rotate resized images based on exif info

EXIF rotation information embedded by the capture device is now
respected when generating output images. Original images remain
untouched.

.gitattributes

@@ -0,0 +1 @@
+features/test-site/* linguist-vendored

README.md

@@ -46,6 +46,11 @@ responsive_image:
     - width: 800
     - width: 1400
       quality: 90
+  
+  # [Optional, Default: false]
+  # Rotate resized images depending on their EXIF rotation attribute. Useful for
+  # working with JPGs directly from digital cameras and smartphones
+  respect_exif_rotation: false
 
   # [Optional, Default: assets]
   # The base directory where assets are stored. This is used to determine the
@@ -128,7 +133,23 @@ You will need to create a template in order to use the `responsive_image` tag. B
     {% endfor %}
 {% endcapture %}
 
-<img src="/{{ path }}" alt="{{ alt }}" srcset="{{ srcset | strip_newlines }} /{{ original.path }} {{ original.width }}w">
+<img src="/{{ path }}" alt="{{ alt }}" srcset="{{ srcset | strip_newlines }}">
+```
+
+#### Responsive image with `srcset` where the largest resized image is the default
+
+> **Note:** This is useful if you don't want your originals to appear on your site. For example, if you're uploading full-res images directly from a device.
+ 
+```twig
+{% capture srcset %}
+    {% for i in resized %}
+        /{{ i.path }} {{ i.width }}w,
+    {% endfor %}
+{% endcapture %}
+
+{% assign largest = resized | sort: 'width' | last %}
+
+<img src="/{{ largest.path }}" alt="{{ alt }}" srcset="{{ srcset | strip_newlines }}">
 ```
 
 #### Responsive images with `<picture>`

lib/jekyll-responsive-image/config.rb

@@ -2,11 +2,12 @@ module Jekyll
   module ResponsiveImage
     class Config
       DEFAULTS = {
-        'default_quality'    => 85,
+        'default_quality'       => 85,
-        'base_path'          => 'assets',
+        'base_path'             => 'assets',
-        'output_path_format' => 'assets/resized/%{filename}-%{width}x%{height}.%{extension}',
+        'output_path_format'    => 'assets/resized/%{filename}-%{width}x%{height}.%{extension}',
-        'sizes'              => [],
+        'sizes'                 => [],
-        'extra_images'       => []
+        'extra_images'          => [],
+        'respect_exif_rotation' => false
       }
 
       def initialize(site)

lib/jekyll-responsive-image/resize_handler.rb

@@ -4,6 +4,7 @@ module Jekyll
       include ResponsiveImage::Utils
 
       def resize_image(img, config)
+        img.auto_orient! if config['respect_exif_rotation']
         resized = []
 
         config['sizes'].each do |size|

lib/jekyll-responsive-image/version.rb

@@ -1,5 +1,5 @@
 module Jekyll
   module ResponsiveImage
-    VERSION = '1.1.0'.freeze
+    VERSION = '1.1.1'.freeze
   end
 end