Add proc as a means of defining a rewriter ignore. Closes #1289

middleman-core/features/asset_hash.feature

@@ -109,7 +109,12 @@ Feature: Assets get a file hash appended to their and references to them are upd
     Given a fixture app "asset-hash-app"
     And a file named "config.rb" with:
       """
-      activate :asset_hash, ignore: [%r(javascripts/*), 'images/*']
+      is_stylesheet = proc { |path| path.start_with? 'stylesheets' }
+      activate :asset_hash, ignore: [
+        %r(javascripts/*),
+        'images/*',
+        is_stylesheet
+      ]
       activate :relative_assets
       activate :directory_indexes
       """
@@ -123,7 +128,7 @@ Feature: Assets get a file hash appended to their and references to them are upd
       | images/100px.jpg |
       | images/100px.gif |
       | javascripts/application.js |
-      | stylesheets/site-50eaa978.css |
+      | stylesheets/site.css |
       | index.html |
       | subdir/index.html |
       | other/index.html |
@@ -132,7 +137,7 @@ Feature: Assets get a file hash appended to their and references to them are upd
       | images/100px-5fd6fb90.jpg |
       | images/100px-5fd6fb90.gif |
       | javascripts/application-1d8d5276.js |
-      | stylesheets/site.css |
+      | stylesheets/site-50eaa978.css |
 
   # @wip Currently broken, we should move all asset-host functionality out of Compass and into something more similar to asset_hash with Rack-based rewrites
   # Scenario: Enabling an asset host and referencing assets in CSS with URL fragments are rewritten correctly

middleman-core/lib/middleman-core/middleware/inline_url_rewriter.rb

@@ -49,7 +49,7 @@ module Middleman
                 asset_path
               end
 
-              @ignore.none? { |r| full_asset_path.match(r) } && @proc.call(asset_path, dirpath)
+              @ignore.none? { |r| should_ignore?(r, full_asset_path) } && @proc.call(asset_path, dirpath)
             end
 
             status, headers, response = ::Rack::Response.new(
@@ -62,6 +62,21 @@ module Middleman
 
         [status, headers, response]
       end
+
+      def should_ignore?(validator, value)
+        if validator.is_a? Regexp
+          # Treat as Regexp
+          value.match(validator)
+        elsif validator.respond_to? :call
+          # Treat as proc
+          validator.call(value)
+        elsif validator.is_a? String
+          # Treat as glob
+          File.fnmatch(value, validator)
+        else
+          # If some unknown thing, don't ignore
+        end
+      end
     end
   end
 end