hide Groovy run configuration if there are no groovy files in project (IDEA-116046)

platform/indexing-impl/src/com/intellij/psi/search/FileTypeIndex.java

@@ -103,4 +103,13 @@ public class FileTypeIndex extends ScalarIndexExtension<FileType>
   public Map<FileType, Void> map(FileContent inputData) {
     return Collections.singletonMap(inputData.getFileType(), null);
   }
+
+  public static boolean containsFileOfType(@NotNull FileType type, @NotNull GlobalSearchScope scope) {
+    return !FileBasedIndex.getInstance().processValues(NAME, type, null, new FileBasedIndex.ValueProcessor<Void>() {
+      @Override
+      public boolean process(VirtualFile file, Void value) {
+        return false;
+      }
+    }, scope);
+  }
 }

plugins/groovy/src/org/jetbrains/plugins/groovy/runner/GroovyScriptRunConfigurationType.java

@@ -21,9 +21,12 @@ import com.intellij.execution.configurations.ConfigurationType;
 import com.intellij.execution.configurations.ConfigurationTypeUtil;
 import com.intellij.execution.configurations.RunConfiguration;
 import com.intellij.openapi.project.Project;
+import com.intellij.psi.search.FileTypeIndex;
+import com.intellij.psi.search.GlobalSearchScope;
 import icons.JetgroovyIcons;
 import org.jetbrains.annotations.NonNls;
 import org.jetbrains.annotations.NotNull;
+import org.jetbrains.plugins.groovy.GroovyFileType;
 
 import javax.swing.*;
 
@@ -65,6 +68,11 @@ public class GroovyScriptRunConfigurationType implements ConfigurationType {
       super(type);
     }
 
+    @Override
+    public boolean isApplicable(@NotNull Project project) {
+      return FileTypeIndex.containsFileOfType(GroovyFileType.GROOVY_FILE_TYPE, GlobalSearchScope.allScope(project));
+    }
+
     public RunConfiguration createTemplateConfiguration(Project project) {
       return new GroovyScriptRunConfiguration("Groovy Script", project, this);
     }