spotless

I don't think anyone would turn this off...

.github/workflows/build-and-test.yml

@@ -1,5 +1,3 @@
-# This workflow will build a Java project with Gradle and cache/restore any dependencies to improve the workflow execution time
-# For more information see: https://help.github.com/actions/language-and-framework-guides/building-and-testing-java-with-gradle
 
 name: Build and test
 
@@ -11,35 +9,5 @@ on:
 
 jobs:
   build-and-test:
-    runs-on: ubuntu-latest
-    steps:
-    - uses: actions/checkout@v2
-      with:
-        fetch-depth: 0
-
-    - name: Set up JDK 8
-      uses: actions/setup-java@v2
-      with:
-        java-version: '8'
-        distribution: 'adopt'
-        cache: gradle
-
-    - name: Grant execute permission for gradlew
-      run: chmod +x gradlew
-
-    - name: Setup the workspace
-      run: ./gradlew setupCIWorkspace
-
-    - name: Build the mod
-      run: ./gradlew build
-
-    - name: Run server for 1.5 minutes
-      run: |
-        mkdir run
-        echo "eula=true" > run/eula.txt
-        timeout 90 ./gradlew runServer 2>&1 | tee -a server.log || true
-
-    - name: Test no errors reported during server run
-      run: |
-        chmod +x .github/scripts/test_no_error_reports
-        .github/scripts/test_no_error_reports
+    uses: GTNewHorizons/GTNH-Actions-Workflows/.github/workflows/build-and-test.yml@master
+    secrets: inherit

.github/workflows/release-tags.yml

@@ -1,51 +1,14 @@
-# This workflow will build a Java project with Gradle and cache/restore any dependencies to improve the workflow execution time
-# For more information see: https://help.github.com/actions/language-and-framework-guides/building-and-testing-java-with-gradle
 
 name: Release tagged build
 
 on:
   push:
-    tags:
-      - '*'
+    tags: [ '*' ]
+
+permissions:
+  contents: write
 
 jobs:
-  build:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v2
-        with:
-          fetch-depth: 0
-
-      - name: Set release version
-        run: echo "RELEASE_VERSION=${GITHUB_REF#refs/*/}" >> $GITHUB_ENV
-
-      - name: Set up JDK 8
-        uses: actions/setup-java@v2
-        with:
-          java-version: '8'
-          distribution: 'adopt'
-          cache: gradle
-
-      - name: Grant execute permission for gradlew
-        run: chmod +x gradlew
-
-      - name: Setup the workspace
-        run: ./gradlew setupCIWorkspace
-
-      - name: Build the mod
-        run: ./gradlew build
-
-      - name: Release under current tag
-        uses: "marvinpinto/action-automatic-releases@latest"
-        with:
-          repo_token: "${{ secrets.GITHUB_TOKEN }}"
-          automatic_release_tag: "${{ env.RELEASE_VERSION }}"
-          prerelease: false
-          title: "${{ env.RELEASE_VERSION }}"
-          files: build/libs/*.jar
-
-      - name: Publish to Maven
-        run: ./gradlew publish
-        env:
-          MAVEN_USER: ${{ secrets.MAVEN_USER }}
-          MAVEN_PASSWORD: ${{ secrets.MAVEN_PASSWORD }}
+  release-tags:
+    uses: GTNewHorizons/GTNH-Actions-Workflows/.github/workflows/release-tags.yml@master
+    secrets: inherit

README.md

@@ -21,9 +21,14 @@ Originally created by TecTech authors, taken with permission. It's under MIT lic
     }
     ```
    Replace `master-SNAPSHOT` with a commit hash or a tag name (if any) of your choice to prevent unexpected upstream changes.
-2. Add `required-after:structurelib;` to your `@Mod(dependencies = "..")` tring. 
+2. Add `required-after:structurelib;` to your `@Mod(dependencies = "..")` tring.
 3. Add `structurelib` to your `mcmod.info`.
 
 ## Contribution
 
 The project is developed using IDEA. Please manually configure the build to not delegate to gradle for textures to show up in dev.
+
+## Current license
+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.

build.gradle

@@ -1,10 +1,9 @@
-//version: 1644894948
+//version: 1659977784
 /*
-DO NOT CHANGE THIS FILE!
-
-Also, you may replace this file at any time if there is an update available.
-Please check https://github.com/GTNewHorizons/ExampleMod1.7.10/blob/main/build.gradle for updates.
-*/
+ DO NOT CHANGE THIS FILE!
+ Also, you may replace this file at any time if there is an update available.
+ Please check https://github.com/GTNewHorizons/ExampleMod1.7.10/blob/main/build.gradle for updates.
+ */
 
 
 import com.github.jengelman.gradle.plugins.shadow.tasks.ConfigureShadowRelocation
@@ -12,10 +11,17 @@ import com.github.jengelman.gradle.plugins.shadow.tasks.ShadowJar
 import org.gradle.internal.logging.text.StyledTextOutput.Style
 import org.gradle.internal.logging.text.StyledTextOutputFactory
 
+import java.nio.file.Files
+import java.nio.file.Paths
 import java.util.concurrent.TimeUnit
+import java.util.zip.ZipEntry
+import java.util.zip.ZipInputStream
+import java.util.zip.ZipOutputStream
 
 buildscript {
     repositories {
+        mavenCentral()
+
         maven {
             name 'forge'
             url 'https://maven.minecraftforge.net'
@@ -37,21 +43,29 @@ buildscript {
         classpath 'com.github.GTNewHorizons:ForgeGradle:1.2.7'
     }
 }
-
 plugins {
     id 'java-library'
     id 'idea'
     id 'eclipse'
     id 'scala'
     id 'maven-publish'
-    id 'org.jetbrains.kotlin.jvm'        version '1.5.30' apply false
-    id 'org.jetbrains.kotlin.kapt'       version '1.5.30' apply false
+    id 'org.jetbrains.kotlin.jvm'        version '1.5.30'       apply false
+    id 'org.jetbrains.kotlin.kapt'       version '1.5.30'       apply false
+    id 'com.google.devtools.ksp'         version '1.5.30-1.0.0' apply false
     id 'org.ajoberstar.grgit'            version '4.1.1'
     id 'com.github.johnrengelman.shadow' version '4.0.4'
-    id 'com.palantir.git-version'        version '0.13.0' apply false
+    id 'com.palantir.git-version'        version '0.13.0'       apply false
     id 'de.undercouch.download'          version '5.0.1'
-    id 'com.github.gmazzo.buildconfig'   version '3.0.3'  apply false
+    id 'com.github.gmazzo.buildconfig'   version '3.0.3'        apply false
+    id 'com.diffplug.spotless'           version '6.7.2'        apply false
 }
+verifySettingsGradle()
+
+dependencies {
+    implementation 'com.diffplug:blowdryer:1.6.0'
+}
+
+apply plugin: 'com.diffplug.blowdryer'
 
 if (project.file('.git/HEAD').isFile()) {
     apply plugin: 'com.palantir.git-version'
@@ -77,6 +91,13 @@ idea {
     }
 }
 
+boolean disableSpotless = project.hasProperty("disableSpotless") ? project.disableSpotless.toBoolean() : false
+
+if (!disableSpotless) {
+    apply plugin: 'com.diffplug.spotless'
+    apply from: Blowdryer.file('spotless.gradle')
+}
+
 if(JavaVersion.current() != JavaVersion.VERSION_1_8) {
     throw new GradleException("This project requires Java 8, but it's running on " + JavaVersion.current())
 }
@@ -102,8 +123,11 @@ checkPropertyExists("containsMixinsAndOrCoreModOnly")
 checkPropertyExists("usesShadowedDependencies")
 checkPropertyExists("developmentEnvironmentUserName")
 
-boolean noPublishedSources = project.findProperty("noPublishedSources") ? project.noPublishedSources.toBoolean() : false
-
+boolean noPublishedSources = project.hasProperty("noPublishedSources") ? project.noPublishedSources.toBoolean() : false
+boolean usesMixinDebug = project.hasProperty('usesMixinDebug') ?: project.usesMixins.toBoolean()
+boolean forceEnableMixins = project.hasProperty('forceEnableMixins') ? project.forceEnableMixins.toBoolean() : false
+String channel = project.hasProperty('channel') ? project.channel : 'stable'
+String mappingsVersion = project.hasProperty('mappingsVersion') ? project.mappingsVersion : '12'
 String javaSourceDir = "src/main/java/"
 String scalaSourceDir = "src/main/scala/"
 String kotlinSourceDir = "src/main/kotlin/"
@@ -186,10 +210,10 @@ try {
 }
 catch (Exception ignored) {
     out.style(Style.Failure).text(
-        'This mod must be version controlled by Git AND the repository must provide at least one tag,\n' +
-        'or the VERSION override must be set! ').style(Style.SuccessHeader).text('(Do NOT download from GitHub using the ZIP option, instead\n' +
-        'clone the repository, see ').style(Style.Info).text('https://gtnh.miraheze.org/wiki/Development').style(Style.SuccessHeader).println(' for details.)'
-    )
+            'This mod must be version controlled by Git AND the repository must provide at least one tag,\n' +
+            'or the VERSION override must be set! ').style(Style.SuccessHeader).text('(Do NOT download from GitHub using the ZIP option, instead\n' +
+            'clone the repository, see ').style(Style.Info).text('https://gtnh.miraheze.org/wiki/Development').style(Style.SuccessHeader).println(' for details.)'
+            )
     versionOverride = 'NO-GIT-TAG-SET'
     identifiedVersion = versionOverride
 }
@@ -213,11 +237,11 @@ else {
 def arguments = []
 def jvmArguments = []
 
-if (usesMixins.toBoolean()) {
+if (usesMixins.toBoolean() || forceEnableMixins) {
     arguments += [
         "--tweakClass org.spongepowered.asm.launch.MixinTweaker"
     ]
-    if (!project.hasProperty(usesMixinDebug) || usesMixinDebug.toBoolean()) {
+    if (usesMixinDebug.toBoolean()) {
         jvmArguments += [
             "-Dmixin.debug.countInjections=true",
             "-Dmixin.debug.verbose=true",
@@ -278,7 +302,7 @@ repositories {
         name 'Overmind forge repo mirror'
         url 'https://gregtech.overminddl1.com/'
     }
-    if(usesMixins.toBoolean()) {
+    if(usesMixins.toBoolean() || forceEnableMixins) {
         maven {
             name 'sponge'
             url 'https://repo.spongepowered.org/repository/maven-public'
@@ -295,6 +319,8 @@ dependencies {
         annotationProcessor('com.google.guava:guava:24.1.1-jre')
         annotationProcessor('com.google.code.gson:gson:2.8.6')
         annotationProcessor('org.spongepowered:mixin:0.8-SNAPSHOT')
+    }
+    if(usesMixins.toBoolean() || forceEnableMixins) {
         // using 0.8 to workaround a issue in 0.7 which fails mixin application
         compile('com.github.GTNewHorizons:SpongePoweredMixin:0.7.12-GTNH') {
             // Mixin includes a lot of dependencies that are too up-to-date
@@ -352,7 +378,10 @@ shadowJar {
     }
 
     minimize()  // This will only allow shading for actually used classes
-    configurations = [project.configurations.shadowImplementation, project.configurations.shadowCompile]
+    configurations = [
+        project.configurations.shadowImplementation,
+        project.configurations.shadowCompile
+    ]
     dependsOn(relocateShadowJar)
 }
 
@@ -383,12 +412,12 @@ afterEvaluate {
     if(usesMixins.toBoolean()) {
         tasks.compileJava {
             options.compilerArgs += [
-                    "-AreobfSrgFile=${tasks.reobf.srg}",
-                    "-AoutSrgFile=${mixinSrg}",
-                    "-AoutRefMapFile=${refMap}",
-                    // Elan: from what I understand they are just some linter configs so you get some warning on how to properly code
-                    "-XDenableSunApiLintControl",
-                    "-XDignore.symbol.file"
+                "-AreobfSrgFile=${tasks.reobf.srg}",
+                "-AoutSrgFile=${mixinSrg}",
+                "-AoutRefMapFile=${refMap}",
+                // Elan: from what I understand they are just some linter configs so you get some warning on how to properly code
+                "-XDenableSunApiLintControl",
+                "-XDignore.symbol.file"
             ]
         }
     }
@@ -397,8 +426,8 @@ afterEvaluate {
 runClient {
     if(developmentEnvironmentUserName) {
         arguments += [
-                "--username",
-                developmentEnvironmentUserName
+            "--username",
+            developmentEnvironmentUserName
         ]
     }
 
@@ -416,13 +445,14 @@ tasks.withType(JavaExec).configureEach {
             javaToolchains.launcherFor {
                 languageVersion = projectJavaVersion
             }
-    )
+            )
 }
 
 processResources {
     // this will ensure that this task is redone when the versions change.
     inputs.property "version", project.version
     inputs.property "mcversion", project.minecraft.version
+    exclude("spotless.gradle")
 
     // replace stuff in mcmod.info, nothing else
     from(sourceSets.main.resources.srcDirs) {
@@ -430,9 +460,9 @@ processResources {
 
         // replace modVersion and minecraftVersion
         expand "minecraftVersion": project.minecraft.version,
-            "modVersion": modVersion,
-            "modId": modId,
-            "modName": modName
+        "modVersion": modVersion,
+        "modId": modId,
+        "modName": modName
     }
 
     if(usesMixins.toBoolean()) {
@@ -442,6 +472,7 @@ processResources {
     // copy everything else that's not the mcmod.info
     from(sourceSets.main.resources.srcDirs) {
         exclude 'mcmod.info'
+        exclude 'spotless.gradle'
     }
 }
 
@@ -461,9 +492,9 @@ def getManifestAttributes() {
 
     if(usesMixins.toBoolean()) {
         manifestAttributes += [
-                "TweakClass" : "org.spongepowered.asm.launch.MixinTweaker",
-                "MixinConfigs" : "mixins." + modId + ".json",
-                "ForceLoadAsMod" : !containsMixinsAndOrCoreModOnly.toBoolean()
+            "TweakClass" : "org.spongepowered.asm.launch.MixinTweaker",
+            "MixinConfigs" : "mixins." + modId + ".json",
+            "ForceLoadAsMod" : !containsMixinsAndOrCoreModOnly.toBoolean()
         ]
     }
     return manifestAttributes
@@ -490,7 +521,10 @@ task shadowDevJar(type: ShadowJar) {
     }
 
     minimize()  // This will only allow shading for actually used classes
-    configurations = [project.configurations.shadowImplementation, project.configurations.shadowCompile]
+    configurations = [
+        project.configurations.shadowImplementation,
+        project.configurations.shadowCompile
+    ]
 }
 
 task relocateShadowDevJar(type: ConfigureShadowRelocation) {
@@ -567,7 +601,7 @@ publishing {
                 artifact source: shadowJar, classifier: ""
             }
             if(!noPublishedSources) {
-                artifact source: sourcesJar, classifier: "src"
+                artifact source: sourcesJar, classifier: "sources"
             }
             artifact source: usesShadowedDependencies.toBoolean() ? shadowDevJar : devJar, classifier: "dev"
             if (apiPackage) {
@@ -582,7 +616,10 @@ publishing {
             // remove extra garbage from minecraft and minecraftDeps configuration
             pom.withXml {
                 def badArtifacts = [:].withDefault {[] as Set<String>}
-                for (configuration in [projectConfigs.minecraft, projectConfigs.minecraftDeps]) {
+                for (configuration in [
+                            projectConfigs.minecraft,
+                            projectConfigs.minecraftDeps
+                        ]) {
                     for (dependency in configuration.allDependencies) {
                         badArtifacts[dependency.group == null ? "" : dependency.group] += dependency.name
                     }
@@ -616,11 +653,11 @@ task updateBuildScript {
     doLast {
         if (performBuildScriptUpdate(projectDir.toString())) return
 
-        print("Build script already up-to-date!")
+            print("Build script already up-to-date!")
     }
 }
 
-if (isNewBuildScriptVersionAvailable(projectDir.toString())) {
+if (!project.getGradle().startParameter.isOffline() && isNewBuildScriptVersionAvailable(projectDir.toString())) {
     if (autoUpdateBuildScript.toBoolean()) {
         performBuildScriptUpdate(projectDir.toString())
     } else {
@@ -631,12 +668,26 @@ if (isNewBuildScriptVersionAvailable(projectDir.toString())) {
 static URL availableBuildScriptUrl() {
     new URL("https://raw.githubusercontent.com/GTNewHorizons/ExampleMod1.7.10/main/build.gradle")
 }
+static URL exampleSettingsGradleUrl() {
+    new URL("https://raw.githubusercontent.com/GTNewHorizons/ExampleMod1.7.10/main/settings.gradle.example")
+}
+
+
+def verifySettingsGradle() {
+    def settingsFile = getFile("settings.gradle")
+    if (!settingsFile.exists()) {
+        println("Downloading default settings.gradle")
+        exampleSettingsGradleUrl().withInputStream { i -> settingsFile.withOutputStream { it << i } }
+        throw new GradleException("Settings.gradle has been updated, please re-run task.")
+    }
+}
 
 boolean performBuildScriptUpdate(String projectDir) {
     if (isNewBuildScriptVersionAvailable(projectDir)) {
         def buildscriptFile = getFile("build.gradle")
         availableBuildScriptUrl().withInputStream { i -> buildscriptFile.withOutputStream { it << i } }
         out.style(Style.Success).print("Build script updated. Please REIMPORT the project or RESTART your IDE!")
+        verifySettingsGradle()
         return true
     }
     return false
@@ -667,80 +718,225 @@ configure(updateBuildScript) {
     description = 'Updates the build script to the latest version'
 }
 
-// Deobfuscation
+// Parameter Deobfuscation
+
+task deobfParams {
+    doLast {
+
+        String mcpDir = "$project.gradle.gradleUserHomeDir/caches/minecraft/de/oceanlabs/mcp/mcp_$channel/$mappingsVersion"
+        String mcpZIP = "$mcpDir/mcp_$channel-$mappingsVersion-${minecraftVersion}.zip"
+        String paramsCSV = "$mcpDir/params.csv"
+
+        download.run {
+            src "https://maven.minecraftforge.net/de/oceanlabs/mcp/mcp_$channel/$mappingsVersion-$minecraftVersion/mcp_$channel-$mappingsVersion-${minecraftVersion}.zip"
+            dest mcpZIP
+            overwrite false
+        }
+
+        if(!file(paramsCSV).exists()) {
+            println("Extracting MCP archive ...")
+            unzip(mcpZIP, mcpDir)
+        }
+
+        println("Parsing params.csv ...")
+        Map<String, String> params = new HashMap<>()
+        Files.lines(Paths.get(paramsCSV)).forEach{line ->
+            String[] cells = line.split(",")
+            if(cells.length > 2 && cells[0].matches("p_i?\\d+_\\d+_")) {
+                params.put(cells[0], cells[1])
+            }
+        }
+
+        out.style(Style.Success).println("Modified ${replaceParams(file("$projectDir/src/main/java"), params)} files!")
+    out.style(Style.Failure).println("Don't forget to verify that the code still works as before!\n It could be broken due to duplicate variables existing now\n or parameters taking priority over other variables.")
+}
+}
+
+static int replaceParams(File file, Map<String, String> params) {
+int fileCount = 0
+
+if(file.isDirectory()) {
+    for(File f : file.listFiles()) {
+        fileCount += replaceParams(f, params)
+    }
+    return fileCount
+}
+println("Visiting ${file.getName()} ...")
+try {
+    String content = new String(Files.readAllBytes(file.toPath()))
+    int hash = content.hashCode()
+    params.forEach{key, value ->
+        content = content.replaceAll(key, value)
+    }
+    if(hash != content.hashCode()) {
+        Files.write(file.toPath(), content.getBytes("UTF-8"))
+        return 1
+    }
+} catch(Exception e) {
+    e.printStackTrace()
+}
+return 0
+}
+
+// Credit: bitsnaps (https://gist.github.com/bitsnaps/00947f2dce66f4bbdabc67d7e7b33681)
+static unzip(String zipFileName, String outputDir) {
+byte[] buffer = new byte[16384]
+ZipInputStream zis = new ZipInputStream(new FileInputStream(zipFileName))
+ZipEntry zipEntry = zis.getNextEntry()
+while (zipEntry != null) {
+    File newFile = new File(outputDir + File.separator, zipEntry.name)
+    if (zipEntry.isDirectory()) {
+        if (!newFile.isDirectory() && !newFile.mkdirs()) {
+            throw new IOException("Failed to create directory $newFile")
+        }
+    } else {
+        // fix for Windows-created archives
+        File parent = newFile.parentFile
+        if (!parent.isDirectory() && !parent.mkdirs()) {
+            throw new IOException("Failed to create directory $parent")
+        }
+        // write file content
+        FileOutputStream fos = new FileOutputStream(newFile)
+        int len = 0
+        while ((len = zis.read(buffer)) > 0) {
+            fos.write(buffer, 0, len)
+        }
+        fos.close()
+    }
+    zipEntry = zis.getNextEntry()
+}
+zis.closeEntry()
+zis.close()
+}
+
+configure(deobfParams) {
+group = 'forgegradle'
+description = 'Rename all obfuscated parameter names inherited from Minecraft classes'
+}
+
+// Dependency Deobfuscation
 
 def deobf(String sourceURL) {
-    try {
-        URL url = new URL(sourceURL)
-        String fileName = url.getFile()
+try {
+    URL url = new URL(sourceURL)
+    String fileName = url.getFile()
 
-        //get rid of directories:
-        int lastSlash = fileName.lastIndexOf("/")
-        if(lastSlash > 0) {
-            fileName = fileName.substring(lastSlash + 1)
-        }
-        //get rid of extension:
-        if(fileName.endsWith(".jar")) {
-            fileName = fileName.substring(0, fileName.lastIndexOf("."))
-        }
-
-        String hostName = url.getHost()
-        if(hostName.startsWith("www.")) {
-            hostName = hostName.substring(4)
-        }
-        List parts = Arrays.asList(hostName.split("\\."))
-        Collections.reverse(parts)
-        hostName = String.join(".", parts)
-
-        return deobf(sourceURL, hostName + "/" + fileName)
-    } catch(Exception e) {
-        return deobf(sourceURL, "deobf/" + String.valueOf(sourceURL.hashCode()))
+    //get rid of directories:
+    int lastSlash = fileName.lastIndexOf("/")
+    if(lastSlash > 0) {
+        fileName = fileName.substring(lastSlash + 1)
     }
+    //get rid of extension:
+    if(fileName.endsWith(".jar") || fileName.endsWith(".litemod")) {
+        fileName = fileName.substring(0, fileName.lastIndexOf("."))
+    }
+
+    String hostName = url.getHost()
+    if(hostName.startsWith("www.")) {
+        hostName = hostName.substring(4)
+    }
+    List parts = Arrays.asList(hostName.split("\\."))
+    Collections.reverse(parts)
+    hostName = String.join(".", parts)
+
+    return deobf(sourceURL, "$hostName/$fileName")
+} catch(Exception e) {
+    return deobf(sourceURL, "deobf/${sourceURL.hashCode()}")
+}
 }
 
 // The method above is to be preferred. Use this method if the filename is not at the end of the URL.
-def deobf(String sourceURL, String fileName) {
-    String cacheDir = System.getProperty("user.home") + "/.gradle/caches/"
-    String bon2Dir = cacheDir + "forge_gradle/deobf"
-    String bon2File  = bon2Dir + "/BON2-2.5.0.jar"
-    String obfFile = cacheDir + "modules-2/files-2.1/" + fileName + ".jar"
-    String deobfFile = cacheDir + "modules-2/files-2.1/" + fileName + "-deobf.jar"
-
-    if(file(deobfFile).exists()) {
-        return files(deobfFile)
-    }
-
-    download.run {
-        src 'https://github.com/GTNewHorizons/BON2/releases/download/2.5.0/BON2-2.5.0.CUSTOM-all.jar'
-        dest bon2File
-        quiet true
-        overwrite false
-    }
-
-    download.run {
-        src sourceURL
-        dest obfFile
-        quiet true
-        overwrite false
-    }
-
-    exec {
-        commandLine 'java', '-jar', bon2File, '--inputJar', obfFile, '--outputJar', deobfFile, '--mcVer', '1.7.10', '--mappingsVer', 'stable_12', '--notch'
-        workingDir bon2Dir
-        standardOutput = new ByteArrayOutputStream()
-    }
+def deobf(String sourceURL, String rawFileName) {
+String bon2Version = "2.5.1"
+String fileName = URLDecoder.decode(rawFileName, "UTF-8")
+String cacheDir = "$project.gradle.gradleUserHomeDir/caches"
+String bon2Dir = "$cacheDir/forge_gradle/deobf"
+String bon2File = "$bon2Dir/BON2-${bon2Version}.jar"
+String obfFile = "$cacheDir/modules-2/files-2.1/${fileName}.jar"
+String deobfFile = "$cacheDir/modules-2/files-2.1/${fileName}-deobf.jar"
 
