IDEA-122235 Detect groovy scripts from the hashbang line

plugins/groovy/src/META-INF/plugin.xml

@@ -217,6 +217,9 @@
   <extensions defaultExtensionNs="com.intellij">
     <navbar implementation="org.jetbrains.plugins.groovy.navbar.GrNavBarModelExtension" order="after defaultNavbar"/>
 
+    <fileTypeDetector implementation="org.jetbrains.plugins.groovy.GroovyHashBangFileTypeDetector"/>
+
+
     <declarationRangeHandler key="org.jetbrains.plugins.groovy.lang.psi.api.statements.typedef.members.GrMethod"
                              implementationClass="org.jetbrains.plugins.groovy.codeInsight.hint.GrMethodDeclarationRangeHandler"/>
     <declarationRangeHandler key="org.jetbrains.plugins.groovy.lang.psi.api.statements.typedef.GrTypeDefinition"

plugins/groovy/src/org/jetbrains/plugins/groovy/GroovyHashBangFileTypeDetector.java

@@ -0,0 +1,39 @@
+/*
+ * Copyright 2000-2014 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jetbrains.plugins.groovy;
+
+import com.intellij.openapi.fileTypes.FileType;
+import com.intellij.openapi.fileTypes.FileTypeRegistry;
+import com.intellij.openapi.util.io.ByteSequence;
+import com.intellij.openapi.util.io.FileUtil;
+import com.intellij.openapi.vfs.VirtualFile;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+/**
+ * Created by Max Medvedev on 17/03/14
+ */
+public class GroovyHashBangFileTypeDetector implements FileTypeRegistry.FileTypeDetector {
+  @Nullable
+  @Override
+  public FileType detect(@NotNull VirtualFile file, @NotNull ByteSequence firstBytes, @Nullable CharSequence firstCharsIfText) {
+    if (FileUtil.isHashBangLine(firstCharsIfText, "groovy")) {
+      return GroovyFileType.GROOVY_FILE_TYPE;
+    }
+
+    return null;
+  }
+}