.addVertexWithUV(x, y, zLevel, 0, 0);
+                tessellator.draw();
+            }
+        }
+    }
+}

src/main/java/com/gtnewhorizon/structurelib/GuiHandler.java

@@ -3,21 +3,28 @@ package com.gtnewhorizon.structurelib;
 import net.minecraft.entity.player.EntityPlayer;
 import net.minecraft.world.World;
 
+import com.gtnewhorizon.structurelib.gui.EmptyContainer;
 import com.gtnewhorizon.structurelib.gui.GuiScreenConfigureChannels;
+
 import cpw.mods.fml.common.network.IGuiHandler;
 
 public class GuiHandler implements IGuiHandler {
 
     @Override
     public Object getServerGuiElement(int ID, EntityPlayer player, World world, int x, int y, int z) {
-        return null;
+        switch (ID) {
+            case 0:
+                return new EmptyContainer(player);
+            default:
+                return null;
+        }
     }
 
     @Override
     public Object getClientGuiElement(int ID, EntityPlayer player, World world, int x, int y, int z) {
         switch (ID) {
             case 0:
-                return new GuiScreenConfigureChannels(player.inventory.getStackInSlot(x));
+                return new GuiScreenConfigureChannels(new EmptyContainer(player), player.inventory.getStackInSlot(x));
             default:
                 return null;
         }

src/main/java/com/gtnewhorizon/structurelib/RegistryOrderEntry.java

@@ -0,0 +1,77 @@
+package com.gtnewhorizon.structurelib;
+
+import java.util.List;
+
+import net.minecraft.client.gui.GuiScreen;
+
+import cpw.mods.fml.client.config.GuiConfig;
+import cpw.mods.fml.client.config.GuiConfigEntries;
+import cpw.mods.fml.client.config.IConfigElement;
+
+@SuppressWarnings({ "unchecked" })
+public final class RegistryOrderEntry extends GuiConfigEntries.CategoryEntry {
+
+    public RegistryOrderEntry(GuiConfig owningScreen, GuiConfigEntries owningEntryList,
+            IConfigElement<?> configElement) {
+        super(owningScreen, owningEntryList, configElement);
+    }
+
+    @Override
+    protected GuiScreen buildChildScreen() {
+        List<IConfigElement<?>> childElements = this.configElement.getChildElements();
+        IConfigElement<?> disabled = null, order = null;
+        for (IConfigElement<?> e : childElements) {
+            if (e.getName().equals("disabled")) disabled = e;
+            else if (e.getName().equals("ordering")) order = e;
+        }
+        if (disabled == null || order == null) {
+            throw new IllegalArgumentException("Did not find expected config entires");
+        }
+        return new GuiEditRegistryConfig(
+                this.owningScreen,
+                disabled,
+                order,
+                configElement.getName(),
+                this.owningScreen.modID,
+                null,
+                owningScreen.allRequireWorldRestart || this.configElement.requiresWorldRestart(),
+                owningScreen.allRequireMcRestart || this.configElement.requiresMcRestart(),
+                this.owningScreen.title,
+                ((this.owningScreen.titleLine2 == null ? "" : this.owningScreen.titleLine2) + " > " + this.name));
+    }
+
+    private GuiEditRegistryConfig getChildScreen() {
+        return (GuiEditRegistryConfig) childScreen;
+    }
+
+    @Override
+    public boolean saveConfigElement() {
+        GuiEditRegistryConfig c = getChildScreen();
+        if (c != null && c.isInitialized()) return c.saveConfigElements();
+        return false;
+    }
+
+    @Override
+    public boolean isChanged() {
+        GuiEditRegistryConfig c = getChildScreen();
+        return c != null && c.isInitialized() && c.isChanged();
+    }
+
+    @Override
+    public boolean isDefault() {
+        GuiEditRegistryConfig c = getChildScreen();
+        return c != null && c.isInitialized() && c.isDefault();
+    }
+
+    @Override
+    public void setToDefault() {
+        GuiEditRegistryConfig c = getChildScreen();
+        if (c != null && c.isInitialized()) c.setToDefault();
+    }
+
+    @Override
+    public void undoChanges() {
+        GuiEditRegistryConfig c = getChildScreen();
+        if (c != null && c.isInitialized()) c.undoChanges();
+    }
+}

src/main/java/com/gtnewhorizon/structurelib/SortedRegistry.java

@@ -0,0 +1,197 @@
+package com.gtnewhorizon.structurelib;
+
+import java.lang.ref.WeakReference;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.IdentityHashMap;
+import java.util.Iterator;
+import java.util.List;
+import java.util.Map;
+import java.util.NavigableMap;
+import java.util.Set;
+import java.util.Spliterator;
+import java.util.TreeMap;
+import java.util.UUID;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.function.Consumer;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+import javax.annotation.Nullable;
+
+import net.minecraft.entity.player.EntityPlayerMP;
+import net.minecraft.server.MinecraftServer;
+
+import org.apache.commons.lang3.tuple.Pair;
+
+import com.gtnewhorizon.structurelib.net.RegistryOrderSyncMessage;
+
+import cpw.mods.fml.common.FMLCommonHandler;
+import cpw.mods.fml.common.eventhandler.SubscribeEvent;
+import cpw.mods.fml.common.gameevent.PlayerEvent;
+
+public class SortedRegistry<V> implements Iterable<V> {
+
+    static final ConcurrentHashMap<String, WeakReference<SortedRegistry<?>>> ALL_REGISTRIES = new ConcurrentHashMap<>();
+    static {
+        RegistryOrderSyncMessage.Handler.setAllRegistries(ALL_REGISTRIES);
+    }
+    private final NavigableMap<String, V> store = new TreeMap<>();
+    /**
+     * Store stuff in an array for faster iteration access than a red black tree
+     */
+    private List<V> baked = Collections.emptyList();
+
+    private final Map<UUID, Pair<List<String>, List<String>>> playerOrdering = new HashMap<>();
+    private final Map<UUID, List<V>> playerBaked = new HashMap<>();
+
+    /**
+     * Construct an unsynchronized registry
+     */
+    public SortedRegistry() {}
+
+    /**
+     * Construct a synchronized registry whose ordering will be synced to the server
+     *
+     * @param name network name
+     */
+
+    public SortedRegistry(String name) {
+        WeakReference<SortedRegistry<?>> oldValue = ALL_REGISTRIES.put(name, new WeakReference<>(this));
+        if (oldValue != null && oldValue.get() != null) {
+            throw new IllegalArgumentException("duplicate name");
+        }
+        FMLCommonHandler.instance().bus().register(this);
+    }
+
+    public static Set<String> getRegistryNames() {
+        return ALL_REGISTRIES.keySet();
+    }
+
+    public static SortedRegistry<?> getRegistry(String name) {
+        WeakReference<SortedRegistry<?>> ref = ALL_REGISTRIES.get(name);
+        return ref != null ? ref.get() : null;
+    }
+
+    static void cleanup(MinecraftServer server) {
+        List<EntityPlayerMP> players = server.getConfigurationManager().playerEntityList;
+        Set<UUID> onlinePlayerIDs = players.stream().map(EntityPlayerMP::getUniqueID).collect(Collectors.toSet());
+        int removed = 0;
+        for (WeakReference<SortedRegistry<?>> ref : ALL_REGISTRIES.values()) {
+            SortedRegistry<?> registry = ref.get();
+            if (registry == null) continue;
+            for (Iterator<UUID> iterator = registry.playerOrdering.keySet().iterator(); iterator.hasNext();) {
+                UUID uuid = iterator.next();
+                if (!onlinePlayerIDs.contains(uuid)) {
+                    iterator.remove();
+                    registry.playerBaked.remove(uuid);
+                    removed++;
+                }
+            }
+        }
+        if (removed > 0) {
+            StructureLib.LOGGER.debug("Removed {} registry record for logged out players", removed);
+        }
+    }
+
+    @SubscribeEvent
+    public void onPlayerLogOut(PlayerEvent.PlayerLoggedOutEvent e) {
+        playerOrdering.remove(e.player.getUniqueID());
+        playerBaked.remove(e.player.getUniqueID());
+    }
+
+    public void register(String key, V val) {
+        if (key == null || val == null) throw new NullPointerException();
+        V old = store.putIfAbsent(key, val);
+        if (old != null) {
+            throw new IllegalArgumentException("Duplicate key: " + key);
+        }
+        baked = new ArrayList<>(store.values());
+        for (Map.Entry<UUID, Pair<List<String>, List<String>>> e : playerOrdering.entrySet()) {
+            makePlayerBaked(e.getKey(), e.getValue().getKey(), e.getValue().getValue());
+        }
+    }
+
+    public void registerOrdering(EntityPlayerMP player, List<String> ordering, List<String> disabled) {
+        registerOrdering(player.getUniqueID(), ordering, disabled);
+    }
+
+    public void registerOrdering(UUID playerID, List<String> ordering, List<String> disabled) {
+        playerOrdering.put(playerID, Pair.of(ordering, disabled));
+        makePlayerBaked(playerID, ordering, disabled);
+    }
+
+    private void makePlayerBaked(UUID player, List<String> ordering, List<String> disabled) {
+        TreeMap<String, V> copy = new TreeMap<>(store);
+        for (String s : disabled) {
+            copy.remove(s);
+        }
+        List<V> b = new ArrayList<>();
+        for (String k : ordering) {
+            V v = copy.remove(k);
+            if (v != null) {
+                b.add(v);
+            }
+        }
+        b.addAll(copy.values());
+        playerBaked.put(player, b);
+    }
+
+    public int size() {
+        return store.size();
+    }
+
+    public boolean isEmpty() {
+        return store.isEmpty();
+    }
+
+    public boolean containsKey(String key) {
+        return store.containsKey(key);
+    }
+
+    public boolean containsValue(V value) {
+        return store.containsValue(value);
+    }
+
+    public V get(String key) {
+        return store.get(key);
+    }
+
+    public Iterable<V> getPlayerOrdering(@Nullable EntityPlayerMP player) {
+        if (player == null) return baked;
+        List<V> playerPreference = playerBaked.get(player.getUniqueID());
+        if (playerPreference == null) return baked;
+        return playerPreference;
+    }
+
+    public Stream<String> getPlayerOrderingKeys(@Nullable EntityPlayerMP player) {
+        if (player == null) return store.keySet().stream();
+        List<V> playerOrder = playerBaked.get(player.getUniqueID());
+        if (playerOrder == null) return store.keySet().stream();
+
+        // rebuild the order from the baked map
+        Map<V, String> reverseMap = new IdentityHashMap<>();
+        store.forEach((k, v) -> reverseMap.put(v, k));
+        return playerOrder.stream().map(reverseMap::get);
+    }
+
+    Iterable<String> getCurrentOrdering() {
+        return store.keySet();
+    }
+
+    @Override
+    public Iterator<V> iterator() {
+        return baked.iterator();
+    }
+
+    @Override
+    public void forEach(Consumer<? super V> action) {
+        baked.forEach(action);
+    }
+
+    @Override
+    public Spliterator<V> spliterator() {
+        return baked.spliterator();
+    }
+}

src/main/java/com/gtnewhorizon/structurelib/StructureEvent.java

@@ -4,6 +4,7 @@ import net.minecraft.world.World;
 import net.minecraftforge.common.MinecraftForge;
 
 import com.gtnewhorizon.structurelib.structure.IStructureElement;
+
 import cpw.mods.fml.common.eventhandler.Event;
 
 /**

src/main/java/com/gtnewhorizon/structurelib/StructureLib.java

@@ -1,29 +1,42 @@
 package com.gtnewhorizon.structurelib;
 
+import static com.gtnewhorizon.structurelib.StructureLibAPI.CHANNEL_SHOW_ERROR;
+import static com.gtnewhorizon.structurelib.StructureLibAPI.MOD_ID;
+
 import net.minecraft.block.Block;
 import net.minecraft.creativetab.CreativeTabs;
 import net.minecraft.entity.player.EntityPlayer;
 import net.minecraft.item.Item;
 import net.minecraft.item.ItemBlock;
+import net.minecraft.item.ItemStack;
 import net.minecraft.launchwrapper.Launch;
+import net.minecraft.nbt.NBTTagCompound;
+import net.minecraft.nbt.NBTTagList;
+import net.minecraftforge.common.util.Constants;
 
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 
 import com.gtnewhorizon.structurelib.block.BlockHint;
 import com.gtnewhorizon.structurelib.command.CommandConfigureChannels;
+import com.gtnewhorizon.structurelib.command.CommandRegistryDebug;
 import com.gtnewhorizon.structurelib.item.ItemBlockHint;
 import com.gtnewhorizon.structurelib.item.ItemConstructableTrigger;
+import com.gtnewhorizon.structurelib.item.ItemDebugConstructableTrigger;
 import com.gtnewhorizon.structurelib.item.ItemFrontRotationTool;
 import com.gtnewhorizon.structurelib.net.AlignmentMessage;
 import com.gtnewhorizon.structurelib.net.ErrorHintParticleMessage;
+import com.gtnewhorizon.structurelib.net.RegistryOrderSyncMessage;
 import com.gtnewhorizon.structurelib.net.SetChannelDataMessage;
 import com.gtnewhorizon.structurelib.net.UpdateHintParticleMessage;
+import com.gtnewhorizon.structurelib.util.InventoryUtility;
 import com.gtnewhorizon.structurelib.util.XSTR;
 
-import cpw.mods.fml.common.Loader;
 import cpw.mods.fml.common.Mod;
 import cpw.mods.fml.common.SidedProxy;
+import cpw.mods.fml.common.event.FMLInitializationEvent;
+import cpw.mods.fml.common.event.FMLInterModComms;
+import cpw.mods.fml.common.event.FMLLoadCompleteEvent;
 import cpw.mods.fml.common.event.FMLPreInitializationEvent;
 import cpw.mods.fml.common.event.FMLServerStartingEvent;
 import cpw.mods.fml.common.network.NetworkRegistry;
@@ -36,9 +49,9 @@ import cpw.mods.fml.relauncher.SideOnly;
  * This class does not contain a stable API. Refrain from using this class.
  */
 @Mod(
-        modid = StructureLibAPI.MOD_ID,
+        modid = MOD_ID,
         name = "StructureLib",
-        version = "GRADLETOKEN_VERSION",
+        version = Tags.VERSION,
         acceptableRemoteVersions = "*",
         guiFactory = "com.gtnewhorizon.structurelib.GuiFactory")
 public class StructureLib {
@@ -53,7 +66,7 @@ public class StructureLib {
             clientSide = "com.gtnewhorizon.structurelib.ClientProxy")
     static CommonProxy proxy;
 
-    static final SimpleNetworkWrapper net = NetworkRegistry.INSTANCE.newSimpleChannel(StructureLibAPI.MOD_ID);
+    static final SimpleNetworkWrapper net = NetworkRegistry.INSTANCE.newSimpleChannel(MOD_ID);
 
     static {
         net.registerMessage(
@@ -65,6 +78,7 @@ public class StructureLib {
         net.registerMessage(UpdateHintParticleMessage.Handler.class, UpdateHintParticleMessage.class, 2, Side.CLIENT);
         net.registerMessage(SetChannelDataMessage.Handler.class, SetChannelDataMessage.class, 3, Side.SERVER);
         net.registerMessage(ErrorHintParticleMessage.Handler.class, ErrorHintParticleMessage.class, 4, Side.CLIENT);
+        net.registerMessage(RegistryOrderSyncMessage.Handler.class, RegistryOrderSyncMessage.class, 5, Side.SERVER);
 
         try {
             DEBUG_MODE = Boolean.parseBoolean(System.getProperty("structurelib.debug"));
@@ -79,13 +93,14 @@ public class StructureLib {
 
     @Mod.Instance
     static StructureLib INSTANCE;
-
+    @Mod.Instance(STRUCTURECOMPAT_MODID)
     static Object COMPAT;
 
     static Block blockHint;
     static Item itemBlockHint;
     static Item itemFrontRotationTool;
     static Item itemConstructableTrigger;
+    static Item itemDebugConstructableTrigger;
     public static final CreativeTabs creativeTab = new CreativeTabs("structurelib") {
 
         @Override
@@ -106,17 +121,75 @@ public class StructureLib {
         GameRegistry.registerItem(
                 itemConstructableTrigger = new ItemConstructableTrigger(),
                 itemConstructableTrigger.getUnlocalizedName());
+        GameRegistry.registerItem(
+                itemDebugConstructableTrigger = new ItemDebugConstructableTrigger(),
+                itemDebugConstructableTrigger.getUnlocalizedName());
         proxy.preInit(e);
         NetworkRegistry.INSTANCE.registerGuiHandler(instance(), new GuiHandler());
 
-        if (Loader.isModLoaded(STRUCTURECOMPAT_MODID)) {
-            COMPAT = Loader.instance().getIndexedModList().get(STRUCTURECOMPAT_MODID).getMod();
-        }
+        InventoryUtility.init();
+
+        ChannelDescription.set(CHANNEL_SHOW_ERROR, MOD_ID, "channels.structurelib.show_errors");
+
+        DevelopHelper.onPreInit();
+    }
+
+    @Mod.EventHandler
+    public void init(FMLInitializationEvent e) {
+        proxy.init(e);
+    }
+
+    @Mod.EventHandler
+    public void loadComplete(FMLLoadCompleteEvent e) {
+        proxy.loadComplete(e);
     }
 
     @Mod.EventHandler
     public void serverStarting(FMLServerStartingEvent e) {
         e.registerServerCommand(new CommandConfigureChannels());
+        e.registerServerCommand(new CommandRegistryDebug());
+    }
+
+    @Mod.EventHandler
+    public void handleIMC(FMLInterModComms.IMCEvent event) {
+        for (FMLInterModComms.IMCMessage message : event.getMessages()) {
+            switch (message.key) {
+                case "register_channel":
+                    processRegisterChannel(message);
+                    break;
+                case "register_channel_item":
+                    processRegisterChannelItem(message);
+                    break;
+            }
+        }
+    }
+
+    private void processRegisterChannel(FMLInterModComms.IMCMessage message) {
+        NBTTagList tags = message.getNBTValue().getTagList("Channels", Constants.NBT.TAG_COMPOUND);
+        for (int i = 0; i < tags.tagCount(); i++) {
+            NBTTagCompound tag = tags.getCompoundTagAt(i);
+            StructureLibAPI.registerChannelDescription(
+                    tag.getString("Channel"),
+                    message.getSender(),
+                    tag.getString("Description"));
+        }
+    }
+
+    private void processRegisterChannelItem(FMLInterModComms.IMCMessage message) {
+        NBTTagList items = message.getNBTValue().getTagList("Items", Constants.NBT.TAG_COMPOUND);
+        for (int i = 0; i < items.tagCount(); i++) {
+            NBTTagCompound itemTag = items.getCompoundTagAt(i);
+            ItemStack item = ItemStack.loadItemStackFromNBT(itemTag.getCompoundTag("Item"));
+            NBTTagList tags = itemTag.getTagList("Channels", Constants.NBT.TAG_COMPOUND);
+            for (int j = 0; j < tags.tagCount(); j++) {
+                NBTTagCompound tag = tags.getCompoundTagAt(j);
+                StructureLibAPI.registerChannelItem(
+                        tag.getString("Channel"),
+                        message.getSender(),
+                        tag.getInteger("Value"),
+                        item);
+            }
+        }
     }
 
     public static void addClientSideChatMessages(String... messages) {

src/main/java/com/gtnewhorizon/structurelib/StructureLibAPI.java

@@ -11,12 +11,14 @@ import net.minecraft.util.IChatComponent;
 import net.minecraft.util.IIcon;
 import net.minecraft.world.World;
 
+import com.gtnewhorizon.gtnhlib.util.AnimatedTooltipHandler;
 import com.gtnewhorizon.structurelib.alignment.IAlignment;
 import com.gtnewhorizon.structurelib.alignment.IAlignmentProvider;
 import com.gtnewhorizon.structurelib.alignment.enumerable.ExtendedFacing;
 import com.gtnewhorizon.structurelib.net.AlignmentMessage;
 import com.gtnewhorizon.structurelib.structure.AutoPlaceEnvironment;
 import com.gtnewhorizon.structurelib.structure.IStructureDefinition;
+
 import cpw.mods.fml.common.network.NetworkRegistry;
 
 /**
@@ -42,6 +44,7 @@ public class StructureLibAPI {
     public static final int HINT_BLOCK_META_AIR = 13;
     public static final int HINT_BLOCK_META_NOT_AIR = 14;
     public static final int HINT_BLOCK_META_ERROR = 15;
+    public static final String CHANNEL_SHOW_ERROR = "show_error";
     static final ThreadLocal<Object> instrument = new ThreadLocal<>();
 