+if(file(deobfFile).exists()) {
     return files(deobfFile)
 }
 
+String mappingsVer
+String remoteMappings = project.hasProperty('remoteMappings') ? project.remoteMappings : 'https://raw.githubusercontent.com/MinecraftForge/FML/1.7.10/conf/'
+if(remoteMappings) {
+    String id = "${forgeVersion.split("\\.")[3]}-$minecraftVersion"
+    String mappingsZIP = "$cacheDir/forge_gradle/maven_downloader/de/oceanlabs/mcp/mcp_snapshot_nodoc/$id/mcp_snapshot_nodoc-${id}.zip"
+
+    zipMappings(mappingsZIP, remoteMappings, bon2Dir)
+
+    mappingsVer = "snapshot_$id"
+} else {
+    mappingsVer = "${channel}_$mappingsVersion"
+}
+
+download.run {
+    src "http://jenkins.usrv.eu:8081/nexus/content/repositories/releases/com/github/parker8283/BON2/$bon2Version-CUSTOM/BON2-$bon2Version-CUSTOM-all.jar"
+    dest bon2File
+    quiet true
+    overwrite false
+}
+
+download.run {
+    src sourceURL
+    dest obfFile
+    quiet true
+    overwrite false
+}
+
+exec {
+    commandLine 'java', '-jar', bon2File, '--inputJar', obfFile, '--outputJar', deobfFile, '--mcVer', minecraftVersion, '--mappingsVer', mappingsVer, '--notch'
+    workingDir bon2Dir
+    standardOutput = new FileOutputStream("${deobfFile}.log")
+}
+
+return files(deobfFile)
+}
+
+def zipMappings(String zipPath, String url, String bon2Dir) {
+File zipFile = new File(zipPath)
+if(zipFile.exists()) {
+    return
+}
+
+String fieldsCache = "$bon2Dir/data/fields.csv"
+String methodsCache = "$bon2Dir/data/methods.csv"
+
+download.run {
+    src "${url}fields.csv"
+    dest fieldsCache
+    quiet true
+}
+download.run {
+    src "${url}methods.csv"
+    dest methodsCache
+    quiet true
+}
+
+zipFile.getParentFile().mkdirs()
+ZipOutputStream zos = new ZipOutputStream(new FileOutputStream(zipFile))
+
+zos.putNextEntry(new ZipEntry("fields.csv"))
+Files.copy(Paths.get(fieldsCache), zos)
+zos.closeEntry()
+
+zos.putNextEntry(new ZipEntry("methods.csv"))
+Files.copy(Paths.get(methodsCache), zos)
+zos.closeEntry()
+
+zos.close()
+}
+
 // Helper methods
 
 def checkPropertyExists(String propertyName) {
-    if (!project.hasProperty(propertyName)) {
-        throw new GradleException("This project requires a property \"" + propertyName + "\"! Please add it your \"gradle.properties\". You can find all properties and their description here: https://github.com/GTNewHorizons/ExampleMod1.7.10/blob/main/gradle.properties")
-    }
+if (!project.hasProperty(propertyName)) {
+    throw new GradleException("This project requires a property \"" + propertyName + "\"! Please add it your \"gradle.properties\". You can find all properties and their description here: https://github.com/GTNewHorizons/ExampleMod1.7.10/blob/main/gradle.properties")
+}
 }
 
 def getFile(String relativePath) {
-    return new File(projectDir, relativePath)
+return new File(projectDir, relativePath)
 }

dependencies.gradle

@@ -1,5 +1,6 @@
 // Add your dependencies here
 
 dependencies {
-
+    compile("com.github.GTNewHorizons:GTNHLib:0.0.1:dev")
+    runtime("com.github.GTNewHorizons:NotEnoughItems:2.2.20-GTNH:dev")
 }

docs/channels.md

@@ -0,0 +1,72 @@
+# Constructable Tool
+
+The convention is to use the stack size of tool stack to pass tier info.
+
+## Channels
+
+When one multi have multiple tiered component that can have interleaving tier, this becomes an obnoxious restriction, as
+one ItemStack cannot have two stack sizes at the same time.
+Here we use the item NBT to bypass this restriction.
+
+Basically, one hologram can contain multiple channels.
+Each channel can be identified with lower case strings and has the value being one positive Java int.
+There will be one and only one master channel and 0 or more sub channel.
+
+When a non-existent sub channel is queried, master channel will be used instead to fill its place.
+
+Structure element designers will usually not need to consider channels, i.e. proceed as if this concept does not exist, unless it must take input from multiple channels.
+
+Multi Designers will consider how to map each channel to each tiered component.
+He will be using `com.gtnewhorizon.structurelib.structure.StructureUtility.withChannel` to direct structure element on which channel to use.
+Conceptually, it will return an ItemStack with the master channel being the value of selected channel.
+In implementation, withChannel will return a new ItemStack with same item, nbt but different stack size.
+
+In any case, it is NOT safe to mutate or query this ItemStack beyond its stack size.
+What information this carries (beyond the stack size) is an implementation detail and should not be relied on.
+__For the future of mankind please do not rely on this.__
+
+### why is this called channel?
+
+IDK man, just give me a better name and I'd do the renaming.
+
+### Example: Multiblock Structure Designer
+
+GT++ Chemical Plant is a multi with 4 distinctly tiered component.
+
+It will use
+* master channel for its outer shell
+* channel `"casing"` for machine casings
+* channel `"pipe"` for pipe casings
+* channel `"coil"` for heating coils
+
+Its structure code will then look like
+```java
+.addElement('a', shellStructureElement())
+.addElement('b', withChannel("casing", machineCasingStructureElement()))
+.addElement('c', withChannel("pipe", pipeCasingStructureElement()))
+.addElement('d', withChannel("coil", coilStructureElement()))
+```
+
+whereas all these structure elements are designed without considering channels whatsoever
+
+### Example: Multi channel input Structure Element
+
+Suppose your hatch element has a required facing and can accept arbitrary meta tile entity, so it will need both meta id and facing input.
+
+
+It will use
+* master channel for its outer shell
+* channel `"casing"` for machine casings
+* channel `"pipe"` for pipe casings
+* channel `"coil"` for heating coils
+
+Its structure code will then look like
+```java
+.addElement('a', shellStructureElement())
+.addElement('b', withChannel("casing", machineCasingStructureElement()))
+.addElement('c', withChannel("pipe", pipeCasingStructureElement()))
+.addElement('d', withChannel("coil", coilStructureElement()))
+```
+
+whereas all these structure elements are designed without considering channels whatsoever
+

docs/walkthrough.md

@@ -0,0 +1,62 @@
+# StructureLib Developer Guide v0.1-SNAPSHOT
+
+## `IStructureDefinition`
+
+`IStructureDefinition` is the structure definition of your multi. You will have one `IStructureDefinition` for each multi.
+
+### Caching?
+
+You will construct this definition once per multi, either at class load or at first call to `getStructureDefinition()`.
+You can use a `ClassValue<IStructureDefinition<?>>` if you have a template for subclass.
+You can also use `StructureUtility.defer()` for simpler cases, but it is slightly less performant as it will allocate new
+objects on each structure check, whereas `ClassValue` will allocate once and cache it onwards.
+
+### Constructing
+
+IStructureDefinition is constructed using `IStructureDefinition#builder()`.
+
+Builder has two main methods
+1. `addShape` is a 2d string array describing the layout of structure. You can optionally use `StructureUtility#transpose()`
+to transpose the array to make the structure look nicer in source code.
+2. `addElement`. It takes a char identifier (mapped to a char in any of `addShape()` calls) and a IStructureElement.
+
+## `IStructureElement`
+
+`IStructureElement` are how you define which block will be accepted.
+They are simple stateless classes. They will rely on the multiblock controller to store any states they need.
+If you don't want to store these transient states in multiblock controller, you can use `StructureUtility#withContext()`
+
+They will usually come from `StructureUtility`.
+There is a vast library of `IStructureElement` there to cover basic needs.
+For more complex usage, you can define your own subclass, e.g. GregTech 5 Unofficial defines `ofHatchAdder()`, `ofCoil()`,
+`ofFrame()` and `buildHatchAdder()` in its `GT_StructureUtility` class.
+
+Here we will detail a few more complex `IStructureElement` that comes with standard library.
+
+### `ofBlocksTiered`
+
+This assumes you have a series of block, e.g. T1 motor, T2 motor, etc. Your multi will accept any of them (__as long as
+player does not mix them (*)__), but would like to know which is used.
+
+(*): Implementation wise, this structure element will only accept a block if its tier is the same as existing tier or
+if existing tier is unset (i.e. value of third argument)
+
+The first argument is tier extractor.
+You will need to provide a function to convert block+meta to a tier.
+This tier cam be an Enum, an Integer, a String, or basically anything.
+It doesn't even have to implement `Comparable`.
+The choice is yours.
+The extractor can return null and will never be passed a null block or an invalid block meta.
+
+The second argument is a list of all blocks you know that you will accept.
+This list is only for hint particle spawning and survival build.
+The hint/autoplace code will choose 1st pair to spawn/place if hologram has [channel data](./channels.md) of 1,
+2nd pair if 2, and so on.
+
+The third argument is the value when the tier has not been set by structure code.
+This means getter (5th argument) will usually return this upon first invocation for each round of structure check.
+
+The fourth argument will notify the multi of a tier change.
+
+The fifth argument is how multi notify the structure element about current tier.
+This is necessary as all structure element are stateless themselves.

repositories.gradle

@@ -1,5 +1,8 @@
 // Add any additional repositiroes for your dependencies here
 
 repositories {
-
+    maven {
+        name = "GTNH"
+        url = "http://jenkins.usrv.eu:8081/nexus/content/groups/public/"
+    }
 }

settings.gradle

@@ -0,0 +1,10 @@
+plugins {
+    id 'com.diffplug.blowdryerSetup' version '1.6.0'
+}
+
+apply plugin: 'com.diffplug.blowdryerSetup'
+
+blowdryerSetup {
+    github('GTNewHorizons/ExampleMod1.7.10', 'tag', '0.1.4')
+    //devLocal '.' // Use this when testing config updates locally
+}

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

@@ -1,31 +1,31 @@
-package com.gtnewhorizon.structurelib.proxy;
+package com.gtnewhorizon.structurelib;
 
 import com.google.common.collect.BiMap;
 import com.google.common.collect.HashBiMap;
-import com.gtnewhorizon.structurelib.ConfigurationHandler;
 import com.gtnewhorizon.structurelib.entity.fx.EntityFXBlockHint;
-import com.gtnewhorizon.structurelib.entity.fx.WeightlessParticleFX;
+import com.gtnewhorizon.structurelib.net.SetChannelDataMessage;
 import cpw.mods.fml.common.event.FMLPreInitializationEvent;
 import cpw.mods.fml.common.eventhandler.SubscribeEvent;
+import java.util.ArrayList;
+import java.util.Iterator;
+import java.util.LinkedList;
+import java.util.List;
 import net.minecraft.block.Block;
 import net.minecraft.client.Minecraft;
 import net.minecraft.client.gui.GuiNewChat;
-import net.minecraft.client.particle.EntityFX;
 import net.minecraft.entity.player.EntityPlayer;
+import net.minecraft.entity.player.EntityPlayerMP;
+import net.minecraft.item.ItemStack;
 import net.minecraft.util.ChatComponentText;
 import net.minecraft.util.IIcon;
 import net.minecraft.world.World;
 import net.minecraftforge.common.MinecraftForge;
 import net.minecraftforge.event.world.WorldEvent;
 
-import java.util.ArrayList;
-import java.util.Iterator;
-import java.util.LinkedList;
-import java.util.List;
-
-import static com.gtnewhorizon.structurelib.StructureLib.RANDOM;
-
 public class ClientProxy extends CommonProxy {
+
+    private static final short[] NO_TINT = {255, 255, 255, 0};
+
     @Override
     public void hintParticleTinted(World w, int x, int y, int z, IIcon[] icons, short[] RGBa) {
         EntityFXBlockHint hint = new EntityFXBlockHint(w, x, y, z, icons).withColorTint(RGBa);
@@ -46,10 +46,6 @@ public class ClientProxy extends CommonProxy {
             allHints.forcePut(hint, info);
         }
         currentHints.add(hint);
-
-        EntityFX particle = new WeightlessParticleFX(w, x + RANDOM.nextFloat() * 0.5F, y + RANDOM.nextFloat() * 0.5F, z + RANDOM.nextFloat() * 0.5F, 0, 0, 0);
-        particle.setRBGColorF(0, 0.6F * RANDOM.nextFloat(), 0.8f);
-        Minecraft.getMinecraft().effectRenderer.addEffect(particle);
     }
 
     @Override
@@ -59,12 +55,25 @@ public class ClientProxy extends CommonProxy {
 
     @Override
     public void hintParticle(World w, int x, int y, int z, IIcon[] icons) {
-        hintParticleTinted(w, x, y, z, icons, new short[]{255, 255, 255, 0});
+        hintParticleTinted(w, x, y, z, icons, NO_TINT);
     }
 
     @Override
     public void hintParticle(World w, int x, int y, int z, Block block, int meta) {
-        hintParticleTinted(w, x, y, z, createIIconFromBlock(block, meta), new short[]{255, 255, 255, 0});
+        hintParticleTinted(w, x, y, z, createIIconFromBlock(block, meta), NO_TINT);
+    }
+
+    @Override
+    public boolean updateHintParticleTint(EntityPlayer player, World w, int x, int y, int z, short[] rgBa) {
+        if (player instanceof EntityPlayerMP) return super.updateHintParticleTint(player, w, x, y, z, rgBa);
+        if (player != getCurrentPlayer()) return false; // how?
+        HintParticleInfo info = new HintParticleInfo(x, y, z, null);
+        EntityFXBlockHint existing = allHints.inverse().get(info);
+        if (existing != null) {
+            existing.withColorTint(rgBa);
+            return true;
+        }
+        return false;
     }
 
     private static IIcon[] createIIconFromBlock(Block block, int meta) {
@@ -98,13 +107,11 @@ public class ClientProxy extends CommonProxy {
     private static List<EntityFXBlockHint> currentHints;
 
     public static void onHintDead(EntityFXBlockHint fx) {
-        if (ConfigurationHandler.INSTANCE.isRemoveCollidingHologram())
-            allHints.remove(fx);
+        if (ConfigurationHandler.INSTANCE.isRemoveCollidingHologram()) allHints.remove(fx);
         for (Iterator<List<EntityFXBlockHint>> iterator = hintOwners.iterator(); iterator.hasNext(); ) {
             List<EntityFXBlockHint> list = iterator.next();
             if (list.remove(fx)) {
-                if (list.isEmpty())
-                    iterator.remove();
+                if (list.isEmpty()) iterator.remove();
                 break;
             }
         }
@@ -112,29 +119,24 @@ public class ClientProxy extends CommonProxy {
 
     @Override
     public void startHinting(World w) {
-        if (!w.isRemote)
-            return;
-        if (currentHints != null)
-            hintOwners.add(currentHints);
+        if (!w.isRemote) return;
+        if (currentHints != null) hintOwners.add(currentHints);
         currentHints = new LinkedList<>();
     }
 
     private void ensureHinting() {
-        if (currentHints == null)
-            currentHints = new LinkedList<>();
+        if (currentHints == null) currentHints = new LinkedList<>();
     }
 
     @Override
     public void endHinting(World w) {
-        if (!w.isRemote)
-            return;
+        if (!w.isRemote) return;
         while (!hintOwners.isEmpty() && hintOwners.size() >= ConfigurationHandler.INSTANCE.getMaxCoexistingHologram()) {
             List<EntityFXBlockHint> list = hintOwners.remove(0);
             list.forEach(EntityFXBlockHint::setDead);
             list.clear();
         }
-        if (!currentHints.isEmpty())
-            hintOwners.add(currentHints);
+        if (!currentHints.isEmpty()) hintOwners.add(currentHints);
         currentHints = null;
     }
 
@@ -143,6 +145,17 @@ public class ClientProxy extends CommonProxy {
         MinecraftForge.EVENT_BUS.register(new ForgeEventHandler());
     }
 
+    @Override
+    public long getOverworldTime() {
+        // there is no overworld, better just hope current world time is ok...
+        return Minecraft.getMinecraft().theWorld.getTotalWorldTime();
+    }
+
+    @Override
+    public void uploadChannels(ItemStack trigger) {
+        StructureLib.net.sendToServer(new SetChannelDataMessage(trigger));
+    }
+
     private static class HintParticleInfo {
         private final int x, y, z;
         private final List<EntityFXBlockHint> owner;

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

@@ -0,0 +1,54 @@
+package com.gtnewhorizon.structurelib;
+
+import com.gtnewhorizon.structurelib.net.UpdateHintParticleMessage;
+import cpw.mods.fml.common.event.FMLPreInitializationEvent;
+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.server.MinecraftServer;
+import net.minecraft.util.IIcon;
+import net.minecraft.world.World;
+
+public class CommonProxy {
+    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) {}
+
+    public void hintParticle(World w, int x, int y, int z, IIcon[] icons) {}
+
+    public void hintParticle(World w, int x, int y, int z, Block block, int meta) {}
+
+    public boolean updateHintParticleTint(EntityPlayer player, World w, int x, int y, int z, short[] rgBa) {
+        if (player instanceof EntityPlayerMP) { // just in case
+            StructureLib.net.sendTo(
+                    new UpdateHintParticleMessage(x, (short) y, z, rgBa[0], rgBa[1], rgBa[2], rgBa[3]),
+                    (EntityPlayerMP) player);
+            return true;
+        } else {
+            return false;
+        }
+    }
+
+    public EntityPlayer getCurrentPlayer() {
+        return null;
+    }
+
+    public boolean isCurrentPlayer(EntityPlayer player) {
+        return false;
+    }
+
+    public void addClientSideChatMessages(String... messages) {}
+
+    public void startHinting(World w) {}
+
+    public void endHinting(World w) {}
+
+    public void preInit(FMLPreInitializationEvent e) {}
+
+    public long getOverworldTime() {
+        return MinecraftServer.getServer().getEntityWorld().getTotalWorldTime();
+    }
+
+    public void uploadChannels(ItemStack trigger) {}
+}

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

@@ -3,19 +3,20 @@ package com.gtnewhorizon.structurelib;
 import cpw.mods.fml.client.event.ConfigChangedEvent;
 import cpw.mods.fml.common.FMLCommonHandler;
 import cpw.mods.fml.common.eventhandler.SubscribeEvent;
+import java.io.File;
+import java.util.Map;
 import net.minecraftforge.common.config.ConfigCategory;
 import net.minecraftforge.common.config.Configuration;
 import net.minecraftforge.common.config.Property;
 
-import java.io.File;
-import java.util.Map;
-
 public enum ConfigurationHandler {
     INSTANCE;
 
     private Configuration config;
     private int maxCoexistingHologram;
     private boolean removeCollidingHologram;
+    private int autoPlaceBudget;
+    private int autoPlaceInterval;
 
     ConfigurationHandler() {
         FMLCommonHandler.instance().bus().register(this);
@@ -39,8 +40,37 @@ public enum ConfigurationHandler {
     }
 
     private void loadConfig() {
-        maxCoexistingHologram = config.getInt("maxCoexisting", "client.hologram", 1, 1, 100, "An attempt will be made to prune old holograms when a new hologram is about to be projected");
-        removeCollidingHologram = config.getBoolean("removeColliding", "client.hologram", true, "An attempt will be made to remove an existing hologram if it collides with a new hologram.");
+        maxCoexistingHologram = config.getInt(
+                "maxCoexisting",
+                "client.hologram",
+                1,
+                1,
+                100,
+                "An attempt will be made to prune old holograms when a new hologram is about to be projected");
+        removeCollidingHologram = config.getBoolean(
+                "removeColliding",
+                "client.hologram",
+                true,
+                "An attempt will be made to remove an existing hologram if it collides with a new hologram.");
+        autoPlaceBudget = config.getInt(
+                "autoPlaceBudget",
+                "common.hologram",
+                25,
+                1,
+                200,
+                "Max number of elements can be placed in one round of auto place.\n"
+                        + "As expected, server side settings will overrides client settings.\n"
+                        + "Certain larger multi might increase these values beyond this configured value.");
+        autoPlaceInterval = config.getInt(
+                "autoPlaceInterval",
+                "common.hologram",
+                300,
+                0,
+                20000,
+                "Unit: milisecond. Minimal interval between two auto place round.\n"
+                        + "As expected, server side settings will overrides client settings.\n"
+                        + "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.");
 
         if (config.hasChanged()) {
             config.save();
@@ -62,6 +92,14 @@ public enum ConfigurationHandler {
         return removeCollidingHologram;
     }
 
+    public int getAutoPlaceBudget() {
+        return autoPlaceBudget;
+    }
+
+    public int getAutoPlaceInterval() {
+        return autoPlaceInterval;
+    }
+
     Configuration getConfig() {
         return config;
     }

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

@@ -1,16 +1,14 @@
 package com.gtnewhorizon.structurelib;
 
-import net.minecraftforge.common.config.Configuration;
-
-import javax.annotation.Nullable;
 import java.util.Arrays;
 import java.util.Objects;
+import javax.annotation.Nullable;
+import net.minecraftforge.common.config.Configuration;
 
 enum ConfigurationVersion {
     V1 {
         @Override
-        protected void step(Configuration c) {
-        }
+        protected void step(Configuration c) {}
     };
 
     private static final ConfigurationVersion[] VALUES = values();
@@ -32,7 +30,10 @@ enum ConfigurationVersion {
     }
 
     public static ConfigurationVersion identify(Configuration c) {
-        return Arrays.stream(VALUES).filter(v -> Objects.equals(c.getLoadedConfigVersion(), v.getVersionMarker())).findFirst().orElse(V1);
+        return Arrays.stream(VALUES)
+                .filter(v -> Objects.equals(c.getLoadedConfigVersion(), v.getVersionMarker()))
+                .findFirst()
+                .orElse(V1);
     }
 
     @Nullable

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

@@ -1,15 +1,13 @@
 package com.gtnewhorizon.structurelib;
 
 import cpw.mods.fml.client.IModGuiFactory;
+import java.util.Set;
 import net.minecraft.client.Minecraft;
 import net.minecraft.client.gui.GuiScreen;
 
-import java.util.Set;
-
 public class GuiFactory implements IModGuiFactory {
     @Override
-    public void initialize(Minecraft minecraftInstance) {
-    }
+    public void initialize(Minecraft minecraftInstance) {}
 
     @Override
     public Class<? extends GuiScreen> mainConfigGuiClass() {
@@ -25,4 +23,4 @@ public class GuiFactory implements IModGuiFactory {
     public RuntimeOptionGuiHandler getHandlerFor(RuntimeOptionCategoryElement element) {
         return null;
     }
-}
+}

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

@@ -0,0 +1,23 @@
+package com.gtnewhorizon.structurelib;
+
+import com.gtnewhorizon.structurelib.gui.GuiScreenConfigureChannels;
+import cpw.mods.fml.common.network.IGuiHandler;
+import net.minecraft.entity.player.EntityPlayer;
+import net.minecraft.world.World;
+
+public class GuiHandler implements IGuiHandler {
+    @Override
+    public Object getServerGuiElement(int ID, EntityPlayer player, World world, int x, int y, int z) {
+        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));
+            default:
+                return null;
+        }
+    }
+}

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

@@ -2,24 +2,30 @@ package com.gtnewhorizon.structurelib;
 
 import cpw.mods.fml.client.config.GuiConfig;
 import cpw.mods.fml.client.config.IConfigElement;
+import java.util.List;
+import java.util.stream.Collectors;
 import net.minecraft.client.gui.GuiScreen;
 import net.minecraftforge.common.config.ConfigElement;
 import net.minecraftforge.common.config.Configuration;
 
-import java.util.List;
-import java.util.stream.Collectors;
-
 public class GuiModConfig extends GuiConfig {
     public GuiModConfig(GuiScreen guiScreen) {
-        super(guiScreen, getConfigElements(), StructureLibAPI.MOD_ID, false, false, GuiConfig.getAbridgedConfigPath(ConfigurationHandler.INSTANCE.getConfig().toString()));
+        super(
+                guiScreen,
+                getConfigElements(),
+                StructureLibAPI.MOD_ID,
+                false,
+                false,
+                GuiConfig.getAbridgedConfigPath(
+                        ConfigurationHandler.INSTANCE.getConfig().toString()));
     }
 
     @SuppressWarnings("rawtypes")
     private static List<IConfigElement> getConfigElements() {
         final Configuration config = ConfigurationHandler.INSTANCE.getConfig();
         return config.getCategoryNames().stream()
-            .filter(name -> name.indexOf('.') == -1)
-            .map(name -> new ConfigElement(config.getCategory(name)))
-            .collect(Collectors.toList());
+                .filter(name -> name.indexOf('.') == -1)
+                .map(name -> new ConfigElement(config.getCategory(name)))
+                .collect(Collectors.toList());
     }
 }

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

@@ -1,15 +1,18 @@
 package com.gtnewhorizon.structurelib;
 
-import com.gtnewhorizon.structurelib.net.AlignmentMessage;
 import com.gtnewhorizon.structurelib.block.BlockHint;
+import com.gtnewhorizon.structurelib.command.CommandConfigureChannels;
 import com.gtnewhorizon.structurelib.item.ItemBlockHint;
 import com.gtnewhorizon.structurelib.item.ItemConstructableTrigger;
 import com.gtnewhorizon.structurelib.item.ItemFrontRotationTool;
-import com.gtnewhorizon.structurelib.proxy.CommonProxy;
+import com.gtnewhorizon.structurelib.net.AlignmentMessage;
+import com.gtnewhorizon.structurelib.net.SetChannelDataMessage;
+import com.gtnewhorizon.structurelib.net.UpdateHintParticleMessage;
 import com.gtnewhorizon.structurelib.util.XSTR;
 import cpw.mods.fml.common.Mod;
 import cpw.mods.fml.common.SidedProxy;
 import cpw.mods.fml.common.event.FMLPreInitializationEvent;
+import cpw.mods.fml.common.event.FMLServerStartingEvent;
 import cpw.mods.fml.common.network.NetworkRegistry;
 import cpw.mods.fml.common.network.simpleimpl.SimpleNetworkWrapper;
 import cpw.mods.fml.common.registry.GameRegistry;
@@ -20,28 +23,52 @@ import net.minecraft.creativetab.CreativeTabs;
 import net.minecraft.entity.player.EntityPlayer;
 import net.minecraft.item.Item;
 import net.minecraft.item.ItemBlock;
+import net.minecraft.launchwrapper.Launch;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 
 /**
  * This class does not contain a stable API. Refrain from using this class.
  */
-@Mod(modid = StructureLibAPI.MOD_ID, name = "StructureLib", version = "GRADLETOKEN_VERSION", acceptableRemoteVersions = "*", guiFactory = "com.gtnewhorizon.structurelib.GuiFactory")
+@Mod(
+        modid = StructureLibAPI.MOD_ID,
+        name = "StructureLib",
+        version = "GRADLETOKEN_VERSION",
+        acceptableRemoteVersions = "*",
+        guiFactory = "com.gtnewhorizon.structurelib.GuiFactory")
 public class StructureLib {
-    public static boolean DEBUG_MODE = Boolean.getBoolean("structurelib.debug");
+    public static boolean DEBUG_MODE;
+    public static boolean PANIC_MODE = Boolean.getBoolean("structurelib.panic");
     public static Logger LOGGER = LogManager.getLogger("StructureLib");
 
-    @SidedProxy(serverSide = "com.gtnewhorizon.structurelib.proxy.CommonProxy", clientSide = "com.gtnewhorizon.structurelib.proxy.ClientProxy")
+    @SidedProxy(
+            serverSide = "com.gtnewhorizon.structurelib.CommonProxy",
+            clientSide = "com.gtnewhorizon.structurelib.ClientProxy")
     static CommonProxy proxy;
+
     static SimpleNetworkWrapper net = NetworkRegistry.INSTANCE.newSimpleChannel(StructureLibAPI.MOD_ID);
 
     static {
-        net.registerMessage(AlignmentMessage.ServerHandler.class, AlignmentMessage.AlignmentQuery.class, 0, Side.SERVER);
+        net.registerMessage(
+                AlignmentMessage.ServerHandler.class, AlignmentMessage.AlignmentQuery.class, 0, Side.SERVER);
         net.registerMessage(AlignmentMessage.ClientHandler.class, AlignmentMessage.AlignmentData.class, 1, Side.CLIENT);
+        net.registerMessage(UpdateHintParticleMessage.Handler.class, UpdateHintParticleMessage.class, 2, Side.CLIENT);
+        net.registerMessage(SetChannelDataMessage.Handler.class, SetChannelDataMessage.class, 3, Side.SERVER);
+
+        try {
+            DEBUG_MODE = Boolean.parseBoolean(System.getProperty("structurelib.debug"));
+        } catch (IllegalArgumentException | NullPointerException e) {
+            // turn on debug by default in dev mode
+            // this will be overridden if above property is present and set to false
+            DEBUG_MODE = (Boolean) Launch.blackboard.get("fml.deobfuscatedEnvironment");
+        }
     }
 
     public static final XSTR RANDOM = new XSTR();
 
