Add support for case insensitive commands (/fIrM)

src/main/java/moe/nea/firmament/mixins/MixinCommandNode.java

@@ -0,0 +1,29 @@
+/*
+ * SPDX-FileCopyrightText: 2023 Linnea Gräf <nea@nea.moe>
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+package moe.nea.firmament.mixins;
+
+import com.llamalad7.mixinextras.injector.wrapoperation.Operation;
+import com.llamalad7.mixinextras.injector.wrapoperation.WrapOperation;
+import com.mojang.brigadier.tree.CommandNode;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+
+import java.util.Locale;
+import java.util.Map;
+
+@Mixin(value = CommandNode.class, remap = false)
+public class MixinCommandNode<S> {
+    @WrapOperation(method = "getRelevantNodes", at = @At(value = "INVOKE", target = "Ljava/util/Map;get(Ljava/lang/Object;)Ljava/lang/Object;"), remap = false)
+    public Object modify(Map map, Object text, Operation<Object> op) {
+        var original = op.call(map, text);
+        if (original == null) {
+            return map.get(((String) text).toLowerCase(Locale.ROOT));
+        }
+        return original;
+    }
+
+}