Changed GroocssTask to extend AbstractCopyTask

groocss-gradle-plugin/src/main/groovy/org/groocss/GroocssTask.groovy

@@ -1,21 +1,54 @@
 package org.groocss
 
-import org.gradle.api.DefaultTask
-import org.gradle.api.tasks.TaskAction
+import org.gradle.api.internal.file.CopyActionProcessingStreamAction
+import org.gradle.api.internal.file.FileResolver
+import org.gradle.api.internal.file.copy.CopyAction
+import org.gradle.api.internal.file.copy.CopyActionProcessingStream
+import org.gradle.api.internal.file.copy.FileCopyDetailsInternal
+import org.gradle.api.internal.tasks.SimpleWorkResult
+import org.gradle.api.tasks.AbstractCopyTask
+import org.gradle.api.tasks.WorkResult
 
-class GroocssTask extends DefaultTask {
+/** Converts GrooCSS files using the same features as the Copy task. */
+class GroocssTask extends AbstractCopyTask {
 
     Config conf
-    File inFile
-    File outFile
 
-    /** Converts the given GrooCSS file with current config, and outputs to given file. */
-    @TaskAction
-    def convert() {
-        if (!conf) {
-            conf = new Config()
+    @Override
+    protected CopyAction createCopyAction() {
+        return new CopyAction() {
+            @Override
+            WorkResult execute(CopyActionProcessingStream stream) {
+                if (!conf) {
+                    conf = new Config()
+                }
+                def action = new GroocssFileAction(fileResolver, conf)
+                stream.process(action)
+                return new SimpleWorkResult(action.didWork)
+            }
         }
-        GrooCSS.convert(conf, inFile, outFile)
     }
 
+    /** Converts the given GrooCSS file with current config, and outputs to given file. */
+    static class GroocssFileAction implements CopyActionProcessingStreamAction {
+        FileResolver fileResolver
+        Config config
+        boolean didWork
+
+        GroocssFileAction(FileResolver fileResolver, Config config) {
+            this.fileResolver = fileResolver
+            this.config = config
+        }
+
+        @Override
+        void processFile(FileCopyDetailsInternal details) {
+            File source = fileResolver.resolve(details.relativeSourcePath.pathString)
+            File target = fileResolver.resolve(details.relativePath.pathString)
+
+            if (source.isFile() || source.isDirectory()) {
+                GrooCSS.convert(config, source, target)
+                didWork = true
+            }
+        }
+    }
 }