+    @Mod.Instance
+    static StructureLib INSTANCE;
+
     static Block blockHint;
     static Item itemBlockHint;
     static Item itemFrontRotationTool;
@@ -59,9 +86,18 @@ public class StructureLib {
         ConfigurationHandler.INSTANCE.init(e.getSuggestedConfigurationFile());
         GameRegistry.registerBlock(blockHint = new BlockHint(), ItemBlockHint.class, "blockhint");
         itemBlockHint = ItemBlock.getItemFromBlock(StructureLibAPI.getBlockHint());
-        GameRegistry.registerItem(itemFrontRotationTool = new ItemFrontRotationTool(), itemFrontRotationTool.getUnlocalizedName());
-        GameRegistry.registerItem(itemConstructableTrigger = new ItemConstructableTrigger(), itemConstructableTrigger.getUnlocalizedName());
+        GameRegistry.registerItem(
+                itemFrontRotationTool = new ItemFrontRotationTool(), itemFrontRotationTool.getUnlocalizedName());
+        GameRegistry.registerItem(
+                itemConstructableTrigger = new ItemConstructableTrigger(),
+                itemConstructableTrigger.getUnlocalizedName());
         proxy.preInit(e);
+        NetworkRegistry.INSTANCE.registerGuiHandler(instance(), new GuiHandler());
+    }
+
+    @Mod.EventHandler
+    public void serverStarting(FMLServerStartingEvent e) {
+        e.registerServerCommand(new CommandConfigureChannels());
     }
 
     public static void addClientSideChatMessages(String... messages) {
@@ -75,4 +111,16 @@ public class StructureLib {
     public static boolean isCurrentPlayer(EntityPlayer player) {
         return proxy.isCurrentPlayer(player);
     }
+
+    public static long getOverworldTime() {
+        return proxy.getOverworldTime();
+    }
+
+    public static StructureLib instance() {
+        return INSTANCE;
+    }
+
+    public CommonProxy proxy() {
+        return proxy;
+    }
 }

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

@@ -1,8 +1,11 @@
 package com.gtnewhorizon.structurelib;
 
-import com.gtnewhorizon.structurelib.net.AlignmentMessage;
+import static com.gtnewhorizon.structurelib.StructureLib.proxy;
+
 import com.gtnewhorizon.structurelib.alignment.IAlignmentProvider;
 import com.gtnewhorizon.structurelib.alignment.enumerable.ExtendedFacing;
+import com.gtnewhorizon.structurelib.net.AlignmentMessage;
+import com.gtnewhorizon.structurelib.structure.IItemSource;
 import cpw.mods.fml.common.network.NetworkRegistry;
 import net.minecraft.block.Block;
 import net.minecraft.entity.player.EntityPlayer;
@@ -12,8 +15,6 @@ import net.minecraft.item.ItemStack;
 import net.minecraft.util.IIcon;
 import net.minecraft.world.World;
 
-import static com.gtnewhorizon.structurelib.StructureLib.proxy;
-
 /**
  * A stable interface into the structure lib's internals. Backwards compatibility is maintained to the maximum extend possible.
  */
@@ -46,7 +47,7 @@ public class StructureLibAPI {
     }
 
     /**
-     * Start current batch of hinting. All hints particles generated during one batch will be considered to belong to one hologram.
+     * End current batch of hinting. All hints particles generated during one batch will be considered to belong to one hologram.
      * <p>
      * You don't need to call this unless your constructable tool didn't call {@link com.gtnewhorizon.structurelib.alignment.constructable.ConstructableUtility#handle(ItemStack, EntityPlayer, World, int, int, int, int)}
      */
@@ -70,6 +71,14 @@ public class StructureLibAPI {
         proxy.hintParticle(w, x, y, z, block, meta);
     }
 
+    /**
+     * Update the tint of given hint particle. Do nothing if particle not found.
+     * @return false if nothing updated. true if updated.
+     */
+    public static boolean updateHintParticleTint(EntityPlayer player, World w, int x, int y, int z, short[] RGBa) {
+        return proxy.updateHintParticleTint(player, w, x, y, z, RGBa);
+    }
+
     /**
      * Query the ExtendedFacing of this tile entity.
      * The ExtendedFacing will later be set onto given tile entity via {@link com.gtnewhorizon.structurelib.alignment.IAlignment#setExtendedFacing(ExtendedFacing)}
@@ -108,7 +117,6 @@ public class StructureLibAPI {
         StructureLib.net.sendToAllAround(new AlignmentMessage.AlignmentData(provider), targetPoint);
     }
 
-
     /**
      * Send the ExtendedFacing of this Tile Entity to all players in that dimension. Can be called on server side only.
      *
@@ -133,4 +141,15 @@ public class StructureLibAPI {
     public static void setDebugEnabled(boolean enabled) {
         StructureLib.DEBUG_MODE = enabled;
     }
+
+    /**
+     * Determines if given block can be replaced without much effort. The exact predicate clauses is not stable and
+     * will be changed, but the general idea will always stay the same.
+     *
+     * Use this in your {@link com.gtnewhorizon.structurelib.structure.IStructureElement#survivalPlaceBlock(Object, World, int, int, int, ItemStack, IItemSource, EntityPlayerMP, java.util.function.Consumer)}
+     */
+    public static boolean isBlockTriviallyReplaceable(World w, int x, int y, int z, EntityPlayerMP actor) {
+        // TODO extend this function a bit
+        return w.getBlock(x, y, z).isReplaceable(w, x, y, z);
+    }
 }

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

@@ -7,8 +7,7 @@ import net.minecraft.world.World;
 import net.minecraftforge.common.util.FakePlayer;
 
 public class AlignmentUtility {
-    private AlignmentUtility() {
-    }
+    private AlignmentUtility() {}
 
     public static boolean handle(EntityPlayer aPlayer, World aWorld, int aX, int aY, int aZ) {
         TileEntity tTileEntity = aWorld.getTileEntity(aX, aY, aZ);

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

@@ -57,7 +57,9 @@ public interface IAlignment extends IAlignmentLimits, IAlignmentProvider {
 
     default boolean toolSetDirection(ForgeDirection direction) {
         if (direction == null || direction == ForgeDirection.UNKNOWN) {
-            for (int i = 0, j = getDirection().ordinal() + 1, valuesLength = Direction.VALUES.length; i < valuesLength; i++) {
+            for (int i = 0, j = getDirection().ordinal() + 1, valuesLength = Direction.VALUES.length;
+                    i < valuesLength;
+                    i++) {
                 if (toolSetDirection(Direction.VALUES[(j + i) % valuesLength].getForgeDirection())) {
                     return true;
                 }
@@ -95,7 +97,8 @@ public interface IAlignment extends IAlignmentLimits, IAlignmentProvider {
             int rotations = Rotation.VALUES.length;
             for (int ii = 0, jj = getFlip().ordinal(); ii < flips; ii++) {
                 for (int i = 1, j = getRotation().ordinal(); i < rotations; i++) {
-                    if (checkedSetExtendedFacing(ExtendedFacing.of(getDirection(), Rotation.VALUES[(j + i) % rotations], Flip.VALUES[(jj + ii) % flips]))) {
+                    if (checkedSetExtendedFacing(ExtendedFacing.of(
+                            getDirection(), Rotation.VALUES[(j + i) % rotations], Flip.VALUES[(jj + ii) % flips]))) {
                         return true;
                     }
                 }
@@ -137,7 +140,9 @@ public interface IAlignment extends IAlignmentLimits, IAlignmentProvider {
 
     default boolean toolSetExtendedFacing(ExtendedFacing extendedFacing) {
         if (extendedFacing == null) {
-            for (int i = 0, j = getExtendedFacing().ordinal() + 1, valuesLength = ExtendedFacing.VALUES.length; i < valuesLength; i++) {
+            for (int i = 0, j = getExtendedFacing().ordinal() + 1, valuesLength = ExtendedFacing.VALUES.length;
+                    i < valuesLength;
+                    i++) {
                 if (checkedSetExtendedFacing(ExtendedFacing.VALUES[(j + i) % valuesLength])) {
                     return true;
                 }
@@ -179,9 +184,7 @@ public interface IAlignment extends IAlignmentLimits, IAlignmentProvider {
 
     @Override
     default boolean isNewExtendedFacingValid(ExtendedFacing alignment) {
-        return getAlignmentLimits().isNewExtendedFacingValid(
-            alignment.getDirection(),
-            alignment.getRotation(),
-            alignment.getFlip());
+        return getAlignmentLimits()
+                .isNewExtendedFacingValid(alignment.getDirection(), alignment.getRotation(), alignment.getFlip());
     }
 }

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

@@ -1,15 +1,14 @@
 package com.gtnewhorizon.structurelib.alignment;
 
+import static com.gtnewhorizon.structurelib.alignment.IAlignment.STATES_COUNT;
+
 import com.gtnewhorizon.structurelib.alignment.enumerable.ExtendedFacing;
 import com.gtnewhorizon.structurelib.alignment.enumerable.Flip;
 import com.gtnewhorizon.structurelib.alignment.enumerable.Rotation;
-import net.minecraftforge.common.util.ForgeDirection;
-
 import java.util.Arrays;
 import java.util.Optional;
 import java.util.function.Function;
-
-import static com.gtnewhorizon.structurelib.alignment.IAlignment.STATES_COUNT;
+import net.minecraftforge.common.util.ForgeDirection;
 
 public interface IAlignmentLimits {
 
@@ -18,10 +17,7 @@ public interface IAlignmentLimits {
     boolean isNewExtendedFacingValid(ForgeDirection direction, Rotation rotation, Flip flip);
 
     default boolean isNewExtendedFacingValid(ExtendedFacing alignment) {
-        return isNewExtendedFacingValid(
-            alignment.getDirection(),
-            alignment.getRotation(),
-            alignment.getFlip());
+        return isNewExtendedFacingValid(alignment.getDirection(), alignment.getRotation(), alignment.getFlip());
     }
 
     static IAlignmentLimits allowOnly(ExtendedFacing... allowedFacings) {
@@ -43,8 +39,7 @@ public interface IAlignmentLimits {
     class Builder {
         protected final boolean[] validStates = new boolean[STATES_COUNT];
 
-        private Builder() {
-        }
+        private Builder() {}
 
         public static Builder allowAll() {
             Builder b = new Builder();
@@ -59,12 +54,16 @@ public interface IAlignmentLimits {
         }
 
         public Builder deny(ForgeDirection fd) {
-            ExtendedFacing.getAllWith(fd).stream().mapToInt(ExtendedFacing::getIndex).forEach(v -> validStates[v] = false);
+            ExtendedFacing.getAllWith(fd).stream()
+                    .mapToInt(ExtendedFacing::getIndex)
+                    .forEach(v -> validStates[v] = false);
             return this;
         }
 
         public Builder allow(ForgeDirection fd) {
-            ExtendedFacing.getAllWith(fd).stream().mapToInt(ExtendedFacing::getIndex).forEach(v -> validStates[v] = true);
+            ExtendedFacing.getAllWith(fd).stream()
+                    .mapToInt(ExtendedFacing::getIndex)
+                    .forEach(v -> validStates[v] = true);
             return this;
         }
 
@@ -79,22 +78,30 @@ public interface IAlignmentLimits {
         }
 
         public Builder deny(Rotation fd) {
-            ExtendedFacing.getAllWith(fd).stream().mapToInt(ExtendedFacing::getIndex).forEach(v -> validStates[v] = false);
+            ExtendedFacing.getAllWith(fd).stream()
+                    .mapToInt(ExtendedFacing::getIndex)
+                    .forEach(v -> validStates[v] = false);
             return this;
         }
 
         public Builder allow(Rotation fd) {
-            ExtendedFacing.getAllWith(fd).stream().mapToInt(ExtendedFacing::getIndex).forEach(v -> validStates[v] = true);
+            ExtendedFacing.getAllWith(fd).stream()
+                    .mapToInt(ExtendedFacing::getIndex)
+                    .forEach(v -> validStates[v] = true);
             return this;
         }
 
         public Builder deny(Flip fd) {
-            ExtendedFacing.getAllWith(fd).stream().mapToInt(ExtendedFacing::getIndex).forEach(v -> validStates[v] = false);
+            ExtendedFacing.getAllWith(fd).stream()
+                    .mapToInt(ExtendedFacing::getIndex)
+                    .forEach(v -> validStates[v] = false);
             return this;
         }
 
         public Builder allow(Flip fd) {
-            ExtendedFacing.getAllWith(fd).stream().mapToInt(ExtendedFacing::getIndex).forEach(v -> validStates[v] = true);
+            ExtendedFacing.getAllWith(fd).stream()
+                    .mapToInt(ExtendedFacing::getIndex)
+                    .forEach(v -> validStates[v] = true);
             return this;
         }
 

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

@@ -5,4 +5,4 @@ import javax.annotation.Nullable;
 public interface IAlignmentProvider {
     @Nullable
     IAlignment getAlignment();
-}
+}

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

@@ -1,12 +1,12 @@
 package com.gtnewhorizon.structurelib.alignment;
 
-import com.gtnewhorizon.structurelib.util.Vec3Impl;
+import static java.lang.Math.abs;
+
 import com.gtnewhorizon.structurelib.alignment.enumerable.Direction;
+import com.gtnewhorizon.structurelib.util.Vec3Impl;
 import net.minecraft.util.Vec3;
 import net.minecraftforge.common.util.ForgeDirection;
 
-import static java.lang.Math.abs;
-
 public class IntegerAxisSwap {
     private final Vec3Impl forFirstAxis;
     private final Vec3Impl forSecondAxis;
@@ -16,46 +16,66 @@ public class IntegerAxisSwap {
         this.forFirstAxis = Direction.getAxisVector(forFirstAxis);
         this.forSecondAxis = Direction.getAxisVector(forSecondAxis);
         this.forThirdAxis = Direction.getAxisVector(forThirdAxis);
-        if (abs(this.forFirstAxis.get0()) + abs(this.forSecondAxis.get0()) + abs(this.forThirdAxis.get0()) != 1 ||
-            abs(this.forFirstAxis.get1()) + abs(this.forSecondAxis.get1()) + abs(this.forThirdAxis.get1()) != 1 ||
-            abs(this.forFirstAxis.get2()) + abs(this.forSecondAxis.get2()) + abs(this.forThirdAxis.get2()) != 1) {
-            throw new IllegalArgumentException("Axis are overlapping/missing! " +
-                forFirstAxis.name() + " " +
-                forSecondAxis.name() + " " +
-                forThirdAxis.name());
+        if (abs(this.forFirstAxis.get0()) + abs(this.forSecondAxis.get0()) + abs(this.forThirdAxis.get0()) != 1
+                || abs(this.forFirstAxis.get1()) + abs(this.forSecondAxis.get1()) + abs(this.forThirdAxis.get1()) != 1
+                || abs(this.forFirstAxis.get2()) + abs(this.forSecondAxis.get2()) + abs(this.forThirdAxis.get2())
+                        != 1) {
+            throw new IllegalArgumentException("Axis are overlapping/missing! " + forFirstAxis.name()
+                    + " " + forSecondAxis.name()
+                    + " " + forThirdAxis.name());
         }
     }
 
     public Vec3Impl translate(Vec3Impl point) {
         return new Vec3Impl(
-            forFirstAxis.get0() * point.get0() + forFirstAxis.get1() * point.get1() + forFirstAxis.get2() * point.get2(),
-            forSecondAxis.get0() * point.get0() + forSecondAxis.get1() * point.get1() + forSecondAxis.get2() * point.get2(),
-            forThirdAxis.get0() * point.get0() + forThirdAxis.get1() * point.get1() + forThirdAxis.get2() * point.get2()
-        );
+                forFirstAxis.get0() * point.get0()
+                        + forFirstAxis.get1() * point.get1()
+                        + forFirstAxis.get2() * point.get2(),
+                forSecondAxis.get0() * point.get0()
+                        + forSecondAxis.get1() * point.get1()
+                        + forSecondAxis.get2() * point.get2(),
+                forThirdAxis.get0() * point.get0()
+                        + forThirdAxis.get1() * point.get1()
+                        + forThirdAxis.get2() * point.get2());
     }
 
     public Vec3Impl inverseTranslate(Vec3Impl point) {
         return new Vec3Impl(
-            forFirstAxis.get0() * point.get0() + forSecondAxis.get0() * point.get1() + forThirdAxis.get0() * point.get2(),
-            forFirstAxis.get1() * point.get0() + forSecondAxis.get1() * point.get1() + forThirdAxis.get1() * point.get2(),
-            forFirstAxis.get2() * point.get0() + forSecondAxis.get2() * point.get1() + forThirdAxis.get2() * point.get2()
-        );
+                forFirstAxis.get0() * point.get0()
+                        + forSecondAxis.get0() * point.get1()
+                        + forThirdAxis.get0() * point.get2(),
+                forFirstAxis.get1() * point.get0()
+                        + forSecondAxis.get1() * point.get1()
+                        + forThirdAxis.get1() * point.get2(),
+                forFirstAxis.get2() * point.get0()
+                        + forSecondAxis.get2() * point.get1()
+                        + forThirdAxis.get2() * point.get2());
     }
 
     public Vec3 translate(Vec3 point) {
         return Vec3.createVectorHelper(
-            forFirstAxis.get0() * point.xCoord + forFirstAxis.get1() * point.yCoord + forFirstAxis.get2() * point.zCoord,
-            forSecondAxis.get0() * point.xCoord + forSecondAxis.get1() * point.yCoord + forSecondAxis.get2() * point.zCoord,
-            forThirdAxis.get0() * point.xCoord + forThirdAxis.get1() * point.yCoord + forThirdAxis.get2() * point.zCoord
-        );
+                forFirstAxis.get0() * point.xCoord
+                        + forFirstAxis.get1() * point.yCoord
+                        + forFirstAxis.get2() * point.zCoord,
+                forSecondAxis.get0() * point.xCoord
+                        + forSecondAxis.get1() * point.yCoord
+                        + forSecondAxis.get2() * point.zCoord,
+                forThirdAxis.get0() * point.xCoord
+                        + forThirdAxis.get1() * point.yCoord
+                        + forThirdAxis.get2() * point.zCoord);
     }
 
     public Vec3 inverseTranslate(Vec3 point) {
         return Vec3.createVectorHelper(
-            forFirstAxis.get0() * point.xCoord + forSecondAxis.get0() * point.yCoord + forThirdAxis.get0() * point.zCoord,
-            forFirstAxis.get1() * point.xCoord + forSecondAxis.get1() * point.yCoord + forThirdAxis.get1() * point.zCoord,
-            forFirstAxis.get2() * point.xCoord + forSecondAxis.get2() * point.yCoord + forThirdAxis.get2() * point.zCoord
-        );
+                forFirstAxis.get0() * point.xCoord
+                        + forSecondAxis.get0() * point.yCoord
+                        + forThirdAxis.get0() * point.zCoord,
+                forFirstAxis.get1() * point.xCoord
+                        + forSecondAxis.get1() * point.yCoord
+                        + forThirdAxis.get1() * point.zCoord,
+                forFirstAxis.get2() * point.xCoord
+                        + forSecondAxis.get2() * point.yCoord
+                        + forThirdAxis.get2() * point.zCoord);
     }
 
     public void translate(int[] point, int[] out) {

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

@@ -0,0 +1,107 @@
+package com.gtnewhorizon.structurelib.alignment.constructable;
+
+import static com.gtnewhorizon.structurelib.util.MiscUtils.getTagKeys;
+import static net.minecraftforge.common.util.Constants.NBT.TAG_COMPOUND;
+
+import com.gtnewhorizon.structurelib.StructureLib;
+import java.util.Locale;
+import java.util.Map.Entry;
+import java.util.stream.Stream;
+import net.minecraft.init.Items;
+import net.minecraft.item.ItemStack;
+import net.minecraft.nbt.NBTTagCompound;
+import net.minecraftforge.common.util.Constants.NBT;
+import org.apache.commons.lang3.tuple.ImmutablePair;
+
+public class ChannelDataAccessor {
+    private static final String SECONDARY_HINT_TAG = "channels";
+
+    private ChannelDataAccessor() {}
+
+    public static ItemStack withChannel(ItemStack masterStack, String channel) {
+        if (channel == null || channel.isEmpty()) throw new IllegalArgumentException();
+        if (StructureLib.DEBUG_MODE && !channel.toLowerCase(Locale.ROOT).equals(channel))
+            throw new IllegalArgumentException("Channel name can be lower case ONLY");
+        if (!masterStack.hasTagCompound()
+                || !masterStack.stackTagCompound.hasKey(SECONDARY_HINT_TAG, TAG_COMPOUND)
+                || !masterStack
+                        .stackTagCompound
+                        .getCompoundTag(SECONDARY_HINT_TAG)
+                        .hasKey(channel, NBT.TAG_INT)) return masterStack;
+        ItemStack ret = new ItemStack(
+                masterStack.getItem(),
+                masterStack.stackTagCompound.getCompoundTag(SECONDARY_HINT_TAG).getInteger(channel),
+                Items.feather.getDamage(masterStack));
+        ret.setTagCompound(masterStack.stackTagCompound);
+        return ret;
+    }
+
+    public static boolean hasSubChannel(ItemStack masterStack) {
+        return masterStack.hasTagCompound() && masterStack.stackTagCompound.hasKey(SECONDARY_HINT_TAG, TAG_COMPOUND);
+    }
+
+    public static boolean hasSubChannel(ItemStack masterStack, String channel) {
+        if (StructureLib.DEBUG_MODE && !channel.toLowerCase(Locale.ROOT).equals(channel))
+            throw new IllegalArgumentException("Channel name can be lower case ONLY");
+        return !channel.isEmpty()
+                && masterStack.hasTagCompound()
+                && masterStack.stackTagCompound.hasKey(SECONDARY_HINT_TAG, TAG_COMPOUND)
+                && masterStack
+                        .stackTagCompound
+                        .getCompoundTag(SECONDARY_HINT_TAG)
+                        .hasKey(channel, NBT.TAG_INT);
+    }
+
+    public static int getChannelData(ItemStack masterStack, String channel) {
+        if (channel == null || channel.isEmpty()) throw new IllegalArgumentException();
+        if (StructureLib.DEBUG_MODE && !channel.toLowerCase(Locale.ROOT).equals(channel))
+            throw new IllegalArgumentException("Channel name can be lower case ONLY");
+        if (!masterStack.hasTagCompound()
+                || !masterStack.stackTagCompound.hasKey(SECONDARY_HINT_TAG, TAG_COMPOUND)
+                || !masterStack
+                        .stackTagCompound
+                        .getCompoundTag(SECONDARY_HINT_TAG)
+                        .hasKey(channel, NBT.TAG_INT)) return masterStack.stackSize;
+        return masterStack.stackTagCompound.getCompoundTag(SECONDARY_HINT_TAG).getInteger(channel);
+    }
+
+    public static void setChannelData(ItemStack masterStack, String channel, int data) {
+        if (channel == null || channel.isEmpty()) throw new IllegalArgumentException();
+        if (StructureLib.DEBUG_MODE && !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());
+        main.getCompoundTag(SECONDARY_HINT_TAG).setInteger(channel, data);
+    }
+
+    public static void unsetChannelData(ItemStack masterStack, String channel) {
+        if (channel == null || channel.isEmpty()) throw new IllegalArgumentException();
+        if (StructureLib.DEBUG_MODE && !channel.toLowerCase(Locale.ROOT).equals(channel))
+            throw new IllegalArgumentException("Channel name can be lower case ONLY");
+        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());
+        NBTTagCompound tag = main.getCompoundTag(SECONDARY_HINT_TAG);
+        tag.removeTag(channel);
+        if (tag.hasNoTags()) main.removeTag(SECONDARY_HINT_TAG);
+        if (main.hasNoTags()) masterStack.stackTagCompound = null;
+    }
+
+    public static void wipeChannelData(ItemStack masterStack) {
+        if (masterStack.stackTagCompound != null) masterStack.stackTagCompound.removeTag(SECONDARY_HINT_TAG);
+    }
+
+    public static Stream<Entry<String, Integer>> iterateChannelData(ItemStack masterStack) {
+        if (!hasSubChannel(masterStack)) return Stream.empty();
+        NBTTagCompound tag = masterStack.stackTagCompound.getCompoundTag(SECONDARY_HINT_TAG);
+        return getTagKeys(tag).stream().map(s -> new ImmutablePair<>(s, tag.getInteger(s)));
+    }
+
+    public static int countChannelData(ItemStack masterStack) {
+        if (!hasSubChannel(masterStack)) return 0;
+        NBTTagCompound tag = masterStack.stackTagCompound.getCompoundTag(SECONDARY_HINT_TAG);
+        return tag.func_150296_c().size();
+    }
+}

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

@@ -1,82 +1,116 @@
 package com.gtnewhorizon.structurelib.alignment.constructable;
 
+import com.gtnewhorizon.structurelib.ConfigurationHandler;
 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.structure.IItemSource;
+import java.util.WeakHashMap;
 import net.minecraft.entity.player.EntityPlayer;
 import net.minecraft.entity.player.EntityPlayerMP;
 import net.minecraft.item.ItemStack;
 import net.minecraft.tileentity.TileEntity;
+import net.minecraft.util.ChatComponentTranslation;
 import net.minecraft.world.World;
 import net.minecraftforge.common.util.FakePlayer;
 import net.minecraftforge.common.util.ForgeDirection;
 
 public class ConstructableUtility {
-    private ConstructableUtility() {
 
-    }
+    private static final WeakHashMap<EntityPlayerMP, Long> lastUse = new WeakHashMap<>();
+    private static long clientSideLastUse = 0;
 
-    public static boolean handle(ItemStack aStack, EntityPlayer aPlayer, World aWorld, int aX, int aY, int aZ, int aSide) {
+    private ConstructableUtility() {}
+
+    public static boolean handle(
+            ItemStack aStack, EntityPlayer aPlayer, World aWorld, int aX, int aY, int aZ, int aSide) {
         StructureLibAPI.startHinting(aWorld);
         boolean ret = handle0(aStack, aPlayer, aWorld, aX, aY, aZ, aSide);
         StructureLibAPI.endHinting(aWorld);
         return ret;
     }
 
