DevTools: introduce WI.UISourceCode.requestMetadata()

third_party/WebKit/Source/devtools/front_end/bindings/FileSystemWorkspaceBinding.js

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 189 matching lines @@
     var id = WebInspector.FileSystemWorkspaceBinding.projectId(this._fileSystemPath);
     console.assert(!workspace.project(id));
 
     var displayName = this._fileSystemPath.substr(this._fileSystemPath.lastIndexOf("/") + 1);
     WebInspector.ProjectStore.call(this, workspace, id, WebInspector.projectTypes.FileSystem, displayName);
 
     workspace.addProject(this);
     this.populate();
 }
 
+WebInspector.FileSystemWorkspaceBinding._metadata = Symbol("FileSystemWorkspaceBinding.Metadata");
+
 WebInspector.FileSystemWorkspaceBinding.FileSystem.prototype = {
     /**
      * @return {string}
      */
     fileSystemPath: function()
     {
         return this._fileSystemPath;
     },
 
     /**
      * @param {!WebInspector.UISourceCode} uiSourceCode
      * @return {string}
      */
     _filePathForUISourceCode: function(uiSourceCode)
     {
         return uiSourceCode.url().substring(this._fileSystemPath.length);
     },
 
     /**
      * @override
      * @param {!WebInspector.UISourceCode} uiSourceCode
+     * @return {!Promise<?WebInspector.UISourceCodeMetadata>}
+     */
+    requestMetadata: function(uiSourceCode)
+    {
+        if (uiSourceCode[WebInspector.FileSystemWorkspaceBinding._metadata])
+            return uiSourceCode[WebInspector.FileSystemWorkspaceBinding._metadata];
+        var relativePath = this._filePathForUISourceCode(uiSourceCode);
+        var promise = this._fileSystem.getMetadata(relativePath).then(onMetadata);
+        uiSourceCode[WebInspector.FileSystemWorkspaceBinding._metadata] = promise;
+        return promise;
+
+        /**
+         * @param {?{modificationTime: !Date, size: number}} metadata
+         * @return {?WebInspector.UISourceCodeMetadata}
+         */
+        function onMetadata(metadata)
+        {
+            if (!metadata)
+                return null;
+            return new WebInspector.UISourceCodeMetadata(metadata.modificationTime, metadata.size);
+        }
+    },
+
+    /**
+     * @override
+     * @param {!WebInspector.UISourceCode} uiSourceCode
      * @param {function(?string)} callback
      */
     requestFileContent: function(uiSourceCode, callback)
     {
         var filePath = this._filePathForUISourceCode(uiSourceCode);
         var isImage = WebInspector.FileSystemWorkspaceBinding._imageExtensions.has(WebInspector.ParsedURL.extractExtension(filePath));
 
         this._fileSystem.requestFileContent(filePath, isImage ? base64CallbackWrapper : callback);
 
         /**
@@ skipping 285 matching lines @@
      * @param {string} path
      */
     _fileChanged: function(path)
     {
         var uiSourceCode = this.uiSourceCodeForURL(path);
         if (!uiSourceCode) {
             var contentType = WebInspector.FileSystemWorkspaceBinding._contentTypeForExtension(this._extensionForPath(path));
             this.addUISourceCode(this.createUISourceCode(path, contentType));
             return;
         }
+        uiSourceCode[WebInspector.FileSystemWorkspaceBinding._metadata] = null;
         uiSourceCode.checkContentUpdated();
     },
 
     dispose: function()
     {
         this.removeProject();
     },
 
     __proto__: WebInspector.ProjectStore.prototype
 }