Add a mechanism to dump the registry- useful for mod developers.

common/cpw/mods/fml/common/Loader.java

@@ -13,6 +13,7 @@
 package cpw.mods.fml.common;
 
 import java.io.File;
+import java.io.FileOutputStream;
 import java.io.FileReader;
 import java.io.IOException;
 import java.net.MalformedURLException;
@@ -26,15 +27,20 @@ import java.util.concurrent.Callable;
 import java.util.logging.Level;
 
 import net.minecraft.crash.CallableMinecraftVersion;
+import net.minecraft.item.ItemStack;
 
 import com.google.common.base.CharMatcher;
+import com.google.common.base.Charsets;
 import com.google.common.base.Function;
 import com.google.common.base.Joiner;
+import com.google.common.base.Joiner.MapJoiner;
 import com.google.common.base.Splitter;
 import com.google.common.collect.ArrayListMultimap;
 import com.google.common.collect.BiMap;
 import com.google.common.collect.HashBiMap;
 import com.google.common.collect.ImmutableList;
+import com.google.common.collect.ImmutableListMultimap;
+import com.google.common.collect.ImmutableListMultimap.Builder;
 import com.google.common.collect.ImmutableMap;
 import com.google.common.collect.ImmutableMultiset;
 import com.google.common.collect.Iterables;
@@ -47,7 +53,9 @@ import com.google.common.collect.Multiset.Entry;
 import com.google.common.collect.Multisets;
 import com.google.common.collect.Ordering;
 import com.google.common.collect.Sets.SetView;
+import com.google.common.collect.Table;
 import com.google.common.collect.TreeMultimap;
+import com.google.common.io.Files;
 
 import cpw.mods.fml.common.LoaderState.ModState;
 import cpw.mods.fml.common.discovery.ModDiscoverer;
@@ -686,6 +694,8 @@ public class Loader
         modController.distributeStateMessage(LoaderState.POSTINITIALIZATION);
         modController.transition(LoaderState.AVAILABLE);
         modController.distributeStateMessage(LoaderState.AVAILABLE);
+        // Dump the custom registry data map, if necessary
+        GameData.dumpRegistry(minecraftDir);
         FMLLog.info("Forge Mod Loader has successfully loaded %d mod%s", mods.size(), mods.size()==1 ? "" : "s");
     }
 
@@ -810,4 +820,5 @@ public class Loader
         }
         return true;
     }
+
 }

common/cpw/mods/fml/common/registry/GameData.java

@@ -29,9 +29,13 @@ import net.minecraft.item.ItemStack;
 import net.minecraft.nbt.NBTTagCompound;
 import net.minecraft.nbt.NBTTagList;
 
+import com.google.common.base.Charsets;
 import com.google.common.base.Function;
+import com.google.common.base.Joiner;
 import com.google.common.base.Throwables;
+import com.google.common.base.Joiner.MapJoiner;
 import com.google.common.collect.HashBasedTable;
+import com.google.common.collect.ImmutableListMultimap;
 import com.google.common.collect.ImmutableMap;
 import com.google.common.collect.ImmutableTable;
 import com.google.common.collect.ImmutableTable.Builder;
@@ -42,6 +46,7 @@ import com.google.common.collect.Maps;
 import com.google.common.collect.Sets;
 import com.google.common.collect.Table;
 import com.google.common.collect.Table.Cell;
+import com.google.common.io.Files;
 
 import cpw.mods.fml.common.FMLLog;
 import cpw.mods.fml.common.Loader;
@@ -329,4 +334,31 @@ public class GameData {
     {
         customItemStacks.put(Loader.instance().activeModContainer().getModId(), name, itemStack);
     }
+
+    public static void dumpRegistry(File minecraftDir)
+    {
+        if (customItemStacks == null)
+        {
+            return;
+        }
+        if (Boolean.valueOf(System.getProperty("fml.dumpRegistry", "false")).booleanValue())
+        {
+            ImmutableListMultimap.Builder<String, String> builder = ImmutableListMultimap.builder();
+            for (String modId : customItemStacks.rowKeySet())
+            {
+                builder.putAll(modId, customItemStacks.row(modId).keySet());
+            }
+
+            File f = new File(minecraftDir, "itemStackRegistry.csv");
+            MapJoiner mapJoiner = Joiner.on("\n").withKeyValueSeparator(",");
+            try
+            {
+                Files.write(mapJoiner.join(builder.build().entries()), f, Charsets.UTF_8);
+            }
+            catch (IOException e)
+            {
+                FMLLog.log(Level.SEVERE, e, "Failed to write registry data to %s", f.getAbsolutePath());
+            }
+        }
+    }
 }