     /**
@@ -71,7 +74,7 @@ public class StructureLibAPI {
      */
     public static void enableInstrument(Object identifier) {
         if (isInstrumentEnabled()) throw new IllegalStateException();
-        instrument.set(instrument);
+        instrument.set(identifier);
     }
 
     /**
@@ -349,4 +352,37 @@ public class StructureLibAPI {
             short intervalRequired, boolean forceUpdateLastSend) {
         proxy.addThrottledChat(throttleKey, player, text, intervalRequired, forceUpdateLastSend);
     }
+
+    /**
+     * Register a channel description here. The description should describe how a channel will be used inside your mod.
+     *
+     * @param channel     channel key
+     * @param modid       your modid
+     * @param description localization key for your description
+     */
+    public static void registerChannelDescription(final String channel, final String modid, final String description) {
+        ChannelDescription.set(channel, modid, description);
+    }
+
+    /**
+     * Register an item stack as an indicator for a (channel, value) pair.
+     *
+     * @param channel      channel key
+     * @param modid        your modid
+     * @param channelValue value
+     * @param stack        item stack. having a metadata of
+     *                     {@link net.minecraftforge.oredict.OreDictionary#WILDCARD_VALUE} will match without comparing
+     *                     NBT or metadata value. having a tag with {@code tag.getBoolean("*") == true} will match
+     *                     without comparing NBT.
+     */
+    public static void registerChannelItem(final String channel, final String modid, final int channelValue,
+            final ItemStack stack) {
+        ChannelDescription.item(channel, channelValue, stack);
+        AnimatedTooltipHandler.addItemTooltip(
+                stack,
+                AnimatedTooltipHandler.translatedText("structurelib.tooltip.channelvalue", channelValue, channel));
+        AnimatedTooltipHandler.addItemTooltip(
+                stack,
+                AnimatedTooltipHandler.translatedText("structurelib.tooltip.indicator_dnd", channelValue, channel));
+    }
 }

src/main/java/com/gtnewhorizon/structurelib/alignment/IAlignment.java

@@ -190,4 +190,28 @@ public interface IAlignment extends IAlignmentLimits, IAlignmentProvider {
         return getAlignmentLimits()
                 .isNewExtendedFacingValid(alignment.getDirection(), alignment.getRotation(), alignment.getFlip());
     }
+
+    /**
+     * Check if this object support a flip change, assuming both direction and rotation is not changed.
+     */
+    default boolean isFlipChangeAllowed() {
+        ExtendedFacing facing = getExtendedFacing();
+        for (Flip flip : Flip.VALUES) {
+            if (flip == getFlip()) continue;
+            if (isNewExtendedFacingValid(facing.with(flip))) return true;
+        }
+        return false;
+    }
+
+    /**
+     * Check if this object support a rotation change, assuming both direction and flip is not changed.
+     */
+    default boolean isRotationChangeAllowed() {
+        ExtendedFacing facing = getExtendedFacing();
+        for (Rotation rotation : Rotation.VALUES) {
+            if (rotation == getRotation()) continue;
+            if (isNewExtendedFacingValid(facing.with(rotation))) return true;
+        }
+        return false;
+    }
 }

src/main/java/com/gtnewhorizon/structurelib/alignment/IAlignmentLimits.java

@@ -14,8 +14,28 @@ import com.gtnewhorizon.structurelib.alignment.enumerable.Rotation;
 
 public interface IAlignmentLimits {
 
+    /**
+     * Can be placed in any orientation.
+     */
     IAlignmentLimits UNLIMITED = (direction, rotation, flip) -> true;
 
+    /**
+     * Must be standing upright; i.e., top side of the block facing up.
+     */
+    IAlignmentLimits UPRIGHT = (direction, rotation, flip) -> direction.offsetY == 0
+            && (flip.isVerticallyFliped() ? rotation.isUpsideDown() : rotation.isNotRotated());
+
+    /**
+     * Can be in any orientation except upside down; i.e., top side of the block facing down.
+     */
+    IAlignmentLimits NOT_UPSIDE_DOWN = (direction, rotation, flip) -> direction.offsetY != 0
+            || (flip.isVerticallyFliped() ? !rotation.isNotRotated() : !rotation.isUpsideDown());
+
+    /**
+     * Front side of the block must be facing up.
+     */
+    IAlignmentLimits FACING_UP = (direction, rotation, flip) -> direction == ForgeDirection.UP;
+
     boolean isNewExtendedFacingValid(ForgeDirection direction, Rotation rotation, Flip flip);
 
     default boolean isNewExtendedFacingValid(ExtendedFacing alignment) {

src/main/java/com/gtnewhorizon/structurelib/alignment/constructable/ChannelDataAccessor.java

@@ -38,7 +38,9 @@ public class ChannelDataAccessor {
      * If given subchannel does not exist, masterStack may or may not be returned to save performance. Code within
      * StructureLib can depend on this behavior, you cannot.
      *
-     * @param masterStack trigger item. can be the return value of another {@link #withChannel(ItemStack, String)} call
+     * @param masterStack trigger item. can be the return value of another
+     *                    {@link com.gtnewhorizon.structurelib.alignment.constructable.ChannelDataAccessor#withChannel(net.minecraft.item.ItemStack, String)}
+     *                    call
      * @param channel     subchannel to use. will use current master channel data instead if this channel does not exist
      *                    Note: all channel identifiers are supposed to be lower case and not empty.
      * @return a trigger item with new master channel
@@ -107,13 +109,13 @@ public class ChannelDataAccessor {
      * 
      * @param masterStack trigger stack to check
      * @param channel     channel identifier. Note: all channel identifiers are supposed to be lower case and not empty.
-     * @param data        subchannel data. should always be a positive value
+     * @param data        positive subchannel data
      */
     public static void setChannelData(ItemStack masterStack, String channel, int data) {
         if (StringUtils.isEmpty(channel) || masterStack == null) throw new IllegalArgumentException();
+        if (data < 1) throw new IllegalArgumentException("Channel data must be positive");
         if (StructureLibAPI.isDebugEnabled() && !channel.toLowerCase(Locale.ROOT).equals(channel))
             throw new IllegalArgumentException("Channel name can be lower case ONLY");
-        if (data <= 0) throw new IllegalArgumentException();
         if (masterStack.stackTagCompound == null) masterStack.stackTagCompound = new NBTTagCompound();
         NBTTagCompound main = masterStack.stackTagCompound;
         if (!main.hasKey(SECONDARY_HINT_TAG, TAG_COMPOUND)) main.setTag(SECONDARY_HINT_TAG, new NBTTagCompound());
@@ -146,7 +148,12 @@ public class ChannelDataAccessor {
      */
     public static void wipeChannelData(ItemStack masterStack) {
         if (masterStack == null) throw new IllegalArgumentException();
-        if (masterStack.stackTagCompound != null) masterStack.stackTagCompound.removeTag(SECONDARY_HINT_TAG);
+        if (masterStack.stackTagCompound != null) {
+            masterStack.stackTagCompound.removeTag(SECONDARY_HINT_TAG);
+            if (masterStack.stackTagCompound.hasNoTags()) {
+                masterStack.stackTagCompound = null;
+            }
+        }
     }
 
     /**

src/main/java/com/gtnewhorizon/structurelib/alignment/constructable/ConstructableUtility.java

@@ -16,6 +16,7 @@ import com.gtnewhorizon.structurelib.StructureLib;
 import com.gtnewhorizon.structurelib.StructureLibAPI;
 import com.gtnewhorizon.structurelib.alignment.IAlignment;
 import com.gtnewhorizon.structurelib.alignment.enumerable.ExtendedFacing;
+import com.gtnewhorizon.structurelib.item.ItemDebugConstructableTrigger;
 import com.gtnewhorizon.structurelib.structure.IItemSource;
 import com.gtnewhorizon.structurelib.structure.ISurvivalBuildEnvironment;
 
@@ -70,11 +71,10 @@ public class ConstructableUtility {
 
         if (constructable == null) return false;
 
-        if (aPlayer instanceof EntityPlayerMP) {
-            EntityPlayerMP playerMP = (EntityPlayerMP) aPlayer;
+        if (aPlayer instanceof EntityPlayerMP playerMP) {
             // server side and sneaking (already checked above)
             // do construct
-            if (aPlayer.capabilities.isCreativeMode) {
+            if (aPlayer.capabilities.isCreativeMode || aStack.getItem() instanceof ItemDebugConstructableTrigger) {
                 constructable.construct(aStack, false);
             } else if (constructable instanceof ISurvivalConstructable) {
                 int built = ((ISurvivalConstructable) constructable).survivalConstruct(

src/main/java/com/gtnewhorizon/structurelib/alignment/enumerable/ExtendedFacing.java

@@ -4,9 +4,18 @@ import static com.gtnewhorizon.structurelib.alignment.IAlignment.FLIPS_COUNT;
 import static com.gtnewhorizon.structurelib.alignment.IAlignment.ROTATIONS_COUNT;
 import static java.lang.Math.abs;
 import static java.util.Arrays.stream;
-import static java.util.stream.Collectors.*;
+import static java.util.stream.Collectors.collectingAndThen;
+import static java.util.stream.Collectors.groupingBy;
+import static java.util.stream.Collectors.toMap;
+import static java.util.stream.Collectors.toSet;
 
-import java.util.*;
+import java.util.ArrayList;
+import java.util.EnumMap;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Locale;
+import java.util.Map;
+import java.util.Random;
 
 import net.minecraft.util.StatCollector;
 import net.minecraft.util.Vec3;

src/main/java/com/gtnewhorizon/structurelib/block/BlockHint.java

@@ -50,6 +50,10 @@ public class BlockHint extends Block {
 
     @Override
     public IIcon getIcon(int aSide, int aMeta) {
+        // For numbered hints, top and bottom are blank
+        if (aSide <= 1 && aMeta <= 11) {
+            return hint[13];
+        }
         return hint[aMeta];
     }
 
@@ -61,10 +65,9 @@ public class BlockHint extends Block {
     }
 
     @Override
-    @SuppressWarnings("unchecked")
-    public void getSubBlocks(Item aItem, CreativeTabs par2CreativeTabs, List aList) {
+    public void getSubBlocks(Item item, CreativeTabs tab, List<ItemStack> list) {
         for (int i = 0; i <= 15; i++) {
-            aList.add(new ItemStack(aItem, 1, i));
+            list.add(new ItemStack(item, 1, i));
         }
     }
 }

src/main/java/com/gtnewhorizon/structurelib/command/CommandConfigureChannels.java

@@ -26,7 +26,7 @@ public class CommandConfigureChannels extends CommandBase {
     public String getCommandUsage(ICommandSender p_71518_1_) {
         return "/sl_channel <wipe/getall>\n" + "/sl_channel <get/unset> <channel name>\n"
                 + "/sl_channel <set> <channel name> <value>\n"
-                + "<channel name> can have space in it. <value> must be positive integer";
+                + "<channel name> can have space in it. Values below 1 clear the channel";
     }
 
     @Override
@@ -35,7 +35,7 @@ public class CommandConfigureChannels extends CommandBase {
     }
 
     @Override
-    public List<?> addTabCompletionOptions(ICommandSender p_71516_1_, String[] p_71516_2_) {
+    public List<String> addTabCompletionOptions(ICommandSender p_71516_1_, String[] p_71516_2_) {
         if (p_71516_2_.length == 1)
             return getListOfStringsMatchingLastWord(p_71516_2_, "get", "set", "unset", "wipe", "getall");
         return null;
@@ -45,9 +45,7 @@ public class CommandConfigureChannels extends CommandBase {
     public void processCommand(ICommandSender sender, String[] args) {
         if (args.length == 0) throw new WrongUsageException(getCommandUsage(sender));
 
-        if (!(sender instanceof EntityPlayerMP)) throw new WrongUsageException("must be a player");
-
-        EntityPlayerMP player = (EntityPlayerMP) sender;
+        if (!(sender instanceof EntityPlayerMP player)) throw new WrongUsageException("must be a player");
 
         ItemStack heldItem = player.getHeldItem();
         if (heldItem == null || !(heldItem.getItem() instanceof ItemConstructableTrigger)) {
@@ -110,11 +108,14 @@ public class CommandConfigureChannels extends CommandBase {
                     throw new WrongUsageException("%s not a valid value", args[args.length - 1]);
                 }
 
-                if (value <= 0) throw new WrongUsageException("%s not a valid value", args[args.length - 1]);
-
-                ChannelDataAccessor.setChannelData(heldItem, channel, value);
+                if (value < 1) {
+                    ChannelDataAccessor.unsetChannelData(heldItem, channel);
+                } else {
+                    ChannelDataAccessor.setChannelData(heldItem, channel, value);
+                }
                 player.inventoryContainer.detectAndSendChanges();
-                sender.addChatMessage(new ChatComponentText(channel + " value: " + value));
+                sender.addChatMessage(
+                        new ChatComponentText(value < 1 ? channel + " no value" : channel + " value: " + value));
                 break;
         }
     }

src/main/java/com/gtnewhorizon/structurelib/command/CommandRegistryDebug.java

@@ -0,0 +1,50 @@
+package com.gtnewhorizon.structurelib.command;
+
+import java.util.List;
+
+import net.minecraft.command.CommandBase;
+import net.minecraft.command.ICommandSender;
+import net.minecraft.command.WrongUsageException;
+import net.minecraft.entity.player.EntityPlayerMP;
+import net.minecraft.util.ChatComponentText;
+
+import com.gtnewhorizon.structurelib.SortedRegistry;
+
+public class CommandRegistryDebug extends CommandBase {
+
+    @Override
+    public String getCommandName() {
+        return "sl_registry_debug";
+    }
+
+    @Override
+    public String getCommandUsage(ICommandSender p_71518_1_) {
+        return "/sl_registry_debug <registry name>";
+    }
+
+    @Override
+    public int getRequiredPermissionLevel() {
+        return 0;
+    }
+
+    @Override
+    public List<String> addTabCompletionOptions(ICommandSender p_71516_1_, String[] p_71516_2_) {
+        if (p_71516_2_.length == 1) return getListOfStringsMatchingLastWord(
+                p_71516_2_,
+                SortedRegistry.getRegistryNames().toArray(new String[0]));
+        return null;
+    }
+
+    @Override
+    public void processCommand(ICommandSender sender, String[] args) {
+        if (args.length != 1) throw new WrongUsageException(getCommandUsage(sender));
+
+        if (!(sender instanceof EntityPlayerMP player)) throw new WrongUsageException("must be a player");
+
+        SortedRegistry<?> registry = SortedRegistry.getRegistry(args[0]);
+        if (registry == null) throw new WrongUsageException("registry not found");
+
+        player.addChatMessage(new ChatComponentText("Current order:"));
+        registry.getPlayerOrderingKeys(player).map(ChatComponentText::new).forEach(player::addChatMessage);
+    }
+}

src/main/java/com/gtnewhorizon/structurelib/core/StructureLibCore.java

@@ -0,0 +1,57 @@
+package com.gtnewhorizon.structurelib.core;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+
+import com.gtnewhorizon.gtnhmixins.IEarlyMixinLoader;
+
+import cpw.mods.fml.relauncher.FMLLaunchHandler;
+import cpw.mods.fml.relauncher.IFMLLoadingPlugin;
+import cpw.mods.fml.relauncher.Side;
+
+@IFMLLoadingPlugin.MCVersion("1.7.10")
+public class StructureLibCore implements IFMLLoadingPlugin, IEarlyMixinLoader {
+
+    @Override
+    public String[] getASMTransformerClass() {
+        return null;
+    }
+
+    @Override
+    public String getModContainerClass() {
+        return null;
+    }
+
+    @Override
+    public String getSetupClass() {
+        return null;
+    }
+
+    @Override
+    public void injectData(Map<String, Object> data) {
+
+    }
+
+    @Override
+    public String getAccessTransformerClass() {
+        return null;
+    }
+
+    @Override
+    public String getMixinConfig() {
+        return "mixins.structurelib.early.json";
+    }
+
+    @Override
+    public List<String> getMixins(Set<String> loadedCoreMods) {
+        List<String> mixins = new ArrayList<>(
+                Arrays.asList("blockChangeNotifier.MixinForgeHooks", "blockChangeNotifier.MixinWorld"));
+        if (FMLLaunchHandler.side() == Side.CLIENT) {
+            mixins.add("MixinGuiContainer_PickChannel");
+        }
+        return mixins;
+    }
+}

src/main/java/com/gtnewhorizon/structurelib/event/BlockChangeListener.java

@@ -0,0 +1,11 @@
+package com.gtnewhorizon.structurelib.event;
+
+import net.minecraft.block.Block;
+import net.minecraft.world.World;
+import net.minecraft.world.chunk.Chunk;
+
+public interface BlockChangeListener {
+
+    void onBlockChange(World world, Chunk chunk, int x, int y, int z, Block oldBlock, Block newBlock, int oldMeta,
+            int newMeta);
+}

src/main/java/com/gtnewhorizon/structurelib/event/BlockChangeNotifier.java

@@ -0,0 +1,33 @@
+package com.gtnewhorizon.structurelib.event;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import net.minecraft.block.Block;
+import net.minecraft.world.World;
+import net.minecraft.world.chunk.Chunk;
+
+@SuppressWarnings("ForLoopReplaceableByForEach")
+public class BlockChangeNotifier {
+
+    private static final List<BlockChangeListener> listeners = new ArrayList<>();
+
+    public static synchronized void addListener(BlockChangeListener listener) {
+        listeners.add(listener);
+    }
+
+    public static void onBlockChange(World world, Chunk chunk, int x, int y, int z, Block oldBlock, Block newBlock,
+            int oldMeta, int newMeta) {
+        if (oldBlock == newBlock && oldMeta == newMeta) return;
+
+        if (chunk == null) {
+            chunk = world.getChunkFromBlockCoords(x, z);
+        }
+
+        final int numListeners = listeners.size();
+        for (int i = 0; i < numListeners; i++) {
+            final BlockChangeListener listener = listeners.get(i);
+            listener.onBlockChange(world, chunk, x, y, z, oldBlock, newBlock, oldMeta, newMeta);
+        }
+    }
+}

src/main/java/com/gtnewhorizon/structurelib/gui/EmptyContainer.java

@@ -0,0 +1,18 @@
+package com.gtnewhorizon.structurelib.gui;
+
+import net.minecraft.entity.player.EntityPlayer;
+import net.minecraft.inventory.Container;
+
+public class EmptyContainer extends Container {
+
+    private final EntityPlayer player;
+
+    public EmptyContainer(EntityPlayer player) {
+        this.player = player;
+    }
+
+    @Override
+    public boolean canInteractWith(EntityPlayer player) {
+        return player == this.player;
+    }
+}

src/main/java/com/gtnewhorizon/structurelib/gui/GuiScreenConfigureChannels.java

@@ -1,45 +1,85 @@
 package com.gtnewhorizon.structurelib.gui;
 
+import java.util.AbstractMap;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.HashSet;
 import java.util.List;
 import java.util.Locale;
+import java.util.Map;
 import java.util.Map.Entry;
+import java.util.Set;
 import java.util.stream.Collectors;
+import java.util.stream.StreamSupport;
 
 import net.minecraft.client.gui.GuiButton;
-import net.minecraft.client.gui.GuiScreen;
 import net.minecraft.client.gui.GuiTextField;
+import net.minecraft.client.gui.inventory.GuiContainer;
 import net.minecraft.client.renderer.Tessellator;
 import net.minecraft.client.resources.I18n;
+import net.minecraft.inventory.Container;
 import net.minecraft.item.ItemStack;
 import net.minecraft.util.EnumChatFormatting;
 import net.minecraft.util.ResourceLocation;
+import net.minecraft.util.StatCollector;
 
 import org.apache.commons.lang3.StringUtils;
 import org.lwjgl.input.Keyboard;
 import org.lwjgl.input.Mouse;
 import org.lwjgl.opengl.GL11;
 
+import com.google.common.base.Splitter;
+import com.gtnewhorizon.structurelib.ChannelDescription;
 import com.gtnewhorizon.structurelib.StructureLib;
 import com.gtnewhorizon.structurelib.alignment.constructable.ChannelDataAccessor;
 import com.gtnewhorizon.structurelib.gui.GuiScrollableList.IGuiScreen;
 
