Accept list of paths to exclude from gzipping.

middleman-core/features/gzip.feature

@@ -34,3 +34,19 @@ Feature: GZIP assets during build
       | build/stylesheets/test.css |
     And the following files should not exist:
       | build/stylesheets/test.css.gz |
+
+  Scenario: Gzipped files are not produced for ignored paths
+    Given a fixture app "gzip-app"
+    And a file named "config.rb" with:
+      """
+      activate :gzip, ignore: ['index.html', %r(javascripts/.*)]
+      """
+    And a successfully built app at "gzip-app"
+    Then the following files should exist:
+      | build/index.html |
+      | build/javascripts/test.js |
+      | build/stylesheets/test.css |
+      | build/stylesheets/test.css.gz |
+    And the following files should not exist:
+      | build/index.html.gz |
+      | build/javascripts/test.js.gz |

middleman-core/lib/middleman-more/extensions/gzip.rb

@@ -11,6 +11,7 @@
 #
 class Middleman::Extensions::Gzip < ::Middleman::Extension
   option :exts, %w(.js .css .html .htm), 'File extensions to Gzip when building.'
+  option :ignore, [], 'Patterns to avoid gzipping'
 
   def initialize(app, options_hash={})
     super
@@ -29,7 +30,7 @@ class Middleman::Extensions::Gzip < ::Middleman::Extension
     # Fill a queue with inputs
     in_queue = Queue.new
     paths.each do |path|
-      in_queue << path if options.exts.include?(path.extname)
+      in_queue << path if should_gzip?(path)
     end
     num_paths = in_queue.size
 
@@ -93,4 +94,13 @@ class Middleman::Extensions::Gzip < ::Middleman::Extension
 
     [output_filename, old_size, new_size]
   end
+
+  private
+
+  # Whether a path should be gzipped
+  # @param [Pathname] path A destination path
+  # @return [Boolean]
+  def should_gzip?(path)
+    options.exts.include?(path.extname) && options.ignore.none? { |ignore| Middleman::Util.path_match(ignore, path.to_s) }
+  end
 end