-    private static boolean handle0(ItemStack aStack, EntityPlayer aPlayer, World aWorld, int aX, int aY, int aZ, int aSide) {
+    private static boolean handle0(
+            ItemStack aStack, EntityPlayer aPlayer, World aWorld, int aX, int aY, int aZ, int aSide) {
         TileEntity tTileEntity = aWorld.getTileEntity(aX, aY, aZ);
         if (tTileEntity == null || aPlayer instanceof FakePlayer) {
             return aPlayer instanceof EntityPlayerMP;
         }
         if (aPlayer instanceof EntityPlayerMP) {
-            //struct gen
-            if (aPlayer.isSneaking() && aPlayer.capabilities.isCreativeMode) {
-                if (tTileEntity instanceof IConstructableProvider) {
-                    IConstructable constructable = ((IConstructableProvider) tTileEntity).getConstructable();
-                    if (constructable != null) {
-                        constructable.construct(aStack, false);
-                    }
-                } else if (tTileEntity instanceof IConstructable) {
-                    ((IConstructable) tTileEntity).construct(aStack, false);
-                } else if (IMultiblockInfoContainer.contains(tTileEntity.getClass())) {
-                    IMultiblockInfoContainer<TileEntity> iMultiblockInfoContainer = IMultiblockInfoContainer.get(tTileEntity.getClass());
-                    if (tTileEntity instanceof IAlignment) {
-                        iMultiblockInfoContainer.construct(aStack, false, tTileEntity,
-                            ((IAlignment) tTileEntity).getExtendedFacing());
-                    } else {
-                        iMultiblockInfoContainer.construct(aStack, false, tTileEntity,
-                            ExtendedFacing.of(ForgeDirection.getOrientation(aSide)));
-                    }
+            // not sneaking - client side will generate hologram. nothing to do on server side
+            if (!aPlayer.isSneaking()) return true;
+
+            long timePast = System.currentTimeMillis() - getLastUseMilis(aPlayer);
+            if (timePast < ConfigurationHandler.INSTANCE.getAutoPlaceInterval()) {
+                aPlayer.addChatComponentMessage(new ChatComponentTranslation(
+                        "item.structurelib.constructableTrigger.too_fast",
+                        ConfigurationHandler.INSTANCE.getAutoPlaceInterval() - timePast));
+                return true;
+            }
+        } else if (!StructureLib.isCurrentPlayer(aPlayer)) {
+            return false;
+        }
+
+        IConstructable constructable = null;
+        if (tTileEntity instanceof IConstructableProvider)
+            constructable = ((IConstructableProvider) tTileEntity).getConstructable();
+        else if (tTileEntity instanceof IConstructable) {
+            constructable = (IConstructable) tTileEntity;
+        } else if (IMultiblockInfoContainer.contains(tTileEntity.getClass())) {
+            ExtendedFacing facing = tTileEntity instanceof IAlignment
+                    ? ((IAlignment) tTileEntity).getExtendedFacing()
+                    : ExtendedFacing.of(ForgeDirection.getOrientation(aSide));
+            constructable = IMultiblockInfoContainer.<TileEntity>get(tTileEntity.getClass())
+                    .toConstructable(tTileEntity, facing);
+        }
+
+        if (constructable == null) return false;
+
+        if (aPlayer instanceof EntityPlayerMP) {
+            EntityPlayerMP playerMP = (EntityPlayerMP) aPlayer;
+            // server side and sneaking (already checked above)
+            // do construct
+            if (aPlayer.capabilities.isCreativeMode) {
+                constructable.construct(aStack, false);
+            } else if (constructable instanceof ISurvivalConstructable) {
+                int built = ((ISurvivalConstructable) constructable)
+                        .survivalConstruct(
+                                aStack,
+                                ConfigurationHandler.INSTANCE.getAutoPlaceBudget(),
+                                IItemSource.fromPlayer(playerMP),
+                                playerMP);
+                if (built > 0) {
+                    playerMP.addChatMessage(new ChatComponentTranslation("structurelib.autoplace.built_stat", built));
+                } else if (built == -1) {
+                    playerMP.addChatMessage(new ChatComponentTranslation("structurelib.autoplace.complete"));
                 }
+                setLastUseMilis(aPlayer);
+            } else {
+                playerMP.addChatMessage(new ChatComponentTranslation("structurelib.autoplace.error.not_enabled"));
             }
             return true;
-        } else if (StructureLib.isCurrentPlayer(aPlayer)) {//particles and text client side
-            //if ((!aPlayer.isSneaking() || !aPlayer.capabilities.isCreativeMode)) {
-            if (tTileEntity instanceof IConstructableProvider) {
-                IConstructable constructable = ((IConstructableProvider) tTileEntity).getConstructable();
-                if (constructable != null) {
-                    constructable.construct(aStack, true);
-                    StructureLib.addClientSideChatMessages(constructable.getStructureDescription(aStack));
-                }
-            } else if (tTileEntity instanceof IConstructable) {
-                IConstructable constructable = (IConstructable) tTileEntity;
-                constructable.construct(aStack, true);
-                StructureLib.addClientSideChatMessages(constructable.getStructureDescription(aStack));
-                return false;
-            } else if (IMultiblockInfoContainer.contains(tTileEntity.getClass())) {
-                IMultiblockInfoContainer<TileEntity> iMultiblockInfoContainer = IMultiblockInfoContainer.get(tTileEntity.getClass());
-                if (tTileEntity instanceof IAlignment) {
-                    iMultiblockInfoContainer.construct(aStack, true, tTileEntity,
-                        ((IAlignment) tTileEntity).getExtendedFacing());
-                } else {
-                    iMultiblockInfoContainer.construct(aStack, true, tTileEntity,
-                        ExtendedFacing.of(ForgeDirection.getOrientation(aSide)));
-                }
-                StructureLib.addClientSideChatMessages(IMultiblockInfoContainer.get(tTileEntity.getClass()).getDescription(aStack));
-                return false;
-            }
         }
+        // client side
+        // particles and text
+        constructable.construct(aStack, true);
+        if (System.currentTimeMillis() - getLastUseMilis(aPlayer) >= 300)
+            StructureLib.addClientSideChatMessages(constructable.getStructureDescription(aStack));
+        setLastUseMilis(aPlayer);
         return false;
     }
+
+    private static void setLastUseMilis(EntityPlayer aPlayer) {
+        if (!(aPlayer instanceof EntityPlayerMP))
+            // assume client side
+            clientSideLastUse = System.currentTimeMillis();
+        else lastUse.put((EntityPlayerMP) aPlayer, System.currentTimeMillis());
+    }
+
+    private static long getLastUseMilis(EntityPlayer aPlayer) {
+        if (!(aPlayer instanceof EntityPlayerMP))
+            // assume client side
+            return clientSideLastUse;
+        return lastUse.getOrDefault(aPlayer, 0L);
+    }
 }

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

@@ -13,4 +13,3 @@ public interface IConstructable {
     @SideOnly(Side.CLIENT)
     String[] getStructureDescription(ItemStack stackSize);
 }
-

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

@@ -1,12 +1,14 @@
 package com.gtnewhorizon.structurelib.alignment.constructable;
 
 import com.gtnewhorizon.structurelib.alignment.enumerable.ExtendedFacing;
+import com.gtnewhorizon.structurelib.structure.IItemSource;
 import cpw.mods.fml.relauncher.Side;
 import cpw.mods.fml.relauncher.SideOnly;
+import java.util.HashMap;
+import net.minecraft.entity.player.EntityPlayerMP;
 import net.minecraft.item.ItemStack;
 import net.minecraft.tileentity.TileEntity;
-
-import java.util.HashMap;
+import net.minecraft.world.World;
 
 /**
  * To implement IConstructable on not own TileEntities
@@ -33,6 +35,59 @@ public interface IMultiblockInfoContainer<T> {
 
     void construct(ItemStack stackSize, boolean hintsOnly, T tileEntity, ExtendedFacing aSide);
 
+    /**
+     * Construct the structure using {@link com.gtnewhorizon.structurelib.structure.IStructureElement#survivalPlaceBlock(Object, World, int, int, int, ItemStack, IItemSource, EntityPlayerMP, java.util.function.Consumer)}
+     * @return -1 if done, a helping pointer
+     */
+    default int survivalConstruct(
+            ItemStack stackSize,
+            int elementBudge,
+            IItemSource source,
+            EntityPlayerMP actorProfile,
+            T tileEntity,
+            ExtendedFacing aSide) {
+        return -1;
+    }
+
     @SideOnly(Side.CLIENT)
     String[] getDescription(ItemStack stackSize);
+
+    /**
+     * Override this and return {@link #toConstructable(IMultiblockInfoContainer, Object, ExtendedFacing)} if
+     * {@link #survivalConstruct(ItemStack, int, IItemSource, EntityPlayerMP, Object, ExtendedFacing)} isn't a stub
+     */
+    default IConstructable toConstructable(T tileEntity, ExtendedFacing aSide) {
+        return new IConstructable() {
+            @Override
+            public void construct(ItemStack stackSize, boolean hintsOnly) {
+                IMultiblockInfoContainer.this.construct(stackSize, hintsOnly, tileEntity, aSide);
+            }
+
+            @Override
+            public String[] getStructureDescription(ItemStack stackSize) {
+                return IMultiblockInfoContainer.this.getDescription(stackSize);
+            }
+        };
+    }
+
+    static <T> ISurvivalConstructable toConstructable(
+            IMultiblockInfoContainer<T> thiz, T tileEntity, ExtendedFacing aSide) {
+        return new ISurvivalConstructable() {
+            @Override
+            public int survivalConstruct(
+                    ItemStack stackSize, int elementBudget, IItemSource source, EntityPlayerMP actor) {
+                return thiz.survivalConstruct(stackSize, elementBudget, source, actor, tileEntity, aSide);
+            }
+
+            @Override
+            public void construct(ItemStack stackSize, boolean hintsOnly) {
+                thiz.construct(stackSize, hintsOnly, tileEntity, aSide);
+            }
+
+            @Override
+            public String[] getStructureDescription(ItemStack stackSize) {
+                return thiz.getDescription(stackSize);
+            }
+        };
+    }
 }

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

@@ -0,0 +1,17 @@
+package com.gtnewhorizon.structurelib.alignment.constructable;
+
+import com.gtnewhorizon.structurelib.structure.IItemSource;
+import net.minecraft.entity.player.EntityPlayerMP;
+import net.minecraft.item.ItemStack;
+import net.minecraft.world.World;
+
+public interface ISurvivalConstructable extends IConstructable {
+    /**
+     * Construct the structure using {@link com.gtnewhorizon.structurelib.structure.IStructureElement#survivalPlaceBlock(Object, World, int, int, int, ItemStack, IItemSource, EntityPlayerMP, java.util.function.Consumer)}
+     *
+     * @param elementBudget The server configured element budget. You can tune this up a bit if the structure is too big, but
+     *                      generally should not be a 4 digits number to not overwhelm the server
+     * @return -1 if done, otherwise number of elements placed this round
+     */
+    int survivalConstruct(ItemStack stackSize, int elementBudget, IItemSource source, EntityPlayerMP actor);
+}

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

@@ -1,21 +1,20 @@
 package com.gtnewhorizon.structurelib.alignment.enumerable;
 
-import com.google.common.collect.ImmutableSet;
-import com.gtnewhorizon.structurelib.alignment.IAlignment;
-import com.gtnewhorizon.structurelib.alignment.IntegerAxisSwap;
-import com.gtnewhorizon.structurelib.util.Vec3Impl;
-import net.minecraft.util.StatCollector;
-import net.minecraft.util.Vec3;
-import net.minecraftforge.common.util.ForgeDirection;
-
-import java.util.*;
-
 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 com.google.common.collect.ImmutableSet;
+import com.gtnewhorizon.structurelib.alignment.IAlignment;
+import com.gtnewhorizon.structurelib.alignment.IntegerAxisSwap;
+import com.gtnewhorizon.structurelib.util.Vec3Impl;
+import java.util.*;
+import net.minecraft.util.StatCollector;
+import net.minecraft.util.Vec3;
+import net.minecraftforge.common.util.ForgeDirection;
+
 public enum ExtendedFacing {
     DOWN_NORMAL_NONE("down normal none"),
     DOWN_NORMAL_HORIZONTAL("down normal horizontal"),
@@ -120,20 +119,34 @@ public enum ExtendedFacing {
     public static final int STATES_COUNT = VALUES.length;
 
     static {
-        stream(values()).forEach(extendedFacing ->
-            FOR_FACING.compute(extendedFacing.direction, ((forgeDirection, extendedFacings) -> {
-                if (extendedFacings == null) {
-                    extendedFacings = new ArrayList<>();
-                }
-                extendedFacings.add(extendedFacing);
-                return extendedFacings;
-            })));
+        stream(values())
+                .forEach(extendedFacing ->
+                        FOR_FACING.compute(extendedFacing.direction, ((forgeDirection, extendedFacings) -> {
+                            if (extendedFacings == null) {
+                                extendedFacings = new ArrayList<>();
+                            }
+                            extendedFacings.add(extendedFacing);
+                            return extendedFacings;
+                        })));
     }
 
-    private static final Map<String, ExtendedFacing> NAME_LOOKUP = stream(VALUES).collect(toMap(ExtendedFacing::getName2, (extendedFacing) -> extendedFacing));
-    private static final EnumMap<ForgeDirection, ImmutableSet<ExtendedFacing>> LOOKUP_BY_DIRECTION = stream(VALUES).collect(groupingBy(ExtendedFacing::getDirection, () -> new EnumMap<>(ForgeDirection.class), collectingAndThen(toSet(), ImmutableSet::copyOf)));
-    private static final EnumMap<Rotation, ImmutableSet<ExtendedFacing>> LOOKUP_BY_ROTATION = stream(VALUES).collect(groupingBy(ExtendedFacing::getRotation, () -> new EnumMap<>(Rotation.class), collectingAndThen(toSet(), ImmutableSet::copyOf)));
-    private static final EnumMap<Flip, ImmutableSet<ExtendedFacing>> LOOKUP_BY_FLIP = stream(VALUES).collect(groupingBy(ExtendedFacing::getFlip, () -> new EnumMap<>(Flip.class), collectingAndThen(toSet(), ImmutableSet::copyOf)));
+    private static final Map<String, ExtendedFacing> NAME_LOOKUP =
+            stream(VALUES).collect(toMap(ExtendedFacing::getName2, (extendedFacing) -> extendedFacing));
+    private static final EnumMap<ForgeDirection, ImmutableSet<ExtendedFacing>> LOOKUP_BY_DIRECTION = stream(VALUES)
+            .collect(groupingBy(
+                    ExtendedFacing::getDirection,
+                    () -> new EnumMap<>(ForgeDirection.class),
+                    collectingAndThen(toSet(), ImmutableSet::copyOf)));
+    private static final EnumMap<Rotation, ImmutableSet<ExtendedFacing>> LOOKUP_BY_ROTATION = stream(VALUES)
+            .collect(groupingBy(
+                    ExtendedFacing::getRotation,
+                    () -> new EnumMap<>(Rotation.class),
+                    collectingAndThen(toSet(), ImmutableSet::copyOf)));
+    private static final EnumMap<Flip, ImmutableSet<ExtendedFacing>> LOOKUP_BY_FLIP = stream(VALUES)
+            .collect(groupingBy(
+                    ExtendedFacing::getFlip,
+                    () -> new EnumMap<>(Flip.class),
+                    collectingAndThen(toSet(), ImmutableSet::copyOf)));
     private final ForgeDirection direction;
     private final ForgeDirection a, b, c;
     private final Rotation rotation;
@@ -182,7 +195,7 @@ public enum ExtendedFacing {
             default:
                 throw new RuntimeException("Is impossible...");
         }
-        switch (flip) {//This duplicates some axis swaps since flip boolean would do, but seems more convenient to use
+        switch (flip) { // This duplicates some axis swaps since flip boolean would do, but seems more convenient to use
             case HORIZONTAL:
                 a = a.getOpposite();
                 break;
@@ -341,7 +354,6 @@ public enum ExtendedFacing {
         integerAxisSwap.inverseTranslate(point, out);
     }
 
-
     /**
      * Translates world offset  to  relative front facing offset
      *

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

@@ -1,14 +1,14 @@
 package com.gtnewhorizon.structurelib.alignment.enumerable;
 
-import javax.annotation.Nonnull;
-import java.util.Locale;
-import java.util.Map;
-import java.util.Random;
-
 import static java.lang.Math.abs;
 import static java.util.Arrays.stream;
 import static java.util.stream.Collectors.toMap;
 
+import java.util.Locale;
+import java.util.Map;
+import java.util.Random;
+import javax.annotation.Nonnull;
+
 public enum Flip {
     NONE(3, "none"),
     HORIZONTAL(2, "horizontal"),

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

@@ -1,14 +1,14 @@
 package com.gtnewhorizon.structurelib.alignment.enumerable;
 
-import javax.annotation.Nonnull;
-import java.util.Locale;
-import java.util.Map;
-import java.util.Random;
-
 import static java.lang.Math.abs;
 import static java.util.Arrays.stream;
 import static java.util.stream.Collectors.toMap;
 
+import java.util.Locale;
+import java.util.Map;
+import java.util.Random;
+import javax.annotation.Nonnull;
+
 public enum Rotation {
     NORMAL(2, "normal"),
     CLOCKWISE(3, "clockwise"),
@@ -19,7 +19,8 @@ public enum Rotation {
     private final String name;
 
     public static final Rotation[] VALUES = values();
-    private static final Map<String, Rotation> NAME_LOOKUP = stream(VALUES).collect(toMap(Rotation::getName2, (rotation) -> rotation));
+    private static final Map<String, Rotation> NAME_LOOKUP =
+            stream(VALUES).collect(toMap(Rotation::getName2, (rotation) -> rotation));
 
     Rotation(int oppositeIn, String nameIn) {
         this.opposite = oppositeIn;

src/main/java/com/gtnewhorizon/structurelib/alignment/package-info.java

@@ -2,4 +2,4 @@
  * All public stuff in this package and its subpackages are considered part of the public API.
  * Backwards compatibility is maintained to the maximum extend possible.
  */
-package com.gtnewhorizon.structurelib.alignment;
+package com.gtnewhorizon.structurelib.alignment;

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

@@ -4,6 +4,7 @@ import com.gtnewhorizon.structurelib.StructureLib;
 import com.gtnewhorizon.structurelib.StructureLibAPI;
 import cpw.mods.fml.relauncher.Side;
 import cpw.mods.fml.relauncher.SideOnly;
+import java.util.List;
 import net.minecraft.block.Block;
 import net.minecraft.block.material.Material;
 import net.minecraft.client.renderer.texture.IIconRegister;
@@ -13,8 +14,6 @@ import net.minecraft.item.ItemStack;
 import net.minecraft.util.IIcon;
 import net.minecraft.world.IBlockAccess;
 
-import java.util.List;
-
 public class BlockHint extends Block {
     private static final IIcon[] hint = new IIcon[16];
 
@@ -26,7 +25,7 @@ public class BlockHint extends Block {
 
     @Override
     public void registerBlockIcons(IIconRegister aIconRegister) {
-        //super.registerBlockIcons(aIconRegister);
+        // super.registerBlockIcons(aIconRegister);
         hint[0] = aIconRegister.registerIcon(StructureLibAPI.MOD_ID + ":iconsets/HINT_0");
         hint[1] = aIconRegister.registerIcon(StructureLibAPI.MOD_ID + ":iconsets/HINT_1");
         hint[2] = aIconRegister.registerIcon(StructureLibAPI.MOD_ID + ":iconsets/HINT_2");

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

@@ -0,0 +1,121 @@
+package com.gtnewhorizon.structurelib.command;
+
+import com.gtnewhorizon.structurelib.alignment.constructable.ChannelDataAccessor;
+import com.gtnewhorizon.structurelib.item.ItemConstructableTrigger;
+import java.util.Arrays;
+import java.util.List;
+import java.util.stream.Collectors;
+import net.minecraft.command.CommandBase;
+import net.minecraft.command.ICommandSender;
+import net.minecraft.command.WrongUsageException;
+import net.minecraft.entity.player.EntityPlayerMP;
+import net.minecraft.item.ItemStack;
+import net.minecraft.util.ChatComponentText;
+import net.minecraft.util.ChatComponentTranslation;
+
+public class CommandConfigureChannels extends CommandBase {
+    @Override
+    public String getCommandName() {
+        return "sl_channel";
+    }
+
+    @Override
+    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";
+    }
+
+    @Override
+    public int getRequiredPermissionLevel() {
+        return 0;
+    }
+
+    @Override
+    public List<?> 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;
+    }
+
+    @Override
+    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;
+
+        ItemStack heldItem = player.getHeldItem();
+        if (heldItem == null || !(heldItem.getItem() instanceof ItemConstructableTrigger)) {
+            throw new WrongUsageException("must hold a hologram");
+        }
+
+        String channel;
+
+        switch (args[0]) {
+            case "getall":
+                if (!ChannelDataAccessor.hasSubChannel(heldItem)) {
+                    sender.addChatMessage(new ChatComponentText("No subchannel"));
+                } else {
+                    sender.addChatMessage(new ChatComponentTranslation(
+                            "item.structurelib.constructableTrigger.desc.lshift.0",
+                            ChannelDataAccessor.countChannelData(heldItem)));
+                    ChannelDataAccessor.iterateChannelData(heldItem)
+                            .map(e -> e.getKey() + ": " + e.getValue())
+                            .map(ChatComponentText::new)
+                            .forEach(player::addChatMessage);
+                }
+                return;
+            case "wipe":
+                ChannelDataAccessor.wipeChannelData(heldItem);
+                return;
+            case "get":
+            case "unset":
+                if (args.length < 2) throw new WrongUsageException(getCommandUsage(sender));
+                channel =
+                        args.length == 2 ? args[1] : Arrays.stream(args).skip(1).collect(Collectors.joining());
+                break;
+            case "set":
+                if (args.length < 3) throw new WrongUsageException(getCommandUsage(sender));
+                channel = args.length == 3
+                        ? args[1]
+                        : Arrays.stream(args).skip(1).limit(args.length - 2).collect(Collectors.joining());
+                break;
+            default:
+                throw new WrongUsageException(getCommandUsage(sender));
+        }
+
+        switch (args[0]) {
+            case "get":
+                if (ChannelDataAccessor.hasSubChannel(heldItem, channel))
+                    sender.addChatMessage(new ChatComponentText(
+                            channel + " value: " + ChannelDataAccessor.getChannelData(heldItem, channel)));
+                else sender.addChatMessage(new ChatComponentText(channel + " value: N/A"));
+                break;
+            case "clear":
+                if (ChannelDataAccessor.hasSubChannel(heldItem, channel))
+                    sender.addChatMessage(new ChatComponentText(channel + " no value"));
+                else {
+                    ChannelDataAccessor.unsetChannelData(heldItem, channel);
+                    sender.addChatMessage(new ChatComponentText(channel + " cleared"));
+                    player.inventoryContainer.detectAndSendChanges();
+                }
+                break;
+            case "set":
+                int value;
+                try {
+                    value = Integer.parseInt(args[args.length - 1]);
+                } catch (NumberFormatException e) {
+                    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);
+                player.inventoryContainer.detectAndSendChanges();
+                sender.addChatMessage(new ChatComponentText(channel + " value: " + value));
+                break;
+        }
+    }
+}

src/main/java/com/gtnewhorizon/structurelib/entity/fx/EntityFXBlockHint.java

@@ -1,7 +1,7 @@
 package com.gtnewhorizon.structurelib.entity.fx;
 
+import com.gtnewhorizon.structurelib.ClientProxy;
 import com.gtnewhorizon.structurelib.StructureLib;
-import com.gtnewhorizon.structurelib.proxy.ClientProxy;
 import cpw.mods.fml.relauncher.Side;
 import cpw.mods.fml.relauncher.SideOnly;
 import net.minecraft.block.Block;
@@ -59,7 +59,14 @@ public class EntityFXBlockHint extends EntityFX {
     }
 
     @Override
-    public void renderParticle(Tessellator tes, float subTickTime, float p_70539_3_, float p_70539_4_, float p_70539_5_, float p_70539_6_, float p_70539_7_) {
+    public void renderParticle(
+            Tessellator tes,
+            float subTickTime,
+            float p_70539_3_,
+            float p_70539_4_,
+            float p_70539_5_,
+            float p_70539_6_,
+            float p_70539_7_) {
         float size = .5f;
         float X = (float) (prevPosX + (posX - prevPosX) * (double) subTickTime - EntityFX.interpPosX);
         float Y = (float) (prevPosY + (posY - prevPosY) * (double) subTickTime - EntityFX.interpPosY) - size / 2;
@@ -68,8 +75,8 @@ public class EntityFXBlockHint extends EntityFX {
         GL11.glDepthMask(false);
         tes.setColorRGBA((int) (mRGBa[0] * .9F), (int) (mRGBa[1] * .95F), (int) (mRGBa[2] * 1F), 192);
 
-        //var8, var9 - X U
-        //var 10, var 11 - Y V
+        // var8, var9 - X U
+        // var 10, var 11 - Y V
         for (int i = 0; i < 6; i++) {
             if (icons[i] == null) {
                 continue;
@@ -78,7 +85,7 @@ public class EntityFXBlockHint extends EntityFX {
             double U = icons[i].getMaxU();
             double v = icons[i].getMinV();
             double V = icons[i].getMaxV();
-            switch (i) {//{DOWN, UP, NORTH, SOUTH, WEST, EAST}
+            switch (i) { // {DOWN, UP, NORTH, SOUTH, WEST, EAST}
                 case 0:
                     tes.addVertexWithUV(X, Y, Z + size, u, V);
                     tes.addVertexWithUV(X, Y, Z, u, v);

src/main/java/com/gtnewhorizon/structurelib/entity/fx/WeightlessParticleFX.java

@@ -7,7 +7,14 @@ import net.minecraft.world.World;
 
