Get commands to work

src/main/java/land/chipmunk/chipmunkmod/command/CommandManager.java

@@ -0,0 +1,70 @@
+package land.chipmunk.chipmunkmod.command;
+
+import com.mojang.brigadier.CommandDispatcher;
+import com.mojang.brigadier.arguments.ArgumentType;
+import com.mojang.brigadier.builder.LiteralArgumentBuilder;
+import com.mojang.brigadier.builder.RequiredArgumentBuilder;
+import com.mojang.brigadier.exceptions.CommandSyntaxException;
+import net.minecraft.command.CommandException;
+import net.minecraft.text.ClickEvent;
+import net.minecraft.text.Text;
+import net.minecraft.text.Texts;
+import net.minecraft.text.MutableText;
+import net.minecraft.util.Formatting;
+import net.minecraft.client.MinecraftClient;
+import net.fabricmc.fabric.api.client.command.v2.FabricClientCommandSource;
+import land.chipmunk.chipmunkmod.commands.*;
+
+public class CommandManager {
+  public static CommandDispatcher<FabricClientCommandSource> dispatcher = new CommandDispatcher();
+  public static String prefix = ".";
+
+  public static void executeCommand (String command) {
+    final MinecraftClient client = MinecraftClient.getInstance();
+
+    final FabricClientCommandSource commandSource = (FabricClientCommandSource) client.getNetworkHandler().getCommandSource();
+
+    try {
+      dispatcher.execute(command, commandSource);
+    } catch (CommandSyntaxException e) {
+      commandSource.sendError(Texts.toText(e.getRawMessage()));
+      commandSource.sendError(getContext(e));
+    } catch (CommandException e) {
+      commandSource.sendError(e.getTextMessage());
+    } catch (RuntimeException e) {
+      commandSource.sendError(Text.of(e.getMessage()));
+    }
+  }
+
+  public static Text getContext (CommandSyntaxException exception) {
+    final int _cursor = exception.getCursor();
+    final String input = exception.getInput();
+
+    if (input == null || _cursor < 0) {
+      return null;
+    }
+    final MutableText text = Text.literal("")
+      .formatted(Formatting.GRAY);
+    text.setStyle(text.getStyle().withClickEvent(new ClickEvent(ClickEvent.Action.SUGGEST_COMMAND, prefix + input)));
+
+    final int cursor = Math.min(input.length(), _cursor);
+
+    if (cursor > CommandSyntaxException.CONTEXT_AMOUNT) {
+      text.append(Text.literal("..."));
+    }
+
+    text
+      .append(Text.literal(input.substring(Math.max(0, cursor - CommandSyntaxException.CONTEXT_AMOUNT), cursor)))
+      .append(Text.literal(input.substring(cursor)).formatted(Formatting.RED, Formatting.UNDERLINE))
+      .append(Text.translatable("command.context.here").formatted(Formatting.RED, Formatting.ITALIC));
+
+    return text;
+  }
+
+  public static LiteralArgumentBuilder<FabricClientCommandSource> literal (String name) { return LiteralArgumentBuilder.<FabricClientCommandSource>literal(name); }
+  public static <T> RequiredArgumentBuilder<FabricClientCommandSource, T> argument (String name, ArgumentType<T> type) { return RequiredArgumentBuilder.<FabricClientCommandSource, T>argument(name, type); }
+
+  static {
+    TestCommand.register(dispatcher);
+  }
+}

src/main/java/land/chipmunk/chipmunkmod/commands/TestCommand.java

@@ -0,0 +1,24 @@
+package land.chipmunk.chipmunkmod.commands;
+
+import com.mojang.brigadier.Command;
+import com.mojang.brigadier.CommandDispatcher;
+import com.mojang.brigadier.context.CommandContext;
+import static land.chipmunk.chipmunkmod.command.CommandManager.literal;
+import net.fabricmc.fabric.api.client.command.v2.FabricClientCommandSource;
+import net.minecraft.text.Text;
+
+public class TestCommand {
+  public static void register (CommandDispatcher<FabricClientCommandSource> dispatcher) {
+    dispatcher.register(
+      literal("test")
+        .executes(c -> helloWorld(c))
+    );
+  }
+
+  public static int helloWorld (CommandContext<FabricClientCommandSource> context) {
+    final FabricClientCommandSource source = context.getSource();
+    source.sendFeedback(Text.literal("Hello, world!"));
+
+    return Command.SINGLE_SUCCESS;
+  }
+}

src/main/java/land/chipmunk/chipmunkmod/mixin/ChatScreenMixin.java

@@ -0,0 +1,22 @@
+package land.chipmunk.chipmunkmod.mixin;
+
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfoReturnable;
+import net.minecraft.client.MinecraftClient;
+import land.chipmunk.chipmunkmod.command.CommandManager;
+
+@Mixin(net.minecraft.client.gui.screen.ChatScreen.class)
+public class ChatScreenMixin {
+  @Inject(at = @At("HEAD"), method = "sendMessage", cancellable = true)
+  public void sendMessage(String chatText, boolean addToHistory, CallbackInfoReturnable<Boolean> cir) {
+    if (chatText.startsWith(CommandManager.prefix)) {
+      CommandManager.executeCommand(chatText.substring(CommandManager.prefix.length()));
+
+      if (addToHistory) MinecraftClient.getInstance().inGameHud.getChatHud().addToMessageHistory(chatText);
+
+      cir.setReturnValue(true);
+    }
+  }
+}

src/main/java/land/chipmunk/chipmunkmod/mixin/ExampleMixin.java

@@ -1,16 +0,0 @@
-package land.chipmunk.chipmunkmod.mixin;
-
-import land.chipmunk.chipmunkmod.ChipmunkMod;
-import net.minecraft.client.gui.screen.TitleScreen;
-import org.spongepowered.asm.mixin.Mixin;
-import org.spongepowered.asm.mixin.injection.At;
-import org.spongepowered.asm.mixin.injection.Inject;
-import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
-
-@Mixin(TitleScreen.class)
-public class ExampleMixin {
-  @Inject(at = @At("HEAD"), method = "init()V")
-  private void init(CallbackInfo info) {
-    ChipmunkMod.LOGGER.info("This line is printed by an example mod mixin!");
-  }
-}

src/main/resources/modid.mixins.json

@@ -6,7 +6,7 @@
   "mixins": [
   ],
   "client": [
-    "ExampleMixin"
+    "ChatScreenMixin"
   ],
   "injectors": {
     "defaultRequire": 1