feat(task): add option autoOrient

Gruntfile.js

@@ -118,6 +118,16 @@ module.exports = function(grunt) {
           {'tmp/quality.jpg': 'test/fixtures/quality.jpg'}
         ]
       },
+      autoOrient: {
+        options: {
+          autoOrient: true,
+          width: 100,
+          height: 100
+        },
+        files: [
+          {'tmp/rotate.jpg': 'test/fixtures/rotate.jpg'}
+        ]
+      },
       all: {
         options: {
           width: 100,

README.md

@@ -114,6 +114,12 @@ Default value: `1`
 
 Determines the output quality of the resized image. Ranges from `0` (really bad) to `1` (almost lossless). Only applies to jpg images.
 
+#### options.autoOrient
+Type: `Boolean`
+Default value: `false`
+
+Determines if resized image will be rotated according to EXIF information. Only applies to jpg images.
+
 ### Usage Examples
 
 #### Default Options

tasks/image_resize.js

@@ -28,7 +28,8 @@ module.exports = function(grunt) {
       concurrency: os.cpus().length,
       crop: false,
       gravity: 'Center',
-      quality: 1
+      quality: 1,
+      autoOrient: false
     });
     var series = [];
 
@@ -52,7 +53,8 @@ module.exports = function(grunt) {
           dstPath:  (list.dest[list.dest.length-1] !== '/') ? list.dest : path.join(dirname, path.basename(filepath)) ,
           width:    options.width,
           height:   options.height,
-          quality:  options.quality
+          quality:  options.quality,
+          autoOrient: options.autoOrient
         };
 
         // Prevent failing if destination directory does not exist.
@@ -89,6 +91,10 @@ module.exports = function(grunt) {
                   .resize(imOptions.width, imOptions.height);
               }
 
+              if (options.autoOrient) {
+                resizer.autoOrient();
+              }
+
               resizer
                 .quality(Math.floor(imOptions.quality * 100))
                 .write(imOptions.dstPath, function(err) {

test/image_resize_test.js

@@ -97,8 +97,13 @@ exports.image_resize = {
       }
     ], test.done);
   },
+  autoOrient: function(test) {
+    test.expect(3);
+
+    createTest(test, "rotate.jpg")(test.done);
+  },
   all: function(test) {
-    test.expect(27);
+    test.expect(30);
 
     async.series([
       createTest(test, "directory/crop.png"),
@@ -109,6 +114,7 @@ exports.image_resize = {
       createTest(test, "directory/TeslaTurbine.png"),
       createTest(test, "directory/upscale2.png"),
       createTest(test, "directory/upscale.png"),
+      createTest(test, "directory/rotate.jpg"),
       createTest(test, "directory/wikipedia.png")
     ], test.done);
   }