use only grunt to insert cdnurl

Gruntfile.js

@@ -6,13 +6,13 @@ module.exports = function(grunt){
         src: '_src',
         site: '_site',
         build: '_build',
+        cdnurl: 'https://d2jlreog722xe2.cloudfront.net',
         assets: {
             stylus: 'assets/styl',
             css:    'assets/css',
             js:     'assets/js',
             img:    'assets/img',
-            fonts:  'assets/fonts',
-            cdnurl: 'https://d2jlreog722xe2.cloudfront.net/assets/'
+            fonts:  'assets/fonts'
         }
     };
 
@@ -51,8 +51,7 @@ module.exports = function(grunt){
             },
             production: {
                 options: {
-                    lsi: true,
-                    raw: 'enable_cdnurl: true\n'
+                    lsi: true
                 }
             },
             development: {
@@ -207,15 +206,30 @@ module.exports = function(grunt){
             }
         },
 
-        // CDN some assets
-        cdn: {
-            options: {
-                cdn: '<%= config.assets.cdnurl %>',
-                flatten: true
+        // insert CDN url by replacing text strings
+        replace: {
+            html: {
+                src: ['<%= config.build %>/**/*.html'],
+                overwrite: true,
+                replacements: [
+                    {
+                        from: '/assets/js/',
+                        to: '<%= config.cdnurl %>/assets/js/'
                     },
-            dist: {
-                src: [
-                    '<%= config.build %>/assets/**/*.css' // CDN all assets called from css files
+                    {
+                        from: '/media/',
+                        to: '<%= config.cdnurl %>/media/'
+                    }
+                ]
+            },
+            css: {
+                src: ['<%= config.build %>/<%= config.assets.css %>/*.css'],
+                overwrite: true,
+                replacements: [
+                    {
+                        from: '../',
+                        to: '<%= config.cdnurl %>/assets/'
+                    }
                 ]
             }
         },
@@ -303,7 +317,7 @@ module.exports = function(grunt){
         'rsync:copy_build',
         'rev',
         'usemin',
-        'cdn'
+        'replace'
     ]);
 
     // Optimze media

_config.yml

@@ -15,8 +15,6 @@ description:            'Blog of designer & developer Matthias Kretschmann'
 url:                    https://kremalicious.com
 author:                 Matthias Kretschmann
 email:                  m@kretschmann.io
-cdnurl:                 https://d2jlreog722xe2.cloudfront.net
-enable_cdnurl:          false
 
 
 # Urls

_src/_plugins/picture_tag.rb

@@ -142,7 +142,7 @@ module Jekyll
 
       # Generate resized images
       instance.each { |key, source|
-        instance[key][:generated_src] = generate_image(source, site.source, site.dest, settings['source'], settings['output'], site.config['cdnurl'], site.config["baseurl"], site.config['enable_cdnurl'])
+        instance[key][:generated_src] = generate_image(source, site.source, site.dest, settings['source'], settings['output'], site.config["baseurl"])
       }
 
       # Construct and return tag
@@ -169,7 +169,7 @@ module Jekyll
         picture_tag
     end
 
-    def generate_image(instance, site_source, site_dest, image_source, image_dest, cdnurl, baseurl, enable_cdnurl)
+    def generate_image(instance, site_source, site_dest, image_source, image_dest, baseurl)
       image = MiniMagick::Image.open(File.join(site_source, image_source, instance[:src]))
       digest = Digest::MD5.hexdigest(image.to_blob).slice!(0..5)
 
@@ -230,11 +230,7 @@ module Jekyll
       end
 
       # Return path relative to the site root for html
-      if enable_cdnurl == true
-        Pathname.new(File.join(cdnurl, baseurl, image_dest, image_dir, gen_name))
-      else
       Pathname.new(File.join(baseurl, image_dest, image_dir, gen_name)).cleanpath
-      end
 
     end
   end

package.json

@@ -10,7 +10,6 @@
   "dependencies": {},
   "devDependencies": {
     "grunt": ">=0.4.5",
-    "grunt-cdn": ">=0.5.6",
     "grunt-combine-media-queries": ">=1.0.8",
     "grunt-contrib-clean": ">=0.5.0",
     "grunt-contrib-connect": ">=0.5.0",
@@ -22,6 +21,7 @@
     "grunt-jekyll": ">=0.4.0",
     "grunt-rev": ">=0.1.0",
     "grunt-rsync": ">=0.2.1",
+    "grunt-text-replace": ">=0.3.12",
     "grunt-usemin": ">=2.0.2",
     "nib": ">=1.0.3",
     "stylus": ">=0.45.0"