 @SideOnly(Side.CLIENT)
 public class WeightlessParticleFX extends EntityFX {
-    public WeightlessParticleFX(World p_i1205_1_, double p_i1205_2_, double p_i1205_4_, double p_i1205_6_, double p_i1205_8_, double p_i1205_10_, double p_i1205_12_) {
+    public WeightlessParticleFX(
+            World p_i1205_1_,
+            double p_i1205_2_,
+            double p_i1205_4_,
+            double p_i1205_6_,
+            double p_i1205_8_,
+            double p_i1205_10_,
+            double p_i1205_12_) {
         super(p_i1205_1_, p_i1205_2_, p_i1205_4_, p_i1205_6_, p_i1205_8_, p_i1205_10_, p_i1205_12_);
         this.motionX = p_i1205_8_ + (double) ((float) (Math.random() * 2.0D - 1.0D) * 0.05F);
         this.motionY = p_i1205_10_ + (double) ((float) (Math.random() * 2.0D - 1.0D) * 0.05F);
@@ -31,7 +38,7 @@ public class WeightlessParticleFX extends EntityFX {
         }
 
         this.setParticleTextureIndex(7 - this.particleAge * 8 / this.particleMaxAge);
-        //this.motionY += 0.004D;
+        // this.motionY += 0.004D;
         this.moveEntity(this.motionX, this.motionY, this.motionZ);
         this.motionX *= 0.8999999761581421D;
         this.motionY *= 0.8999999761581421D;

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

@@ -0,0 +1,400 @@
+package com.gtnewhorizon.structurelib.gui;
+
+import com.gtnewhorizon.structurelib.StructureLib;
+import com.gtnewhorizon.structurelib.alignment.constructable.ChannelDataAccessor;
+import com.gtnewhorizon.structurelib.gui.GuiScrollableList.IGuiScreen;
+import java.util.List;
+import java.util.Locale;
+import java.util.Map.Entry;
+import java.util.stream.Collectors;
+import net.minecraft.client.gui.GuiButton;
+import net.minecraft.client.gui.GuiScreen;
+import net.minecraft.client.gui.GuiTextField;
+import net.minecraft.client.renderer.Tessellator;
+import net.minecraft.client.resources.I18n;
+import net.minecraft.item.ItemStack;
+import net.minecraft.util.EnumChatFormatting;
+import net.minecraft.util.ResourceLocation;
+import org.apache.commons.lang3.StringUtils;
+import org.lwjgl.input.Keyboard;
+import org.lwjgl.input.Mouse;
+import org.lwjgl.opengl.GL11;
+
+public class GuiScreenConfigureChannels extends GuiScreen implements IGuiScreen {
+    private static final int KEY_MAX_WIDTH = 50;
+    private final ItemStack trigger;
+    private final GuiChannelsList list;
+    private GuiTextField key, value;
+    protected int guiTop, guiLeft;
+
+    public GuiScreenConfigureChannels(ItemStack trigger) {
+        this.trigger = trigger;
+        list = new GuiChannelsList(152, 100, 12, 12, 14);
+        list.addSelectionListener((list, selectedIndex) -> {
+            Entry<String, Integer> e = list.getElementAt(selectedIndex);
+            key.setText(e.getKey());
+            value.setText(e.getValue().toString());
+            updateButtons();
+        });
+    }
+
+    @Override
+    public void initGui() {
+        super.initGui();
+        // so you can keep holding backspace to delete a long sequence of chars
+        Keyboard.enableRepeatEvents(true);
+
+        guiLeft = (this.width - this.getXSize()) / 2;
+        guiTop = (this.height - this.getYSize()) / 2;
+
+        key = new GuiTextField(fontRendererObj, guiLeft + 45, guiTop + 119, 151 + 12 - 45, 12) {
+            @Override
+            public void writeText(String text) {
+                // force lower case
+                super.writeText(text.toLowerCase(Locale.ROOT));
+                updateButtons();
+            }
+
+            @Override
+            public void mouseClicked(int p_146192_1_, int p_146192_2_, int p_146192_3_) {
+                super.mouseClicked(p_146192_1_, p_146192_2_, p_146192_3_);
+                boolean flag = p_146192_1_ >= this.xPosition
+                        && p_146192_1_ < this.xPosition + this.width
+                        && p_146192_2_ >= this.yPosition
+                        && p_146192_2_ < this.yPosition + this.height;
+                if (flag && p_146192_3_ == 1) {
+                    key.setText("");
+                    value.setText("");
+                }
+            }
+
+            @Override
+            public void setText(String p_146180_1_) {
+                super.setText(p_146180_1_);
+                updateButtons();
+            }
+        };
+        value = new GuiTextField(fontRendererObj, guiLeft + 45, guiTop + 139, 151 + 12 - 45, 12) {
+            @Override
+            public void writeText(String text) {
+                // ignore write requests containing non digit characters.
+                // we don't accept decimals or negative numbers, so we can safely use isDigit instead of something more
+                // advanced
+                // use codePoints() in case someone pasted an emoji by mistake
+                if (text != null && text.codePoints().allMatch(Character::isDigit)) {
+                    super.writeText(text);
+                    updateButtons();
+                }
+            }
+
+            @Override
+            public void setFocused(boolean p_146195_1_) {
+                if (!p_146195_1_ && isFocused() && !StringUtils.isBlank(getText())) {
+                    int result;
+                    try {
+                        result = Math.max(Integer.parseInt(getText()), 1);
+                    } catch (NumberFormatException e) {
+                        result = 1;
+                    }
+                    setText(String.valueOf(result));
+                }
+                super.setFocused(p_146195_1_);
+            }
+
+            @Override
+            public void mouseClicked(int p_146192_1_, int p_146192_2_, int p_146192_3_) {
+                super.mouseClicked(p_146192_1_, p_146192_2_, p_146192_3_);
+                boolean flag = p_146192_1_ >= this.xPosition
+                        && p_146192_1_ < this.xPosition + this.width
+                        && p_146192_2_ >= this.yPosition
+                        && p_146192_2_ < this.yPosition + this.height;
+                if (flag && p_146192_3_ == 1) {
+                    setText("");
+                }
+            }
+
+            @Override
+            public void setText(String p_146180_1_) {
+                super.setText(p_146180_1_);
+                updateButtons();
+            }
+        };
+
+        list.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")));
+
+        updateButtons();
+    }
+
+    @Override
+    public int getGuiLeft() {
+        return guiLeft;
+    }
+
+    @Override
+    public int getGuiTop() {
+        return guiTop;
+    }
+
+    @Override
+    public int getXSize() {
+        return 176;
+    }
+
+    @Override
+    public int getYSize() {
+        return 188;
+    }
+
+    @Override
+    public void addButton(GuiButton button) {
+        getButtonList().add(button);
+    }
+
+    @Override
+    public void removeButton(GuiButton button) {
+        getButtonList().remove(button);
+    }
+
+    @Override
+    public int getOverlayOffsetX() {
+        return 0;
+    }
+
+    @Override
+    public void doActionPerformed(GuiButton but) {
+        actionPerformed(but);
+    }
+
+    @SuppressWarnings("unchecked")
+    private List<GuiButton> getButtonList() {
+        return buttonList;
+    }
+
+    @Override
+    public void handleMouseInput() {
+        int delta = Mouse.getEventDWheel();
+        if (delta != 0) list.handleDWheel(delta);
+        super.handleMouseInput();
+    }
+
+    @Override
+    protected void mouseClicked(int mX, int mY, int button) {
+        key.mouseClicked(mX, mY, button);
+        value.mouseClicked(mX, mY, button);
+        super.mouseClicked(mX, mY, button);
+    }
+
+    @Override
+    protected void keyTyped(char aChar, int aKey) {
+        switch (aKey) {
+            case Keyboard.KEY_TAB:
+                if (key.isFocused()) {
+                    key.setFocused(false);
+                    value.setFocused(true);
+                } else {
+                    key.setFocused(true);
+                    value.setFocused(false);
+                }
+                return;
+            case Keyboard.KEY_RETURN:
+            case Keyboard.KEY_NUMPADENTER:
+                GuiButton add = getButtonList().get(0);
+                if (add.enabled) doActionPerformed(add);
+                return;
+            case Keyboard.KEY_UP:
+                if (list.selectedIndex > 0) list.setSelection(list.selectedIndex - 1);
+                return;
+            case Keyboard.KEY_DOWN:
+                if (list.selectedIndex < list.getNumElements() - 1) list.setSelection(list.selectedIndex + 1);
+                return;
+        }
+        if (key.textboxKeyTyped(aChar, aKey)) {
+            updateButtons();
+            return;
+        }
+        if (value.textboxKeyTyped(aChar, aKey)) return;
+        super.keyTyped(aChar, aKey);
+    }
+
+    private void updateButtons() {
+        // this will be called from setText of key and value. NEVER UPDATE THE VALUE OF THESE HERE OR GET A
+        // STACKOVERFLOW!
+        boolean existing = ChannelDataAccessor.hasSubChannel(trigger, key.getText());
+        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());
+    }
+
+    private int getValue() {
+        try {
+            return Integer.parseInt(value.getText());
+        } catch (NumberFormatException e) {
+            return -1;
+        }
+    }
+
+    @Override
+    protected void actionPerformed(GuiButton btn) {
+        if (btn == null) return;
+        switch (btn.id) {
+            case 0:
+                int value = getValue();
+                if (value <= 0) return;
+                ChannelDataAccessor.setChannelData(trigger, key.getText(), value);
+                break;
+            case 1:
+                ChannelDataAccessor.unsetChannelData(trigger, key.getText());
+                break;
+            case 2:
+                ChannelDataAccessor.wipeChannelData(trigger);
+                break;
+        }
+        super.actionPerformed(btn);
+    }
+
+    @Override
+    public void onGuiClosed() {
+        super.onGuiClosed();
+        Keyboard.enableRepeatEvents(false);
+        StructureLib.instance().proxy().uploadChannels(trigger);
+    }
+
+    @Override
+    public void updateScreen() {
+        super.updateScreen();
+        key.updateCursorCounter();
+        value.updateCursorCounter();
+    }
+
+    @Override
+    public boolean doesGuiPauseGame() {
+        return false;
+    }
+
+    @Override
+    public void drawScreen(int mX, int mY, float partialTick) {
+        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);
+        key.drawTextBox();
+        fontRendererObj.drawString(
+                I18n.format("item.structurelib.constructableTrigger.gui.value"), guiLeft + 12, guiTop + 142, 0);
+        value.drawTextBox();
+    }
+
+    private class GuiChannelsList extends GuiScrollableList<Entry<String, Integer>> {
+        private List<Entry<String, Integer>> cache;
+
+        public GuiChannelsList(int width, int height, int originX, int originY, int slotHeight) {
+            super(width, height, originX, originY, slotHeight);
+        }
+
+        @Override
+        public Entry<String, Integer> getElementAt(int index) {
+            return ChannelDataAccessor.iterateChannelData(trigger)
+                    .sorted()
+                    .skip(index)
+                    .findFirst()
+                    .orElse(null);
+        }
+
+        @Override
+        public int getNumElements() {
+            return ChannelDataAccessor.countChannelData(trigger);
+        }
+
+        @Override
+        protected boolean elementClicked(int elementIndex, boolean doubleClick, int mXRelative, int mYRelative) {
+            if (mXRelative >= margin + 1
+                    && mXRelative <= margin + 5
+                    && mYRelative >= margin / 2 + 1
+                    && mYRelative <= margin / 2 + 5) {
+                Entry<String, Integer> e = getElementAt(elementIndex);
+                if (e != null) {
+                    ChannelDataAccessor.unsetChannelData(trigger, e.getKey());
+                    return false;
+                }
+            }
+            return super.elementClicked(elementIndex, doubleClick, mXRelative, mYRelative);
+        }
+
+        @Override
+        protected void prepareDrawElements() {
+            cache = ChannelDataAccessor.iterateChannelData(trigger).sorted().collect(Collectors.toList());
+        }
+
+        @Override
+        protected void drawElement(
+                int elementIndex, int x, int y, int height, Tessellator tessellator, boolean isHovering) {
+            if (elementIndex < 0 || elementIndex >= cache.size()) {
+                return;
+            }
+            Entry<String, Integer> e = cache.get(elementIndex);
+            if (e == null) return;
+            if (elementIndex > 0) {
+                // args x1, x2, y1, color
+                drawHorizontalLine(minX + 1, maxX - 1, y - 2, 0xffaaaaaa);
+            }
+            int keyMaxWidth = KEY_MAX_WIDTH * 2;
+            if (isHovering) {
+                mc.renderEngine.bindTexture(new ResourceLocation("structurelib", "textures/gui/channels.png"));
+                GL11.glColor4f(1, 1, 1, 1);
+                drawTexturedModalRect(x + margin + 1, y + margin / 2 + 1, 251, 251, 5, 5);
+            }
+            fontRendererObj.drawString(trim(e.getKey(), keyMaxWidth - 9), x + margin + 8, y + margin / 2, 0xffffff);
+            int valueX = x + margin + keyMaxWidth + margin;
+            fontRendererObj.drawString(trim(e.getValue().toString(), maxX - valueX), valueX, y + margin / 2, 0xffffff);
+        }
+
+        @Override
+        public void drawScreen(int mX, int mY, float partialTick) {
+            super.drawScreen(mX, mY, partialTick);
+            // 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

@@ -0,0 +1,443 @@
+package com.gtnewhorizon.structurelib.gui;
+
+import java.util.List;
+import java.util.concurrent.CopyOnWriteArrayList;
+import net.minecraft.client.Minecraft;
+import net.minecraft.client.gui.GuiButton;
+import net.minecraft.client.gui.ScaledResolution;
+import net.minecraft.client.renderer.Tessellator;
+import org.lwjgl.input.Mouse;
+import org.lwjgl.opengl.GL11;
+
+/**
+ * Shamelessly stolen from EnderCore, with some amount of edit to fit in one file. Original code from CrazyPants.
+ * <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
+ *
+ * Major edits
+ * <ul>
+ *     <li>Separate dwheel handling to handleDWheel. The next event calls often cause the mouse click event to
+ *     not fire on other widgets</li>
+ *     <li>scrollbar are now rendered within width</li>
+ *     <li>added prepareDrawElements</li>
+ * </ul>
+ *
+ * @author CrazyPants
+ * @author glee8e
+ */
+public abstract class GuiScrollableList<T> {
+    protected final int slotHeight;
+    private final Minecraft mc = Minecraft.getMinecraft();
+    protected int originX;
+    protected int originY;
+    protected int width;
+    protected int height;
+    protected int minY;
+    protected int maxY;
+    protected int minX;
+    protected int maxX;
+    protected int mouseX;
+    protected int mouseY;
+    protected int selectedIndex = -1;
+    protected int margin = 4;
+    protected List<ListSelectionListener<T>> listeners = new CopyOnWriteArrayList<>();
+    private int scrollUpButtonID;
+    private int scrollDownButtonID;
+    private float initialClickY = -2.0F;
+    private float scrollMultiplier;
+    private float amountScrolled;
+    private long lastClickedTime;
+
+    private boolean showSelectionBox = true;
+
+    public GuiScrollableList(int width, int height, int originX, int originY, int slotHeight) {
+        this.width = width;
+        this.height = height;
+        this.originX = originX;
+        this.originY = originY;
+        this.slotHeight = slotHeight;
+
+        minY = originY;
+        maxY = minY + height;
+        minX = originX;
+        maxX = minX + width;
+    }
+
+    public void onGuiInit(IGuiScreen gui) {
+        minY = originY + gui.getGuiTop();
+        maxY = minY + height;
+        minX = originX + gui.getGuiLeft();
+        maxX = minX + width;
+    }
+
+    public void addSelectionListener(ListSelectionListener<T> listener) {
+        listeners.add(listener);
+    }
+
+    public void removeSelectionListener(ListSelectionListener<T> listener) {
+        listeners.remove(listener);
+    }
+
+    public T getSelectedElement() {
+        return getElementAt(selectedIndex);
+    }
+
+    public void setSelection(T selection) {
+        setSelection(getIndexOf(selection));
+    }
+
+    public void setSelection(int index) {
+        if (index == selectedIndex) {
+            return;
+        }
+        selectedIndex = index;
+        for (ListSelectionListener<T> listener : listeners) {
+            listener.selectionChanged(this, selectedIndex);
+        }
+    }
+
+    public int getIndexOf(T element) {
+        if (element == null) {
+            return -1;
+        }
+        for (int i = 0; i < getNumElements(); i++) {
+            if (element.equals(getElementAt(i))) {
+                return i;
+            }
+        }
+        return -1;
+    }
+
+    public abstract T getElementAt(int index);
+
+    public abstract int getNumElements();
+
+    protected abstract void drawElement(
+            int elementIndex, int x, int y, int height, Tessellator tessellator, boolean isHovering);
+
+    protected boolean elementClicked(int elementIndex, boolean doubleClick, int mXRelative, int mYRelative) {
+        return true;
+    }
+
+    public void setShowSelectionBox(boolean val) {
+        showSelectionBox = val;
+    }
+
+    protected int getContentHeight() {
+        return getNumElements() * slotHeight;
+    }
+
+    public void setScrollButtonIds(int scrollUpButtonID, int scrollDownButtonID) {
+        this.scrollUpButtonID = scrollUpButtonID;
+        this.scrollDownButtonID = scrollDownButtonID;
+    }
+
+    private void clampScrollToBounds() {
+        int i = getContentOverhang();
+        if (i < 0) {
+            i *= -1;
+        }
+        if (amountScrolled < 0.0F) {
+            amountScrolled = 0.0F;
+        }
+        if (amountScrolled > i) {
+            amountScrolled = i;
+        }
+    }
+
+    public int getContentOverhang() {
+        return getContentHeight() - (height - margin);
+    }
+
+    public void actionPerformed(GuiButton b) {
+        if (b.enabled) {
+            if (b.id == scrollUpButtonID) {
+                amountScrolled -= slotHeight * 2 / 3;
+                initialClickY = -2.0F;
+                clampScrollToBounds();
+            } else if (b.id == scrollDownButtonID) {
+                amountScrolled += slotHeight * 2 / 3;
+                initialClickY = -2.0F;
+                clampScrollToBounds();
+            }
+        }
+    }
+
+    /**
+     * 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) {
+        this.mouseX = mX;
+        this.mouseY = mY;
+
+        processMouseEvents();
+
+        if (getContentOverhang() > 0) maxX = minX + width - 6;
+        else maxX = minX + width;
+
+        clampScrollToBounds();
+
+        GL11.glDisable(GL11.GL_LIGHTING);
+        GL11.glDisable(GL11.GL_FOG);
+
+        ScaledResolution sr = new ScaledResolution(mc, mc.displayWidth, mc.displayHeight);
+        int sx = minX * sr.getScaleFactor();
+        int sw = width * sr.getScaleFactor();
+        int sy = mc.displayHeight - (maxY * sr.getScaleFactor());
+        int sh = height * sr.getScaleFactor();
+        GL11.glEnable(GL11.GL_SCISSOR_TEST);
+        GL11.glScissor(sx, sy, sw, sh);
+
+        Tessellator tessellator = Tessellator.instance;
+        drawContainerBackground(tessellator);
+
+        int amountScrolled = (int) this.amountScrolled;
+        int contentYOffset = this.minY + margin - amountScrolled;
+
+        boolean hoveringPrecondition = mX >= minX && mX <= maxX && mY >= minY && mY <= maxY;
+
+        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) {
+
+                if (showSelectionBox && i == selectedIndex) {
+                    GL11.glColor4f(1.0F, 1.0F, 1.0F, 1.0F);
+                    GL11.glDisable(GL11.GL_TEXTURE_2D);
+                    tessellator.startDrawingQuads();
+                    tessellator.setColorOpaque_I(8421504);
+                    tessellator.addVertexWithUV(minX, elementY + slotHeight + 2, 0.0D, 0.0D, 1.0D);
+                    tessellator.addVertexWithUV(maxX, elementY + slotHeight + 2, 0.0D, 1.0D, 1.0D);
+                    tessellator.addVertexWithUV(maxX, elementY - 2, 0.0D, 1.0D, 0.0D);
+                    tessellator.addVertexWithUV(minX, elementY - 2, 0.0D, 0.0D, 0.0D);
+                    tessellator.setColorOpaque_I(0);
+                    tessellator.addVertexWithUV(minX + 1, elementY + slotHeight + 1, 0.0D, 0.0D, 1.0D);
+                    tessellator.addVertexWithUV(maxX - 1, elementY + slotHeight + 1, 0.0D, 1.0D, 1.0D);
+                    tessellator.addVertexWithUV(maxX - 1, elementY - 1, 0.0D, 1.0D, 0.0D);
+                    tessellator.addVertexWithUV(minX + 1, elementY - 1, 0.0D, 0.0D, 0.0D);
+                    tessellator.draw();
+                    GL11.glEnable(GL11.GL_TEXTURE_2D);
+                }
+
+                boolean isHovering = hoveringPrecondition && elementY - 2 <= mY && mY < elementY + slotHeight + 2;
+                drawElement(i, minX, elementY, slotHeight, tessellator, isHovering);
+            }
+        }
+
+        GL11.glDisable(GL11.GL_SCISSOR_TEST);
+
+        GL11.glDisable(GL11.GL_DEPTH_TEST);
+        GL11.glEnable(GL11.GL_BLEND);
+        GL11.glBlendFunc(GL11.GL_SRC_ALPHA, GL11.GL_ONE_MINUS_SRC_ALPHA);
+        GL11.glDisable(GL11.GL_ALPHA_TEST);
+        GL11.glShadeModel(GL11.GL_SMOOTH);
+        GL11.glDisable(GL11.GL_TEXTURE_2D);
+
+        tessellator.startDrawingQuads();
+        tessellator.setColorRGBA_I(0, 0);
+        tessellator.addVertexWithUV(this.minX, this.minY + margin, 0.0D, 0.0D, 1.0D);
+        tessellator.addVertexWithUV(this.maxX, this.minY + margin, 0.0D, 1.0D, 1.0D);
+        tessellator.setColorRGBA_I(0, 255);
+        tessellator.addVertexWithUV(this.maxX, this.minY, 0.0D, 1.0D, 0.0D);
+        tessellator.addVertexWithUV(this.minX, this.minY, 0.0D, 0.0D, 0.0D);
+        tessellator.draw();
+        tessellator.startDrawingQuads();
+        tessellator.setColorRGBA_I(0, 255);
+        tessellator.addVertexWithUV(this.minX, this.maxY, 0.0D, 0.0D, 1.0D);
+        tessellator.addVertexWithUV(this.maxX, this.maxY, 0.0D, 1.0D, 1.0D);
+        tessellator.setColorRGBA_I(0, 0);
+        tessellator.addVertexWithUV(this.maxX, this.maxY - margin, 0.0D, 1.0D, 0.0D);
+        tessellator.addVertexWithUV(this.minX, this.maxY - margin, 0.0D, 0.0D, 0.0D);
+        tessellator.draw();
+
+        renderScrollBar(tessellator);
+
+        GL11.glEnable(GL11.GL_TEXTURE_2D);
+        GL11.glShadeModel(GL11.GL_FLAT);
+        GL11.glEnable(GL11.GL_ALPHA_TEST);
+        GL11.glDisable(GL11.GL_BLEND);
+    }
+
+    protected void prepareDrawElements() {}
+
+    protected void renderScrollBar(Tessellator tessellator) {
+
+        int contentHeightOverBounds = getContentOverhang();
+        if (contentHeightOverBounds > 0) {
+
+            int clear = (maxY - minY) * (maxY - minY) / getContentHeight();
+
+            if (clear < 32) {
+                clear = 32;
+            }
+
+            if (clear > maxY - minY - 8) {
+                clear = maxY - minY - 8;
+            }
+
+            int y = (int) this.amountScrolled * (maxY - minY - clear) / contentHeightOverBounds + minY;
+            if (y < minY) {
+                y = minY;
+            }
+
+            GL11.glDisable(GL11.GL_TEXTURE_2D);
+            int scrollBarMinX = getScrollBarX();
+            int scrollBarMaxX = scrollBarMinX + 6;
+            tessellator.startDrawingQuads();
+
+            tessellator.setColorRGBA_I(0, 255);
+            tessellator.addVertexWithUV(scrollBarMinX, maxY, 0.0D, 0.0D, 1.0D);
+            tessellator.addVertexWithUV(scrollBarMaxX, maxY, 0.0D, 1.0D, 1.0D);
+            tessellator.addVertexWithUV(scrollBarMaxX, minY, 0.0D, 1.0D, 0.0D);
+            tessellator.addVertexWithUV(scrollBarMinX, minY, 0.0D, 0.0D, 0.0D);
+
+            tessellator.setColorRGBA_F(0.3f, 0.3f, 0.3f, 1);
+            tessellator.addVertexWithUV(scrollBarMinX, (y + clear), 0.0D, 0.0D, 1.0D);
+            tessellator.addVertexWithUV(scrollBarMaxX, (y + clear), 0.0D, 1.0D, 1.0D);
+            tessellator.addVertexWithUV(scrollBarMaxX, y, 0.0D, 1.0D, 0.0D);
+            tessellator.addVertexWithUV(scrollBarMinX, y, 0.0D, 0.0D, 0.0D);
+
+            tessellator.setColorRGBA_F(0.7f, 0.7f, 0.7f, 1);
+            tessellator.addVertexWithUV(scrollBarMinX, (y + clear - 1), 0.0D, 0.0D, 1.0D);
+            tessellator.addVertexWithUV((scrollBarMaxX - 1), (y + clear - 1), 0.0D, 1.0D, 1.0D);
+            tessellator.addVertexWithUV((scrollBarMaxX - 1), y, 0.0D, 1.0D, 0.0D);
+            tessellator.addVertexWithUV(scrollBarMinX, y, 0.0D, 0.0D, 0.0D);
+
+            tessellator.draw();
+            GL11.glEnable(GL11.GL_TEXTURE_2D);
+        }
+    }
+
+    private void processMouseEvents() {
+        if (Mouse.isButtonDown(0)) {
+            processMouseBown();
+        } else {
+            initialClickY = -1.0F;
+        }
+    }
+
+    public void handleDWheel(int mouseWheelDelta) {
+        if (!Mouse.isButtonDown(0)) {
+            if (mouseWheelDelta > 0) {
+                amountScrolled -= slotHeight / 2;
+            } else /* if (mouseWheelDelta < 0) */ {
+                amountScrolled += slotHeight / 2;
+            }
+        }
+    }
+
+    private void processMouseBown() {
+        int contentHeightOverBounds;
+        if (initialClickY == -1.0F) {
+
+            if (mouseY >= minY && mouseY <= maxY && mouseX >= minX && mouseX <= maxX + 6) {
+
+                boolean clickInBounds = true;
+
+                int y = mouseY - minY + (int) amountScrolled - margin;
+                int mouseOverElement = y / slotHeight;
+
+                if (mouseX >= minX
+                        && mouseX <= maxX
+                        && mouseOverElement >= 0
+                        && y >= 0
+                        && mouseOverElement < getNumElements()) {
+                    boolean doubleClick =
+                            mouseOverElement == selectedIndex && Minecraft.getSystemTime() - lastClickedTime < 250L;
+                    if (elementClicked(
+                            mouseOverElement, doubleClick, mouseX - minX, y - slotHeight * mouseOverElement)) {
+                        setSelection(mouseOverElement);
+                        lastClickedTime = Minecraft.getSystemTime();
+                    }
+                } else if (mouseX >= minX && mouseX <= maxX && y < 0) {
+                    clickInBounds = false;
+                }
+
+                int scrollBarMinX = getScrollBarX();
+                int scrollBarMaxX = scrollBarMinX + 6;
+                if (mouseX >= scrollBarMinX && mouseX <= scrollBarMaxX) {
+
+                    scrollMultiplier = -1.0F;
+                    contentHeightOverBounds = getContentOverhang();
+
+                    if (contentHeightOverBounds < 1) {
+                        contentHeightOverBounds = 1;
+                    }
+
+                    int empty = (int) ((float) ((maxY - minY) * (maxY - minY)) / (float) getContentHeight());
+                    if (empty < 32) {
+                        empty = 32;
+                    }
+                    if (empty > maxY - minY - 8) {
+                        empty = maxY - minY - 8;
+                    }
+                    scrollMultiplier /= (float) (maxY - minY - empty) / (float) contentHeightOverBounds;
+
+                } else {
+                    scrollMultiplier = 1.0F;
+                }
+
+                if (clickInBounds) {
+                    initialClickY = mouseY;
+                } else {
+                    initialClickY = -2.0F;
+                }
+
+            } else {
+                initialClickY = -2.0F;
+            }
+
+        } else if (initialClickY >= 0.0F) {
+            // Scrolling
+            amountScrolled -= (mouseY - initialClickY) * scrollMultiplier;
+            initialClickY = mouseY;
+        }
+    }
+
+    protected int getScrollBarX() {
+        return maxX;
+    }
+
+    protected void drawContainerBackground(Tessellator tess) {
+        GL11.glColor4f(1.0F, 1.0F, 1.0F, 1.0F);
+        GL11.glDisable(GL11.GL_TEXTURE_2D);
+        tess.startDrawingQuads();
+        tess.setColorOpaque_I(2105376);
+        tess.addVertex(minX, maxY, 0.0D);
+        tess.addVertex(maxX, maxY, 0.0D);
+        tess.addVertex(maxX, minY, 0.0D);
+        tess.addVertex(minX, minY, 0.0D);
+        tess.draw();
+        GL11.glEnable(GL11.GL_TEXTURE_2D);
+    }
+
+    public interface IGuiScreen {
+
+        int getGuiLeft();
+
+        int getGuiTop();
+
+        int getXSize();
+
+        int getYSize();
+
+        void addButton(GuiButton button);
+
+        void removeButton(GuiButton button);
+
+        int getOverlayOffsetX();
+
+        void doActionPerformed(GuiButton but);
+    }
+
+    public interface ListSelectionListener<T> {
+
+        void selectionChanged(GuiScrollableList<T> list, int selectedIndex);
+    }
+}