-public class GuiScreenConfigureChannels extends GuiScreen implements IGuiScreen {
+import codechicken.nei.VisiblityData;
+import codechicken.nei.api.INEIGuiHandler;
+import codechicken.nei.api.TaggedInventoryArea;
+import cpw.mods.fml.common.Loader;
+import cpw.mods.fml.common.Optional;
+import gnu.trove.map.TIntObjectMap;
+import gnu.trove.map.hash.TIntObjectHashMap;
+
+@Optional.Interface(iface = "codechicken.nei.api.INEIGuiHandler", modid = "NotEnoughItems")
+public class GuiScreenConfigureChannels extends GuiContainer implements IGuiScreen, INEIGuiHandler {
+
+    private static final String I18N_PREFIX = "item.structurelib.constructableTrigger.gui.";
+
+    private static final int ADD_BTN = 0;
+    private static final int UNSET_BTN = 1;
+    private static final int WIPE_BTN = 2;
 
     private static final int KEY_MAX_WIDTH = 50;
+    private static final int INFO_BOX_SIZE = 11;
     private final ItemStack trigger;
     private final GuiChannelsList list;
+    private final GuiAutoCompleteList autoCompleteList;
+    private final Map<String, List<String>> tooltipSplitCache = new HashMap<>();
+    private final TIntObjectMap<Map<String, String>> trimCache = new TIntObjectHashMap<>();
     private GuiTextField key, value;
     protected int guiTop, guiLeft;
+    private List<String> info;
+    private boolean wipePending = false;
+    private long wipePendingTime = 0;
+    private static final long WIPE_CONFIRM_TIMEOUT_MS = 3000;
+
+    public GuiScreenConfigureChannels(Container container, ItemStack trigger) {
+        super(container);
 
-    public GuiScreenConfigureChannels(ItemStack trigger) {
         this.trigger = trigger;
-        list = new GuiChannelsList(152, 100, 12, 12, 14);
+        list = new GuiChannelsList(152, 91, 12, 21, 14);
         list.addSelectionListener((list, selectedIndex) -> {
             Entry<String, Integer> e = list.getElementAt(selectedIndex);
             key.setText(e.getKey());
             value.setText(e.getValue().toString());
             updateButtons();
         });
+        autoCompleteList = new GuiAutoCompleteList(151 + 12 - 45 - 2, 50, 45, 119 + 12, 14);
     }
 
     @Override
@@ -125,33 +165,20 @@ public class GuiScreenConfigureChannels extends GuiScreen implements IGuiScreen
         };
 
         list.onGuiInit(this);
+        autoCompleteList.onGuiInit(this);
 
-        addButton(
-                new GuiButton(
-                        0,
-                        guiLeft + 12,
-                        guiTop + 157,
-                        47,
-                        20,
-                        I18n.format("item.structurelib.constructableTrigger.gui.add")));
-        addButton(
-                new GuiButton(
-                        1,
-                        guiLeft + 65,
-                        guiTop + 157,
-                        47,
-                        20,
-                        I18n.format("item.structurelib.constructableTrigger.gui.unset")));
-        addButton(
-                new GuiButton(
-                        2,
-                        guiLeft + 118,
-                        guiTop + 157,
-                        47,
-                        20,
-                        I18n.format("item.structurelib.constructableTrigger.gui.wipe")));
+        addButton(new GuiButton(ADD_BTN, guiLeft + 12, guiTop + 157, 47, 20, I18n.format(I18N_PREFIX + "add")));
+        addButton(new GuiButton(UNSET_BTN, guiLeft + 65, guiTop + 157, 47, 20, I18n.format(I18N_PREFIX + "unset")));
+        addButton(new GuiButton(WIPE_BTN, guiLeft + 118, guiTop + 157, 47, 20, I18n.format(I18N_PREFIX + "wipe")));
 
         updateButtons();
+        tooltipSplitCache.clear();
+        info = StreamSupport
+                .stream(
+                        Splitter.on("\\n").split(StatCollector.translateToLocal(I18N_PREFIX + "info")).spliterator(),
+                        false)
+                .flatMap(line -> fontRendererObj.listFormattedStringToWidth(line, width * 1 / 3).stream())
+                .collect(Collectors.toList());
     }
 
     @Override
@@ -194,30 +221,54 @@ public class GuiScreenConfigureChannels extends GuiScreen implements IGuiScreen
         actionPerformed(but);
     }
 
-    @SuppressWarnings("unchecked")
-    private List<GuiButton> getButtonList() {
+    public List<GuiButton> getButtonList() {
         return buttonList;
     }
 
+    private boolean isMouseOverValue() {
+        int mx = Mouse.getEventX() * this.width / this.mc.displayWidth;
+        int my = this.height - Mouse.getEventY() * this.height / this.mc.displayHeight - 1;
+        return mx >= value.xPosition && mx < value.xPosition + value.width
+                && my >= value.yPosition
+                && my < value.yPosition + value.height;
+
+    }
+
     @Override
     public void handleMouseInput() {
         int delta = Mouse.getEventDWheel();
-        if (delta != 0) list.handleDWheel(delta);
+        if (delta != 0) {
+            if (isMouseOverValue()) {
+                if (delta > 0) {
+                    value.setText(String.valueOf(getValue() + 1));
+                } else {
+                    value.setText(String.valueOf(Math.max(getValue() - 1, 1)));
+                }
+            } else {
+                list.handleDWheel(delta);
+            }
+        }
         super.handleMouseInput();
     }
 
     @Override
     protected void mouseClicked(int mX, int mY, int button) {
+        super.mouseClicked(mX, mY, button);
         key.mouseClicked(mX, mY, button);
         value.mouseClicked(mX, mY, button);
-        super.mouseClicked(mX, mY, button);
     }
 
     @Override
     protected void keyTyped(char aChar, int aKey) {
+        GuiScrollableList<?> l = key.isFocused() ? autoCompleteList : list;
         switch (aKey) {
             case Keyboard.KEY_TAB:
                 if (key.isFocused()) {
+                    if (autoCompleteList.getSelectedElement() != null) {
+                        key.setText(autoCompleteList.getSelectedElement());
+                        return;
+                    }
+
                     key.setFocused(false);
                     value.setFocused(true);
                 } else {
@@ -227,21 +278,38 @@ public class GuiScreenConfigureChannels extends GuiScreen implements IGuiScreen
                 return;
             case Keyboard.KEY_RETURN:
             case Keyboard.KEY_NUMPADENTER:
-                GuiButton add = getButtonList().get(0);
+                if (key.isFocused() && autoCompleteList.getSelectedElement() != null) {
+                    key.setText(autoCompleteList.getSelectedElement());
+                    key.setFocused(false);
+                    value.setFocused(true);
+                    value.setText("1");
+                    value.setSelectionPos(0);
+                    return;
+                }
+                GuiButton add = getButtonList().get(ADD_BTN);
                 if (add.enabled) doActionPerformed(add);
                 return;
             case Keyboard.KEY_UP:
-                if (list.selectedIndex > 0) list.setSelection(list.selectedIndex - 1);
+                if (l.selectedIndex > 0) l.setSelection(l.selectedIndex - 1);
                 return;
             case Keyboard.KEY_DOWN:
-                if (list.selectedIndex < list.getNumElements() - 1) list.setSelection(list.selectedIndex + 1);
+                if (l.selectedIndex < l.getNumElements() - 1) l.setSelection(l.selectedIndex + 1);
                 return;
+            case Keyboard.KEY_ESCAPE:
+                if (key.isFocused()) {
+                    if (autoCompleteList.getSelectedElement() != null) {
+                        autoCompleteList.reset();
+                    } else {
+                        key.setFocused(false);
+                    }
+                    return;
+                }
+                break;
         }
-        if (key.textboxKeyTyped(aChar, aKey)) {
+        if (key.textboxKeyTyped(aChar, aKey) || value.textboxKeyTyped(aChar, aKey)) {
             updateButtons();
             return;
         }
-        if (value.textboxKeyTyped(aChar, aKey)) return;
         super.keyTyped(aChar, aKey);
     }
 
@@ -250,10 +318,14 @@ public class GuiScreenConfigureChannels extends GuiScreen implements IGuiScreen
         // STACKOVERFLOW!
         String keyText = key.getText();
         boolean existing = !StringUtils.isEmpty(keyText) && ChannelDataAccessor.hasSubChannel(trigger, keyText);
-        getButtonList().get(0).displayString = existing ? I18n.format("item.structurelib.constructableTrigger.gui.set")
-                : I18n.format("item.structurelib.constructableTrigger.gui.add");
-        getButtonList().get(0).enabled = !StringUtils.isBlank(value.getText());
-        getButtonList().get(1).enabled = existing && !StringUtils.isBlank(value.getText());
+        getButtonList().get(ADD_BTN).displayString = existing ? I18n.format(I18N_PREFIX + "set")
+                : I18n.format(I18N_PREFIX + "add");
+        getButtonList().get(ADD_BTN).enabled = !StringUtils.isBlank(key.getText())
+                && !StringUtils.isBlank(value.getText())
+                && Integer.parseInt(value.getText()) > 0;
+        getButtonList().get(UNSET_BTN).enabled = existing && !StringUtils.isBlank(value.getText());
+
+        autoCompleteList.reset();
     }
 
     private int getValue() {
@@ -268,18 +340,31 @@ public class GuiScreenConfigureChannels extends GuiScreen implements IGuiScreen
     protected void actionPerformed(GuiButton btn) {
         if (btn == null) return;
         switch (btn.id) {
-            case 0:
+            case ADD_BTN:
                 int value = getValue();
                 if (value <= 0) return;
                 ChannelDataAccessor.setChannelData(trigger, key.getText(), value);
                 break;
-            case 1:
+            case UNSET_BTN:
                 ChannelDataAccessor.unsetChannelData(trigger, key.getText());
                 break;
-            case 2:
-                ChannelDataAccessor.wipeChannelData(trigger);
+            case WIPE_BTN:
+                if (!wipePending) {
+                    wipePending = true;
+                    wipePendingTime = System.currentTimeMillis();
+                    btn.displayString = I18n.format(I18N_PREFIX + "wipe.confirm");
+                } else {
+                    wipePending = false;
+                    btn.displayString = I18n.format(I18N_PREFIX + "wipe");
+                    ChannelDataAccessor.wipeChannelData(trigger);
+                    key.setText("");
+                    this.value.setText("");
+                }
                 break;
         }
+
+        updateButtons();
+
         super.actionPerformed(btn);
     }
 
@@ -295,35 +380,241 @@ public class GuiScreenConfigureChannels extends GuiScreen implements IGuiScreen
         super.updateScreen();
         key.updateCursorCounter();
         value.updateCursorCounter();
+        if (wipePending && System.currentTimeMillis() - wipePendingTime > WIPE_CONFIRM_TIMEOUT_MS) {
+            wipePending = false;
+            getButtonList().get(WIPE_BTN).displayString = I18n.format(I18N_PREFIX + "wipe");
+        }
     }
 
     @Override
-    public boolean doesGuiPauseGame() {
-        return false;
-    }
-
-    @Override
-    public void drawScreen(int mX, int mY, float partialTick) {
+    public void drawGuiContainerBackgroundLayer(float partialTick, int mX, int mY) {
         mc.renderEngine.bindTexture(new ResourceLocation("structurelib", "textures/gui/channels.png"));
         int topLeftX = (this.width - this.getXSize()) / 2;
         int topLeftY = (this.height - this.getYSize()) / 2;
         drawTexturedModalRect(topLeftX, topLeftY, 0, 0, getXSize(), getYSize());
-        super.drawScreen(mX, mY, partialTick);
         list.drawScreen(mX, mY, partialTick);
-        fontRendererObj.drawString(
-                I18n.format("item.structurelib.constructableTrigger.gui.key"),
-                guiLeft + 12,
-                guiTop + 122,
-                0);
+        fontRendererObj.drawString(I18n.format(I18N_PREFIX + "title"), guiLeft + 12, guiTop + 9, 0);
+        fontRendererObj.drawString(I18n.format(I18N_PREFIX + "key"), guiLeft + 12, guiTop + 122, 0);
         key.drawTextBox();
-        fontRendererObj.drawString(
-                I18n.format("item.structurelib.constructableTrigger.gui.value"),
-                guiLeft + 12,
-                guiTop + 142,
-                0);
+        fontRendererObj.drawString(I18n.format(I18N_PREFIX + "value"), guiLeft + 12, guiTop + 142, 0);
         value.drawTextBox();
     }
 
+    @Override
+    protected void drawGuiContainerForegroundLayer(int mouseX, int mouseY) {
+        if (key.isFocused() && autoCompleteList.getNumElements() > 0) {
+            autoCompleteList.drawScreen(mouseX, mouseY, 0);
+        }
+    }
+
+    @Override
+    public void drawScreen(int mouseX, int mouseY, float partialTicks) {
+        super.drawScreen(mouseX, mouseY, partialTicks);
+        String highlight = null;
+        if (key.isFocused() && autoCompleteList.getNumElements() > 0) {
+            highlight = autoCompleteList.getSelectedElement();
+        }
+        if (highlight == null && ChannelDescription.has(key.getText())) {
+            highlight = key.getText();
+        }
+        if (highlight != null) {
+            drawChannelDescriptionTooltip(highlight);
+        }
+        if (mouseX > xSize + guiLeft - INFO_BOX_SIZE - 12 && mouseX < xSize + guiLeft - 12
+                && mouseY > guiTop + 7
+                && mouseY < guiTop + INFO_BOX_SIZE + 7) {
+            drawHoveringText(info, mouseX, mouseY, fontRendererObj);
+        }
+    }
+
+    private void drawChannelDescriptionTooltip(String candidate) {
+        List<String> tooltip = tooltipSplitCache.computeIfAbsent(candidate, this::getChannelDescriptionTooltip);
+        drawHoveringText(tooltip, guiLeft + 151 + 12, guiTop + 122, fontRendererObj);
+    }
+
+    private List<String> getChannelDescriptionTooltip(String candidate) {
+        List<String> tooltip = new ArrayList<>();
+        int maxLine = width - (guiLeft + 151 + 12) - 12;
+        for (Entry<String, String> e : ChannelDescription.get(candidate).getDescriptions().entrySet()) {
+            tooltip.addAll(
+                    fontRendererObj.listFormattedStringToWidth(
+                            StatCollector.translateToLocalFormatted(
+                                    I18N_PREFIX + "channels.from",
+                                    Loader.instance().getIndexedModList().get(e.getKey()).getName()),
+                            maxLine));
+            tooltip.addAll(
+                    fontRendererObj.listFormattedStringToWidth(StatCollector.translateToLocal(e.getValue()), maxLine));
+        }
+        return tooltip;
+    }
+
+    public String trim(String str, int keyMaxWidth) {
+        Map<String, String> cache = trimCache.get(keyMaxWidth);
+        if (cache == null) {
+            trimCache.put(keyMaxWidth, cache = new HashMap<>());
+        }
+        return cache.computeIfAbsent(str, e -> {
+            String s = fontRendererObj.trimStringToWidth(e, keyMaxWidth);
+            if (s.length() != e.length()) {
+                StringBuilder buffer = new StringBuilder(s).deleteCharAt(s.length() - 1).append("...");
+                while ((s = fontRendererObj.trimStringToWidth(buffer.toString(), keyMaxWidth)).length()
+                        != buffer.length())
+                    // drop last original char
+                    buffer.deleteCharAt(s.length() - 4);
+                do {
+                    buffer.append('.');
+                } while (fontRendererObj.getStringWidth(buffer.toString()) <= keyMaxWidth);
+                s = buffer.deleteCharAt(s.length() - 1).insert(s.length() - 3, EnumChatFormatting.GRAY).toString();
+            }
+            return s;
+        });
+    }
+
+    @Override
+    @Optional.Method(modid = "NotEnoughItems")
+    public VisiblityData modifyVisiblity(GuiContainer gui, VisiblityData currentVisibility) {
+        return null;
+    }
+
+    @Override
+    public Iterable<Integer> getItemSpawnSlots(GuiContainer gui, ItemStack item) {
+        return Collections.emptyList();
+    }
+
+    @Override
+    public List<TaggedInventoryArea> getInventoryAreas(GuiContainer gui) {
+        return Collections.emptyList();
+    }
+
+    @Override
+    public boolean handleDragNDrop(GuiContainer gui, int mousex, int mousey, ItemStack draggedStack, int button) {
+        if (button != 0 || mousex <= guiLeft
+                || mousey <= guiTop
+                || mousex >= guiLeft + getXSize()
+                || mousey >= guiTop + getYSize()) {
+            return false;
+        }
+        Collection<Entry<String, Integer>> channels = ChannelDescription.iterate(draggedStack);
+        switch (channels.size()) {
+            case 0:
+                return false;
+            case 1:
+            default: // TODO implement a GUI to select which pair to use, instead of blindly using the first
+                Entry<String, Integer> e = channels.iterator().next();
+                ChannelDataAccessor.setChannelData(trigger, e.getKey(), e.getValue());
+                key.setText(e.getKey());
+                value.setText(e.getValue().toString());
+                draggedStack.stackSize = 0;
+                return true;
+        }
+    }
+
+    @Override
+    public boolean hideItemPanelSlot(GuiContainer gui, int x, int y, int w, int h) {
+        return false;
+    }
+
+    private class GuiAutoCompleteList extends GuiScrollableList<String> {
+
+        private List<Entry<String, String>> cache; // <key, display string>
+
+        public GuiAutoCompleteList(int width, int height, int originX, int originY, int slotHeight) {
+            super(width, height, originX, originY, slotHeight);
+            margin = 2;
+        }
+
+        private List<Entry<String, String>> getOptions() {
+            if (cache == null) {
+                cache = search();
+            }
+            return cache;
+        }
+
+        private List<Entry<String, String>> search() {
+            List<Entry<String, String>> cache = new ArrayList<>();
+            Set<String> added = new HashSet<>();
+            String term = key.getText();
+            String[] subjects = ChannelDescription.getAll().keySet().toArray(new String[0]);
+            Arrays.sort(subjects);
+            if (StringUtils.isBlank(term)) {
+                // nothing. just gives out everything
+                for (String subject : subjects) {
+                    cache.add(new AbstractMap.SimpleImmutableEntry<>(subject, EnumChatFormatting.GRAY + subject));
+                }
+                return cache;
+            }
+            // prefix match
+            for (String s : subjects) {
+                if (s.startsWith(term)) {
+                    cache.add(
+                            new AbstractMap.SimpleImmutableEntry<>(
+                                    s,
+                                    term + EnumChatFormatting.GRAY + s.substring(term.length())));
+                    added.add(s);
+                }
+            }
+            // subsequence match
+            for (String subject : subjects) {
+                if (!added.contains(subject) && subject.length() > term.length()) {
+                    int i = 0, j = 0;
+                    StringBuilder sb = new StringBuilder();
+                    boolean mode = true;
+                    sb.append(EnumChatFormatting.WHITE);
+                    while (i < term.length() && j < subject.length()) {
+                        if (term.codePointAt(i) == subject.codePointAt(j)) {
+                            if (!mode) {
+                                sb.append(EnumChatFormatting.WHITE);
+                                mode = true;
+                            }
+                            sb.appendCodePoint(term.codePointAt(i));
+                            i++;
+                            j++;
+                        } else {
+                            if (mode) {
+                                sb.append(EnumChatFormatting.GRAY);
+                                mode = false;
+                            }
+                            sb.appendCodePoint(subject.codePointAt(j));
+                            j++;
+                        }
+                    }
+                    if (i == term.length()) {
+                        if (j < subject.length()) {
+                            sb.append(EnumChatFormatting.GRAY);
+                            sb.append(subject, j, subject.length());
+                        }
+                        cache.add(new AbstractMap.SimpleImmutableEntry<>(subject, sb.toString()));
+                        added.add(subject);
+                    }
+                }
+            }
+            return cache;
+        }
+
+        public void reset() {
+            cache = search();
+            selectedIndex = cache.isEmpty() ? -1 : 0;
+            resetScroll();
+        }
+
+        @Override
+        public String getElementAt(int index) {
+            return index >= 0 && index < cache.size() ? getOptions().get(index).getKey() : null;
+        }
+
+        @Override
+        public int getNumElements() {
+            return getOptions().size();
+        }
+
+        @Override
+        protected void drawElement(int elementIndex, int x, int y, int height, Tessellator tessellator,
+                boolean isHovering) {
+            int color = elementIndex == selectedIndex ? 0xffffff : 0xcccccc;
+            fontRendererObj.drawString(getOptions().get(elementIndex).getValue(), x + margin, y + margin / 2, color);
+        }
+    }
+
     private class GuiChannelsList extends GuiScrollableList<Entry<String, Integer>> {
 
         private List<Entry<String, Integer>> cache;
@@ -350,6 +641,7 @@ public class GuiScreenConfigureChannels extends GuiScreen implements IGuiScreen
                 Entry<String, Integer> e = getElementAt(elementIndex);
                 if (e != null) {
                     ChannelDataAccessor.unsetChannelData(trigger, e.getKey());
+                    updateButtons();
                     return false;
                 }
             }
@@ -390,22 +682,5 @@ public class GuiScreenConfigureChannels extends GuiScreen implements IGuiScreen
             // args x1, y1, y2, color
             drawVerticalLine(minX + margin + margin / 2 + KEY_MAX_WIDTH * 2, minY + 1, maxY - 1, 0xffaaaaaa);
         }
-
-        public String trim(String e, int keyMaxWidth) {
-            // TODO optimize this to not create a billion string, or maybe cache this
-            String s = fontRendererObj.trimStringToWidth(e, keyMaxWidth);
-            if (s.length() != e.length()) {
-                StringBuilder buffer = new StringBuilder(s).deleteCharAt(s.length() - 1).append("...");
-                while ((s = fontRendererObj.trimStringToWidth(buffer.toString(), keyMaxWidth)).length()
-                        != buffer.length())
-                    // drop last original char
-                    buffer.deleteCharAt(s.length() - 4);
-                do {
-                    buffer.append('.');
-                } while (fontRendererObj.getStringWidth(buffer.toString()) <= keyMaxWidth);
-                s = buffer.deleteCharAt(s.length() - 1).insert(s.length() - 3, EnumChatFormatting.GRAY).toString();
-            }
-            return s;
-        }
     }
 }

src/main/java/com/gtnewhorizon/structurelib/gui/GuiScrollableList.java

@@ -16,7 +16,7 @@ import org.lwjgl.opengl.GL11;
  * <p>
  * As the code has been released into public domain, it is now LGPL as part of this library as a whole. You can go to
  * EnderCore's repository to obtain a public domain copy though
- *
+ * <p>
  * Major edits
  * <ul>
  * <li>Separate dwheel handling to handleDWheel. The next event calls often cause the mouse click event to not fire on
@@ -167,10 +167,17 @@ public abstract class GuiScrollableList<T> {
         }
     }
 
