Add support for renaming files

Fixes #293.

Author: kevva

Gruntfile.js

@@ -33,6 +33,11 @@ module.exports = function (grunt) {
           src: '**/*.{gif,GIF,jpg,JPG,png,PNG}',
           dest: 'tmp'
         }]
+      },
+      rename: {
+        files: {
+          'tmp/rename.jpg': 'test/fixtures/test.jpg'
+        }
       }
     },
     nodeunit: {

package.json

@@ -22,6 +22,7 @@
   "dependencies": {
     "async": "^0.9.0",
     "chalk": "^1.0.0",
+    "gulp-rename": "^1.2.0",
     "imagemin": "^3.1.0",
     "pretty-bytes": "^1.0.1"
   },

tasks/imagemin.js

@@ -6,6 +6,7 @@ var async = require('async');
 var chalk = require('chalk');
 var prettyBytes = require('pretty-bytes');
 var Imagemin = require('imagemin');
+var rename = require('gulp-rename');
 
 /*
  * grunt-contrib-imagemin
@@ -40,6 +41,10 @@ module.exports = function (grunt) {
                 options.use.forEach(imagemin.use.bind(imagemin));
             }
 
+            if (path.basename(file.src[0]) !== path.basename(file.dest)) {
+                imagemin.use(rename(path.basename(file.dest)));
+            }
+
             fs.stat(file.src[0], function (err, stats) {
                 if (err) {
                     grunt.warn(err + ' in file ' + file.src[0]);

test/test.js

@@ -62,6 +62,13 @@ exports.imagemin = {
 
         test.ok(fs.existsSync('tmp/nested/nested/test.png'), 'should support nested dest dir');
 
+        test.done();
+    },
+    rename: function (test) {
+        test.expect(1);
+
+        test.ok(fs.existsSync('tmp/rename.jpg'), 'should support renaming');
+
         test.done();
     }
 };