Load categories dynamically from json. Closes #26

src/main/java/exopandora/worldhandler/gui/category/Category.java

@@ -1,7 +1,10 @@
 package exopandora.worldhandler.gui.category;
 
-import java.util.Arrays;
+import java.util.Collections;
+import java.util.HashMap;
 import java.util.List;
+import java.util.Map;
+import java.util.Map.Entry;
 import java.util.stream.Collectors;
 
 import javax.annotation.Nullable;
@@ -27,6 +30,15 @@ public class Category
 {
 	public static IForgeRegistry<Category> REGISTRY;
 	public static final ResourceKey<Registry<Category>> REGISTRY_KEY = ResourceKey.createRegistryKey(new ResourceLocation(Main.MODID, "category"));
+	public static final Map<String, List<String>> DEFAULT_CATEGORIES = new CategoriesBuilder()
+		.add("main", "main", "containers", "multiplayer")
+		.add("entities", "summon", "butcher")
+		.add("items", "custom_item", "enchantment", "recipes")
+		.add("blocks", "edit_blocks", "sign_editor", "note_editor")
+		.add("world", "world", "gamerules", "locate")
+		.add("player", "player", "experience", "advancements")
+		.add("scoreboard", "scoreboard_objectives", "scoreboard_teams", "scoreboard_players")
+		.build();
 	
 	private final List<ResourceLocation> contents;
 	
@@ -45,11 +57,6 @@ public class Category
 		this(Lists.newArrayList(contents));
 	}
 	
-	public Category(String... keys)
-	{
-		this(Arrays.stream(keys).map(key -> new ResourceLocation(Main.MODID, key)).collect(Collectors.toList()));
-	}
-	
 	public Category add(int index, ResourceLocation content)
 	{
 		this.contents.add(Math.min(index, this.getSize()), content);
@@ -91,13 +98,16 @@ public class Category
 	{
 		if(event.getRegistryKey().equals(REGISTRY_KEY))
 		{
-			RegistryHelper.register(event, REGISTRY_KEY, "main", () -> new Category("main", "containers", "multiplayer"));
+			for(Entry<String, List<String>> entry : UsercontentLoader.CATEGORIES.entrySet())
-			RegistryHelper.register(event, REGISTRY_KEY, "entities", () -> new Category("summon", "butcher"));
+			{
-			RegistryHelper.register(event, REGISTRY_KEY, "items", () -> new Category("custom_item", "enchantment", "recipes"));
+				RegistryHelper.register(event, REGISTRY_KEY, entry.getKey(), () ->
-			RegistryHelper.register(event, REGISTRY_KEY, "blocks", () -> new Category("edit_blocks", "sign_editor", "note_editor"));
+				{
-			RegistryHelper.register(event, REGISTRY_KEY, "world", () -> new Category("world", "gamerules", "locate"));
+					var keys = entry.getValue().stream()
-			RegistryHelper.register(event, REGISTRY_KEY, "player", () -> new Category("player", "experience", "advancements"));
+						.map(key -> new ResourceLocation(Main.MODID, key))
-			RegistryHelper.register(event, REGISTRY_KEY, "scoreboard", () -> new Category("scoreboard_objectives", "scoreboard_teams", "scoreboard_players"));
+						.collect(Collectors.toList());
+					return new Category(keys);
+				});
+			}
 			
 			for(UsercontentConfig config : UsercontentLoader.CONFIGS)
 			{
@@ -115,7 +125,7 @@ public class Category
 		{
 			if(!Categories.isRegistered(tab.getCategory()))
 			{
-				RegistryHelper.register(event, REGISTRY_KEY, tab.getCategory(), () -> new Category(id));
+				RegistryHelper.register(event, REGISTRY_KEY, tab.getCategory(), () -> new Category(new ResourceLocation(Main.MODID, id)));
 			}
 			else
 			{
@@ -123,4 +133,20 @@ public class Category
 			}
 		}
 	}
+	
+	private static class CategoriesBuilder
+	{
+		private final Map<String, List<String>> categories = new HashMap<String, List<String>>();
+		
+		public CategoriesBuilder add(String category, String... contents)
+		{
+			this.categories.put(category, Collections.unmodifiableList(Lists.newArrayList(contents)));
+			return this;
+		}
+		
+		public Map<String, List<String>> build()
+		{
+			return Collections.unmodifiableMap(categories);
+		}
+	}
 }

src/main/java/exopandora/worldhandler/usercontent/UsercontentLoader.java

@@ -1,12 +1,15 @@
 package exopandora.worldhandler.usercontent;
 
+import java.io.FileOutputStream;
 import java.io.IOException;
 import java.nio.charset.Charset;
 import java.nio.file.Files;
 import java.nio.file.Path;
 import java.util.ArrayList;
 import java.util.Arrays;
+import java.util.HashMap;
 import java.util.List;
+import java.util.Map;
 import java.util.Optional;
 import java.util.stream.Collectors;
 
@@ -16,6 +19,7 @@ import javax.script.ScriptEngine;
 import org.apache.commons.io.IOUtils;
 import org.openjdk.nashorn.api.scripting.NashornScriptEngineFactory;
 
+import com.google.common.reflect.TypeToken;
 import com.google.gson.Gson;
 import com.google.gson.GsonBuilder;
 import com.google.gson.JsonSyntaxException;
@@ -24,6 +28,7 @@ import com.google.gson.stream.JsonReader;
 import com.google.gson.stream.JsonWriter;
 
 import exopandora.worldhandler.WorldHandler;
+import exopandora.worldhandler.gui.category.Category;
 import exopandora.worldhandler.gui.widget.button.EnumIcon;
 import exopandora.worldhandler.usercontent.model.Action;
 import exopandora.worldhandler.usercontent.model.ArgumentType;
@@ -36,6 +41,7 @@ import net.minecraft.resources.ResourceLocation;
 public class UsercontentLoader
 {
 	public static final List<UsercontentConfig> CONFIGS = new ArrayList<UsercontentConfig>();
+	public static final Map<String, List<String>> CATEGORIES = new HashMap<String, List<String>>(Category.DEFAULT_CATEGORIES);
 	
 	public static void load(Path path)
 	{
@@ -63,7 +69,21 @@ public class UsercontentLoader
 				.registerTypeAdapter(JsonWidget.Type.class, new EnumTypeAdapter<JsonWidget.Type>(JsonWidget.Type.class))
 				.registerTypeAdapter(Action.Type.class, new EnumTypeAdapter<Action.Type>(Action.Type.class))
 				.registerTypeAdapter(JsonMenu.Type.class, new EnumTypeAdapter<JsonMenu.Type>(JsonMenu.Type.class))
+				.setPrettyPrinting()
 				.create();
+		final Path categories = path.resolve("categories.json");
+		
+		if(Files.exists(categories) && Files.isRegularFile(categories) && Files.isReadable(categories))
+		{
+			String fileContents = UsercontentLoader.readFile(categories);
+			UsercontentLoader.CATEGORIES.putAll(gson.fromJson(fileContents, new TypeToken<Map<String, List<String>>>() {}.getType()));
+		}
+		
+		try(FileOutputStream outputStream = new FileOutputStream(categories.toFile()))
+		{
+			IOUtils.write(gson.toJson(UsercontentLoader.CATEGORIES), outputStream, Charset.defaultCharset());
+		}
+		
 		final List<Path> folders = Files.list(path)
 				.filter(Files::isDirectory)
 				.filter(Files::isReadable)