+    protected void resetScroll() {
+        amountScrolled = 0;
+    }
+
     /**
      * draws the slot to the screen, pass in mouse's current x and y and partial ticks
      */
     public void drawScreen(int mX, int mY, float partialTick) {
+        GL11.glPushMatrix();
+        GL11.glLoadIdentity();
+        GL11.glTranslatef(0.0F, 0.0F, -2000.0F);
         this.mouseX = mX;
         this.mouseY = mY;
 
@@ -199,13 +206,26 @@ public abstract class GuiScrollableList<T> {
         int contentYOffset = this.minY + margin - amountScrolled;
 
         boolean hoveringPrecondition = mX >= minX && mX <= maxX && mY >= minY && mY <= maxY;
+        int slotHeight = this.slotHeight - margin;
+
+        if (selectedIndex != -1) {
+            int elementY = contentYOffset + selectedIndex * this.slotHeight;
+            if (elementY + slotHeight > maxY) {
+                this.amountScrolled = (selectedIndex + 1) * this.slotHeight - this.height + margin;
+                amountScrolled = (int) this.amountScrolled;
+                contentYOffset = this.minY + margin - amountScrolled;
+            } else if (elementY < minY) {
+                this.amountScrolled = selectedIndex * this.slotHeight;
+                amountScrolled = (int) this.amountScrolled;
+                contentYOffset = this.minY + margin - amountScrolled;
+            }
+        }
 
         prepareDrawElements();
 
         for (int i = 0; i < getNumElements(); ++i) {
 
             int elementY = contentYOffset + i * this.slotHeight;
-            int slotHeight = this.slotHeight - margin;
 
             if (elementY <= maxY && elementY + slotHeight >= minY) {
 
@@ -264,6 +284,7 @@ public abstract class GuiScrollableList<T> {
         GL11.glShadeModel(GL11.GL_FLAT);
         GL11.glEnable(GL11.GL_ALPHA_TEST);
         GL11.glDisable(GL11.GL_BLEND);
+        GL11.glPopMatrix();
     }
 
     protected void prepareDrawElements() {}
@@ -412,7 +433,7 @@ public abstract class GuiScrollableList<T> {
         GL11.glColor4f(1.0F, 1.0F, 1.0F, 1.0F);
         GL11.glDisable(GL11.GL_TEXTURE_2D);
         tess.startDrawingQuads();
-        tess.setColorOpaque_I(2105376);
+        tess.setColorOpaque_I(0x202020);
         tess.addVertex(minX, maxY, 0.0D);
         tess.addVertex(maxX, maxY, 0.0D);
         tess.addVertex(maxX, minY, 0.0D);

src/main/java/com/gtnewhorizon/structurelib/item/ItemBlockHint.java

@@ -21,10 +21,9 @@ public class ItemBlockHint extends ItemBlock {
     }
 
     @Override
-    @SuppressWarnings("unchecked")
-    public void addInformation(ItemStack aStack, EntityPlayer aPlayer, List aList, boolean aF3_H) {
-        aList.add(translateToLocal("structurelib.blockhint.desc.0")); // Helps while building
-        switch (aStack.getItemDamage()) {
+    public void addInformation(ItemStack stack, EntityPlayer player, List<String> tooltip, boolean adv) {
+        tooltip.add(translateToLocal("structurelib.blockhint.desc.0")); // Helps while building
+        switch (stack.getItemDamage()) {
             case 0:
             case 1:
             case 2:
@@ -37,35 +36,36 @@ public class ItemBlockHint extends ItemBlock {
             case 9:
             case 10:
             case 11:
-                aList.add(
+                // Placeholder for a certain group.
+                tooltip.add(
                         EnumChatFormatting.AQUA.toString() + EnumChatFormatting.BOLD
-                                + translateToLocal("structurelib.blockhint.desc.1")); // Placeholder for a certain
-                                                                                      // group.
+                                + translateToLocal("structurelib.blockhint.desc.1"));
                 break;
             case 12:
-                aList.add(
+                // General placeholder.
+                tooltip.add(
                         EnumChatFormatting.AQUA.toString() + EnumChatFormatting.BOLD
-                                + translateToLocal("structurelib.blockhint.desc.2")); // General placeholder.
+                                + translateToLocal("structurelib.blockhint.desc.2"));
                 break;
             case 13:
-                aList.add(
+                // Make sure it contains Air material.
+                tooltip.add(
                         EnumChatFormatting.AQUA.toString() + EnumChatFormatting.BOLD
-                                + translateToLocal("structurelib.blockhint.desc.3")); // Make sure it contains Air
-                                                                                      // material.
+                                + translateToLocal("structurelib.blockhint.desc.3"));
                 break;
             case 14:
-                aList.add(
+                // Make sure it does not contain Air material.
+                tooltip.add(
                         EnumChatFormatting.AQUA.toString() + EnumChatFormatting.BOLD
-                                + translateToLocal("structurelib.blockhint.desc.4")); // Make sure it does not contain
-                                                                                      // Air material.
+                                + translateToLocal("structurelib.blockhint.desc.4"));
                 break;
             case 15:
-                aList.add(EnumChatFormatting.BLUE + translateToLocal("structurelib.blockhint.desc.5")); // ERROR, what
-                                                                                                        // did u expect?
+                // ERROR, what did u expect?
+                tooltip.add(EnumChatFormatting.BLUE + translateToLocal("structurelib.blockhint.desc.5"));
                 break;
             default: // WTF?
-                aList.add("Damn son where did you get that!?");
-                aList.add(EnumChatFormatting.BLUE + "From outer space... I guess...");
+                tooltip.add("Damn son where did you get that!?");
+                tooltip.add(EnumChatFormatting.BLUE + "From outer space... I guess...");
         }
     }
 

src/main/java/com/gtnewhorizon/structurelib/item/ItemConstructableTrigger.java

@@ -28,8 +28,14 @@ public class ItemConstructableTrigger extends Item {
 
     @Override
     public ItemStack onItemRightClick(ItemStack stack, World world, EntityPlayer player) {
-        if (world.isRemote && getMovingObjectPositionFromPlayer(world, player, true) == null)
-            player.openGui(StructureLib.instance(), 0, world, player.inventory.currentItem, 0, 0);
+        if (getMovingObjectPositionFromPlayer(world, player, true) == null) {
+            // channel gui is opened from server and config gui from client
+            if (!world.isRemote && !player.isSneaking()) {
+                player.openGui(StructureLib.instance(), 0, world, player.inventory.currentItem, 0, 0);
+            } else if (world.isRemote && player.isSneaking()) {
+                StructureLib.instance().proxy().displayConfigGUI("registries");
+            }
+        }
         return super.onItemRightClick(stack, world, player);
     }
 
@@ -39,31 +45,30 @@ public class ItemConstructableTrigger extends Item {
         return ConstructableUtility.handle(stack, player, world, x, y, z, side);
     }
 
-    @SuppressWarnings("unchecked")
     @Override
-    public void addInformation(ItemStack aStack, EntityPlayer ep, List aList, boolean boo) {
+    public void addInformation(ItemStack stack, EntityPlayer player, List<String> tooltip, boolean adv) {
         if (Keyboard.isKeyDown(Keyboard.KEY_LSHIFT)) {
-            aList.add(
+            tooltip.add(
                     translateToLocalFormatted(
                             "item.structurelib.constructableTrigger.desc.lshift.0",
-                            ChannelDataAccessor.countChannelData(aStack)));
-            ChannelDataAccessor.iterateChannelData(aStack).map(e -> e.getKey() + ": " + e.getValue())
-                    .forEach(aList::add);
+                            ChannelDataAccessor.countChannelData(stack)));
+            ChannelDataAccessor.iterateChannelData(stack).map(e -> e.getKey() + ": " + e.getValue())
+                    .forEach(tooltip::add);
         } else {
-            aList.add(translateToLocal("item.structurelib.constructableTrigger.desc.0")); // Triggers Constructable
-                                                                                          // Interface
-            aList.add(BLUE + translateToLocal("item.structurelib.constructableTrigger.desc.1")); // Shows multiblock
-                                                                                                 // construction
-                                                                                                 // details,
-            aList.add(BLUE + translateToLocal("item.structurelib.constructableTrigger.desc.2")); // just Use on a
-                                                                                                 // multiblock
-                                                                                                 // controller.
-            aList.add(BLUE + translateToLocal("item.structurelib.constructableTrigger.desc.3")); // (Sneak Use in
-                                                                                                 // creative to build)
-            aList.add(BLUE + translateToLocal("item.structurelib.constructableTrigger.desc.4")); // Quantity affects
-                                                                                                 // tier/mode/type
-            if (ChannelDataAccessor.hasSubChannel(aStack))
-                aList.add(translateToLocal("item.structurelib.constructableTrigger.desc.5"));
+            // Tooltip text:
+            // Triggers Constructable Interface
+            // Shows multiblock construction details,
+            // just Use on a multiblock controller.
+            // (Sneak Use in creative to build)
+            // Quantity affects tier/mode/type
+
+            tooltip.add(translateToLocal("item.structurelib.constructableTrigger.desc.0"));
+            tooltip.add(BLUE + translateToLocal("item.structurelib.constructableTrigger.desc.1"));
+            tooltip.add(BLUE + translateToLocal("item.structurelib.constructableTrigger.desc.2"));
+            tooltip.add(BLUE + translateToLocal("item.structurelib.constructableTrigger.desc.3"));
+            tooltip.add(BLUE + translateToLocal("item.structurelib.constructableTrigger.desc.4"));
+            if (ChannelDataAccessor.hasSubChannel(stack))
+                tooltip.add(translateToLocal("item.structurelib.constructableTrigger.desc.5"));
         }
     }
 }

src/main/java/com/gtnewhorizon/structurelib/item/ItemDebugConstructableTrigger.java

@@ -0,0 +1,14 @@
+package com.gtnewhorizon.structurelib.item;
+
+import static com.gtnewhorizon.structurelib.StructureLibAPI.MOD_ID;
+
+/**
+ * Hologram projector that always performs a creative build, whatever the player's game mode.
+ */
+public class ItemDebugConstructableTrigger extends ItemConstructableTrigger {
+
+    public ItemDebugConstructableTrigger() {
+        setUnlocalizedName("structurelib.debugConstructableTrigger");
+        setTextureName(MOD_ID + ":itemDebugConstructableTrigger");
+    }
+}

src/main/java/com/gtnewhorizon/structurelib/item/ItemFrontRotationTool.java

@@ -34,15 +34,14 @@ public class ItemFrontRotationTool extends Item {
 
     @Override
     @SideOnly(Side.CLIENT)
-    public void addInformation(ItemStack p_77624_1_, EntityPlayer p_77624_2_, List aList, boolean p_77624_4_) {
-        aList.add(translateToLocal("item.structurelib.frontRotationTool.desc.0")); // Triggers Front Rotation Interface
-        aList.add(EnumChatFormatting.BLUE + translateToLocal("item.structurelib.frontRotationTool.desc.1")); // Rotates
-                                                                                                             // only the
-                                                                                                             // front
-                                                                                                             // panel,
-        aList.add(EnumChatFormatting.BLUE + translateToLocal("item.structurelib.frontRotationTool.desc.2")); // which
-                                                                                                             // allows
-                                                                                                             // structure
-                                                                                                             // rotation.
+    public void addInformation(ItemStack stack, EntityPlayer player, List<String> tooltip, boolean adv) {
+        // Tooltip Text:
+        // Triggers Front Rotation Interface
+        // Rotates only the front panel,
+        // which allows structure rotation.
+
+        tooltip.add(translateToLocal("item.structurelib.frontRotationTool.desc.0"));
+        tooltip.add(EnumChatFormatting.BLUE + translateToLocal("item.structurelib.frontRotationTool.desc.1"));
+        tooltip.add(EnumChatFormatting.BLUE + translateToLocal("item.structurelib.frontRotationTool.desc.2"));
     }
 }

src/main/java/com/gtnewhorizon/structurelib/mixins/TargetedMod.java

@@ -0,0 +1,30 @@
+package com.gtnewhorizon.structurelib.mixins;
+
+import cpw.mods.fml.common.Mod;
+
+public enum TargetedMod {
+
+    VANILLA("Minecraft", null);
+
+    /** The "name" in the {@link Mod @Mod} annotation */
+    public final String modName;
+    /** Class that implements the IFMLLoadingPlugin interface */
+    public final String coreModClass;
+    /** The "modid" in the {@link Mod @Mod} annotation */
+    public final String modId;
+
+    TargetedMod(String modName, String coreModClass) {
+        this(modName, coreModClass, null);
+    }
+
+    TargetedMod(String modName, String coreModClass, String modId) {
+        this.modName = modName;
+        this.coreModClass = coreModClass;
+        this.modId = modId;
+    }
+
+    @Override
+    public String toString() {
+        return "TargetedMod{modName='" + modName + "', coreModClass='" + coreModClass + "', modId='" + modId + "'}";
+    }
+}

src/main/java/com/gtnewhorizon/structurelib/mixins/early/MixinGuiContainer_PickChannel.java

@@ -0,0 +1,64 @@
+package com.gtnewhorizon.structurelib.mixins.early;
+
+import net.minecraft.client.Minecraft;
+import net.minecraft.client.gui.GuiScreen;
+import net.minecraft.client.gui.inventory.GuiContainer;
+import net.minecraft.entity.player.EntityPlayer;
+import net.minecraft.inventory.Slot;
+import net.minecraft.item.ItemStack;
+
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.gen.Invoker;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
+
+import com.gtnewhorizon.structurelib.ChannelPickHandler;
+import com.gtnewhorizon.structurelib.ChannelWipeConfirmation;
+import com.gtnewhorizon.structurelib.StructureLib;
+import com.gtnewhorizon.structurelib.item.ItemConstructableTrigger;
+
+import codechicken.nei.NEIClientConfig;
+import codechicken.nei.guihook.GuiContainerManager;
+import cpw.mods.fml.common.Loader;
+
+@Mixin(value = GuiContainer.class, priority = 100)
+public abstract class MixinGuiContainer_PickChannel {
+
+    @Inject(method = "mouseClicked(III)V", at = @At("HEAD"), cancellable = true)
+    private void slib$onMouseClicked(int mouseX, int mouseY, int mouseButton, CallbackInfo ci) {
+        if (mouseButton != 2) return;
+
+        EntityPlayer player = Minecraft.getMinecraft().thePlayer;
+        if (player == null) return;
+
+        ItemStack cursorStack = player.inventory.getItemStack();
+        if (cursorStack == null || !(cursorStack.getItem() instanceof ItemConstructableTrigger)) return;
+
+        // Sink middle click as soon as projector is picked up
+        ci.cancel();
+
+        ItemStack hoveredStack = null;
+        try {
+            Slot slot = slib$invokeGetSlotAtPosition(mouseX, mouseY);
+            if (slot != null) {
+                hoveredStack = slot.getStack();
+            }
+
+            // try NEI
+            if (hoveredStack == null && Loader.isModLoaded("NotEnoughItems") && !NEIClientConfig.isHidden()) {
+                hoveredStack = GuiContainerManager.getStackMouseOver((GuiContainer) (Object) this);
+            }
+        } catch (Exception e) {
+            StructureLib.LOGGER.error("Error while resolving hovered slot for channel pick", e);
+        }
+
+        boolean isSneaking = GuiScreen.isShiftKeyDown();
+        if (isSneaking && !ChannelWipeConfirmation.confirm(player)) return;
+
+        ChannelPickHandler.handleMiddleClick(player, cursorStack, hoveredStack, isSneaking);
+    }
+
+    @Invoker("getSlotAtPosition")
+    protected abstract Slot slib$invokeGetSlotAtPosition(int x, int y);
+}

src/main/java/com/gtnewhorizon/structurelib/mixins/early/blockChangeNotifier/MixinForgeHooks.java

@@ -0,0 +1,44 @@
+package com.gtnewhorizon.structurelib.mixins.early.blockChangeNotifier;
+
+import net.minecraft.block.Block;
+import net.minecraft.entity.player.EntityPlayer;
+import net.minecraft.item.ItemStack;
+import net.minecraft.world.World;
+import net.minecraftforge.common.ForgeHooks;
+import net.minecraftforge.common.util.BlockSnapshot;
+
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfoReturnable;
+
+import com.gtnewhorizon.structurelib.event.BlockChangeNotifier;
+import com.llamalad7.mixinextras.sugar.Local;
+
+@Mixin(ForgeHooks.class)
+public class MixinForgeHooks {
+
+    @Inject(
+            method = "onPlaceItemIntoWorld",
+            at = @At(
+                    value = "INVOKE",
+                    target = "Lnet/minecraft/world/World;markAndNotifyBlock(IIILnet/minecraft/world/chunk/Chunk;Lnet/minecraft/block/Block;Lnet/minecraft/block/Block;I)V",
+                    shift = At.Shift.AFTER),
+            remap = false)
+    private static void onBlockChange(ItemStack itemstack, EntityPlayer player, World world, int x, int y, int z,
+            int side, float hitX, float hitY, float hitZ, CallbackInfoReturnable<Boolean> cir,
+            @Local(name = "blocksnapshot") BlockSnapshot blocksnapshot, @Local(name = "newBlock") Block newBlock,
+            @Local(name = "metadata") int newMetadata) {
+        BlockChangeNotifier.onBlockChange(
+                world,
+                null,
+                blocksnapshot.x,
+                blocksnapshot.y,
+                blocksnapshot.z,
+                blocksnapshot.replacedBlock,
+                newBlock,
+                blocksnapshot.meta,
+                newMetadata);
+    }
+
+}

src/main/java/com/gtnewhorizon/structurelib/mixins/early/blockChangeNotifier/MixinWorld.java

