Support adding run configs in folders

src/main/java/net/neoforged/moddevgradle/dsl/RunModel.java

@@ -65,6 +65,7 @@ public RunModel(String name, Project project, Iterable<ModModel> defaultMods) {
             ideName = project.getName() + " - " + ideName;
         }
         getIdeName().convention(ideName);
+        getIdeFolderName().convention("");
 
         getSourceSet().convention(ExtensionUtils.getSourceSets(project).getByName(SourceSet.MAIN_SOURCE_SET_NAME));
     }
@@ -80,6 +81,12 @@ public String getName() {
      */
     public abstract Property<String> getIdeName();
 
+    /**
+     * Name for the folder the run configuration is contained by in the IDE.
+     * If this is set to {@code ""}, no folder will be used.
+     */
+    public abstract Property<String> getIdeFolderName();
+
     /**
      * Directory that the game will run in. Defaults to {@code run/}.
      */

src/main/java/net/neoforged/moddevgradle/internal/IntelliJIntegration.java

@@ -4,6 +4,7 @@
 import java.io.IOException;
 import java.nio.file.Files;
 import java.util.ArrayList;
+import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 import java.util.Set;
@@ -175,7 +176,7 @@ private static void addIntelliJRunConfiguration(Project project,
             @Nullable Function<Project, File> outputDirectory,
             RunModel run,
             PrepareRun prepareTask) {
-        var appRun = new Application(run.getIdeName().get(), project);
+        var appRun = new ExtendedApplication(run.getIdeName().get(), project, getExtraIntelijRunProperties(run));
         var sourceSets = ExtensionUtils.getSourceSets(project);
         var sourceSet = run.getSourceSet().get();
         // Validate that the source set is part of this project
@@ -269,4 +270,29 @@ private static String getIntellijModuleName(Project project, SourceSet sourceSet
         moduleName.append(sourceSet.getName());
         return moduleName.toString();
     }
+
+    private static Map<String, Object> getExtraIntelijRunProperties(RunModel run) {
+        var extraProperties = new HashMap<String, Object>();
+        if (!run.getIdeFolderName().get().isEmpty()) {
+            extraProperties.put("folderName", run.getIdeFolderName().get());
+        }
+        return extraProperties;
+    }
+
+    private static class ExtendedApplication extends Application {
+        private final Map<String, Object> extraProperties;
+
+        public ExtendedApplication(String name, Project project, Map<String, Object> extraProperties) {
+            super(name, project);
+            this.extraProperties = extraProperties;
+        }
+
+        @Override
+        public Map<String, ?> toMap() {
+            @SuppressWarnings("unchecked")
+            var m = (Map<String, Object>) super.toMap();
+            m.putAll(extraProperties);
+            return m;
+        }
+    }
 }

testproject/build.gradle

@@ -56,6 +56,10 @@ neoForge {
             client()
             programArguments.addAll('--username', 'Dev2')
         }
+        folderedClient {
+            client()
+            ideFolderName = "Neo Test Folder"
+        }
         clientAuth {
             client()
             devLogin = true