Command suggestions

Closes #1

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

@@ -0,0 +1,50 @@
+package land.chipmunk.chipmunkmod.mixin;
+
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Shadow;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
+import java.util.concurrent.CompletableFuture;
+import com.mojang.brigadier.suggestion.Suggestions;
+import net.minecraft.client.gui.widget.TextFieldWidget;
+import com.mojang.brigadier.CommandDispatcher;
+import com.mojang.brigadier.StringReader;
+import com.mojang.brigadier.exceptions.CommandSyntaxException;
+import net.fabricmc.fabric.api.client.command.v2.FabricClientCommandSource;
+import net.minecraft.client.MinecraftClient;
+import land.chipmunk.chipmunkmod.command.CommandManager;
+
+@Mixin(net.minecraft.client.gui.screen.ChatInputSuggestor.class)
+public class ChatInputSuggestorMixin {
+  @Shadow
+  CompletableFuture<Suggestions> pendingSuggestions;
+
+  @Shadow
+  public void show (boolean narrateFirstSuggestion) {}
+
+  @Shadow
+  final TextFieldWidget textField;
+
+  public ChatInputSuggestorMixin () {
+    textField = null;
+  }
+
+  @Inject(at = @At("TAIL"), method = "refresh()V")
+  public void onRefresh (CallbackInfo ci) {
+    final String text = this.textField.getText();
+    final int cursor = this.textField.getCursor();
+
+    if (cursor < CommandManager.prefix.length() || !text.startsWith(CommandManager.prefix)) return;
+
+    final StringReader reader = new StringReader(text);
+    reader.setCursor(CommandManager.prefix.length()); // Skip the prefix
+
+    final CommandDispatcher<FabricClientCommandSource> dispatcher = CommandManager.dispatcher;
+    final MinecraftClient client = MinecraftClient.getInstance();
+    final FabricClientCommandSource commandSource = (FabricClientCommandSource) client.getNetworkHandler().getCommandSource();
+
+    pendingSuggestions = dispatcher.getCompletionSuggestions(dispatcher.parse(reader, commandSource), cursor);
+    show(true);
+  }
+}

src/main/resources/chipmunkmod.mixins.json

@@ -6,7 +6,8 @@
   "mixins": [
   ],
   "client": [
-    "ChatScreenMixin"
+    "ChatScreenMixin",
+    "ChatInputSuggestorMixin"
   ],
   "injectors": {
     "defaultRequire": 1

src/main/resources/fabric.mod.json

@@ -23,7 +23,7 @@
     ]
   },
   "mixins": [
-    "modid.mixins.json"
+    "chipmunkmod.mixins.json"
   ],
 
   "depends": {