@@ -0,0 +1,55 @@
+package com.gtnewhorizon.structurelib.mixins.early.blockChangeNotifier;
+
+import net.minecraft.block.Block;
+import net.minecraft.world.World;
+import net.minecraft.world.chunk.Chunk;
+
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfoReturnable;
+
+import com.gtnewhorizon.structurelib.event.BlockChangeNotifier;
+import com.llamalad7.mixinextras.sugar.Local;
+import com.llamalad7.mixinextras.sugar.Share;
+import com.llamalad7.mixinextras.sugar.ref.LocalIntRef;
+import com.llamalad7.mixinextras.sugar.ref.LocalRef;
+
+@Mixin(World.class)
+public class MixinWorld {
+
+    @Inject(
+            method = "Lnet/minecraft/world/World;setBlock(IIILnet/minecraft/block/Block;II)Z",
+            at = @At(
+                    value = "INVOKE",
+                    target = "Lnet/minecraft/world/World;markAndNotifyBlock(IIILnet/minecraft/world/chunk/Chunk;Lnet/minecraft/block/Block;Lnet/minecraft/block/Block;I)V",
+                    shift = At.Shift.AFTER,
+                    remap = false))
+    public void setBlockObserve(int x, int y, int z, Block newBlock, int newMeta, int flags,
+            CallbackInfoReturnable<Boolean> cir, @Local(name = "block1") Block originalBlock,
+            @Share("originalMeta") LocalIntRef originalMeta, @Share("chunk") LocalRef<Chunk> chunkLocalRef) {
+        BlockChangeNotifier.onBlockChange(
+                (World) ((Object) (this)),
+                chunkLocalRef.get(),
+                x,
+                y,
+                z,
+                originalBlock,
+                newBlock,
+                originalMeta.get(),
+                newMeta);
+    }
+
+    @Inject(
+            method = "Lnet/minecraft/world/World;setBlock(IIILnet/minecraft/block/Block;II)Z",
+            at = @At(
+                    value = "INVOKE",
+                    target = "Lnet/minecraft/world/chunk/Chunk;func_150807_a(IIILnet/minecraft/block/Block;I)Z",
+                    shift = At.Shift.BEFORE))
+    public void captureChunkAndOriginalMetadata(int x, int y, int z, Block blockIn, int metadataIn, int flags,
+            CallbackInfoReturnable<Boolean> cir, @Local(name = "chunk") Chunk chunk,
+            @Share("originalMeta") LocalIntRef originalMeta, @Share("chunk") LocalRef<Chunk> chunkLocalRef) {
+        chunkLocalRef.set(chunk);
+        originalMeta.set(chunk.getBlockMetadata(x & 15, y, z & 15));
+    }
+}

src/main/java/com/gtnewhorizon/structurelib/net/RegistryOrderSyncMessage.java

@@ -0,0 +1,77 @@
+package com.gtnewhorizon.structurelib.net;
+
+import java.lang.ref.WeakReference;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.concurrent.ConcurrentHashMap;
+
+import com.gtnewhorizon.structurelib.SortedRegistry;
+
+import cpw.mods.fml.common.network.ByteBufUtils;
+import cpw.mods.fml.common.network.simpleimpl.IMessage;
+import cpw.mods.fml.common.network.simpleimpl.IMessageHandler;
+import cpw.mods.fml.common.network.simpleimpl.MessageContext;
+import io.netty.buffer.ByteBuf;
+
+public class RegistryOrderSyncMessage implements IMessage {
+
+    private String name;
+    private List<String> order;
+    private List<String> disabled;
+
+    public RegistryOrderSyncMessage() {}
+
+    public RegistryOrderSyncMessage(String name, List<String> order, List<String> disabled) {
+        this.name = name;
+        this.order = order;
+        this.disabled = disabled;
+    }
+
+    @Override
+    public void fromBytes(ByteBuf buf) {
+        name = ByteBufUtils.readUTF8String(buf);
+        int size = ByteBufUtils.readVarInt(buf, 2);
+        order = new ArrayList<>(size);
+        for (int i = 0; i < size; i++) {
+            order.add(ByteBufUtils.readUTF8String(buf));
+        }
+        size = ByteBufUtils.readVarInt(buf, 2);
+        disabled = new ArrayList<>(size);
+        for (int i = 0; i < size; i++) {
+            disabled.add(ByteBufUtils.readUTF8String(buf));
+        }
+    }
+
+    @Override
+    public void toBytes(ByteBuf buf) {
+        ByteBufUtils.writeUTF8String(buf, name);
+        ByteBufUtils.writeVarInt(buf, order.size(), 2);
+        for (String s : order) {
+            ByteBufUtils.writeUTF8String(buf, s);
+        }
+        ByteBufUtils.writeVarInt(buf, disabled.size(), 2);
+        for (String s : disabled) {
+            ByteBufUtils.writeUTF8String(buf, s);
+        }
+    }
+
+    public static class Handler implements IMessageHandler<RegistryOrderSyncMessage, IMessage> {
+
+        private static ConcurrentHashMap<String, WeakReference<SortedRegistry<?>>> ALL_REGISTRIES;
+
+        public static void setAllRegistries(ConcurrentHashMap<String, WeakReference<SortedRegistry<?>>> r) {
+            if (ALL_REGISTRIES == null) ALL_REGISTRIES = r;
+        }
+
+        @Override
+        public IMessage onMessage(RegistryOrderSyncMessage message, MessageContext ctx) {
+            if (ALL_REGISTRIES == null) return null;
+            WeakReference<SortedRegistry<?>> ref = ALL_REGISTRIES.get(message.name);
+            if (ref == null) return null;
+            SortedRegistry<?> r = ref.get();
+            if (r == null) return null;
+            r.registerOrdering(ctx.getServerHandler().playerEntity, message.order, message.disabled);
+            return null;
+        }
+    }
+}

src/main/java/com/gtnewhorizon/structurelib/net/SetChannelDataMessage.java

@@ -23,15 +23,22 @@ import io.netty.buffer.ByteBuf;
 public class SetChannelDataMessage implements IMessage {
 
     private final List<Map.Entry<String, Integer>> data = new ArrayList<>();
+    private boolean onCursor;
 
     public SetChannelDataMessage() {}
 
     public SetChannelDataMessage(ItemStack trigger) {
+        this(trigger, false);
+    }
+
+    public SetChannelDataMessage(ItemStack trigger, final boolean onCursor) {
+        this.onCursor = onCursor;
         ChannelDataAccessor.iterateChannelData(trigger).forEach(data::add);
     }
 
     @Override
     public void fromBytes(ByteBuf buf) {
+        onCursor = buf.readBoolean();
         data.clear();
         int size = ByteBufUtils.readVarShort(buf);
         for (int i = 0; i < size; i++) {
@@ -41,6 +48,7 @@ public class SetChannelDataMessage implements IMessage {
 
     @Override
     public void toBytes(ByteBuf buf) {
+        buf.writeBoolean(onCursor);
         ByteBufUtils.writeVarShort(buf, data.size());
         for (Entry<String, Integer> e : data) {
             ByteBufUtils.writeUTF8String(buf, e.getKey());
@@ -53,11 +61,11 @@ public class SetChannelDataMessage implements IMessage {
         @Override
         public IMessage onMessage(SetChannelDataMessage message, MessageContext ctx) {
             EntityPlayerMP player = ctx.getServerHandler().playerEntity;
-            ItemStack heldItem = player.getHeldItem();
-            if (heldItem != null && heldItem.getItem() instanceof ItemConstructableTrigger) {
-                ChannelDataAccessor.wipeChannelData(heldItem);
+            ItemStack target = message.onCursor ? player.inventory.getItemStack() : player.getHeldItem();
+            if (target != null && target.getItem() instanceof ItemConstructableTrigger) {
+                ChannelDataAccessor.wipeChannelData(target);
                 for (Entry<String, Integer> e : message.data) {
-                    ChannelDataAccessor.setChannelData(heldItem, e.getKey(), e.getValue());
+                    ChannelDataAccessor.setChannelData(target, e.getKey(), e.getValue());
                 }
                 // since this is a set all channel request from the client, we would assume client already know
                 // what this would look like on the client, so no sync
@@ -65,7 +73,7 @@ public class SetChannelDataMessage implements IMessage {
                 StructureLib.LOGGER.warn(
                         "{} trying to set channel data on {}, which is not a hologram projector!",
                         player.getUniqueID(),
-                        heldItem);
+                        target);
             }
             return null;
         }

src/main/java/com/gtnewhorizon/structurelib/structure/ChatThrottleKey.java

@@ -14,9 +14,7 @@ class ChatThrottleKey {
         @Override
         public boolean equals(Object o) {
             if (this == o) return true;
-            if (!(o instanceof NoExplicitChannel)) return false;
-
-            NoExplicitChannel that = (NoExplicitChannel) o;
+            if (!(o instanceof NoExplicitChannel that)) return false;
 
             return subchannel.equals(that.subchannel);
         }

src/main/java/com/gtnewhorizon/structurelib/structure/IChannelDefinition.java

@@ -0,0 +1,98 @@
+package com.gtnewhorizon.structurelib.structure;
+
+/**
+ * Describes a channel used by one structure definition.
+ *
+ * <p>
+ * Channel values are integers stored on the constructable trigger item. Implementations may override the default
+ * validation and normalization policy when a simple bounded range is not sufficient.
+ * </p>
+ */
+public interface IChannelDefinition {
+
+    /**
+     * Creates a channel with a bounded inclusive range and clamping normalization.
+     *
+     * @param channel      channel identifier
+     * @param minimumValue inclusive minimum value
+     * @param maximumValue inclusive maximum value
+     * @return bounded channel definition
+     */
+    static IChannelDefinition bounded(String channel, int minimumValue, int maximumValue) {
+        if (minimumValue < 1 || maximumValue < minimumValue) {
+            throw new IllegalArgumentException("Invalid channel bounds");
+        }
+        return new IChannelDefinition() {
+
+            @Override
+            public String getChannel() {
+                return channel;
+            }
+
+            @Override
+            public int getMinimumValue() {
+                return minimumValue;
+            }
+
+            @Override
+            public int getMaximumValue() {
+                return maximumValue;
+            }
+        };
+    }
+
+    /**
+     * Creates a channel accepting every positive integer.
+     *
+     * @param channel channel identifier
+     * @return unbounded channel definition
+     */
+    static IChannelDefinition unbounded(String channel) {
+        return () -> channel;
+    }
+
+    /**
+     * Returns the lower-case channel identifier.
+     *
+     * @return channel identifier
+     */
+    String getChannel();
+
+    /**
+     * Returns the smallest value advertised by this definition. The default is {@code 1}.
+     *
+     * @return minimum value
+     */
+    default int getMinimumValue() {
+        return 1;
+    }
+
+    /**
+     * Returns the largest value advertised by this definition. The default is {@link java.lang.Integer#MAX_VALUE}.
+     *
+     * @return maximum value
+     */
+    default int getMaximumValue() {
+        return Integer.MAX_VALUE;
+    }
+
+    /**
+     * Checks whether a value is already valid without normalization.
+     *
+     * @param value value to check
+     * @return true when the value is valid
+     */
+    default boolean isValueValid(int value) {
+        return value >= getMinimumValue() && value <= getMaximumValue();
+    }
+
+    /**
+     * Converts a stored value to the value used by the structure definition.
+     *
+     * @param value stored value
+     * @return normalized value
+     */
+    default int normalizeValue(int value) {
+        return Math.max(getMinimumValue(), Math.min(getMaximumValue(), value));
+    }
+}

src/main/java/com/gtnewhorizon/structurelib/structure/IStructureDefinition.java

@@ -3,6 +3,8 @@ package com.gtnewhorizon.structurelib.structure;
 import static com.gtnewhorizon.structurelib.structure.IStructureWalker.ignoreBlockUnloaded;
 import static com.gtnewhorizon.structurelib.structure.IStructureWalker.skipBlockUnloaded;
 
+import java.util.Collection;
+import java.util.Collections;
 import java.util.function.Function;
 
 import net.minecraft.entity.player.EntityPlayer;
@@ -12,6 +14,7 @@ import net.minecraft.world.World;
 
 import com.gtnewhorizon.structurelib.StructureLib;
 import com.gtnewhorizon.structurelib.StructureLibAPI;
+import com.gtnewhorizon.structurelib.alignment.constructable.ChannelDataAccessor;
 import com.gtnewhorizon.structurelib.alignment.constructable.ISurvivalConstructable;
 import com.gtnewhorizon.structurelib.alignment.enumerable.ExtendedFacing;
 
@@ -50,11 +53,53 @@ import com.gtnewhorizon.structurelib.alignment.enumerable.ExtendedFacing;
  * itself.</li>
  * <li>The "C" position would be the number of blocks between you and controller, not counting controller itself.</li>
  * </ul>
- * 
+ *
  * @param <T> Type of the context object. Usually this will be the multiblock controller.
  */
 public interface IStructureDefinition<T> {
 
+    /**
+     * Returns channel definitions declared by this structure.
+     *
+     * @return an immutable or otherwise read-only channel collection
+     */
+    default Collection<IChannelDefinition> getChannelDefinitions() {
+        return Collections.emptyList();
+    }
+
+    /**
+     * Returns channel definitions explicitly added by the structure builder.
+     *
+     * @return explicitly declared channel definitions
+     */
+    default Collection<IChannelDefinition> getExplicitChannelDefinitions() {
+        return getChannelDefinitions();
+    }
+
+    /**
+     * Finds a channel definition by identifier.
+     *
+     * @param channel channel identifier
+     * @return channel definition, or {@code null} when it is not declared
+     */
+    default IChannelDefinition getChannelDefinition(String channel) {
+        for (IChannelDefinition definition : getChannelDefinitions()) {
+            if (definition.getChannel().equals(channel)) return definition;
+        }
+        return null;
+    }
+
+    /**
+     * Reads one channel using the standard trigger-item channel semantics.
+     *
+     * @param trigger trigger item containing channel data
+     * @param channel channel identifier
+     * @return stored channel data, or the trigger stack size when absent
+     */
+    default int getChannelData(ItemStack trigger, String channel) {
+        return ChannelDataAccessor.getChannelData(trigger, channel);
+    }
+
     /**
      * Used internally
      * <p>
@@ -72,7 +117,7 @@ public interface IStructureDefinition<T> {
 
     /**
      * Run a structure check.
-     * 
+     *
      * @param object              context object. usually multiblock controller.
      * @param piece               the structure piece's string identifier.
      * @param world               the world object this check takes place in.
@@ -107,7 +152,7 @@ public interface IStructureDefinition<T> {
 
     /**
      * Spawn hint particles. Should not be called on server side.
-     * 
+     *
      * @param object         context object. usually multiblock controller.
      * @param piece          the structure piece's string identifier.
      * @param world          the world object this check takes place in.
@@ -318,9 +363,25 @@ public interface IStructureDefinition<T> {
         return walker.getBuilt();
     }
 
+    default void iterate(String piece, World world, ExtendedFacing extendedFacing, int basePositionX, int basePositionY,
+            int basePositionZ, int basePositionA, int basePositionB, int basePositionC, IStructureWalker<T> predicate) {
+        StructureUtility.iterateV2(
+                getStructureFor(piece),
+                world,
+                extendedFacing,
+                basePositionX,
+                basePositionY,
+                basePositionZ,
+                basePositionA,
+                basePositionB,
+                basePositionC,
+                predicate,
+                "customIterate");
+    }
+
     /**
      * Low level utility.
-     * 
+     *
      * @param object                                  context object. usually multiblock controller.
      * @param trigger                                 The trigger item that contains channel data.
      * @param elements                                the structure piece
@@ -394,6 +455,10 @@ public interface IStructureDefinition<T> {
                         basePositionC,
                         ignoreBlockUnloaded((e, w, x, y, z, a, b, c) -> {
                             e.spawnHint(object, world, x, y, z, trigger);
+                            if (ChannelDataAccessor.hasSubChannel(trigger, StructureLibAPI.CHANNEL_SHOW_ERROR)
+                                    && !e.couldBeValid(object, world, x, y, z, trigger)) {
+                                StructureLibAPI.markHintParticleError(StructureLib.getCurrentPlayer(), world, x, y, z);
+                            }
                             return true;
                         }),
                         "spawnHint");
@@ -420,7 +485,7 @@ public interface IStructureDefinition<T> {
 
     /**
      * Create a new instance of builder.
-     * 
+     *
      * @param <T> type of context object
      */
     static <T> StructureDefinition.Builder<T> builder() {

src/main/java/com/gtnewhorizon/structurelib/structure/IStructureElement.java

@@ -4,7 +4,9 @@ import static com.gtnewhorizon.structurelib.StructureLib.LOGGER;
 import static com.gtnewhorizon.structurelib.StructureLib.PANIC_MODE;
 
 import java.util.Arrays;
+import java.util.Collection;
 import java.util.Collections;
+import java.util.List;
 import java.util.function.Consumer;
 import java.util.function.Predicate;
 
@@ -32,6 +34,49 @@ public interface IStructureElement<T> {
 
     boolean check(T t, World world, int x, int y, int z);
 
+    /**
+     * Returns the channels used by this element.
+     *
+     * @return lower-case channel identifiers
+     */
+    default Collection<String> getChannels() {
+        return Collections.emptySet();
+    }
+
+    /**
+     * Pure (stateless and side effect free) function to test if current block could be valid. Used to give user hints
+     * about incorrectly placed blocks given a controller and trigger item. If couldBeValid(...) == false for a set of
+     * channels, with those same tiers, check(...) == false. Not required, defaults to true which is always safe but
+     * won't give the user error hints.
+     */
+    default boolean couldBeValid(T t, World world, int x, int y, int z, ItemStack trigger) {
+        return true;
+    }
+
+    /**
+     * Returns a human-readable description of what block(s) this element accepts. Used for diagnostic messages when
+     * structure checks fail (e.g. "expected Input Bus at (1, 2, 3)").
+     * <p>
+     * Unlike {@link #getBlocksToPlace}, which returns the full set of concrete block variants for autoplacing (e.g.
+     * every tier of Input Bus), this method returns <b>category-level</b> descriptions suitable for display to the
+     * player (e.g. just "Input Bus"). It also requires no parameters, no world, trigger item, or environment, making it
+     * usable in contexts where those are unavailable.
+     * <p>
+     * Implementations should return <b>lang keys</b> (e.g. {@code "tile.blockGlass.name"}) rather than pre-translated
+     * display names. The caller is responsible for translating these keys on the client side via
+     * {@code StatCollector.translateToLocal()}. If a key has no matching translation, {@code translateToLocal} returns
+     * the input string unchanged, so pre-translated fallback strings also work.
+     *
+     * @param context the context object (e.g. the multiblock controller), used to determine state-dependent
+     *                descriptions
+     * @return a list of accepted block descriptions as lang keys (or display names as fallback), or null if no
+     *         description is available
+     */
+    @Nullable
+    default List<String> getDescription(T context) {
+        return null;
+    }
+
     boolean spawnHint(T t, World world, int x, int y, int z, ItemStack trigger);
 
     boolean placeBlock(T t, World world, int x, int y, int z, ItemStack trigger);
@@ -61,7 +106,7 @@ public interface IStructureElement<T> {
                 "Default implementation of survivalPlaceBlock hit! Things aren't going to work well! IStructureElement class: {}",
                 getClass().getName());
         if (!StructureLibAPI.isBlockTriviallyReplaceable(world, x, y, z, actor)) return PlaceResult.REJECT;
-        return PlaceResult.SKIP;
+        return PlaceResult.REJECT_CONTINUE;
     }
 
     /**
@@ -171,7 +216,7 @@ public interface IStructureElement<T> {
         if (StructureLibAPI.isDebugEnabled()) LOGGER.info(
                 "Fallback shim code of survivalPlaceBlock hit! Things aren't going to work well! IStructureElement class: {}",
                 getClass().getName());
-        return PlaceResult.SKIP;
+        return PlaceResult.REJECT_CONTINUE;
     }
 
     /**
@@ -185,10 +230,21 @@ public interface IStructureElement<T> {
                 return IStructureElement.this.check(t, world, x, y, z);
             }
 
+            @Override
+            public boolean couldBeValid(T t, World world, int x, int y, int z, ItemStack trigger) {
+                return IStructureElement.this.couldBeValid(t, world, x, y, z, trigger);
+            }
+
             @Override
             public boolean spawnHint(T t, World world, int x, int y, int z, ItemStack trigger) {
                 return IStructureElement.this.spawnHint(t, world, x, y, z, trigger);
             }
+
+            @Nullable
+            @Override
+            public List<String> getDescription(T context) {
+                return IStructureElement.this.getDescription(context);
+            }
         };
     }
 
@@ -222,16 +278,21 @@ public interface IStructureElement<T> {
 
     enum PlaceResult {
         /**
-         * This element either exists already, or does not yet have an implementation for survivalPlaceBlock, or some
-         * other unforeseen situations. TODO this definition doesn't seem right. Should we separate SKIP from EXISTS, or
-         * SKIP from ERROR?
+         * The element's check passed, the position is already valid. No placement is needed. In the walker: continue
+         * iteration (no error, not counted as placed). In ofChain: short-circuits, remaining alternatives are skipped.
          */
         SKIP,
         /**
-         * This element's space is occupied by other stuff and require player attention, or player missing required
-         * resource, or the block cannot be placed due to obscure mechanisms, or some other unforeseen situations.
+         * The element cannot handle this position (occupied, missing resources, etc.). In the walker: stop iteration
+         * with error particles. In ofChain: try next alternative.
          */
         REJECT,
+        /**
+         * This element has no survivalPlaceBlock implementation (default fallback), or otherwise cannot place but is
+         * not an error condition. In the walker: continue iteration silently (like SKIP). In ofChain: try next
+         * alternative (like REJECT), so a better-suited element can handle it.
+         */
+        REJECT_CONTINUE,
         /**
          * Autoplace cannot proceed within this tick. To proceed further would require stopping the placement and wait
          * for next round.