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

@@ -1,5 +1,8 @@
 package com.gtnewhorizon.structurelib.item;
 
+import static net.minecraft.util.StatCollector.translateToLocal;
+
+import java.util.List;
 import net.minecraft.block.Block;
 import net.minecraft.creativetab.CreativeTabs;
 import net.minecraft.entity.player.EntityPlayer;
@@ -7,10 +10,6 @@ import net.minecraft.item.ItemBlock;
 import net.minecraft.item.ItemStack;
 import net.minecraft.util.EnumChatFormatting;
 
-import java.util.List;
-
-import static net.minecraft.util.StatCollector.translateToLocal;
-
 public class ItemBlockHint extends ItemBlock {
     public ItemBlockHint(Block p_i45328_1_) {
         super(p_i45328_1_);
@@ -22,7 +21,7 @@ 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
+        aList.add(translateToLocal("structurelib.blockhint.desc.0")); // Helps while building
         switch (aStack.getItemDamage()) {
             case 0:
             case 1:
@@ -36,21 +35,31 @@ public class ItemBlockHint extends ItemBlock {
             case 9:
             case 10:
             case 11:
-                aList.add(EnumChatFormatting.AQUA.toString() + EnumChatFormatting.BOLD + translateToLocal("structurelib.blockhint.desc.1"));//Placeholder for a certain group.
+                aList.add(EnumChatFormatting.AQUA.toString()
+                        + EnumChatFormatting.BOLD
+                        + translateToLocal("structurelib.blockhint.desc.1")); // Placeholder for a certain group.
                 break;
             case 12:
-                aList.add(EnumChatFormatting.AQUA.toString() + EnumChatFormatting.BOLD + translateToLocal("structurelib.blockhint.desc.2"));//General placeholder.
+                aList.add(EnumChatFormatting.AQUA.toString()
+                        + EnumChatFormatting.BOLD
+                        + translateToLocal("structurelib.blockhint.desc.2")); // General placeholder.
                 break;
             case 13:
-                aList.add(EnumChatFormatting.AQUA.toString() + EnumChatFormatting.BOLD + translateToLocal("structurelib.blockhint.desc.3"));//Make sure it contains Air material.
+                aList.add(EnumChatFormatting.AQUA.toString()
+                        + EnumChatFormatting.BOLD
+                        + translateToLocal("structurelib.blockhint.desc.3")); // Make sure it contains Air material.
                 break;
             case 14:
-                aList.add(EnumChatFormatting.AQUA.toString() + EnumChatFormatting.BOLD + translateToLocal("structurelib.blockhint.desc.4"));//Make sure it does not contain Air material.
+                aList.add(EnumChatFormatting.AQUA.toString()
+                        + EnumChatFormatting.BOLD
+                        + translateToLocal(
+                                "structurelib.blockhint.desc.4")); // Make sure it does not contain Air material.
                 break;
             case 15:
-                aList.add(EnumChatFormatting.BLUE.toString() + translateToLocal("structurelib.blockhint.desc.5"));//ERROR, what did u expect?
+                aList.add(EnumChatFormatting.BLUE.toString()
+                        + translateToLocal("structurelib.blockhint.desc.5")); // ERROR, what did u expect?
                 break;
-            default://WTF?
+            default: // WTF?
                 aList.add("Damn son where did you get that!?");
                 aList.add(EnumChatFormatting.BLUE.toString() + "From outer space... I guess...");
         }

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

@@ -1,17 +1,19 @@
 package com.gtnewhorizon.structurelib.item;
 
-import com.gtnewhorizon.structurelib.StructureLib;
-import com.gtnewhorizon.structurelib.alignment.constructable.ConstructableUtility;
-import net.minecraft.entity.player.EntityPlayer;
-import net.minecraft.item.Item;
-import net.minecraft.item.ItemStack;
-import net.minecraft.world.World;
-
-import java.util.List;
-
 import static com.gtnewhorizon.structurelib.StructureLibAPI.MOD_ID;
 import static net.minecraft.util.EnumChatFormatting.BLUE;
 import static net.minecraft.util.StatCollector.translateToLocal;
+import static net.minecraft.util.StatCollector.translateToLocalFormatted;
+
+import com.gtnewhorizon.structurelib.StructureLib;
+import com.gtnewhorizon.structurelib.alignment.constructable.ChannelDataAccessor;
+import com.gtnewhorizon.structurelib.alignment.constructable.ConstructableUtility;
+import java.util.List;
+import net.minecraft.entity.player.EntityPlayer;
+import net.minecraft.item.Item;
+import net.minecraft.item.ItemStack;
+import net.minecraft.world.World;
+import org.lwjgl.input.Keyboard;
 
 public class ItemConstructableTrigger extends Item {
     public ItemConstructableTrigger() {
@@ -21,17 +23,54 @@ public class ItemConstructableTrigger extends Item {
     }
 
     @Override
-    public boolean onItemUseFirst(ItemStack stack, EntityPlayer player, World world, int x, int y, int z, int side, float hitX, float hitY, float hitZ) {
+    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);
+        return super.onItemRightClick(stack, world, player);
+    }
+
+    @Override
+    public boolean onItemUseFirst(
+            ItemStack stack,
+            EntityPlayer player,
+            World world,
+            int x,
+            int y,
+            int z,
+            int side,
+            float hitX,
+            float hitY,
+            float hitZ) {
         return ConstructableUtility.handle(stack, player, world, x, y, z, side);
     }
 
     @SuppressWarnings("unchecked")
     @Override
     public void addInformation(ItemStack aStack, EntityPlayer ep, List aList, boolean boo) {
-        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 (Keyboard.isKeyDown(Keyboard.KEY_LSHIFT)) {
+            aList.add(translateToLocalFormatted(
+                    "item.structurelib.constructableTrigger.desc.lshift.0",
+                    ChannelDataAccessor.countChannelData(aStack)));
+            ChannelDataAccessor.iterateChannelData(aStack)
+                    .map(e -> e.getKey() + ": " + e.getValue())
+                    .forEach(aList::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"));
+        }
     }
 }

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

@@ -1,20 +1,19 @@
 package com.gtnewhorizon.structurelib.item;
 
+import static com.gtnewhorizon.structurelib.StructureLibAPI.MOD_ID;
+import static net.minecraft.util.StatCollector.translateToLocal;
+
 import com.gtnewhorizon.structurelib.StructureLib;
 import com.gtnewhorizon.structurelib.alignment.AlignmentUtility;
 import cpw.mods.fml.relauncher.Side;
 import cpw.mods.fml.relauncher.SideOnly;
+import java.util.List;
 import net.minecraft.entity.player.EntityPlayer;
 import net.minecraft.item.Item;
 import net.minecraft.item.ItemStack;
 import net.minecraft.util.EnumChatFormatting;
 import net.minecraft.world.World;
 
-import java.util.List;
-
-import static com.gtnewhorizon.structurelib.StructureLibAPI.MOD_ID;
-import static net.minecraft.util.StatCollector.translateToLocal;
-
 public class ItemFrontRotationTool extends Item {
     public ItemFrontRotationTool() {
         setMaxStackSize(1);
@@ -24,15 +23,27 @@ public class ItemFrontRotationTool extends Item {
     }
 
     @Override
-    public boolean onItemUseFirst(ItemStack stack, EntityPlayer player, World world, int x, int y, int z, int side, float hitX, float hitY, float hitZ) {
+    public boolean onItemUseFirst(
+            ItemStack stack,
+            EntityPlayer player,
+            World world,
+            int x,
+            int y,
+            int z,
+            int side,
+            float hitX,
+            float hitY,
+            float hitZ) {
         return AlignmentUtility.handle(player, world, x, y, z);
     }
 
     @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.
+        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.
     }
 }

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

@@ -21,8 +21,7 @@ public abstract class AlignmentMessage implements IMessage {
     int mPosD;
     int mAlign;
 
-    public AlignmentMessage() {
-    }
+    public AlignmentMessage() {}
 
     @Override
     public void fromBytes(ByteBuf pBuffer) {
@@ -47,11 +46,9 @@ public abstract class AlignmentMessage implements IMessage {
     }
 
     private AlignmentMessage(IAlignmentProvider provider) {
-        if (!(provider instanceof TileEntity))
-            throw new IllegalArgumentException("Provider must be a TileEntity");
+        if (!(provider instanceof TileEntity)) throw new IllegalArgumentException("Provider must be a TileEntity");
         IAlignment alignment = provider.getAlignment();
-        if (alignment == null)
-            throw new IllegalArgumentException("Passed in provider does not provide an alignment!");
+        if (alignment == null) throw new IllegalArgumentException("Passed in provider does not provide an alignment!");
         TileEntity base = (TileEntity) provider;
         mPosX = base.xCoord;
         mPosY = base.yCoord;
@@ -69,8 +66,7 @@ public abstract class AlignmentMessage implements IMessage {
     }
 
     public static class AlignmentQuery extends AlignmentMessage {
-        public AlignmentQuery() {
-        }
+        public AlignmentQuery() {}
 
         public AlignmentQuery(IAlignmentProvider provider) {
             super(provider);
@@ -82,8 +78,7 @@ public abstract class AlignmentMessage implements IMessage {
     }
 
     public static class AlignmentData extends AlignmentMessage {
-        public AlignmentData() {
-        }
+        public AlignmentData() {}
 
         private AlignmentData(AlignmentQuery query) {
             mPosX = query.mPosX;
@@ -106,7 +101,9 @@ public abstract class AlignmentMessage implements IMessage {
         @Override
         public IMessage onMessage(AlignmentData pMessage, MessageContext pCtx) {
             if (StructureLib.getCurrentPlayer().worldObj.provider.dimensionId == pMessage.mPosD) {
-                TileEntity te = StructureLib.getCurrentPlayer().worldObj.getTileEntity(pMessage.mPosX, pMessage.mPosY, pMessage.mPosZ);
+                TileEntity te = StructureLib.getCurrentPlayer()
+                        .worldObj
+                        .getTileEntity(pMessage.mPosX, pMessage.mPosY, pMessage.mPosZ);
                 if (te instanceof IAlignmentProvider) {
                     IAlignment alignment = ((IAlignmentProvider) te).getAlignment();
                     if (alignment != null) {
@@ -126,8 +123,7 @@ public abstract class AlignmentMessage implements IMessage {
                 TileEntity te = world.getTileEntity(pMessage.mPosX, pMessage.mPosY, pMessage.mPosZ);
                 if (te instanceof IAlignmentProvider) {
                     IAlignment alignment = ((IAlignmentProvider) te).getAlignment();
-                    if (alignment == null)
-                        return null;
+                    if (alignment == null) return null;
                     pMessage.mAlign = alignment.getExtendedFacing().getIndex();
                     return new AlignmentData(pMessage);
                 }
@@ -135,4 +131,4 @@ public abstract class AlignmentMessage implements IMessage {
             return null;
         }
     }
-}
+}

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

@@ -0,0 +1,67 @@
+package com.gtnewhorizon.structurelib.net;
+
+import com.gtnewhorizon.structurelib.StructureLib;
+import com.gtnewhorizon.structurelib.alignment.constructable.ChannelDataAccessor;
+import com.gtnewhorizon.structurelib.item.ItemConstructableTrigger;
+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;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+import java.util.Map.Entry;
+import net.minecraft.entity.player.EntityPlayerMP;
+import net.minecraft.item.ItemStack;
+import org.apache.commons.lang3.tuple.Pair;
+
+public class SetChannelDataMessage implements IMessage {
+    private List<Map.Entry<String, Integer>> data = new ArrayList<>();
+
+    public SetChannelDataMessage() {}
+
+    public SetChannelDataMessage(ItemStack trigger) {
+        ChannelDataAccessor.iterateChannelData(trigger).forEach(data::add);
+    }
+
+    @Override
+    public void fromBytes(ByteBuf buf) {
+        data.clear();
+        int size = ByteBufUtils.readVarShort(buf);
+        for (int i = 0; i < size; i++) {
+            data.add(Pair.of(ByteBufUtils.readUTF8String(buf), ByteBufUtils.readVarInt(buf, 4)));
+        }
+    }
+
+    @Override
+    public void toBytes(ByteBuf buf) {
+        ByteBufUtils.writeVarShort(buf, data.size());
+        for (Entry<String, Integer> e : data) {
+            ByteBufUtils.writeUTF8String(buf, e.getKey());
+            ByteBufUtils.writeVarInt(buf, e.getValue(), 4);
+        }
+    }
+
+    public static class Handler implements IMessageHandler<SetChannelDataMessage, 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);
+                for (Entry<String, Integer> e : message.data) {
+                    ChannelDataAccessor.setChannelData(heldItem, 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
+            } else {
+                StructureLib.LOGGER.warn(
+                        "{} trying to set channel data on {}, which is not a hologram projector!",
+                        player.getUniqueID(),
+                        heldItem);
+            }
+            return null;
+        }
+    }
+}

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

@@ -0,0 +1,77 @@
+package com.gtnewhorizon.structurelib.net;
+
+import static com.gtnewhorizon.structurelib.StructureLib.LOGGER;
+
+import com.gtnewhorizon.structurelib.StructureLib;
+import com.gtnewhorizon.structurelib.StructureLibAPI;
+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 UpdateHintParticleMessage implements IMessage {
+    private int x;
+    private short y;
+    private int z;
+    private short r;
+    private short g;
+    private short b;
+    private short a;
+
+    public UpdateHintParticleMessage() {}
+
+    public UpdateHintParticleMessage(int x, short y, int z, short r, short g, short b, short a) {
+        this.x = x;
+        this.y = y;
+        this.z = z;
+        this.r = r;
+        this.g = g;
+        this.b = b;
+        this.a = a;
+    }
+
+    @Override
+    public void fromBytes(ByteBuf buf) {
+        x = buf.readInt();
+        y = buf.readShort();
+        z = buf.readInt();
+        r = buf.readUnsignedByte();
+        g = buf.readUnsignedByte();
+        b = buf.readUnsignedByte();
+        a = buf.readUnsignedByte();
+    }
+
+    @Override
+    public void toBytes(ByteBuf buf) {
+        buf.writeInt(x);
+        buf.writeShort(y);
+        buf.writeInt(z);
+        buf.writeByte(r);
+        buf.writeByte(g);
+        buf.writeByte(b);
+        buf.writeByte(a);
+    }
+
+    public static class Handler implements IMessageHandler<UpdateHintParticleMessage, IMessage> {
+        @Override
+        public IMessage onMessage(UpdateHintParticleMessage msg, MessageContext ctx) {
+            boolean updateResult = StructureLibAPI.updateHintParticleTint(
+                    StructureLib.getCurrentPlayer(),
+                    StructureLib.getCurrentPlayer().worldObj,
+                    msg.x,
+                    msg.y,
+                    msg.z,
+                    new short[] {
+                        msg.r, msg.g, msg.b, msg.a,
+                    });
+            if (StructureLib.DEBUG_MODE)
+                LOGGER.debug(
+                        "Server instructed to update hint particle at ({}, {}, {}), result {}!",
+                        msg.x,
+                        msg.y,
+                        msg.z,
+                        updateResult);
+            return null;
+        }
+    }
+}

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

@@ -1,41 +0,0 @@
-package com.gtnewhorizon.structurelib.proxy;
-
-import cpw.mods.fml.common.event.FMLPreInitializationEvent;
-import net.minecraft.block.Block;
-import net.minecraft.entity.player.EntityPlayer;
-import net.minecraft.util.IIcon;
-import net.minecraft.world.World;
-
-public class CommonProxy {
-    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) {
-    }
-
-    public void hintParticle(World w, int x, int y, int z, IIcon[] icons) {
-    }
-
-    public void hintParticle(World w, int x, int y, int z, Block block, int meta) {
-    }
-
-    public EntityPlayer getCurrentPlayer() {
-        return null;
-    }
-
-    public boolean isCurrentPlayer(EntityPlayer player) {
-        return false;
-    }
-
-    public void addClientSideChatMessages(String... messages) {
-    }
-
-    public void startHinting(World w) {
-    }
-
-    public void endHinting(World w) {
-    }
-
-    public void preInit(FMLPreInitializationEvent e) {
-    }
-}

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

@@ -0,0 +1,77 @@
+package com.gtnewhorizon.structurelib.structure;
+
+import com.gtnewhorizon.structurelib.util.InventoryIterable;
+import com.gtnewhorizon.structurelib.util.InventoryUtility;
+import com.gtnewhorizon.structurelib.util.ItemStackPredicate;
+import com.gtnewhorizon.structurelib.util.ItemStackPredicate.NBTMode;
+import java.util.Map;
+import java.util.function.Predicate;
+import javax.annotation.Nonnull;
+import net.minecraft.entity.player.EntityPlayerMP;
+import net.minecraft.inventory.IInventory;
+import net.minecraft.item.ItemStack;
+
+public interface IItemSource {
+    /**
+     * We are probably not going to need to get a lot of items from this method
+     * so I don't care about the overhead of storing all fetched items even if downstream code doesn't need it
+     */
+    @Nonnull
+    Map<ItemStack, Integer> take(Predicate<ItemStack> predicate, boolean simulate, int count);
+
+    default ItemStack takeOne(Predicate<ItemStack> predicate, boolean simulate) {
+        Map<ItemStack, Integer> take = take(predicate, simulate, 1);
+        return take.isEmpty() ? null : take.keySet().iterator().next();
+    }
+
+    default boolean takeAll(Predicate<ItemStack> predicate, boolean simulate, int count) {
+        // fast path for 1 item take requests
+        if (count == 1) return takeOne(predicate, simulate) != null;
+        Map<ItemStack, Integer> have = take(predicate, true, count);
+        if (have.values().stream().mapToInt(Integer::intValue).sum() < count) return false;
+        take(predicate, simulate, count);
+        return true;
+    }
+
+    default boolean takeOne(ItemStack stack, boolean simulate) {
+        if (stack == null || stack.getItem() == null || stack.stackSize != 1) throw new IllegalArgumentException();
+        ItemStack took = takeOne(ItemStackPredicate.from(stack, NBTMode.EXACT), simulate);
+        return took == null || took.stackSize <= 0;
+    }
+
+    default boolean takeAll(ItemStack stack, boolean simulate) {
+        // fast path for 1 item take requests
+        if (stack.stackSize == 1) return takeOne(stack, simulate);
+        ItemStackPredicate predicate = ItemStackPredicate.from(stack, NBTMode.EXACT);
+        Map<ItemStack, Integer> have = take(predicate, true, stack.stackSize);
+        if (have.values().stream().mapToInt(Integer::intValue).sum() < stack.stackSize) return false;
+        take(predicate, simulate, stack.stackSize);
+        return true;
+    }
+
+    static IItemSource fromPlayer(EntityPlayerMP player) {
+        return new IItemSource() {
+            @Nonnull
+            @Override
+            public Map<ItemStack, Integer> take(Predicate<ItemStack> p, boolean s, int c) {
+                return InventoryUtility.takeFromInventory(player, p, s, c);
+            }
+
+            @Override
+            public boolean takeOne(ItemStack stack, boolean simulate) {
+                if (stack == null || stack.getItem() == null || stack.stackSize != 1)
+                    throw new IllegalArgumentException();
+                return InventoryUtility.takeFromInventory(player, stack, simulate) == 1;
+            }
+
+            @Override
+            public boolean takeAll(ItemStack stack, boolean simulate) {
+                return InventoryUtility.takeFromInventory(player, stack, simulate) == stack.stackSize;
+            }
+        };
+    }
+
+    static IItemSource fromInventory(IInventory inv) {
+        return (p, s, c) -> InventoryUtility.takeFromInventory(new InventoryIterable<>(inv), p, s, c, true);
+    }
+}

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

@@ -0,0 +1,7 @@
+package com.gtnewhorizon.structurelib.structure;
+
+import net.minecraft.block.Block;
+
+public interface ISpecialItemBlock {
+    int getItemMetaFromBlockMeta(Block block, int blockMeta);
+}

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

@@ -1,14 +1,15 @@
 package com.gtnewhorizon.structurelib.structure;
 
+import static com.gtnewhorizon.structurelib.StructureLib.DEBUG_MODE;
+import static com.gtnewhorizon.structurelib.structure.IStructureWalker.ignoreBlockUnloaded;
+import static com.gtnewhorizon.structurelib.structure.IStructureWalker.skipBlockUnloaded;
+
 import com.gtnewhorizon.structurelib.StructureLib;
 import com.gtnewhorizon.structurelib.alignment.enumerable.ExtendedFacing;
+import net.minecraft.entity.player.EntityPlayerMP;
 import net.minecraft.item.ItemStack;
 import net.minecraft.world.World;
 
-import java.util.Arrays;
-
-import static com.gtnewhorizon.structurelib.StructureLib.DEBUG_MODE;
-
 public interface IStructureDefinition<T> {
     /**
      * Used internally
@@ -21,152 +22,248 @@ public interface IStructureDefinition<T> {
      */
     IStructureElement<T>[] getStructureFor(String name);
 
-    default boolean check(T object, String piece, World world, ExtendedFacing extendedFacing,
-                          int basePositionX, int basePositionY, int basePositionZ,
-                          int basePositionA, int basePositionB, int basePositionC,
-                          boolean forceCheckAllBlocks) {
-        return iterate(object, null, getStructureFor(piece), world, extendedFacing, basePositionX, basePositionY, basePositionZ,
-            basePositionA, basePositionB, basePositionC, false, forceCheckAllBlocks);
+    default boolean check(
+            T object,
+            String piece,
+            World world,
+            ExtendedFacing extendedFacing,
+            int basePositionX,
+            int basePositionY,
+            int basePositionZ,
+            int basePositionA,
+            int basePositionB,
+            int basePositionC,
+            boolean forceCheckAllBlocks) {
+        return iterate(
+                object,
+                null,
+                getStructureFor(piece),
+                world,
+                extendedFacing,
+                basePositionX,
+                basePositionY,
+                basePositionZ,
+                basePositionA,
+                basePositionB,
+                basePositionC,
+                false,
+                forceCheckAllBlocks);
     }
 
-    default boolean hints(T object, ItemStack trigger, String piece, World world, ExtendedFacing extendedFacing,
-                          int basePositionX, int basePositionY, int basePositionZ,
-                          int basePositionA, int basePositionB, int basePositionC) {
-        return iterate(object, trigger, getStructureFor(piece), world, extendedFacing, basePositionX, basePositionY, basePositionZ,
-            basePositionA, basePositionB, basePositionC, true, null);
+    default boolean hints(
+            T object,
+            ItemStack trigger,
+            String piece,
+            World world,
+            ExtendedFacing extendedFacing,
+            int basePositionX,
+            int basePositionY,
+            int basePositionZ,
+            int basePositionA,
+            int basePositionB,
+            int basePositionC) {
+        return iterate(
+                object,
+                trigger,
+                getStructureFor(piece),
+                world,
+                extendedFacing,
+                basePositionX,
+                basePositionY,
+                basePositionZ,
+                basePositionA,
+                basePositionB,
+                basePositionC,
+                true,
+                null);
     }
 
-    default boolean build(T object, ItemStack trigger, String piece, World world, ExtendedFacing extendedFacing,
-                          int basePositionX, int basePositionY, int basePositionZ,
-                          int basePositionA, int basePositionB, int basePositionC) {
-        return iterate(object, trigger, getStructureFor(piece), world, extendedFacing, basePositionX, basePositionY, basePositionZ,
-            basePositionA, basePositionB, basePositionC, false, null);
+    default boolean build(
+            T object,
+            ItemStack trigger,
+            String piece,
+            World world,
+            ExtendedFacing extendedFacing,
+            int basePositionX,
+            int basePositionY,
+            int basePositionZ,
+            int basePositionA,
+            int basePositionB,
+            int basePositionC) {
+        return iterate(
+                object,
+                trigger,
+                getStructureFor(piece),
+                world,
+                extendedFacing,
+                basePositionX,
+                basePositionY,
+                basePositionZ,
+                basePositionA,
+                basePositionB,
+                basePositionC,
+                false,
+                null);
     }
 
