system-wide css compression using Sprockets and CSSMin. fixes #102

lib/middleman/core_extensions/sprockets.rb

@@ -6,6 +6,7 @@ module Middleman::CoreExtensions::Sprockets
   class << self
     def registered(app)
       app.set :js_compressor, false
+      app.set :css_compressor, false
       
       # Cut off every extension after .js (which sprockets eats up)
       app.build_reroute do |destination, request_path|
@@ -78,7 +79,7 @@ module Middleman::CoreExtensions::Sprockets
       super
 
       # Disable css
-      unregister_processor "text/css", ::Sprockets::DirectiveProcessor
+      # unregister_processor "text/css", ::Sprockets::DirectiveProcessor
       
       self.js_compressor = app.settings.js_compressor
 
@@ -97,7 +98,9 @@ module Middleman::CoreExtensions::Sprockets
       super
   
       # Disable js
-      unregister_processor "application/javascript", ::Sprockets::DirectiveProcessor
+      # unregister_processor "application/javascript", ::Sprockets::DirectiveProcessor
+      
+      self.css_compressor = app.settings.css_compressor
   
       # configure search paths
       append_path app.css_dir

lib/middleman/features/minify_css.rb

@@ -1,9 +1,8 @@
 module Middleman::Features::MinifyCss
   class << self
     def registered(app)
-      app.compass_config do |config|
+      require "middleman/features/minify_css/cssmin"
-        config.output_style = :compressed
+      app.set :css_compressor, ::CSSMin
-      end
     end
     alias :included :registered
   end

lib/middleman/features/minify_css/cssmin.rb

@@ -0,0 +1,55 @@
+#--
+# Copyright (c) 2008 Ryan Grove <ryan@wonko.com>
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are met:
+#
+#   * Redistributions of source code must retain the above copyright notice,
+#     this list of conditions and the following disclaimer.
+#   * Redistributions in binary form must reproduce the above copyright notice,
+#     this list of conditions and the following disclaimer in the documentation
+#     and/or other materials provided with the distribution.
+#   * Neither the name of this project nor the names of its contributors may be
+#     used to endorse or promote products derived from this software without
+#     specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
+# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+#++
+
+module CSSMin
+  def self.compress(input)
+    css = input.is_a?(IO) ? input.read : input.dup.to_s
+    css.gsub!(/\/\*[\s\S]*?\*\//, '')
+    css.gsub!(/\s+/, ' ')
+    css.gsub!(/"\\"\}\\""/, '___BMH___')
+    css.gsub!(/(?:^|\})[^\{:]+\s+:+[^\{]*\{/) do |match|
+      match.gsub(':', '___PSEUDOCLASSCOLON___')
+    end
+    css.gsub!(/\s+([!\{\};:>+\(\)\],])/, '\1')
+    css.gsub!('___PSEUDOCLASSCOLON___', ':')
+    css.gsub!(/([!\{\}:;>+\(\[,])\s+/, '\1')
+    css.gsub!(/([^;\}])\}/, '\1;}')
+    css.gsub!(/([\s:])([+-]?0)(?:%|em|ex|px|in|cm|mm|pt|pc)/i, '\1\2')
+    css.gsub!(/:(?:0 )+0;/, ':0;')
+    css.gsub!('background-position:0;', 'background-position:0 0;')
+    css.gsub!(/(:|\s)0+\.(\d+)/, '\1.\2')
+    css.gsub!(/rgb\s*\(\s*([0-9,\s]+)\s*\)/) do |match|
+      '#' << $1.scan(/\d+/).map{|n| n.to_i.to_s(16).rjust(2, '0') }.join
+    end
+    css.gsub!(/([^"'=\s])\s*#([0-9a-f])\2([0-9a-f])\3([0-9a-f])\4/i, '\1 #\2\3\4')
+    css.gsub!(/[^\}]+\{;\}\n/, '')
+    css.gsub!('___BMH___', '"\"}\""')
+    css.gsub!(/;;+/, ';')
+    css.strip
+  end
+end