src/main/java/com/gtnewhorizon/structurelib/structure/IStructureElementChain.java

@@ -1,7 +1,9 @@
 package com.gtnewhorizon.structurelib.structure;
 
 import java.util.ArrayList;
+import java.util.LinkedHashSet;
 import java.util.List;
+import java.util.Set;
 import java.util.function.Consumer;
 import java.util.function.Predicate;
 
@@ -31,6 +33,16 @@ public interface IStructureElementChain<T> extends IStructureElement<T> {
         return false;
     }
 
+    @Override
+    default boolean couldBeValid(T t, World world, int x, int y, int z, ItemStack trigger) {
+        for (IStructureElement<T> fallback : fallbacks()) {
+            if (fallback.couldBeValid(t, world, x, y, z, trigger)) {
+                return true;
+            }
+        }
+        return false;
+    }
+
     @Override
     default boolean spawnHint(T t, World world, int x, int y, int z, ItemStack trigger) {
         for (IStructureElement<T> fallback : fallbacks()) {
@@ -51,6 +63,19 @@ public interface IStructureElementChain<T> extends IStructureElement<T> {
         return false;
     }
 
+    @Nullable
+    @Override
+    default List<String> getDescription(T context) {
+        Set<String> descriptions = new LinkedHashSet<>();
+        for (IStructureElement<T> fallback : fallbacks()) {
+            List<String> desc = fallback.getDescription(context);
+            if (desc != null) {
+                descriptions.addAll(desc);
+            }
+        }
+        return descriptions.isEmpty() ? null : new ArrayList<>(descriptions);
+    }
+
     @Nullable
     @Override
     default BlocksToPlace getBlocksToPlace(T t, World world, int x, int y, int z, ItemStack trigger,
@@ -62,7 +87,8 @@ public interface IStructureElementChain<T> extends IStructureElement<T> {
             if (e == null) continue;
             if (predicate == null) predicate = e.getPredicate();
             else predicate = predicate.or(e.getPredicate());
-            is.add(e.getStacks());
+            Iterable<ItemStack> stacks = e.getStacks();
+            if (stacks != null) is.add(stacks);
         }
         if (predicate == null) return null;
         return new BlocksToPlace(predicate, Iterables.concat(is));
@@ -71,47 +97,51 @@ public interface IStructureElementChain<T> extends IStructureElement<T> {
     @Override
     default PlaceResult survivalPlaceBlock(T t, World world, int x, int y, int z, ItemStack trigger, IItemSource s,
             EntityPlayerMP actor, Consumer<IChatComponent> chatter) {
-        boolean haveSkip = false;
+        boolean allContinue = true;
         List<IChatComponent> bufferedNoise = new ArrayList<>();
         for (IStructureElement<T> fallback : fallbacks()) {
             PlaceResult result = fallback.survivalPlaceBlock(t, world, x, y, z, trigger, s, actor, bufferedNoise::add);
             switch (result) {
+                case REJECT_CONTINUE:
+                    break;
                 case REJECT:
+                    allContinue = false;
                     break;
                 case SKIP:
-                    haveSkip = true;
-                    break;
+                    bufferedNoise.forEach(chatter);
+                    return PlaceResult.SKIP;
                 default:
                     return result;
             }
         }
         // dump all that noise back into upstream
         bufferedNoise.forEach(chatter);
-        // TODO need reconsider to ensure this is the right course of action
-        return haveSkip ? PlaceResult.SKIP : PlaceResult.REJECT;
+        return allContinue ? PlaceResult.REJECT_CONTINUE : PlaceResult.REJECT;
     }
 
     @Override
     default PlaceResult survivalPlaceBlock(T t, World world, int x, int y, int z, ItemStack trigger,
             AutoPlaceEnvironment env) {
-        boolean haveSkip = false;
+        boolean allContinue = true;
         List<IChatComponent> bufferedNoise = new ArrayList<>();
         for (IStructureElement<T> fallback : fallbacks()) {
             PlaceResult result = fallback
                     .survivalPlaceBlock(t, world, x, y, z, trigger, env.withChatter(bufferedNoise::add));
             switch (result) {
+                case REJECT_CONTINUE:
+                    break;
                 case REJECT:
+                    allContinue = false;
                     break;
                 case SKIP:
-                    haveSkip = true;
-                    break;
+                    bufferedNoise.forEach(env.getChatter());
+                    return PlaceResult.SKIP;
                 default:
                     return result;
             }
         }
         // dump all that noise back into upstream
         bufferedNoise.forEach(env.getChatter());
-        // TODO need reconsider to ensure this is the right course of action
-        return haveSkip ? PlaceResult.SKIP : PlaceResult.REJECT;
+        return allContinue ? PlaceResult.REJECT_CONTINUE : PlaceResult.REJECT;
     }
 }

src/main/java/com/gtnewhorizon/structurelib/structure/IStructureElementCheckOnly.java

@@ -14,6 +14,11 @@ public interface IStructureElementCheckOnly<T> extends IStructureElement<T> {
         return false;
     }
 
+    @Override
+    default boolean couldBeValid(T t, World world, int x, int y, int z, ItemStack trigger) {
+        return true;
+    }
+
     @Override
     default boolean spawnHint(T t, World world, int x, int y, int z, ItemStack trigger) {
         return false;
@@ -22,12 +27,12 @@ public interface IStructureElementCheckOnly<T> extends IStructureElement<T> {
     @Override
     default PlaceResult survivalPlaceBlock(T t, World world, int x, int y, int z, ItemStack trigger, IItemSource s,
             EntityPlayerMP actor, Consumer<IChatComponent> chatter) {
-        return PlaceResult.SKIP;
+        return PlaceResult.REJECT_CONTINUE;
     }
 
     @Override
     default PlaceResult survivalPlaceBlock(T t, World world, int x, int y, int z, ItemStack trigger,
             AutoPlaceEnvironment env) {
-        return PlaceResult.SKIP;
+        return PlaceResult.REJECT_CONTINUE;
     }
 }

src/main/java/com/gtnewhorizon/structurelib/structure/IStructureNavigate.java

@@ -17,6 +17,11 @@ interface IStructureNavigate<T> extends IStructureElement<T> {
         return true;
     }
 
+    @Override
+    default boolean couldBeValid(T t, World world, int x, int y, int z, ItemStack trigger) {
+        return true;
+    }
+
     @Override
     default boolean spawnHint(T t, World world, int x, int y, int z, ItemStack trigger) {
         return true;

src/main/java/com/gtnewhorizon/structurelib/structure/IStructureWalker.java

@@ -2,8 +2,25 @@ package com.gtnewhorizon.structurelib.structure;
 
 import net.minecraft.world.World;
 
-interface IStructureWalker<T> {
+/**
+ * A functional interface that is used to iterate over an arbitrary structure.
+ */
+@FunctionalInterface
+public interface IStructureWalker<T> {
 
+    /**
+     * Called once per structure element.
+     *
+     * @param element The current element
+     * @param world   The current world
+     * @param x       The absolute X position of the element in world coordinates
+     * @param y       The absolute Y position of the element in world coordinates
+     * @param z       The absolute Z position of the element in world coordinates
+     * @param a       The relative A position of the element in structure-local coordinates (pre transform)
+     * @param b       The relative B position of the element in structure-local coordinates (pre transform)
+     * @param c       The relative C position of the element in structure-local coordinates (pre transform)
+     * @return False to stop iterating, true to continue.
+     */
     boolean visit(IStructureElement<T> element, World world, int x, int y, int z, int a, int b, int c);
 
     default boolean blockNotLoaded(IStructureElement<T> element, World world, int x, int y, int z, int a, int b,

src/main/java/com/gtnewhorizon/structurelib/structure/LazyStructureElement.java

@@ -1,5 +1,6 @@
 package com.gtnewhorizon.structurelib.structure;
 
+import java.util.List;
 import java.util.function.Consumer;
 import java.util.function.Function;
 
@@ -32,6 +33,11 @@ class LazyStructureElement<T> implements IStructureElementDeferred<T> {
         return get(t).check(t, world, x, y, z);
     }
 
+    @Override
+    public boolean couldBeValid(T t, World world, int x, int y, int z, ItemStack trigger) {
+        return get(t).couldBeValid(t, world, x, y, z, trigger);
+    }
+
     @Override
     public boolean placeBlock(T t, World world, int x, int y, int z, ItemStack trigger) {
         return get(t).placeBlock(t, world, x, y, z, trigger);
@@ -60,4 +66,10 @@ class LazyStructureElement<T> implements IStructureElementDeferred<T> {
             AutoPlaceEnvironment env) {
         return get(t).survivalPlaceBlock(t, world, x, y, z, trigger, env);
     }
+
+    @Nullable
+    @Override
+    public List<String> getDescription(T context) {
+        return elem != null ? elem.getDescription(context) : null;
+    }
 }

src/main/java/com/gtnewhorizon/structurelib/structure/StructureDefinition.java

@@ -1,8 +1,19 @@
 package com.gtnewhorizon.structurelib.structure;
 
-import static com.gtnewhorizon.structurelib.structure.StructureUtility.*;
+import static com.gtnewhorizon.structurelib.structure.StructureUtility.isAir;
+import static com.gtnewhorizon.structurelib.structure.StructureUtility.notAir;
+import static com.gtnewhorizon.structurelib.structure.StructureUtility.step;
 
-import java.util.*;
+import java.util.Arrays;
+import java.util.BitSet;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.Locale;
+import java.util.Map;
+import java.util.NoSuchElementException;
+import java.util.Set;
 import java.util.stream.Collectors;
 
 import com.gtnewhorizon.structurelib.util.Vec3Impl;
@@ -12,18 +23,28 @@ public class StructureDefinition<T> implements IStructureDefinition<T> {
     private final Map<Character, IStructureElement<T>> elements;
     private final Map<String, String> shapes;
     private final Map<String, IStructureElement<T>[]> structures;
-    private final Map<String, Set<Vec3Impl>> occupiedSpaces;
+    private final Map<String, OccupiedSpace> occupiedSpaces;
+    private final Map<String, IChannelDefinition> channelDefinitions;
+    private final Set<String> explicitChannels;
+    private final Collection<IChannelDefinition> channelDefinitionValues;
+    private final Collection<IChannelDefinition> explicitChannelDefinitions;
 
     public static <B> Builder<B> builder() {
         return new Builder<>();
     }
 
     private StructureDefinition(Map<Character, IStructureElement<T>> elements, Map<String, String> shapes,
-            Map<String, IStructureElement<T>[]> structures, Map<String, Set<Vec3Impl>> occupiedSpaces) {
+            Map<String, IStructureElement<T>[]> structures, Map<String, OccupiedSpace> occupiedSpaces,
+            Map<String, IChannelDefinition> channelDefinitions, Set<String> explicitChannels) {
         this.elements = elements;
         this.shapes = shapes;
         this.structures = structures;
         this.occupiedSpaces = occupiedSpaces;
+        this.channelDefinitions = Collections.unmodifiableMap(new HashMap<>(channelDefinitions));
+        this.explicitChannels = Collections.unmodifiableSet(new HashSet<>(explicitChannels));
+        this.channelDefinitionValues = Collections.unmodifiableCollection(this.channelDefinitions.values());
+        this.explicitChannelDefinitions = Collections.unmodifiableList(
+                this.explicitChannels.stream().map(this.channelDefinitions::get).collect(Collectors.toList()));
     }
 
     public static class Builder<T> {
@@ -35,13 +56,17 @@ public class StructureDefinition<T> implements IStructureDefinition<T> {
         private final Map<Vec3Impl, Character> navigates;
         private final Map<Character, IStructureElement<T>> elements;
         private final Map<String, String> shapes;
-        private final Map<String, Set<Vec3Impl>> occupiedSpaces;
+        private final Map<String, OccupiedSpace> occupiedSpaces;
+        private final Map<String, IChannelDefinition> channels;
+        private final Set<String> explicitChannels;
 
         private Builder() {
             navigates = new HashMap<>();
             elements = new HashMap<>();
             shapes = new HashMap<>();
             occupiedSpaces = new HashMap<>();
+            channels = new HashMap<>();
+            explicitChannels = new HashSet<>();
         }
 
         public Map<Character, IStructureElement<T>> getElements() {
@@ -88,7 +113,19 @@ public class StructureDefinition<T> implements IStructureDefinition<T> {
                 }
                 builder.setLength(builder.length() - 1);
             }
-            Set<Vec3Impl> occupiedSpace = new HashSet<>();
+            int sizeA = 0;
+            int sizeB = 0;
+            long occupiedCount = 0;
+            for (String[] strings : structurePiece) {
+                sizeB = Math.max(sizeB, strings.length);
+                for (String string : strings) {
+                    sizeA = Math.max(sizeA, string.length());
+                    for (int i = 0; i < string.length(); i++) {
+                        if (string.charAt(i) != ' ') occupiedCount++;
+                    }
+                }
+            }
+            OccupiedSpace occupiedSpace = new OccupiedSpace(sizeA, sizeB, structurePiece.length, occupiedCount);
             // these track the global current location
             int aa = 0, bb = 0, cc = 0;
             // these track the vec3 towards next meaningful element
@@ -102,7 +139,7 @@ public class StructureDefinition<T> implements IStructureDefinition<T> {
                 } else if (ch == '~') {
                     builder.setCharAt(i, A);
                     ch = A;
-                    occupiedSpace.add(Vec3Impl.getFromPool(aa, bb, cc));
+                    occupiedSpace.add(aa, bb, cc);
                 }
                 if (ch == A) {
                     aa++;
@@ -128,28 +165,45 @@ public class StructureDefinition<T> implements IStructureDefinition<T> {
                         addElement(navigate, step(vec3));
                     }
                     builder.setCharAt(i - 1, navigate);
-                    occupiedSpace.add(Vec3Impl.getFromPool(aa, bb, cc));
+                    occupiedSpace.add(aa, bb, cc);
                     aa++;
                     a = 0;
                     b = 0;
                     c = 0;
                 } else {
-                    occupiedSpace.add(Vec3Impl.getFromPool(aa, bb, cc));
+                    occupiedSpace.add(aa, bb, cc);
                     aa++;
                 }
             }
 
             occupiedSpaces.put(name, occupiedSpace);
 
-            String built = builder.toString().replaceAll("[\\uA000\\uB000\\uC000]", "");
+            boolean hasPlus = false;
+            boolean hasMinus = false;
 
-            if (built.contains("+")) {
+            int write = 0;
+            for (int read = 0; read < builder.length(); read++) {
+                char ch = builder.charAt(read);
+                if (ch == A || ch == B || ch == C) {
+                    continue;
+                }
+                if (ch == '+') {
+                    hasPlus = true;
+                } else if (ch == '-') {
+                    hasMinus = true;
+                }
+                if (read != write) builder.setCharAt(write, ch);
+                write++;
+            }
+            builder.setLength(write);
+
+            if (hasPlus) {
                 addElement('+', notAir());
             }
-            if (built.contains("-")) {
+            if (hasMinus) {
                 addElement('-', isAir());
             }
-            shapes.put(name, built);
+            shapes.put(name, builder.toString());
             return this;
         }
 
@@ -158,22 +212,61 @@ public class StructureDefinition<T> implements IStructureDefinition<T> {
          */
         @Deprecated
         public Builder<T> addElement(Character name, IStructureElement<T> structurePiece) {
-            elements.putIfAbsent(name, structurePiece);
+            if (elements.putIfAbsent(name, structurePiece) == null) registerElementChannel(structurePiece);
             return this;
         }
 
         public Builder<T> addElement(char name, IStructureElement<T> structurePiece) {
-            elements.putIfAbsent(name, structurePiece);
+            if (elements.putIfAbsent(name, structurePiece) == null) registerElementChannel(structurePiece);
             return this;
         }
 
+        public Builder<T> addChannel(IChannelDefinition definition) {
+            validateChannelDefinition(definition);
+            channels.put(definition.getChannel(), definition);
+            explicitChannels.add(definition.getChannel());
+            return this;
+        }
+
+        public Builder<T> addChannel(String channel, int minimumValue, int maximumValue) {
+            return addChannel(IChannelDefinition.bounded(channel, minimumValue, maximumValue));
+        }
+
+        private void registerElementChannel(IStructureElement<T> structurePiece) {
+            for (String channel : structurePiece.getChannels()) {
+                validateChannelName(channel);
+                if (!explicitChannels.contains(channel)) {
+                    channels.putIfAbsent(channel, IChannelDefinition.unbounded(channel));
+                }
+            }
+        }
+
+        private void validateChannelDefinition(IChannelDefinition definition) {
+            if (definition == null) throw new IllegalArgumentException("Channel definition cannot be null");
+            validateChannelName(definition.getChannel());
+            if (definition.getMinimumValue() < 1 || definition.getMaximumValue() < definition.getMinimumValue()) {
+                throw new IllegalArgumentException("Invalid channel definition values");
+            }
+        }
+
+        private void validateChannelName(String channel) {
+            if (channel == null || channel.isEmpty() || !channel.toLowerCase(Locale.ROOT).equals(channel)) {
+                throw new IllegalArgumentException("Channel name must be non-empty and lower case");
+            }
+        }
+
         public IStructureDefinition<T> build() {
+            for (IStructureElement<T> element : elements.values()) {
+                registerElementChannel(element);
+            }
             Map<String, IStructureElement<T>[]> structures = compileStructureMap();
             return new StructureDefinition<>(
                     new HashMap<>(elements),
                     new HashMap<>(shapes),
                     structures,
-                    occupiedSpaces);
+                    occupiedSpaces,
+                    channels,
+                    explicitChannels);
         }
 
         @SuppressWarnings("unchecked")
@@ -226,6 +319,21 @@ public class StructureDefinition<T> implements IStructureDefinition<T> {
         return structures;
     }
 
+    @Override
+    public Collection<IChannelDefinition> getChannelDefinitions() {
+        return channelDefinitionValues;
+    }
+
+    @Override
+    public Collection<IChannelDefinition> getExplicitChannelDefinitions() {
+        return explicitChannelDefinitions;
+    }
+
+    @Override
+    public IChannelDefinition getChannelDefinition(String channel) {
+        return channelDefinitions.get(channel);
+    }
+
     @Override
     public IStructureElement<T>[] getStructureFor(String name) {
         IStructureElement<T>[] elements = structures.get(name);
@@ -235,8 +343,49 @@ public class StructureDefinition<T> implements IStructureDefinition<T> {
 
     @Override
     public boolean isContainedInStructure(String name, int offsetA, int offsetB, int offsetC) {
-        Set<Vec3Impl> occupiedSpace = occupiedSpaces.get(name);
+        OccupiedSpace occupiedSpace = occupiedSpaces.get(name);
         if (occupiedSpace == null) throw new NoSuchElementException(name);
-        return occupiedSpace.contains(new Vec3Impl(offsetA, offsetB, offsetC));
+        return occupiedSpace.contains(offsetA, offsetB, offsetC);
+    }
+
+    private static class OccupiedSpace {
+
+        private final int sizeA;
+        private final int sizeB;
+        private final int sizeC;
+        private final BitSet occupied;
+        private final Set<Vec3Impl> sparseOccupied;
+
+        private OccupiedSpace(int sizeA, int sizeB, int sizeC, long occupiedCount) {
+            this.sizeA = sizeA;
+            this.sizeB = sizeB;
+            this.sizeC = sizeC;
+            long volume = (long) sizeA * sizeB * sizeC;
+            if (volume <= Integer.MAX_VALUE && volume <= Math.max(1024L, occupiedCount * 256L)) {
+                occupied = new BitSet((int) volume);
+                sparseOccupied = null;
+            } else {
+                occupied = null;
+                sparseOccupied = new HashSet<>();
+            }
+        }
+
+        private void add(int a, int b, int c) {
+            if (occupied != null) {
+                occupied.set(index(a, b, c));
+            } else {
+                sparseOccupied.add(new Vec3Impl(a, b, c));
+            }
+        }
+
+        private boolean contains(int a, int b, int c) {
+            if (a < 0 || b < 0 || c < 0 || a >= sizeA || b >= sizeB || c >= sizeC) return false;
+            if (occupied != null) return occupied.get(index(a, b, c));
+            return sparseOccupied.contains(new Vec3Impl(a, b, c));
+        }
+
+        private int index(int a, int b, int c) {
+            return (c * sizeB + b) * sizeA + a;
+        }
     }
 }

src/main/java/com/gtnewhorizon/structurelib/structure/SurvivalBuildStructureWalker.java