-    default boolean buildOrHints(T object, ItemStack trigger, String piece, World world, ExtendedFacing extendedFacing,
-                                 int basePositionX, int basePositionY, int basePositionZ,
-                                 int basePositionA, int basePositionB, int basePositionC,
-                                 boolean hintsOnly) {
-        return iterate(object, trigger, getStructureFor(piece), world, extendedFacing, basePositionX, basePositionY, basePositionZ,
-            basePositionA, basePositionB, basePositionC, hintsOnly, null);
+    default boolean buildOrHints(
+            T object,
+            ItemStack trigger,
+            String piece,
+            World world,
+            ExtendedFacing extendedFacing,
+            int basePositionX,
+            int basePositionY,
+            int basePositionZ,
+            int basePositionA,
+            int basePositionB,
+            int basePositionC,
+            boolean hintsOnly) {
+        return iterate(
+                object,
+                trigger,
+                getStructureFor(piece),
+                world,
+                extendedFacing,
+                basePositionX,
+                basePositionY,
+                basePositionZ,
+                basePositionA,
+                basePositionB,
+                basePositionC,
+                hintsOnly,
+                null);
     }
 
-    static <T> boolean iterate(T object, ItemStack trigger, IStructureElement<T>[] elements, World world, ExtendedFacing extendedFacing,
-                               int basePositionX, int basePositionY, int basePositionZ,
-                               int basePositionA, int basePositionB, int basePositionC,
-                               boolean hintsOnly, Boolean checkBlocksIfNotNullForceCheckAllIfTrue) {
+    /**
+     * @param elementBudget build up to this many elements
+     * @param source        from where to drain resource
+     * @param actor         source of action
+     * @param check         whether {@link IStructureElement#check(Object, World, int, int, int)} should be called if anything
+     *                      would be placed. use with caution.
+     *                      if in doubt, call {@link #check(Object, String, World, ExtendedFacing, int, int, int, int, int, int, boolean)}
+     *                      after this call and set this parameter to false
+     * @return number of elements built, or -1 if structure done
+     * @see #build(Object, ItemStack, String, World, ExtendedFacing, int, int, int, int, int, int)
+     */
+    default int survivalBuild(
+            T object,
+            ItemStack trigger,
+            String piece,
+            World world,
+            ExtendedFacing extendedFacing,
+            int basePositionX,
+            int basePositionY,
+            int basePositionZ,
+            int basePositionA,
+            int basePositionB,
+            int basePositionC,
+            int elementBudget,
+            IItemSource source,
+            EntityPlayerMP actor,
+            boolean check) {
+        SurvivalBuildStructureWalker<T> walker =
+                new SurvivalBuildStructureWalker<>(object, trigger, source, actor, elementBudget, check);
+        StructureUtility.iterateV2(
+                getStructureFor(piece),
+                world,
+                extendedFacing,
+                basePositionX,
+                basePositionY,
+                basePositionZ,
+                basePositionA,
+                basePositionB,
+                basePositionC,
+                walker,
+                "survivalBuild");
+        return walker.getBuilt();
+    }
+
+    static <T> boolean iterate(
+            T object,
+            ItemStack trigger,
+            IStructureElement<T>[] elements,
+            World world,
+            ExtendedFacing extendedFacing,
+            int basePositionX,
+            int basePositionY,
+            int basePositionZ,
+            int basePositionA,
+            int basePositionB,
+            int basePositionC,
+            boolean hintsOnly,
+            Boolean checkBlocksIfNotNullForceCheckAllIfTrue) {
         if (world.isRemote ^ hintsOnly) {
             return false;
         }
 
-        //change base position to base offset
-        basePositionA = -basePositionA;
-        basePositionB = -basePositionB;
-        basePositionC = -basePositionC;
-
-        int[] abc = new int[]{basePositionA, basePositionB, basePositionC};
-        int[] xyz = new int[3];
-
         if (checkBlocksIfNotNullForceCheckAllIfTrue != null) {
+            boolean success;
             if (checkBlocksIfNotNullForceCheckAllIfTrue) {
-                for (IStructureElement<T> element : elements) {
-                    if (element.isNavigating()) {
-                        abc[0] = (element.resetA() ? basePositionA : abc[0]) + element.getStepA();
-                        abc[1] = (element.resetB() ? basePositionB : abc[1]) + element.getStepB();
-                        abc[2] = (element.resetC() ? basePositionC : abc[2]) + element.getStepC();
-                    } else {
-                        extendedFacing.getWorldOffset(abc, xyz);
-                        xyz[0] += basePositionX;
-                        xyz[1] += basePositionY;
-                        xyz[2] += basePositionZ;
-
-                        if (world.blockExists(xyz[0], xyz[1], xyz[2])) {
-                            if (!element.check(object, world, xyz[0], xyz[1], xyz[2])) {
-                                if (DEBUG_MODE) {
-                                    StructureLib.LOGGER.info("Multi [" + basePositionX + ", " + basePositionY + ", " + basePositionZ + "] failed @ " +
-                                        Arrays.toString(xyz) + " " + Arrays.toString(abc));
-                                }
-                                return false;
-                            }
-                        } else {
-                            if (DEBUG_MODE) {
-                                StructureLib.LOGGER.info("Multi [" + basePositionX + ", " + basePositionY + ", " + basePositionZ + "] !blockExists @ " +
-                                    Arrays.toString(xyz) + " " + Arrays.toString(abc));
-                            }
-                            return false;
-                        }
-                        abc[0] += 1;
-                    }
-                }
+                success = StructureUtility.iterateV2(
+                        elements,
+                        world,
+                        extendedFacing,
+                        basePositionX,
+                        basePositionY,
+                        basePositionZ,
+                        basePositionA,
+                        basePositionB,
+                        basePositionC,
+                        (e, w, x, y, z) -> e.check(object, w, x, y, z),
+                        "check");
             } else {
-                for (IStructureElement<T> element : elements) {
-                    if (element.isNavigating()) {
-                        abc[0] = (element.resetA() ? basePositionA : abc[0]) + element.getStepA();
-                        abc[1] = (element.resetB() ? basePositionB : abc[1]) + element.getStepB();
-                        abc[2] = (element.resetC() ? basePositionC : abc[2]) + element.getStepC();
-                    } else {
-                        extendedFacing.getWorldOffset(abc, xyz);
-                        xyz[0] += basePositionX;
-                        xyz[1] += basePositionY;
-                        xyz[2] += basePositionZ;
-
-                        if (world.blockExists(xyz[0], xyz[1], xyz[2])) {
-                            if (!element.check(object, world, xyz[0], xyz[1], xyz[2])) {
-                                if (DEBUG_MODE) {
-                                    StructureLib.LOGGER.info("Multi [" + basePositionX + ", " + basePositionY + ", " + basePositionZ + "] failed @ " +
-                                        Arrays.toString(xyz) + " " + Arrays.toString(abc));
-                                }
-                                return false;
-                            }
-                        } else {
-                            if (DEBUG_MODE) {
-                                StructureLib.LOGGER.info("Multi [" + basePositionX + ", " + basePositionY + ", " + basePositionZ + "] !blockExists @ " +
-                                    Arrays.toString(xyz) + " " + Arrays.toString(abc));
-                            }
-                        }
-                        abc[0] += 1;
-                    }
-                }
+                success = StructureUtility.iterateV2(
+                        elements,
+                        world,
+                        extendedFacing,
+                        basePositionX,
+                        basePositionY,
+                        basePositionZ,
+                        basePositionA,
+                        basePositionB,
+                        basePositionC,
+                        skipBlockUnloaded((e, w, x, y, z) -> e.check(object, w, x, y, z)),
+                        "check force");
             }
-            if (DEBUG_MODE) {
-                StructureLib.LOGGER.info("Multi [" + basePositionX + ", " + basePositionY + ", " + basePositionZ + "] pass");
+            if (DEBUG_MODE && success) {
+                StructureLib.LOGGER.info(
+                        "Multi [" + basePositionX + ", " + basePositionY + ", " + basePositionZ + "] pass");
             }
+            return success;
         } else {
             if (hintsOnly) {
-                for (IStructureElement<T> element : elements) {
-                    if (element.isNavigating()) {
-                        abc[0] = (element.resetA() ? basePositionA : abc[0]) + element.getStepA();
-                        abc[1] = (element.resetB() ? basePositionB : abc[1]) + element.getStepB();
-                        abc[2] = (element.resetC() ? basePositionC : abc[2]) + element.getStepC();
-                    } else {
-                        extendedFacing.getWorldOffset(abc, xyz);
-                        xyz[0] += basePositionX;
-                        xyz[1] += basePositionY;
-                        xyz[2] += basePositionZ;
-
-                        element.spawnHint(object, world, xyz[0], xyz[1], xyz[2], trigger);
-
-                        abc[0] += 1;
-                    }
-                }
+                StructureUtility.iterateV2(
+                        elements,
+                        world,
+                        extendedFacing,
+                        basePositionX,
+                        basePositionY,
+                        basePositionZ,
+                        basePositionA,
+                        basePositionB,
+                        basePositionC,
+                        ignoreBlockUnloaded((e, w, x, y, z) -> {
+                            e.spawnHint(object, world, x, y, z, trigger);
+                            return true;
+                        }),
+                        "spawnHint");
             } else {
-                for (IStructureElement<T> element : elements) {
-                    if (element.isNavigating()) {
-                        abc[0] = (element.resetA() ? basePositionA : abc[0]) + element.getStepA();
-                        abc[1] = (element.resetB() ? basePositionB : abc[1]) + element.getStepB();
-                        abc[2] = (element.resetC() ? basePositionC : abc[2]) + element.getStepC();
-                    } else {
-                        extendedFacing.getWorldOffset(abc, xyz);
-                        xyz[0] += basePositionX;
-                        xyz[1] += basePositionY;
-                        xyz[2] += basePositionZ;
-
-                        if (world.blockExists(xyz[0], xyz[1], xyz[2])) {
-                            element.placeBlock(object, world, xyz[0], xyz[1], xyz[2], trigger);
-                        }
-                        abc[0] += 1;
-                    }
-                }
+                StructureUtility.iterateV2(
+                        elements,
+                        world,
+                        extendedFacing,
+                        basePositionX,
+                        basePositionY,
+                        basePositionZ,
+                        basePositionA,
+                        basePositionB,
+                        basePositionC,
+                        ignoreBlockUnloaded((e, w, x, y, z) -> {
+                            e.placeBlock(object, world, x, y, z, trigger);
+                            return true;
+                        }),
+                        "placeBlock");
             }
         }
         return true;

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

@@ -1,6 +1,14 @@
 package com.gtnewhorizon.structurelib.structure;
 
+import static com.gtnewhorizon.structurelib.StructureLib.DEBUG_MODE;
+import static com.gtnewhorizon.structurelib.StructureLib.LOGGER;
+import static com.gtnewhorizon.structurelib.StructureLib.PANIC_MODE;
+
+import com.gtnewhorizon.structurelib.StructureLibAPI;
+import java.util.function.Consumer;
+import net.minecraft.entity.player.EntityPlayerMP;
 import net.minecraft.item.ItemStack;
+import net.minecraft.util.IChatComponent;
 import net.minecraft.world.World;
 
 /**
@@ -13,6 +21,50 @@ public interface IStructureElement<T> {
 
     boolean placeBlock(T t, World world, int x, int y, int z, ItemStack trigger);
 
+    /**
+     * Try place the block by taking resource from given IItemSource.
+     *
+     * @param s       drain resources from this place
+     * @param actor   source of action.
+     * @param chatter
+     */
+    default PlaceResult survivalPlaceBlock(
+            T t,
+            World world,
+            int x,
+            int y,
+            int z,
+            ItemStack trigger,
+            IItemSource s,
+            EntityPlayerMP actor,
+            Consumer<IChatComponent> chatter) {
+        if (PANIC_MODE) throw new RuntimeException("Panic Tripwire hit");
+        if (DEBUG_MODE)
+            LOGGER.error(
+                    "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;
+    }
+
+    /**
+     * Forget the messed up class dependency graph for now. this is just so convenient.
+     */
+    default IStructureElementNoPlacement<T> noPlacement() {
+        return new IStructureElementNoPlacement<T>() {
+
+            @Override
+            public boolean check(T t, World world, int x, int y, int z) {
+                return IStructureElement.this.check(t, world, x, y, z);
+            }
+
+            @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);
+            }
+        };
+    }
+
     default int getStepA() {
         return 1;
     }
@@ -40,4 +92,31 @@ public interface IStructureElement<T> {
     default boolean isNavigating() {
         return false;
     }
+
+    enum PlaceResult {
+        /**
+         * This element either exists already, or does not yet have an implementation for survivalPlaceBlock, or
+         * some other unforeseen situations.
+         */
+        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.
+         */
+        REJECT,
+        /**
+         * Autoplace cannot proceed within this tick. To proceed further would require stopping the placement and wait for next round.
+         */
+        STOP,
+        /**
+         * Element placed successfully.
+         */
+        ACCEPT,
+        /**
+         * Combination of ACCEPT and STOP.
+         *
+         * Element placed successfully. To proceed further would require stopping the placement and wait for next round.
+         */
+        ACCEPT_STOP;
+    }
 }

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

@@ -1,6 +1,11 @@
 package com.gtnewhorizon.structurelib.structure;
 
+import java.util.ArrayList;
+import java.util.List;
+import java.util.function.Consumer;
+import net.minecraft.entity.player.EntityPlayerMP;
 import net.minecraft.item.ItemStack;
+import net.minecraft.util.IChatComponent;
 import net.minecraft.world.World;
 
 /**
@@ -38,4 +43,35 @@ public interface IStructureElementChain<T> extends IStructureElement<T> {
         }
         return false;
     }
+
+    @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;
+        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:
+                    break;
+                case SKIP:
+                    haveSkip = true;
+                    break;
+                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;
+    }
 }

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

@@ -1,6 +1,9 @@
 package com.gtnewhorizon.structurelib.structure;
 
+import java.util.function.Consumer;
+import net.minecraft.entity.player.EntityPlayerMP;
 import net.minecraft.item.ItemStack;
+import net.minecraft.util.IChatComponent;
 import net.minecraft.world.World;
 
 public interface IStructureElementCheckOnly<T> extends IStructureElement<T> {
@@ -13,4 +16,18 @@ public interface IStructureElementCheckOnly<T> extends IStructureElement<T> {
     default boolean spawnHint(T t, World world, int x, int y, int z, ItemStack trigger) {
         return false;
     }
+
+    @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;
+    }
 }

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

@@ -3,5 +3,4 @@ package com.gtnewhorizon.structurelib.structure;
 /**
  * Use StructureUtility to instantiate
  */
-public interface IStructureElementDeferred<T> extends IStructureElement<T> {
-}
+public interface IStructureElementDeferred<T> extends IStructureElement<T> {}

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

@@ -1,6 +1,9 @@
 package com.gtnewhorizon.structurelib.structure;
 
+import java.util.function.Consumer;
+import net.minecraft.entity.player.EntityPlayerMP;
 import net.minecraft.item.ItemStack;
+import net.minecraft.util.IChatComponent;
 import net.minecraft.world.World;
 
 public interface IStructureElementNoPlacement<T> extends IStructureElement<T> {
@@ -8,4 +11,23 @@ public interface IStructureElementNoPlacement<T> extends IStructureElement<T> {
     default boolean placeBlock(T t, World world, int x, int y, int z, ItemStack trigger) {
         return false;
     }
+
+    @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.REJECT;
+    }
+
+    @Override
+    default IStructureElementNoPlacement<T> noPlacement() {
+        return this;
+    }
 }

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

@@ -1,6 +1,9 @@
 package com.gtnewhorizon.structurelib.structure;
 
+import java.util.function.Consumer;
+import net.minecraft.entity.player.EntityPlayerMP;
 import net.minecraft.item.ItemStack;
+import net.minecraft.util.IChatComponent;
 import net.minecraft.world.World;
 
 /**
@@ -22,6 +25,20 @@ interface IStructureNavigate<T> extends IStructureElement<T> {
         return true;
     }
 
+    @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;
+    }
+
     default boolean isNavigating() {
         return true;
     }

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

@@ -0,0 +1,39 @@
+package com.gtnewhorizon.structurelib.structure;
+
+import net.minecraft.world.World;
+
+public interface IStructureWalker<T> {
+    boolean visit(IStructureElement<T> element, World world, int x, int y, int z);
+
+    default boolean blockNotLoaded(IStructureElement<T> element, World world, int x, int y, int z) {
+        return false;
+    }
+
+    static <T> IStructureWalker<T> ignoreBlockUnloaded(IStructureWalker<T> walker) {
+        return new IStructureWalker<T>() {
+            @Override
+            public boolean visit(IStructureElement<T> element, World world, int x, int y, int z) {
+                return walker.visit(element, world, x, y, z);
+            }
+
+            @Override
+            public boolean blockNotLoaded(IStructureElement<T> element, World world, int x, int y, int z) {
+                return walker.visit(element, world, x, y, z);
+            }
+        };
+    }
+
+    static <T> IStructureWalker<T> skipBlockUnloaded(IStructureWalker<T> walker) {
+        return new IStructureWalker<T>() {
+            @Override
+            public boolean visit(IStructureElement<T> element, World world, int x, int y, int z) {
+                return walker.visit(element, world, x, y, z);
+            }
+
+            @Override
+            public boolean blockNotLoaded(IStructureElement<T> element, World world, int x, int y, int z) {
+                return true;
+            }
+        };
+    }
+}

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

@@ -1,9 +1,11 @@
 package com.gtnewhorizon.structurelib.structure;
 
-import net.minecraft.item.ItemStack;
-import net.minecraft.world.World;
-
+import java.util.function.Consumer;
 import java.util.function.Function;
+import net.minecraft.entity.player.EntityPlayerMP;
+import net.minecraft.item.ItemStack;
+import net.minecraft.util.IChatComponent;
+import net.minecraft.world.World;
 
 class LazyStructureElement<T> implements IStructureElementDeferred<T> {
     private Function<T, IStructureElement<T>> to;
@@ -35,4 +37,18 @@ class LazyStructureElement<T> implements IStructureElementDeferred<T> {
     public boolean spawnHint(T t, World world, int x, int y, int z, ItemStack trigger) {
         return get(t).spawnHint(t, world, x, y, z, trigger);
     }
+
+    @Override
+    public PlaceResult survivalPlaceBlock(
+            T t,
+            World world,
+            int x,
+            int y,
+            int z,
+            ItemStack trigger,
+            IItemSource s,
+            EntityPlayerMP actor,
+            Consumer<IChatComponent> chatter) {
+        return get(t).survivalPlaceBlock(t, world, x, y, z, trigger, s, actor, chatter);
+    }
 }

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

@@ -1,13 +1,12 @@
 package com.gtnewhorizon.structurelib.structure;
 
-import com.gtnewhorizon.structurelib.util.Vec3Impl;
-
-import java.util.*;
-import java.util.stream.Collectors;
-
 import static com.gtnewhorizon.structurelib.StructureLib.DEBUG_MODE;
 import static com.gtnewhorizon.structurelib.structure.StructureUtility.*;
 
+import com.gtnewhorizon.structurelib.util.Vec3Impl;
+import java.util.*;
+import java.util.stream.Collectors;
+
 public class StructureDefinition<T> implements IStructureDefinition<T> {
     private final Map<Character, IStructureElement<T>> elements;
     private final Map<String, String> shapes;
@@ -18,9 +17,9 @@ public class StructureDefinition<T> implements IStructureDefinition<T> {
     }
 
     private StructureDefinition(
-        Map<Character, IStructureElement<T>> elements,
-        Map<String, String> shapes,
-        Map<String, IStructureElement<T>[]> structures) {
+            Map<Character, IStructureElement<T>> elements,
+            Map<String, String> shapes,
+            Map<String, IStructureElement<T>[]> structures) {
         this.elements = elements;
         this.shapes = shapes;
         this.structures = structures;
@@ -142,17 +141,15 @@ public class StructureDefinition<T> implements IStructureDefinition<T> {
         private Map<String, IStructureElement<T>[]> compileElementSetMap() {
             Set<Integer> missing = findMissing();
             if (missing.isEmpty()) {
-                return shapes.entrySet().stream()
-                    .collect(Collectors.toMap(Map.Entry::getKey,
-                        e -> e.getValue().chars()
-                            .mapToObj(c -> (char) c)
-                            .distinct()
-                            .map(elements::get)
-                            .toArray(IStructureElement[]::new)
-                    ));
+                return shapes.entrySet().stream().collect(Collectors.toMap(Map.Entry::getKey, e -> e.getValue()
+                        .chars()
+                        .mapToObj(c -> (char) c)
+                        .distinct()
+                        .map(elements::get)
+                        .toArray(IStructureElement[]::new)));
             } else {
-                throw new RuntimeException("Missing Structure Element bindings for (chars as integers): " +
-                    Arrays.toString(missing.toArray()));
+                throw new RuntimeException("Missing Structure Element bindings for (chars as integers): "
+                        + Arrays.toString(missing.toArray()));
             }
         }
 
@@ -160,22 +157,22 @@ public class StructureDefinition<T> implements IStructureDefinition<T> {
         private Map<String, IStructureElement<T>[]> compileStructureMap() {
             Set<Integer> missing = findMissing();
             if (missing.isEmpty()) {
-                return shapes.entrySet().stream()
-                    .collect(Collectors.toMap(Map.Entry::getKey,
-                        e -> e.getValue().chars().mapToObj(c -> elements.get((char) c)).toArray(IStructureElement[]::new)
-                    ));
+                return shapes.entrySet().stream().collect(Collectors.toMap(Map.Entry::getKey, e -> e.getValue()
+                        .chars()
+                        .mapToObj(c -> elements.get((char) c))
+                        .toArray(IStructureElement[]::new)));
             } else {
-                throw new RuntimeException("Missing Structure Element bindings for (chars as integers): " +
-                    Arrays.toString(missing.toArray()));
+                throw new RuntimeException("Missing Structure Element bindings for (chars as integers): "
+                        + Arrays.toString(missing.toArray()));
             }
         }
 
         private Set<Integer> findMissing() {
             return shapes.values().stream()
-                .flatMapToInt(CharSequence::chars)
-                .filter(i -> !elements.containsKey((char) i))
-                .boxed()
-                .collect(Collectors.toSet());
+                    .flatMapToInt(CharSequence::chars)
+                    .filter(i -> !elements.containsKey((char) i))
+                    .boxed()
+                    .collect(Collectors.toSet());
         }
     }
 
@@ -194,8 +191,7 @@ public class StructureDefinition<T> implements IStructureDefinition<T> {
     @Override
     public IStructureElement<T>[] getStructureFor(String name) {
         IStructureElement<T>[] elements = structures.get(name);
-        if (elements == null)
-            throw new NoSuchElementException(name);
+        if (elements == null) throw new NoSuchElementException(name);
         return elements;
     }
 }

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

@@ -0,0 +1,56 @@
+package com.gtnewhorizon.structurelib.structure;
+
+import com.gtnewhorizon.structurelib.StructureLibAPI;
+import com.gtnewhorizon.structurelib.structure.IStructureElement.PlaceResult;
+import net.minecraft.entity.player.EntityPlayerMP;
+import net.minecraft.item.ItemStack;
+import net.minecraft.world.World;
+
+class SurvivalBuildStructureWalker<T> implements IStructureWalker<T> {
+    private final T object;
+    private final ItemStack trigger;
+    private final IItemSource source;
+    private final EntityPlayerMP actor;
+    private final int elementBudget;
+    private final boolean check;
+    private int built = -1;
+
+    public SurvivalBuildStructureWalker(
+            T object, ItemStack trigger, IItemSource source, EntityPlayerMP actor, int elementBudget, boolean check) {
+        this.object = object;
+        this.trigger = trigger;
+        this.source = source;
+        this.actor = actor;
+        this.elementBudget = elementBudget;
+        this.check = check;
+    }
+
+    @Override
+    public boolean visit(IStructureElement<T> element, World world, int x, int y, int z) {
+        PlaceResult placeResult = element.survivalPlaceBlock(
+                object, world, x, y, z, trigger, source, actor, actor::addChatComponentMessage);
+        if (placeResult != PlaceResult.SKIP && built == -1) built = 0;
+        switch (placeResult) {
+            case SKIP:
+                return true;
+            case ACCEPT:
+                if (check) element.check(object, world, x, y, z);
+                return ++built < elementBudget;
+            case REJECT:
+                StructureLibAPI.updateHintParticleTint(actor, world, x, y, z, new short[] {255, 128, 128, 0});
+                return false;
+            case ACCEPT_STOP:
+                if (check) element.check(object, world, x, y, z);
+                built += 1;
+                // intentional fallthrough
+            case STOP:
+                return false;
+            default:
+                throw new NullPointerException();
+        }
+    }
+
+    public int getBuilt() {
+        return built;
+    }
+}

src/main/java/com/gtnewhorizon/structurelib/structure/adders/IBlockAdder.java

@@ -1,6 +1,5 @@
 package com.gtnewhorizon.structurelib.structure.adders;
 
-
 import net.minecraft.block.Block;
 
 public interface IBlockAdder<T> {

src/main/java/com/gtnewhorizon/structurelib/structure/package-info.java

@@ -2,4 +2,4 @@
  * All public stuff in this package and its subpackages are considered part of the public API.
  * Backwards compatibility is maintained to the maximum extend possible.
  */
-package com.gtnewhorizon.structurelib.structure;
+package com.gtnewhorizon.structurelib.structure;

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

@@ -0,0 +1,47 @@
+package com.gtnewhorizon.structurelib.util;
+
+import java.util.Iterator;
+import java.util.NoSuchElementException;
+import net.minecraft.inventory.IInventory;
+import net.minecraft.item.ItemStack;
+
+public class InventoryIterable<Inv extends IInventory> implements Iterable<ItemStack> {
+    private final Inv inv;
+    private final int maxSlot;
+
+    public InventoryIterable(Inv inv) {
+        this(inv, -1);
+    }
+
+    InventoryIterable(Inv inv, int maxSlot) {
+        this.inv = inv;
+        this.maxSlot = maxSlot;
+    }
+
+    public Inv getInventory() {
+        return inv;
+    }
+
+    @Override
+    public Iterator<ItemStack> iterator() {
+        return new Iterator<ItemStack>() {
+            private int ptr = 0;
+
+            @Override
+            public boolean hasNext() {
+                return ptr < inv.getSizeInventory() && (maxSlot == -1 || ptr < maxSlot);
+            }
+
+            @Override
+            public ItemStack next() {
+                if (!hasNext()) throw new NoSuchElementException();
+                return inv.getStackInSlot(ptr++);
+            }
+
+            @Override
+            public void remove() {
+                inv.setInventorySlotContents(ptr - 1, null);
+            }
+        };
+    }
+}

