Add autoprefix command (#647)

* try adding autoprefix

* remove nix files

* add working auto prefix command

* remove more nix files

* add comments on why shift by -2

* use `@ModifyReceiver` for mixin instead

* fix review

* i forgot the alphabet

* fix bug and add custom parameter

* dont include nix stuff in gitignore

* Use a config for setting autoprefix instead

* dont specify getter/setter

src/main/java/net/earthcomputer/clientcommands/Configs.java

@@ -143,6 +143,9 @@ public static void setMaxChorusItemThrows(int maxChorusItemThrows) {
         Configs.maxChorusItemThrows = Mth.clamp(maxChorusItemThrows, 0, 1000000);
     }
 
+    @Config(temporary = true)
+    public static String autoPrefix = "";
+
     @Config(temporary = true, condition = "conditionLessThan1_21")
     public static boolean infiniteTools = false;
 

src/main/java/net/earthcomputer/clientcommands/mixin/commands/generic/ChatScreenMixin.java

@@ -1,22 +1,34 @@
 package net.earthcomputer.clientcommands.mixin.commands.generic;
 
+import com.llamalad7.mixinextras.injector.ModifyReceiver;
+import com.llamalad7.mixinextras.sugar.Local;
+import com.llamalad7.mixinextras.sugar.ref.LocalRef;
 import net.earthcomputer.clientcommands.ClientCommands;
+import net.earthcomputer.clientcommands.Configs;
 import net.earthcomputer.clientcommands.command.VarCommand;
 import net.minecraft.client.gui.screens.ChatScreen;
 import org.spongepowered.asm.mixin.Mixin;
 import org.spongepowered.asm.mixin.injection.At;
-import org.spongepowered.asm.mixin.injection.ModifyVariable;
 
 @Mixin(ChatScreen.class)
 public class ChatScreenMixin {
     // replace the text before the Fabric Command API executes it,
     // but ensure the message is added to the history in its raw form.
-    @ModifyVariable(method = "handleChatInput", at = @At(value = "INVOKE", target = "Ljava/lang/String;startsWith(Ljava/lang/String;)Z", remap = false), argsOnly = true)
-    private String onHandleChatInput(String message) {
-        String command = VarCommand.replaceVariables(message);
+    @ModifyReceiver(method = "handleChatInput", at = @At(value = "INVOKE", target = "Ljava/lang/String;startsWith(Ljava/lang/String;)Z", remap = false))
+    private String onHandleChatInput(String instance, String slash, @Local(argsOnly = true) LocalRef<String> message) {
+        String prefix = Configs.autoPrefix;
+        if (prefix.isEmpty() || instance.startsWith("/")) {
+            prefix = "";
+        } else {
+            prefix = prefix + " ";
+        }
+
+        String command = VarCommand.replaceVariables(prefix + instance);
         if (command.startsWith("/")) {
             ClientCommands.sendCommandExecutionToServer(command.substring(1));
         }
+
+        message.set(command);
         return command;
     }
 }