@@ -43,9 +43,10 @@ class SurvivalBuildStructureWalker<T> implements IStructureWalker<T> {
         env.offsetABC[2] = c;
         env.setSource(params.getSource());
         PlaceResult placeResult = element.survivalPlaceBlock(object, world, x, y, z, trigger, env);
-        if (placeResult != PlaceResult.SKIP && built == -1) built = 0;
+        if (placeResult != PlaceResult.SKIP && placeResult != PlaceResult.REJECT_CONTINUE && built == -1) built = 0;
         switch (placeResult) {
             case SKIP:
+            case REJECT_CONTINUE:
                 return true;
             case ACCEPT:
                 if (check) element.check(object, world, x, y, z);

src/main/java/com/gtnewhorizon/structurelib/util/InventoryUtility.java

@@ -1,20 +1,9 @@
-/**
- * Copyright (c) 2022, glee8e This file is part of StructureLib.
- * <p>
- * StructureLib is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General
- * Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any
- * later version.
- * <p>
- * StructureLib is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
- * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
- * details.
- * <p>
- * You should have received a copy of the GNU Lesser General Public License along with Foobar; if not, write to the Free
- * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- */
 package com.gtnewhorizon.structurelib.util;
 
-import java.util.*;
+import java.util.Arrays;
+import java.util.Iterator;
+import java.util.List;
+import java.util.Map;
 import java.util.concurrent.CopyOnWriteArrayList;
 import java.util.function.Function;
 import java.util.function.Predicate;
@@ -30,6 +19,7 @@ import net.minecraft.inventory.InventoryEnderChest;
 import net.minecraft.item.ItemStack;
 
 import com.gtnewhorizon.gtnhlib.util.map.ItemStackMap;
+import com.gtnewhorizon.structurelib.SortedRegistry;
 import com.gtnewhorizon.structurelib.util.InventoryUtility.ItemStackExtractor.APIType;
 import com.gtnewhorizon.structurelib.util.ItemStackPredicate.NBTMode;
 
@@ -38,12 +28,13 @@ import com.gtnewhorizon.structurelib.util.ItemStackPredicate.NBTMode;
  */
 public class InventoryUtility {
 
-    private static final SortedRegistry<ItemStackExtractor> stackExtractors = new SortedRegistry<>();
+    private static final SortedRegistry<ItemStackExtractor> stackExtractors = new SortedRegistry<>("stackExtractors");
     private static final List<Predicate<? super EntityPlayerMP>> enableEnder = new CopyOnWriteArrayList<>();
     /**
      * The remove() of the Iterable returned must be implemented!
      */
-    private static final SortedRegistry<InventoryProvider<?>> inventoryProviders = new SortedRegistry<>();
+    private static final SortedRegistry<InventoryProvider<?>> inventoryProviders = new SortedRegistry<>(
+            "inventoryProviders");
 
     static {
         inventoryProviders.register("5000-main-inventory", new InventoryProvider<InventoryIterable<InventoryPlayer>>() {
@@ -102,8 +93,8 @@ public class InventoryUtility {
         registerInventoryProvider(key, newInventoryProvider(extractor));
     }
 
-    public static Iterator<? extends ItemStackExtractor> getStackExtractors() {
-        return stackExtractors.iterator();
+    public static Iterator<? extends ItemStackExtractor> getStackExtractors(EntityPlayerMP player) {
+        return stackExtractors.getPlayerOrdering(player).iterator();
     }
 
     public static <Inv extends IInventory> InventoryProvider<InventoryIterable<Inv>> newInventoryProvider(
@@ -165,7 +156,7 @@ public class InventoryUtility {
             boolean simulate, int count) {
         ItemStackCounterImpl store = new ItemStackCounterImpl();
         int sum = 0;
-        for (InventoryProvider<?> provider : inventoryProviders) {
+        for (InventoryProvider<?> provider : inventoryProviders.getPlayerOrdering(player)) {
             sum += takeFromPlayer(player, predicate, simulate, count - sum, store, provider, null);
             if (sum >= count) return store.getStore();
         }
@@ -186,7 +177,7 @@ public class InventoryUtility {
         int count = filter.stackSize;
         ItemStackPredicate predicate = ItemStackPredicate.from(filter, NBTMode.EXACT);
         ItemStackCounterImpl store = new ItemStackCounterImpl();
-        for (InventoryProvider<?> provider : inventoryProviders) {
+        for (InventoryProvider<?> provider : inventoryProviders.getPlayerOrdering(player)) {
             sum += takeFromPlayer(player, predicate, simulate, count - sum, store, provider, filter);
             if (sum >= count) return sum;
         }
@@ -212,7 +203,7 @@ public class InventoryUtility {
      * @param predicate item stack filter
      * @param simulate  whether to do removal
      * @param count     let's hope int size is enough...
-     * @param recursive do recursive lookup using {@link #getStackExtractors() stack extractors}
+     * @param recursive do recursive lookup using {@link #getStackExtractors(EntityPlayerMP) stack extractors}
      * @return amount taken. never negative nor bigger than count...
      */
     public static Map<ItemStack, Integer> takeFromInventory(Iterable<ItemStack> inv, Predicate<ItemStack> predicate,
@@ -252,7 +243,9 @@ public class InventoryUtility {
                 if (found == count) return count;
             }
             if (!recursive) continue;
-            for (ItemStackExtractor f : stackExtractors) {
+            for (ItemStackExtractor f : stackExtractors.getPlayerOrdering(player)) {
+                boolean end = f.isAPIImplemented(APIType.IS_VALID_SOURCE);
+                if (!f.isValidSource(stack, player)) continue;
                 if (filter != null && f.isAPIImplemented(APIType.EXTRACT_ONE_STACK)) {
                     copiedFilter.stackSize = count - found;
                     found += f.getItem(stack, copiedFilter, simulate, player);
@@ -260,11 +253,16 @@ public class InventoryUtility {
                     found += f.takeFromStack(predicate, simulate, count - found, store, stack, filter, player);
                 }
                 if (found >= count) return found;
+                if (end) break;
             }
         }
         return found;
     }
 
+    public static void init() {
+        // dummy method to init static final fields
+    }
+
     public interface OptimizedExtractor {
 
         /**
@@ -294,10 +292,15 @@ public class InventoryUtility {
         enum APIType {
             MAIN,
             EXTRACT_ONE_STACK,
+            IS_VALID_SOURCE,
         }
 
         boolean isAPIImplemented(APIType type);
 
+        default boolean isValidSource(ItemStack is, EntityPlayerMP player) {
+            return true;
+        }
+
         /**
          * Extract a particular type of item. The extractor can choose to not return all items contained within this
          * item as long as it makes sense, but the author should inform the player of this.

src/main/java/com/gtnewhorizon/structurelib/util/ItemStackArrayIterable.java

@@ -1,41 +0,0 @@
-package com.gtnewhorizon.structurelib.util;
-
-import java.util.Iterator;
-
-import net.minecraft.item.ItemStack;
-
-public class ItemStackArrayIterable implements Iterable<ItemStack> {
-
-    private final ItemStack[] stacks;
-
-    public ItemStackArrayIterable(ItemStack[] stacks) {
-        this.stacks = stacks;
-    }
-
-    public ItemStack[] getStacks() {
-        return stacks;
-    }
-
-    @Override
-    public Iterator<ItemStack> iterator() {
-        return new Iterator<ItemStack>() {
-
-            private int ptr = 0;
-
-            @Override
-            public boolean hasNext() {
-                return ptr < stacks.length;
-            }
-
-            @Override
-            public ItemStack next() {
-                return stacks[ptr++];
-            }
-
-            @Override
-            public void remove() {
-                stacks[ptr - 1] = null;
-            }
-        };
-    }
-}

src/main/java/com/gtnewhorizon/structurelib/util/MiscUtils.java

@@ -11,7 +11,6 @@ public class MiscUtils {
 
     private MiscUtils() {}
 
-    @SuppressWarnings("unchecked")
     public static Set<String> getTagKeys(NBTTagCompound tag) {
         return tag.func_150296_c();
     }

src/main/java/com/gtnewhorizon/structurelib/util/SortedRegistry.java

@@ -1,6 +1,12 @@
 package com.gtnewhorizon.structurelib.util;
 
-import java.util.*;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.Iterator;
+import java.util.List;
+import java.util.NavigableMap;
+import java.util.Spliterator;
+import java.util.TreeMap;
 import java.util.function.Consumer;
 
 public class SortedRegistry<V> implements Iterable<V> {

src/main/java/com/gtnewhorizon/structurelib/util/Vec3Impl.java

@@ -141,8 +141,7 @@ public class Vec3Impl implements Comparable<Vec3Impl> {
     public boolean equals(Object o) {
         if (this == o) {
             return true;
-        } else if (o instanceof Vec3Impl) {
-            Vec3Impl vec3i = (Vec3Impl) o;
+        } else if (o instanceof Vec3Impl vec3i) {
             return val0 == vec3i.val0 && val1 == vec3i.val1 && val2 == vec3i.val2;
         }
         return false;

src/main/javadoc/overview.html

@@ -174,10 +174,115 @@ StructureLib API documentation.
     master channel.
 </p>
 
+<h3>Metadata-only channels</h3>
+
+<p>
+    A channel does not need to represent a block or an element in a structure shape. Structure definitions can declare
+    metadata-only channels for values such as a widget selection or a variable structure height. These declarations are
+    independent of <code>addElement</code> and do not require a fake block or a shape character.
+</p>
+
+<pre>
+IStructureDefinition.&lt;Controller&gt;builder()
+        .addChannel("height", 3, 100)
+        .addChannel("length", 4, 50)
+        .addChannel(IChannelDefinition.unbounded("widget"))
+        .addElement('A', ...)
+        .build();
+</pre>
+
+<p>
+    Channel values are still stored as integers in the trigger item's <code>channels</code> NBT compound. The
+    generic channel GUI has no active structure definition, so it edits integers and does not impose one
+    structure's range on every other structure using the same channel name. Structure-aware code reads values through
+    <code>IStructureDefinition#getChannelData</code>, which uses the definition's default when the subchannel is absent
+    and then applies that definition's local normalization policy.
+</p>
+
+<p>
+    Existing elements wrapped with <code>StructureUtility.withChannel</code> are discovered automatically. An explicit
+    channel declaration supplies its local range and normalization policy for that structure. The same channel name may
+    therefore use different ranges in different structure definitions.
+</p>
+
 <h3>why is this called channel?</h3>
 
 Just give me a better name and I'd do the renaming.
 
+<h3>Channel Descriptions</h3>
+<p>
+    Each channel can have one description associated with it per mod.
+    Channel description should briefly describe how a specific channel is used for inside a specific mod.
+    They will be displayed to player in channel editor GUI that comes with StructureLib.
+    The registration process can be done either via direct method call to {@link com.gtnewhorizon.structurelib.StructureLibAPI#registerChannelDescription(String, String, String)},
+    or by sending an IMC message.
+    After registration, the channel will also show up as autocomplete options when players are editing channels.
+</p>
+
+<p>
+    Here is an example of sending an IMC message to register two channels and their description.
+    In this example, we assume your modid is <code>my_mod</code> and your mod will ship with localization entries for
+    localization key <code>channels.my_mod.channel_1</code> and <code>channels.my_mod.channel_2</code>
+</p>
+
+<pre>
+        NBTTagCompound command = new NBTTagCompound();
+        NBTTagList tags = new NBTTagList();
+        String[] channels = {"channel_1", "channel_2"};
+        for (String channel : channels) {
+            NBTTagCompound tag = new NBTTagCompound();
+            tag.setString("Channel", channel);
+            tag.setString("Description", "channels.my_mod." + channel);
+            tags.appendTag(tag);
+        }
+        command.setTag("Channels", tags);
+        FMLInterModComms.sendMessage("structurelib", "register_channel", command);
+</pre>
+
+<p>
+    There is no strict rules over whether you should do direct API method call or send IMC messages.
+    You can choose whichever you prefer.
+</p>
+
+<h3>Channel Indicator Items</h3>
+<p>
+    You can associate an ItemStack with a given (channel, value) pair.
+    It is usually (but not required to be) the ItemBlock for the blocks to be placed by this (channel, value) pair.
+    Player will be able to drag and drop this item to the builtin channel configuration GUI.
+    The registration process can be done either via direct method call to {@link com.gtnewhorizon.structurelib.StructureLibAPI#registerChannelItem(String, String, int, net.minecraft.item.ItemStack)},
+    or by sending an IMC message.
+    After registration, the channel will also show up as autocomplete options when players are editing channels.
+</p>
+
+<p>
+    Here is an example of sending an IMC message to register 3 vanilla sandstone as different indicator for channel "sandstone", with block metadata plus 1 as channel value.
+    In this example, we assume your modid is <code>my_mod</code>.
+</p>
+
+<pre>
+        NBTTagCompound command = new NBTTagCompound();
+        NBTTagList items = new NBTTagList();
+        int[] metas = {0, 1, 2};
+        for (int meta : metas) {
+            NBTTagCompound tag = new NBTTagCompound();
+            tag.setTag("Item", new ItemStack(Blocks.sandstone, 1, meta).writeToNBT(new NBTTagCompound()));
+            NBTTagList channels = new NBTTagList();
+            NBTTagCompound channel = new NBTTagCompound();
+            channel.setString("Channel", "sandstone");
+            channel.setInteger("Value", meta + 1);
+            channels.appendTag(channel);
+            tag.setTag("Channels", channels);
+            items.appendTag(tag);
+        }
+        command.setTag("Items", items);
+        FMLInterModComms.sendMessage("structurelib", "register_channel_item", command);
+</pre>
+
+<p>
+    There is no strict rules over whether you should do direct API method call or send IMC messages.
+    You can choose whichever you prefer.
+</p>
+
 <h3>Examples</h3>
 
 <h4>For Structure Definition Author</h4>
@@ -251,5 +356,42 @@ The code for placeBlock() and spawnHint() will be left as an exercise for the re
 <p>
     Please refer to {@link com.gtnewhorizon.structurelib.StructureEvent} to see what events are available.
 </p>
+<h1>Extending Inventory Utility</h1>
+{@link com.gtnewhorizon.structurelib.util.InventoryUtility} is how structurelib survival autoplace pulls item for autoplacing.
+It has two key concepts: inventory providers and stack extractors.
+<p>
+    Inventory Providers are classes that retrieve an Iterable of ItemStacks for examination, given an EntityPlayerMP as identifier.
+    They are also responsible for marking the relevant item container as dirty, so changes can be commited to disk properly when world save happens.
+    Examples include: main player inventory, vanilla ender chest, baubles inventory. StructureLib comes with main player inventory and vanilla ender chest built in.
+</p>
+<p>
+    Stack Extractors are classes that retrieve items from another item.
+    Examples include: Forestry backpacks, ME network over ME Wireless Terminals.
+</p>
+<p>
+Both of these are managed internally by {@link com.gtnewhorizon.structurelib.SortedRegistry}.
+By default, elements registered will be sorted in lexicographical order in ascending order.
+However, facilities in StructureLib will allow an end user to tweak these registries as their wish.
+They can disable, reorder, reenable any element within the registry, either in game, at main menu or with the game stopped,
+Their changes will be synced to server as well, should they be playing on a dedicated server.
+</p>
+<p>
+    This has the following important implications
+</p>
+<ul>
+    <li>Not all inventory providers or stack extractors may be called during a survival autoplace session</li>
+    <li>One player could have stack extractor 001 ordered before 002, while the other having a completely reversed order</li>
+</ul>
+Therefore, if your stack extractor can somehow correlate with aonther one, make sure it still works if the calling order is inverted.
+At the very least, inform the player about this ordering constraint.
+A future StructrueLib refactor to specify this dependency info is possible, but the chance is low.
+<h2>Localization</h2>
+Both of these would show up in config GUI of StructureLib. Structurelib uses the following localization keys in that GUI.
+<ul>
+    <li><code>structurelib.sortedregistry.inventoryproviders.&lt;registry_key&gt;</code>: This is the name shown on the button for inventory providers. If this is not provided, then registry_key will be used instead.</li>
+    <li><code>structurelib.sortedregistry.inventoryproviders.&lt;registry_key&gt;.tooltip</code>: This is the tooltip shown when user hover over the button for inventory providers. If this is not provided, then no explicit tooltip will be shown.</li>
+    <li><code>structurelib.sortedregistry.stackextractors.&lt;registry_key&gt;</code>: This is the name shown on the button for stack extractors. If this is not provided, then registry_key will be used instead.</li>
+    <li><code>structurelib.sortedregistry.stackextractors.&lt;registry_key&gt;.tooltip</code>: This is the tooltip shown when user hover over the button for stack extractors. If this is not provided, then no explicit tooltip will be shown.</li>
+</ul>
 </BODY>
 </HTML>

src/main/resources/assets/structurelib/lang/en_US.lang

@@ -1,3 +1,4 @@
+tile.structurelib.blockhint.name=Hint
 tile.structurelib.blockhint.0.name=Hint 1 dot
 tile.structurelib.blockhint.1.name=Hint 2 dots
 tile.structurelib.blockhint.2.name=Hint 3 dots
@@ -29,12 +30,27 @@ item.structurelib.constructableTrigger.desc.4=Quantity of schematics in item sta
 item.structurelib.constructableTrigger.desc.5=Hold §l[LSHIFT]§r to display channel data
 item.structurelib.constructableTrigger.desc.lshift.0=Contain %d sub channel.
 item.structurelib.constructableTrigger.too_fast=Please wait %d milliseconds before another autoplace...
+item.structurelib.constructableTrigger.gui.title=Sub Channels
 item.structurelib.constructableTrigger.gui.key=Key:
 item.structurelib.constructableTrigger.gui.value=Value:
 item.structurelib.constructableTrigger.gui.add=Add
-item.structurelib.constructableTrigger.gui.set=Set
-item.structurelib.constructableTrigger.gui.unset=Unset
-item.structurelib.constructableTrigger.gui.wipe=§4Wipe
+item.structurelib.constructableTrigger.gui.set=Update
+item.structurelib.constructableTrigger.gui.unset=Remove
+item.structurelib.constructableTrigger.gui.wipe=§4Clear
+item.structurelib.constructableTrigger.gui.wipe.confirm=§4Sure?
+item.structurelib.constructableTrigger.gui.channels.from=§rMod: §9§o%s
+item.structurelib.constructableTrigger.gui.info=Many multiblocks support some degree of variation in their structure and a sub channel allows indication of which variant to use.\n All sub channels have a sequence of lowercase characters as key and a positive integer as value. Most known sub channels should be available as typeahead completions.\n You can also drag and drop items from NEI to set the corresponding sub channel value. These items all have a tooltip of "§oIndicates§r §ovalue§r §oX§r §ofor§r §osub§r §ochannel§r §oY§r".
+
+item.structurelib.debugConstructableTrigger.name=Debug Multiblock Structure Hologram Projector
+
+channels.structurelib.show_errors=When set, will highlight parts of the multiblock that is definitely wrong
+
+structurelib.tooltip.channelvalue=§7Value §b%d§r§7 for subchannel §b%s
+structurelib.tooltip.indicator_dnd=Drop into GUI or middle-click to select this value for this channel
+structurelib.pickchannel.success=§aSet §b%s§r§a to §b%d§r
+structurelib.pickchannel.cleared=§aAll channels cleared§r
+structurelib.pickchannel.confirmwipe=§6Sneak+Middle-click again to clear all channels
+structurelib.pickchannel.nomapping=§cNo channel mapping found for this item
 
 structurelib.autoplace.built_stat=Built %s blocks
 structurelib.autoplace.complete=§aThis multiblock has completed!
@@ -42,6 +58,7 @@ structurelib.autoplace.error.not_enabled=§cThis multiblock does not support aut
 structurelib.autoplace.error.no_simple_block=§cSuggested to place §r%s§c but none was found
 structurelib.autoplace.error.no_item_stack=§cSuggested to place block by using §r%s§c but none was found
 structurelib.autoplace.warning.no_explicit_channel=§6This structure depends on nonexistent sub channel §r%s§6. Using master channel instead.
+structurelib.autoplace.missing_block=§cMissing block: %s
 
 structurelib.blockhint.desc.0=Helps while building
 structurelib.blockhint.0.name=Hint 1 dot
@@ -172,3 +189,19 @@ structurelib.config.client.hologram.maxCoexisting=Max Coexisting Holograms
 structurelib.config.client.hologram.maxCoexisting.tooltip=Number of holograms that can coexist. Usually all hints generated by one right click belongs to one hologram. An attempt will be made to prune old holograms when a new hologram is about to be projected and this limit would be exceeded.
 structurelib.config.client.hologram.removeColliding=Remove Colliding Holograms
 structurelib.config.client.hologram.removeColliding.tooltip=Whether an attempt will be made to remove any existing hologram that collides with a new hologram.
+
+structurelib.config.registries=Sorted Registries
+structurelib.config.registries.tooltip=Sorted Registry is how StructureLib internally keep track of certain features. Each individual elements may be reordered, disabled and enabled at user's command. Changes will be synced to server if needed.\nThis gui can also be accessed in game by shift right clicking air with Multiblock Structure Hologram Projector.
+structurelib.config.registries.stackextractors=Stack Extractors
+structurelib.config.registries.stackextractors.tooltip=Controls which inventory-from-stack functions are enabled during survival autoplace
+structurelib.config.registries.inventoryproviders=Inventory Providers
+structurelib.config.registries.inventoryproviders.tooltip=Controls which inventories functions are enabled during survival autoplace
+
+structurelib.configgui.enabled=Enabled Entry
+structurelib.configgui.disabled=Disabled Entry
+structurelib.configgui.drag.tooltip=Drag this button to reorder this element.
+
+structurelib.sortedregistry.inventoryproviders.5000-main-inventory=Main Player Inventory
+structurelib.sortedregistry.inventoryproviders.5000-main-inventory.tooltip=36 slots of item in your main inventory. Armor slots excluded.
+structurelib.sortedregistry.inventoryproviders.7000-ender-inventory=Ender Chest Inventory
+structurelib.sortedregistry.inventoryproviders.7000-ender-inventory.tooltip=Links to your vanilla ender chest inventory. Require at least one "ender backpack like" item in main inventory to work.