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

@@ -0,0 +1,391 @@
+/**
+ * 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 com.gtnewhorizon.gtnhlib.util.map.ItemStackMap;
+import com.gtnewhorizon.structurelib.util.InventoryUtility.ItemStackExtractor.APIType;
+import com.gtnewhorizon.structurelib.util.ItemStackPredicate.NBTMode;
+import java.util.*;
+import java.util.concurrent.CopyOnWriteArrayList;
+import java.util.function.Function;
+import java.util.function.Predicate;
+import javax.annotation.Nonnull;
+import javax.annotation.Nullable;
+import net.minecraft.entity.player.EntityPlayerMP;
+import net.minecraft.entity.player.InventoryPlayer;
+import net.minecraft.init.Items;
+import net.minecraft.inventory.IInventory;
+import net.minecraft.inventory.InventoryEnderChest;
+import net.minecraft.item.ItemStack;
+
+/**
+ * This class is part of API, but is not stable. Use at your own risk.
+ */
+public class InventoryUtility {
+    private static final SortedRegistry<ItemStackExtractor> stackExtractors = new SortedRegistry<>();
+    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<>();
+
+    static {
+        inventoryProviders.register("5000-main-inventory", new InventoryProvider<InventoryIterable<InventoryPlayer>>() {
+            @Override
+            public InventoryIterable<InventoryPlayer> getInventory(EntityPlayerMP player) {
+                return new InventoryIterable<>(player.inventory, player.inventory.mainInventory.length);
+            }
+
+            @Override
+            public void markDirty(InventoryIterable<InventoryPlayer> inv) {
+                // player save its content using means other than inv.markDirty()
+                // here we only need to sync it to client
+                inv.getInventory().player.inventoryContainer.detectAndSendChanges();
+            }
+        });
+        inventoryProviders.register(
+                "7000-ender-inventory", new InventoryProvider<InventoryIterable<InventoryEnderChest>>() {
+                    @Override
+                    public InventoryIterable<InventoryEnderChest> getInventory(EntityPlayerMP player) {
+                        if (enableEnder.stream().anyMatch(p -> p.test(player)))
+                            return new InventoryIterable<>(player.getInventoryEnderChest());
+                        return null;
+                    }
+
+                    @Override
+                    public void markDirty(InventoryIterable<InventoryEnderChest> inv) {
+                        // inv.getInventory().markDirty();
+                        // TODO this seems to be a noop
+                    }
+                });
+    }
+
+    public static void registerEnableEnderCondition(Predicate<? super EntityPlayerMP> predicate) {
+        enableEnder.add(predicate);
+    }
+
+    public static void registerStackExtractor(String key, ItemStackExtractor val) {
+        if (Arrays.stream(APIType.values()).noneMatch(val::isAPIImplemented))
+            throw new IllegalArgumentException("Must implement at least one API");
+        stackExtractors.register(key, val);
+    }
+
+    public static <Inv extends IInventory> void registerStackExtractor(
+            String key, Function<ItemStack, ? extends Inv> extractor) {
+        registerStackExtractor(key, newItemStackProvider(extractor));
+    }
+
+    public static void registerInventoryProvider(String key, InventoryProvider<?> val) {
+        inventoryProviders.register(key, val);
+    }
+
+    public static <Inv extends IInventory> void registerInventoryProvider(
+            String key, Function<EntityPlayerMP, ? extends Inv> extractor) {
+        registerInventoryProvider(key, newInventoryProvider(extractor));
+    }
+
+    public static Iterator<? extends ItemStackExtractor> getStackExtractors() {
+        return stackExtractors.iterator();
+    }
+
+    public static <Inv extends IInventory> InventoryProvider<InventoryIterable<Inv>> newInventoryProvider(
+            Function<EntityPlayerMP, ? extends Inv> extractor) {
+        return new InventoryProvider<InventoryIterable<Inv>>() {
+            @Override
+            public InventoryIterable<Inv> getInventory(EntityPlayerMP player) {
+                Inv inv = extractor.apply(player);
+                return inv != null ? new InventoryIterable<>(inv) : null;
+            }
+
+            @Override
+            public void markDirty(InventoryIterable<Inv> inv) {
+                inv.getInventory().markDirty();
+            }
+        };
+    }
+
+    public static ItemStackExtractor newItemStackProvider(Function<ItemStack, ? extends IInventory> extractor) {
+        return new ItemStackExtractor() {
+            @Override
+            public boolean isAPIImplemented(APIType type) {
+                return type == APIType.MAIN;
+            }
+
+            @Override
+            public int takeFromStack(
+                    Predicate<ItemStack> predicate,
+                    boolean simulate,
+                    int count,
+                    ItemStackCounter store,
+                    ItemStack stack,
+                    ItemStack filter,
+                    EntityPlayerMP player) {
+                IInventory inv = extractor.apply(stack);
+                if (inv == null) return 0;
+                int found = takeFromInventory(
+                        new InventoryIterable<>(inv), predicate, simulate, count, store, filter, player, false);
+                if (found > 0) inv.markDirty();
+                return found;
+            }
+        };
+    }
+
+    /**
+     * take count amount of stacks that matches given filter. might take partial amount of stuff, so simulation is suggested
+     * if you ever need to take more than one.
+     *
+     * @param player    source of stacks
+     * @param predicate item stack filter
+     * @param simulate  whether to do removal
+     * @param count     let's hope int size is enough...
+     * @return amount taken. never negative nor bigger than count...
+     */
+    public static Map<ItemStack, Integer> takeFromInventory(
+            EntityPlayerMP player, Predicate<ItemStack> predicate, boolean simulate, int count) {
+        ItemStackCounterImpl store = new ItemStackCounterImpl();
+        int sum = 0;
+        for (InventoryProvider<?> provider : inventoryProviders) {
+            sum += takeFromPlayer(player, predicate, simulate, count - sum, store, provider, null);
+            if (sum >= count) return store.getStore();
+        }
+        return store.getStore();
+    }
+
+    /**
+     * take count amount of stacks that matches given filter. might take partial amount of stuff, so simulation is suggested
+     * if you ever need to take more than one.
+     *
+     * @param player   source of stacks
+     * @param filter   the precise type of item to extract. stackSize matters
+     * @param simulate whether to do removal
+     * @return amount taken. never negative nor bigger than count...
+     */
+    public static int takeFromInventory(EntityPlayerMP player, ItemStack filter, boolean simulate) {
+        int sum = 0;
+        int count = filter.stackSize;
+        ItemStackPredicate predicate = ItemStackPredicate.from(filter, NBTMode.EXACT);
+        ItemStackCounterImpl store = new ItemStackCounterImpl();
+        for (InventoryProvider<?> provider : inventoryProviders) {
+            sum += takeFromPlayer(player, predicate, simulate, count - sum, store, provider, filter);
+            if (sum >= count) return sum;
+        }
+        return sum;
+    }
+
+    // workaround java generics issue
+    private static <R extends Iterable<ItemStack>> int takeFromPlayer(
+            EntityPlayerMP player,
+            Predicate<ItemStack> predicate,
+            boolean simulate,
+            int count,
+            ItemStackCounterImpl store,
+            InventoryProvider<R> provider,
+            ItemStack filter) {
+        R inv = provider.getInventory(player);
+        if (inv == null) return 0;
+        int taken = takeFromInventory(inv, predicate, simulate, count, store, filter, player, true);
+        if (taken > 0) provider.markDirty(inv);
+        return taken;
+    }
+
+    /**
+     * take count amount of stacks that matches given filter. Will do 1 level of recursion to try find more stacks....
+     * e.g. from backpacks...
+     *
+     * @param inv       source of stacks
+     * @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}
+     * @return amount taken. never negative nor bigger than count...
+     */
+    public static Map<ItemStack, Integer> takeFromInventory(
+            Iterable<ItemStack> inv, Predicate<ItemStack> predicate, boolean simulate, int count, boolean recursive) {
+        ItemStackCounterImpl store = new ItemStackCounterImpl();
+        takeFromInventory(inv, predicate, simulate, count, store, null, null, recursive);
+        return store.getStore();
+    }
+
+    private static int takeFromInventory(
+            @Nonnull Iterable<ItemStack> inv,
+            @Nonnull Predicate<ItemStack> predicate,
+            boolean simulate,
+            int count,
+            @Nonnull ItemStackCounter store,
+            @Nullable ItemStack filter,
+            @Nullable EntityPlayerMP player,
+            boolean recursive) {
+        int found = 0;
+        ItemStack copiedFilter = null;
+        if (filter != null) {
+            copiedFilter = new ItemStack(filter.getItem(), filter.stackSize, Items.feather.getDamage(filter));
+            copiedFilter.setTagCompound(filter.stackTagCompound);
+        }
+        for (Iterator<ItemStack> iterator = inv.iterator(); iterator.hasNext(); ) {
+            ItemStack stack = iterator.next();
+            // invalid stack
+            if (stack == null || stack.getItem() == null || stack.stackSize <= 0) continue;
+
+            if (predicate.test(stack)) {
+                found += stack.stackSize;
+                if (found > count) {
+                    int surplus = found - count;
+                    store.add(stack, stack.stackSize - surplus);
+                    if (!simulate) {
+                        // leave the surplus in its place
+                        stack.stackSize = surplus;
+                    }
+                    return count;
+                }
+                store.add(stack, stack.stackSize);
+                if (!simulate) iterator.remove();
+                if (found == count) return count;
+            }
+            if (!recursive) continue;
+            for (ItemStackExtractor f : stackExtractors) {
+                if (filter != null && f.isAPIImplemented(APIType.EXTRACT_ONE_STACK)) {
+                    copiedFilter.stackSize = count - found;
+                    found += f.getItem(stack, copiedFilter, simulate, player);
+                } else {
+                    found += f.takeFromStack(predicate, simulate, count - found, store, stack, filter, player);
+                }
+                if (found >= count) return found;
+            }
+        }
+        return found;
+    }
+
+    public interface OptimizedExtractor {
+        /**
+         * 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.
+         * <p>
+         * Whether optimized extractor do recursive extraction is at the discretion of implementor.
+         *
+         * @param source    from where an extraction should be attempted
+         * @param toExtract stack to extract. should not be mutated! match the NBT tag using EXACT mode.
+         * @param simulate  true if only query but does not actually remove
+         * @param player    executor of extraction, or null if from a machine
+         * @return amount extracted
+         */
+        int extract(ItemStack source, ItemStack toExtract, boolean simulate, EntityPlayerMP player);
+    }
+
+    public interface InventoryProvider<R extends Iterable<ItemStack>> {
+        R getInventory(EntityPlayerMP player);
+
+        void markDirty(R inv);
+    }
+
+    public interface ItemStackExtractor {
+        enum APIType {
+            MAIN,
+            EXTRACT_ONE_STACK,
+        }
+
+        boolean isAPIImplemented(APIType type);
+
+        /**
+         * 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.
+         * <p>
+         * Whether this method does recursive extraction is at the discretion of implementor.
+         *
+         * @param predicate the main filtering predicate. never null. It's assumed predicate always returns true on filter,
+         *                  if that is not null
+         * @param store     where to store extracted items. Should increment the
+         * @param source    from where an extraction should be attempted
+         * @param filter    stack to extract. should not be mutated! match the NBT tag using EXACT mode. might be null.
+         * @param simulate  true if only query but does not actually remove
+         * @param player    executor of extraction, or null if from a machine
+         * @return amount extracted, or -1 if this is not implemented
+         */
+        int takeFromStack(
+                Predicate<ItemStack> predicate,
+                boolean simulate,
+                int count,
+                ItemStackCounter store,
+                ItemStack source,
+                ItemStack filter,
+                EntityPlayerMP player);
+
+        /**
+         * 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.
+         * <p>
+         * Whether this method does recursive extraction is at the discretion of implementor.
+         *
+         * @param source    from where an extraction should be attempted
+         * @param toExtract stack to extract. should not be mutated! match the NBT tag using EXACT mode.
+         * @param simulate  true if only query but does not actually remove
+         * @param player    executor of extraction, or null if from a machine
+         * @return amount extracted, or -1 if this is not implemented
+         */
+        default int getItem(ItemStack source, ItemStack toExtract, boolean simulate, EntityPlayerMP player) {
+            return -1;
+        }
+
+        static ItemStackExtractor createOnlyOptimized(@Nonnull OptimizedExtractor optimizedExtractor) {
+            return new ItemStackExtractor() {
+                @Override
+                public boolean isAPIImplemented(APIType type) {
+                    return type == APIType.EXTRACT_ONE_STACK;
+                }
+
+                @Override
+                public int takeFromStack(
+                        Predicate<ItemStack> predicate,
+                        boolean simulate,
+                        int count,
+                        ItemStackCounter store,
+                        ItemStack stack,
+                        ItemStack filter,
+                        EntityPlayerMP player) {
+                    return 0;
+                }
+
+                @Override
+                public int getItem(ItemStack source, ItemStack toExtract, boolean simulate, EntityPlayerMP player) {
+                    return optimizedExtractor.extract(source, toExtract, simulate, player);
+                }
+            };
+        }
+    }
+
+    public interface ItemStackCounter {
+        /**
+         * Add some amount of stack. Note stackSize is used instead of stack.stackSize.
+         */
+        void add(ItemStack stack, int stackSize);
+    }
+
+    private static class ItemStackCounterImpl implements ItemStackCounter {
+        private final Map<ItemStack, Integer> store = new ItemStackMap<>(true);
+
+        @Override
+        public void add(ItemStack stack, int stackSize) {
+            if (stack == null || stack.getItem() == null || stackSize <= 0) throw new IllegalArgumentException();
+            store.merge(stack, stackSize, Integer::sum);
+        }
+
+        public Map<ItemStack, Integer> getStore() {
+            return store;
+        }
+    }
+}

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

@@ -0,0 +1,38 @@
+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/ItemStackPredicate.java

@@ -0,0 +1,112 @@
+package com.gtnewhorizon.structurelib.util;
+
+import java.util.Objects;
+import java.util.function.BiPredicate;
+import java.util.function.Predicate;
+import net.minecraft.block.Block;
+import net.minecraft.init.Items;
+import net.minecraft.item.Item;
+import net.minecraft.item.ItemStack;
+import net.minecraft.nbt.NBTBase;
+import net.minecraft.nbt.NBTTagCompound;
+
+public final class ItemStackPredicate implements Predicate<ItemStack> {
+    public static ItemStackPredicate from(Item item) {
+        return new ItemStackPredicate(item);
+    }
+
+    public static ItemStackPredicate from(ItemStack itemStack) {
+        return new ItemStackPredicate(itemStack.getItem()).setMeta(Items.feather.getDamage(itemStack));
+    }
+
+    public static ItemStackPredicate from(ItemStack itemStack, NBTMode mode) {
+        return new ItemStackPredicate(itemStack.getItem())
+                .setMeta(Items.feather.getDamage(itemStack))
+                .setTag(mode, itemStack.stackTagCompound);
+    }
+
+    public static ItemStackPredicate from(Block block) {
+        return new ItemStackPredicate(Item.getItemFromBlock(block));
+    }
+
+    private final Item item;
+    private int meta = -1;
+
+    private NBTTagCompound tag;
+    private NBTMode mode = NBTMode.IGNORE;
+
+    private ItemStackPredicate(Item item) {
+        this.item = item;
+    }
+
+    public ItemStackPredicate ignoreMeta() {
+        this.meta = -1;
+        return this;
+    }
+
+    public ItemStackPredicate setMeta(int meta) {
+        this.meta = meta;
+        return this;
+    }
+
+    public ItemStackPredicate setTag(NBTMode mode, NBTTagCompound tag) {
+        this.mode = mode;
+        this.tag = tag;
+        return this;
+    }
+
+    @Override
+    public boolean test(ItemStack itemStack) {
+        if (item != null) if (itemStack.getItem() != item) return false;
+        if (meta != -1) if (Items.feather.getDamage(itemStack) != meta) return false;
+        return mode.test(tag, itemStack.stackTagCompound);
+    }
+
+    public enum NBTMode implements BiPredicate<NBTTagCompound, NBTTagCompound> {
+        IGNORE {
+            @Override
+            public boolean test(NBTTagCompound lhs, NBTTagCompound rhs) {
+                return true;
+            }
+        },
+        IN {
+            @Override
+            public boolean test(NBTTagCompound lhs, NBTTagCompound rhs) {
+                if (lhs == null || lhs.hasNoTags()) return true;
+                if (rhs == null || rhs.hasNoTags()) return false;
+                for (String key : MiscUtils.getTagKeys(lhs)) {
+                    if (!rhs.hasKey(key, lhs.func_150299_b(key))) return false;
+                    NBTBase tag = lhs.getTag(key);
+                    if (tag instanceof NBTTagCompound) {
+                        if (!test((NBTTagCompound) tag, rhs.getCompoundTag(key))) return false;
+                    } else {
+                        if (!tag.equals(rhs.getTag(key))) return false;
+                    }
+                }
+                return true;
+            }
+        },
+        EXACT {
+            @Override
+            public boolean test(NBTTagCompound lhs, NBTTagCompound rhs) {
+                if (lhs != null && lhs.hasNoTags()) lhs = null;
+                if (rhs != null && rhs.hasNoTags()) rhs = null;
+                return Objects.equals(lhs, rhs);
+            }
+        },
+        IGNORE_KNOWN_INSIGNIFICANT_TAGS {
+            @Override
+            public boolean test(NBTTagCompound lhs, NBTTagCompound rhs) {
+                // fast path for empty tags
+                if (rhs == null || rhs.hasNoTags()) return lhs == null || lhs.hasNoTags();
+                // TODO make an implementation without copying a potentially huge tag
+                rhs = (NBTTagCompound) rhs.copy();
+                for (String s : KNOWN_INSIGNIFICANT_TAGS) rhs.removeTag(s);
+                return EXACT.test(lhs, rhs);
+            }
+        };
+        private static final String[] KNOWN_INSIGNIFICANT_TAGS = {
+            "display", // TODO expand/refine this
+        };
+    }
+}

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

@@ -0,0 +1,16 @@
+package com.gtnewhorizon.structurelib.util;
+
+import java.util.Set;
+import net.minecraft.nbt.NBTTagCompound;
+
+/**
+ * not related to a certain mod!
+ */
+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

@@ -0,0 +1,57 @@
+package com.gtnewhorizon.structurelib.util;
+
+import java.util.*;
+import java.util.function.Consumer;
+
+public class SortedRegistry<V> implements Iterable<V> {
+    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();
+
+    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);
+        }
+        // TODO allow a user to edit the order with a configuration file
+        baked = new ArrayList<>(store.values());
+    }
+
+    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);
+    }
+
+    @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/util/Vec3Impl.java

@@ -57,7 +57,9 @@ public class Vec3Impl implements Comparable<Vec3Impl> {
     }
 
     public Vec3Impl offset(ForgeDirection facing, int n) {
-        return n == 0 ? this : new Vec3Impl(val0 + facing.offsetX * n, val1 + facing.offsetY * n, val2 + facing.offsetZ * n);
+        return n == 0
+                ? this
+                : new Vec3Impl(val0 + facing.offsetX * n, val1 + facing.offsetY * n, val2 + facing.offsetZ * n);
     }
 
     public Vec3Impl add(Vec3Impl pos) {
@@ -77,8 +79,10 @@ public class Vec3Impl implements Comparable<Vec3Impl> {
     }
 
     public Vec3Impl crossProduct(Vec3Impl vec) {
-        return new Vec3Impl(val1 * vec.val2 - val2 * vec.val1, val2 * vec.val0 - val0 * vec.val2,
-            val0 * vec.val1 - val1 * vec.val0);
+        return new Vec3Impl(
+                val1 * vec.val2 - val2 * vec.val1,
+                val2 * vec.val0 - val0 * vec.val2,
+                val0 * vec.val1 - val1 * vec.val0);
     }
 
     public boolean withinDistance(Vec3Impl to, double distance) {

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

@@ -1,28 +1,28 @@
 package com.gtnewhorizon.structurelib.util;
 /*
-  A subclass of java.util.random that implements the Xorshift random number
-  generator
-  <p>
-  - it is 30% faster than the generator from Java's library - it produces
-  random sequences of higher quality than java.util.Random - this class also
-  provides a clone() function
-  <p>
-  Usage: XSRandom rand = new XSRandom(); //Instantiation x = rand.nextInt();
-  //pull a random number
-  <p>
-  To use the class in legacy code, you may also instantiate an XSRandom object
-  and assign it to a java.util.Random object: java.util.Random rand = new
-  XSRandom();
-  <p>
-  for an explanation of the algorithm, see
-  http://demesos.blogspot.com/2011/09/pseudo-random-number-generators.html
+ A subclass of java.util.random that implements the Xorshift random number
+ generator
+ <p>
+ - it is 30% faster than the generator from Java's library - it produces
+ random sequences of higher quality than java.util.Random - this class also
+ provides a clone() function
+ <p>
+ Usage: XSRandom rand = new XSRandom(); //Instantiation x = rand.nextInt();
+ //pull a random number
+ <p>
+ To use the class in legacy code, you may also instantiate an XSRandom object
+ and assign it to a java.util.Random object: java.util.Random rand = new
+ XSRandom();
+ <p>
+ for an explanation of the algorithm, see
+ http://demesos.blogspot.com/2011/09/pseudo-random-number-generators.html
 
-  @author Wilfried Elmenreich University of Klagenfurt/Lakeside Labs
- * http://www.elmenreich.tk
- * <p>
- * This code is released under the GNU Lesser General Public License Version 3
- * http://www.gnu.org/licenses/lgpl-3.0.txt
- */
+ @author Wilfried Elmenreich University of Klagenfurt/Lakeside Labs
+* http://www.elmenreich.tk
+* <p>
+* This code is released under the GNU Lesser General Public License Version 3
+* http://www.gnu.org/licenses/lgpl-3.0.txt
+*/
 
 import java.util.Random;
 import java.util.concurrent.atomic.AtomicLong;
@@ -40,7 +40,7 @@ public class XSTR extends Random {
     private static final long GAMMA = 0x9e3779b97f4a7c15L;
     private static final int PROBE_INCREMENT = 0x9e3779b9;
     private static final long SEEDER_INCREMENT = 0xbb67ae8584caa73bL;
-    private static final double DOUBLE_UNIT = 0x1.0p-53;  // 1.0  / (1L << 53)
+    private static final double DOUBLE_UNIT = 0x1.0p-53; // 1.0  / (1L << 53)
     private static final float FLOAT_UNIT = 0x1.0p-24f; // 1.0f / (1 << 24)
     private static final AtomicLong seedUniquifier = new AtomicLong(8682522807148012L);
     public static final XSTR XSTR_INSTANCE = new XSTR() {
@@ -53,9 +53,9 @@ public class XSTR extends Random {
     };
 
     /*
-     MODIFIED BY: Robotia
-     Modification: Implemented Random class seed generator
-     */
+    MODIFIED BY: Robotia
+    Modification: Implemented Random class seed generator
+    */
 
     /**
      * Creates a new pseudo random number generator. The seed is initialized to
@@ -226,9 +226,9 @@ public class XSTR extends Random {
      */
     @Override
     public int nextInt(int bound) {
-        //if (bound <= 0) {
-        //throw new RuntimeException("BadBound");
-        //}
+        // if (bound <= 0) {
+        // throw new RuntimeException("BadBound");
+        // }
 
         /*int r = next(31);
         int m = bound - 1;
@@ -242,7 +242,7 @@ public class XSTR extends Random {
                 ;
         }
         return r;*/
-        //speedup, new nextInt ~+40%
+        // speedup, new nextInt ~+40%
         long last = seed ^ seed << 21;
         last ^= last >>> 35;
         last ^= last << 4;
@@ -270,7 +270,9 @@ public class XSTR extends Random {
     @Override
     public void nextBytes(byte[] bytes_arr) {
         for (int iba = 0, lenba = bytes_arr.length; iba < lenba; ) {
-            for (int rndba = nextInt(), nba = Math.min(lenba - iba, Integer.SIZE / Byte.SIZE); nba-- > 0; rndba >>= Byte.SIZE) {
+            for (int rndba = nextInt(), nba = Math.min(lenba - iba, Integer.SIZE / Byte.SIZE);
+                    nba-- > 0;
+                    rndba >>= Byte.SIZE) {
                 bytes_arr[iba++] = (byte) rndba;
             }
         }

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

@@ -24,8 +24,24 @@ item.structurelib.constructableTrigger.name=Multiblock Structure Hologram Projec
 item.structurelib.constructableTrigger.desc.0=Triggers Constructable Interface
 item.structurelib.constructableTrigger.desc.1=Shows multiblock construction schematic,
 item.structurelib.constructableTrigger.desc.2=use on the multiblock controller.
-item.structurelib.constructableTrigger.desc.3=(Sneak use on controller in creative to build)
+item.structurelib.constructableTrigger.desc.3=(Sneak use on controller to build)
 item.structurelib.constructableTrigger.desc.4=Quantity of schematics in item stack affects tier/mode/type
+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.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
+
+structurelib.autoplace.built_stat=Built %s blocks
+structurelib.autoplace.complete=§aThis multiblock has completed!
+structurelib.autoplace.error.not_enabled=§cThis multiblock does not support autoplace in survival!
+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§c. Using master channel instead.
 
 structurelib.blockhint.desc.0=Helps while building
 structurelib.blockhint.0.name=Hint 1 dot

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

@@ -24,8 +24,23 @@ item.structurelib.constructableTrigger.name=多方块结构全息投影仪
 item.structurelib.constructableTrigger.desc.0=可以显示多方块机器的结构
 item.structurelib.constructableTrigger.desc.1=只能在多方块主机上使用，将会显示机器
 item.structurelib.constructableTrigger.desc.2=结构的示意图。 (译者注：请搭高使用)
-item.structurelib.constructableTrigger.desc.3= (创造模式下潜行右键可以直接完成搭建)
+item.structurelib.constructableTrigger.desc.3= (潜行右键可以直接完成搭建)
 item.structurelib.constructableTrigger.desc.4=此物品堆叠数量会影响显示的机器等级/模式/类型
+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.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
+
+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！
+structurelib.autoplace.error.not_enabled=§c这个多方块结构不支持在生存模式下自动搭建！
+structurelib.autoplace.error.no_simple_block=§c建议放置§r%s§c，但没有找到它
+structurelib.autoplace.error.no_item_stack=§c建议使用§r%s§c放置方块，但没有找到它
 
 structurelib.blockhint.desc.0=帮助你搭建机器
 structurelib.blockhint.0.name=提示方块：1号