src/main/resources/assets/structurelib/lang/ru_RU.lang

@@ -0,0 +1,200 @@
+tile.structurelib.blockhint.name=Подсказка
+tile.structurelib.blockhint.0.name=Подсказка 1 точка
+tile.structurelib.blockhint.1.name=Подсказка 2 точки
+tile.structurelib.blockhint.2.name=Подсказка 3 точки
+tile.structurelib.blockhint.3.name=Подсказка 4 точки
+tile.structurelib.blockhint.4.name=Подсказка 5 точек
+tile.structurelib.blockhint.5.name=Подсказка 6 точек
+tile.structurelib.blockhint.6.name=Подсказка 7 точек
+tile.structurelib.blockhint.7.name=Подсказка 8 точек
+tile.structurelib.blockhint.8.name=Подсказка 9 точек
+tile.structurelib.blockhint.9.name=Подсказка 10 точек
+tile.structurelib.blockhint.10.name=Подсказка 11 точек
+tile.structurelib.blockhint.11.name=Подсказка 12 точек
+tile.structurelib.blockhint.12.name=Общая подсказка
+tile.structurelib.blockhint.13.name=Подсказка воздух
+tile.structurelib.blockhint.14.name=Подсказка нет воздуха
+tile.structurelib.blockhint.15.name=Подсказка ошибка
+
+item.structurelib.frontRotationTool.name=Инструмент для поворота (Автономный)
+item.structurelib.frontRotationTool.desc.0=Открывает интерфейс поворота лицевой стороны
+item.structurelib.frontRotationTool.desc.1=Поворачивает только лицевую сторону,
+item.structurelib.frontRotationTool.desc.2=что позволяет повернуть всю структуру.
+
+item.structurelib.constructableTrigger.name=Голограммный проектор мультиблоковой структуры
+item.structurelib.constructableTrigger.desc.0=Используется по интерфейсу контроллера
+item.structurelib.constructableTrigger.desc.1=Показывает схему постройки мультиблочной структуры,
+item.structurelib.constructableTrigger.desc.2=используется при нажатии по контроллеру
+item.structurelib.constructableTrigger.desc.3=(Shift+ПКМ для автоматической постройки)
+item.structurelib.constructableTrigger.desc.4=Количество проекторов в одном слоте влияет на тир/режим/тип постройки, если он не задан в GUI проектора
+item.structurelib.constructableTrigger.desc.5=Удерживайте §l[LSHIFT]§r для отображения данных канала
+item.structurelib.constructableTrigger.desc.lshift.0=Содержит %d подканал
+item.structurelib.constructableTrigger.too_fast=Подождите %d миллисекунд перед очередным автозаполнением...
+item.structurelib.constructableTrigger.gui.title=Подканалы
+item.structurelib.constructableTrigger.gui.key=Ключ:
+item.structurelib.constructableTrigger.gui.value=Значение:
+item.structurelib.constructableTrigger.gui.add=Добавить
+item.structurelib.constructableTrigger.gui.set=Обновить
+item.structurelib.constructableTrigger.gui.unset=Удалить
+item.structurelib.constructableTrigger.gui.wipe=§4Очистить
+item.structurelib.constructableTrigger.gui.wipe.confirm=§4Уверен?
+item.structurelib.constructableTrigger.gui.channels.from=§rМод: §9§o%s
+item.structurelib.constructableTrigger.gui.info=Многие мультиблоки поддерживают различные вариации структуры. Субканал позволяет указать, какой именно вариант использовать.\nВсе субканалы в качестве ключа используют строку из строчных букв, а в качестве значения - положительное целое число. Для большинства известных субканалов доступно автодополнение при вводе.\nВы также можете перетаскивать предметы из NEI, чтобы задать значение соответствующего субканала. Все эти предметы имеют подсказку: "§oЗадаёт§r §oзначение§r §oX§r §oдля§r §oсубканала§r §oY§r"
+
+channels.structurelib.show_errors=Если включено, подсвечивает элементы мультиблока с явными ошибками
+
+structurelib.tooltip.channelvalue=§7Указывает значение §b%d§r§7 для подканала §b%s
+structurelib.tooltip.indicator_dnd=Перейдите в GUI, чтобы выбрать это значение для этого канала.
+
+structurelib.autoplace.built_stat=Построено %s блоков
+structurelib.autoplace.complete=§aЭтот мультиблок собран!
+structurelib.autoplace.error.not_enabled=§cЭтот мультиблок не поддерживает автозаполнение в выживании!
+structurelib.autoplace.error.no_simple_block=§cПредлагалось разместить §r%s§c но ничего не нашлось
+structurelib.autoplace.error.no_item_stack=§cПредлагалось разместить блок используя §r%s§c но ничего не нашлось
+structurelib.autoplace.warning.no_explicit_channel=§6Эта структура зависит от несуществующего подканала §r%s§6. Вместо этого используйте главный канал.
+
+structurelib.blockhint.desc.0=Помогает при постройке
+structurelib.blockhint.0.name=Подсказка 1 точка
+structurelib.blockhint.1.name=Подсказка 2 точки
+structurelib.blockhint.2.name=Подсказка 3 точки
+structurelib.blockhint.3.name=Подсказка 4 точки
+structurelib.blockhint.4.name=Подсказка 5 точек
+structurelib.blockhint.5.name=Подсказка 6 точек
+structurelib.blockhint.6.name=Подсказка 7 точек
+structurelib.blockhint.7.name=Подсказка 8 точек
+structurelib.blockhint.8.name=Подсказка 9 точек
+structurelib.blockhint.9.name=Подсказка 10 точек
+structurelib.blockhint.10.name=Подсказка 11 точек
+structurelib.blockhint.11.name=Подсказка 12 точек
+structurelib.blockhint.desc.1=Заполнитель конкретной группы.
+structurelib.blockhint.12.name=Общая подсказка
+structurelib.blockhint.desc.2=Общий заполнитель.
+structurelib.blockhint.13.name=Подсказка воздух
+structurelib.blockhint.desc.3=Убедитесь, что это содержит воздух.
+structurelib.blockhint.14.name=Подсказка нет воздуха
+structurelib.blockhint.desc.4=Убедитесь, что это не содержит воздух.
+structurelib.blockhint.15.name=Подсказка ошибка
+structurelib.blockhint.desc.5=ОШИБКА (а что вы ожидали?)
+itemGroup.structurelib=StructureLib
+
+structurelib.facing.0=вниз нормальный нет
+structurelib.facing.1=вниз нормальный по горизонтали
+structurelib.facing.2=вниз нормальный по вертикали
+structurelib.facing.3=вниз нормальный оба
+structurelib.facing.4=вниз по часовой стрелке нет
+structurelib.facing.5=вниз по часовой стрелке по горизонтали
+structurelib.facing.6=вниз по часовой стрелке по вертикали
+structurelib.facing.7=вниз по часовой стрелке оба
+structurelib.facing.8=вниз перевернутый
+structurelib.facing.9=вниз перевернутый
+structurelib.facing.10=вниз перевернутый
+structurelib.facing.11=вниз перевернутый
+structurelib.facing.12=вниз против часовой стрелки
+structurelib.facing.13=вниз против часовой стрелки
+structurelib.facing.14=вниз против часовой стрелки
+structurelib.facing.15=вниз против часовой стрелки
+structurelib.facing.16=вверх нормальный нет
+structurelib.facing.17=вверх нормальный по горизонтали
+structurelib.facing.18=вверх нормальный по вертикали
+structurelib.facing.19=вверх нормальный оба
+structurelib.facing.20=вверх по часовой стрелке нет
+structurelib.facing.21=вверх по часовой стрелке по горизонтали
+structurelib.facing.22=вверх по часовой стрелке по вертикали
+structurelib.facing.23=вверх по часовой стрелке оба
+structurelib.facing.24=вверх перевернутый
+structurelib.facing.25=вверх перевернутый
+structurelib.facing.26=вверх перевернутый
+structurelib.facing.27=вверх перевернутый
+structurelib.facing.28=вверх против часовой стрелки
+structurelib.facing.29=вверх против часовой стрелки
+structurelib.facing.30=вверх против часовой стрелки
+structurelib.facing.31=вверх против часовой стрелки
+structurelib.facing.32=север нормальный нет
+structurelib.facing.33=север нормальный по горизонтали
+structurelib.facing.34=север нормальный по вертикали
+structurelib.facing.35=север нормальный оба
+structurelib.facing.36=север по часовой стрелке нет
+structurelib.facing.37=север по часовой стрелке по горизонтали
+structurelib.facing.38=север по часовой стрелке по вертикали
+structurelib.facing.39=север по часовой стрелке оба
+structurelib.facing.40=север перевернутый
+structurelib.facing.41=север перевернутый
+structurelib.facing.42=север перевернутый
+structurelib.facing.43=север перевернутый
+structurelib.facing.44=север против часовой стрелки
+structurelib.facing.45=север против часовой стрелки
+structurelib.facing.46=север против часовой стрелки
+structurelib.facing.47=север против часовой стрелки
+structurelib.facing.48=юг нормальный нет
+structurelib.facing.49=юг нормальный по горизонтали
+structurelib.facing.50=юг нормальный по вертикали
+structurelib.facing.51=юг нормальный оба
+structurelib.facing.52=юг по часовой стрелке нет
+structurelib.facing.53=юг по часовой стрелке по горизонтали
+structurelib.facing.54=юг по часовой стрелке по вертикали
+structurelib.facing.55=юг по часовой стрелке оба
+structurelib.facing.56=юг перевернутый
+structurelib.facing.57=юг перевернутый
+structurelib.facing.58=юг перевернутый
+structurelib.facing.59=юг перевернутый
+structurelib.facing.60=юг против часовой стрелки
+structurelib.facing.61=юг против часовой стрелки
+structurelib.facing.62=юг против часовой стрелки
+structurelib.facing.63=юг против часовой стрелки
+structurelib.facing.64=запад нормальный нет
+structurelib.facing.65=запад нормальный по горизонтали
+structurelib.facing.66=запад нормальный по вертикали
+structurelib.facing.67=запад нормальный оба
+structurelib.facing.68=запад по часовой стрелке нет
+structurelib.facing.69=запад по часовой стрелке по горизонтали
+structurelib.facing.70=запад по часовой стрелке по вертикали
+structurelib.facing.71=запад по часовой стрелке оба
+structurelib.facing.72=запад перевернутый
+structurelib.facing.73=запад перевернутый
+structurelib.facing.74=запад перевернутый
+structurelib.facing.75=запад перевернутый
+structurelib.facing.76=запад против часовой стрелки
+structurelib.facing.77=запад против часовой стрелки
+structurelib.facing.78=запад против часовой стрелки
+structurelib.facing.79=запад против часовой стрелки
+structurelib.facing.80=восток нормальный нет
+structurelib.facing.81=восток нормальный по горизонтали
+structurelib.facing.82=восток нормальный по вертикали
+structurelib.facing.83=восток нормальный оба
+structurelib.facing.84=восток по часовой стрелке нет
+structurelib.facing.85=восток по часовой стрелке по горизонтали
+structurelib.facing.86=восток по часовой стрелке по вертикали
+structurelib.facing.87=восток по часовой стрелке оба
+structurelib.facing.88=восток перевернутый
+structurelib.facing.89=восток перевернутый
+structurelib.facing.90=восток перевернутый
+structurelib.facing.91=восток перевернутый
+structurelib.facing.92=восток против часовой стрелки
+structurelib.facing.93=восток против часовой стрелки
+structurelib.facing.94=восток против часовой стрелки
+structurelib.facing.95=восток против часовой стрелки
+
+structurelib.config.client=Настройки клиента
+structurelib.config.client.tooltip=Настройки, которые изменяют только внешний вид игры, но не то, как она функционирует.
+structurelib.config.client.hologram=Голограммные настройки
+structurelib.config.client.hologram.tooltip=Настройки, которые по умолчанию меняют способ проецирования голограммы в мир.
+structurelib.config.client.hologram.maxCoexisting=Макс. сосуществующих голограмм
+structurelib.config.client.hologram.maxCoexisting.tooltip=Количество голограмм, которые могут сосуществовать. Обычно все подсказки, сгенерированные одним щелчком ПКМ, принадлежат одной голограмме. Будет предпринята попытка удаления старой голограммы, когда будет проецироваться новая голограмма и этот лимит будет превышен.
+structurelib.config.client.hologram.removeColliding=Удалить сталкивающиеся голограммы
+structurelib.config.client.hologram.removeColliding.tooltip=Whether an attempt will be made to remove any existing hologram that collides with a new hologram.
+
+structurelib.config.registries=Sorted Registries
+structurelib.config.registries.tooltip=Sorted Registry is how StructureLib internally keep track of certain features. Each individual elements may be reordered, disabled and enabled at user's command. Changes will be synced to server if needed.\nThis gui can also be accessed in game by shift right clicking air with Multiblock Structure Hologram Projector.
+structurelib.config.registries.stackextractors=Stack Extractors
+structurelib.config.registries.stackextractors.tooltip=Controls which inventory-from-stack functions are enabled during survival autoplace
+structurelib.config.registries.inventoryproviders=Источники инвентарей
+structurelib.config.registries.inventoryproviders.tooltip=Controls which inventories functions are enabled during survival autoplace
+
+structurelib.configgui.enabled=Включённый элемент
+structurelib.configgui.disabled=Отключённый элемент
+structurelib.configgui.drag.tooltip=Перетащите эту кнопку, чтобы изменить порядок этого элемента.
+
+structurelib.sortedregistry.inventoryproviders.5000-main-inventory=Основной инвентарь игрока
+structurelib.sortedregistry.inventoryproviders.5000-main-inventory.tooltip=36 ячеек для предметов в вашем основном инвентаре. Слоты для брони исключены.
+structurelib.sortedregistry.inventoryproviders.7000-ender-inventory=Инвентарь сундука Эндера
+structurelib.sortedregistry.inventoryproviders.7000-ender-inventory.tooltip=Соединяет на ваш инвентарь из ванильного сундука Эндера. Требуется не менее один "похожий на рюкзак Эндера" предмет в основном инвентаре для работы.

src/main/resources/assets/structurelib/lang/zh_CN.lang

@@ -1,3 +1,4 @@
+tile.structurelib.blockhint.name=提示方块
 tile.structurelib.blockhint.0.name=提示方块：1号
 tile.structurelib.blockhint.1.name=提示方块：2号
 tile.structurelib.blockhint.2.name=提示方块：3号
@@ -29,12 +30,20 @@ item.structurelib.constructableTrigger.desc.4=此物品堆叠数量会影响显
 item.structurelib.constructableTrigger.desc.5=按下 §l[左SHIFT]§r 以显示子信道
 item.structurelib.constructableTrigger.desc.lshift.0=包含 %d 个子信道
 item.structurelib.constructableTrigger.too_fast=请在下一次自动搭建前等待 %d 毫秒...
+item.structurelib.constructableTrigger.gui.title=子信道
 item.structurelib.constructableTrigger.gui.key=信道名:
 item.structurelib.constructableTrigger.gui.value=值:
 item.structurelib.constructableTrigger.gui.add=添加
 item.structurelib.constructableTrigger.gui.set=替换
 item.structurelib.constructableTrigger.gui.unset=删除
 item.structurelib.constructableTrigger.gui.wipe=§4全部清空
+item.structurelib.constructableTrigger.gui.channels.from=§r模组: §9§o%s
+item.structurelib.constructableTrigger.gui.info=许多多方块的结构都是可变的，在自动放置时，可以使用子信道来向多方块指明该使用哪一个变体。\n子信道由一个字符串标识、并拥有一个正整数作为值。这个GUI中的信道名支持自动补全到绝大多数已知的子信道。\n你也可以将部分物品从NEI中拖拽至GUI内来设置子信道值为该物品表示的值。这些物品的物品说明中都带有§o表示子信道 X 为 Y§r。
+
+channels.structurelib.show_errors=添加后，在投影时会高亮标出必然错误的部分
+
+structurelib.tooltip.channelvalue=§7表示子信道 §b%2$s§r§7 为 §b%d§r
+structurelib.tooltip.indicator_dnd=拖入GUI中来选择该值
 
 structurelib.autoplace.built_stat=已放置 %s 个方块
 structurelib.autoplace.complete=§a这个多方块结构已经完成自动搭建！
@@ -172,3 +181,19 @@ structurelib.config.client.hologram.maxCoexisting=最多可以同时存在的全
 structurelib.config.client.hologram.maxCoexisting.tooltip=这决定最多可以同时存在多少台机器的全息投影。一般一次使用全息投影仪右键生成的所有机器结构细节被视为一个全息投影。当同时存在多个全息投影，并超过此数量时，再次使用全息投影仪会移除旧有的全息投影。
 structurelib.config.client.hologram.removeColliding=移除冲突的全息投影
 structurelib.config.client.hologram.removeColliding.tooltip=当新的全息投影与已存在的全息投影冲突时，开启此选项时会移除已存在的全息投影。
+
+structurelib.config.registries=注册表
+structurelib.config.registries.tooltip=StructureLib 使用注册表来管理其部分功能。每个注册表中的每一个元素都可以被单独排序、禁用。需要时，注册表的内容将被同步至服务端。
+structurelib.config.registries.stackextractors=物品提取器
+structurelib.config.registries.stackextractors.tooltip=该注册表控制在生存模式自动放置时，如何从物品（如林业背包）提取库存。
+structurelib.config.registries.inventoryproviders=物品栏定位
+structurelib.config.registries.inventoryproviders.tooltip=该注册表控制在生存模式自动放置时，可用的物品栏来源。
+
+structurelib.configgui.enabled=已启用
+structurelib.configgui.disabled=已禁用
+structurelib.configgui.drag.tooltip=拖动该按钮以重排。
+
+structurelib.sortedregistry.inventoryproviders.5000-main-inventory=玩家物品栏
+structurelib.sortedregistry.inventoryproviders.5000-main-inventory.tooltip=不包括护甲栏以外的36格。
+structurelib.sortedregistry.inventoryproviders.7000-ender-inventory=末影箱
+structurelib.sortedregistry.inventoryproviders.7000-ender-inventory.tooltip=当前玩家的末影箱。需要在主物品栏中存在类似于末影背包的东西才会实际生效。

src/main/resources/mixins.structurelib.early.json

@@ -0,0 +1,8 @@
+{
+  "required": true,
+  "minVersion": "0.8.5-GTNH",
+  "package": "com.gtnewhorizon.structurelib.mixins.early",
+  "refmap": "mixins.structurelib.refmap.json",
+  "target": "@env(DEFAULT)",
+  "compatibilityLevel": "JAVA_8"
+}

src/main/resources/mixins.structurelib.json

@@ -0,0 +1,8 @@
+{
+  "required": true,
+  "minVersion": "0.8.5-GTNH",
+  "package": "com.gtnewhorizon.structurelib.mixins",
+  "refmap": "mixins.structurelib.refmap.json",
+  "target": "@env(DEFAULT)",
+  "compatibilityLevel": "JAVA_8"
+}

src/main/resources/mixins.structurelib.late.json

@@ -0,0 +1,8 @@
+{
+  "required": true,
+  "minVersion": "0.8.5-GTNH",
+  "package": "com.gtnewhorizon.structurelib.mixins.late",
+  "refmap": "mixins.structurelib.refmap.json",
+  "target": "@env(DEFAULT)",
+  "compatibilityLevel": "JAVA_8"
+}