Adds support for LESS css

This support behaves very similar to the SASS support. It will attempt
to compile the css prior to checking for redundancies.

For c-versions of ruby, therubyracer is required. For jruby,
therubyrhino.

More information can be found at http://lesscss.org/

refs: zmoazeni#52, zmoazeni#10

Author: zmoazeni

CHANGELOG.md

@@ -3,6 +3,7 @@
 * 0 and 0px are now reconciled as redundancies
 * Disables color support by default for windows & ruby < 2.0
 * Fixes bug where unquoted url(data...) isn't parsed correctly
+* Adds support for LESS files
 
 ## 1.1.0 - 4/12/2013 ##
 

CONTRIBUTORS.md

@@ -3,3 +3,4 @@
 * Martin Kuckert @MKuckert
 * Ivan Lazarevic @kopipejst
 * Matt DuVall @mduvall twitter:@mduvall_
+* Mekka Okereke @mekka @mekkaokereke

Gemfile

@@ -6,6 +6,8 @@ gemspec
 # optional runtime dependencies
 gem "sass"
 gem "compass"
+gem "less"
+gem "therubyracer", :platform => :mri
 
 gem "rake", :require => false
 gem "debugger"

Gemfile.lock

@@ -12,6 +12,7 @@ GEM
     chunky_png (1.2.7)
     colorize (0.5.8)
     columnize (0.3.6)
+    commonjs (0.2.6)
     compass (0.12.2)
       chunky_png (~> 1.2)
       fssm (>= 0.2.7)
@@ -23,6 +24,9 @@ GEM
     debugger-linecache (1.2.0)
     debugger-ruby_core_source (1.2.0)
     fssm (0.2.10)
+    less (2.3.1)
+      commonjs (~> 0.2.6)
+    libv8 (3.11.8.17)
     m (1.3.1)
       method_source (>= 0.6.7)
       rake (>= 0.9.2.2)
@@ -32,8 +36,12 @@ GEM
     parslet (1.5.0)
       blankslate (~> 2.0)
     rake (10.0.3)
+    ref (1.0.4)
     ruby-prof (0.13.0)
     sass (3.2.7)
+    therubyracer (0.11.4)
+      libv8 (~> 3.11.8.12)
+      ref
 
 PLATFORMS
   ruby
@@ -42,9 +50,11 @@ DEPENDENCIES
   compass
   csscss!
   debugger
+  less
   m
   minitest
   minitest-rg
   rake
   ruby-prof
   sass
+  therubyracer

README.md

@@ -45,11 +45,20 @@ rulesets that have fewer matches.
 
     $ csscss -n 10 -v path/to/style.css # ignores rulesets with < 10 matches
 
-If you prefer writing in sass, you can also parse your sass/scss files.
+If you prefer writing in [sass](http://sass-lang.com/), you can also parse your sass/scss files.
 
     $ gem install sass
     $ csscss path/to/style.scss
 
+If you prefer writing in [LESS](http://lesscss.org/), you can also parse your LESS files.
+
+    $ gem install less
+    $ csscss path/to/style.less
+
+LESS requires an additional javascript runtime.
+[v8/therubyracer](https://rubygems.org/gems/therubyracer) on most
+rubies, and [therubyrhino](https://rubygems.org/gems/therubyrhino) on
+jruby.
 
 ## I found bugs ##
 

lib/csscss/cli.rb

@@ -8,39 +8,30 @@ def initialize(argv)
       @compass            = false
       @ignored_properties = []
       @ignored_selectors  = []
-      @match_shorthand   = true
+      @match_shorthand    = true
     end
 
     def run
       parse(@argv)
       execute
     end
 
+    private
     def execute
       warn_old_debug_flag if ENV["CSSCSS_DEBUG"]
 
-      all_contents = @argv.map do |filename|
-        if %w(.scss .sass).include?(File.extname(filename).downcase) && !(filename =~ URI.regexp)
-          begin
-            require "sass"
-          rescue LoadError
-            abort "Must install sass gem before parsing sass/scss files"
-          end
-
-          sass_options = {cache:false}
-          sass_options[:load_paths] = Compass.configuration.sass_load_paths if @compass
-          begin
-            Sass::Engine.for_file(filename, sass_options).render
-          rescue Sass::SyntaxError => e
-            if e.message =~ /compass/ && !@compass
-              puts "Enable --compass option to use compass's extensions"
-              exit 1
-            else
-              raise e
-            end
-          end
+      all_contents= @argv.map do |filename|
+        if filename =~ URI.regexp
+          load_css_file(filename)
         else
-          open(filename) {|f| f.read }
+          case File.extname(filename).downcase
+          when ".scss", ".sass"
+            load_sass_file(filename)
+          when ".less"
+            load_less_file(filename)
+          else
+            load_css_file(filename)
+          end
         end
       end.join("\n")
 
@@ -133,7 +124,6 @@ def parse(argv)
       print_help(opts)
     end
 
-    private
     def print_help(opts)
       puts opts
       exit
@@ -159,6 +149,47 @@ def windows_1_9
       RbConfig::CONFIG['host_os'] =~ /mswin|mingw|cygwin/ && RUBY_VERSION =~ /^1\.9/
     end
 
+    def gem_installed?(gem_name)
+      begin
+        require gem_name
+        true
+      rescue LoadError
+        false
+      end
+    end
+
+    def load_sass_file(filename)
+      if !gem_installed?("sass") then
+        abort 'Must install the "sass" gem before parsing sass/scss files'
+      end
+
+      sass_options = {cache:false}
+      sass_options[:load_paths] = Compass.configuration.sass_load_paths if @compass
+      begin
+        Sass::Engine.for_file(filename, sass_options).render
+      rescue Sass::SyntaxError => e
+        if e.message =~ /compass/ && !@compass
+          puts "Enable --compass option to use compass's extensions"
+          exit 1
+        else
+          raise e
+        end
+      end
+    end
+
+    def load_less_file(filename)
+      if !gem_installed?("less") then
+        abort 'Must install the "less" gem before parsing less files'
+      end
+
+      contents = load_css_file(filename)
+      Less::Parser.new.parse(contents).to_css
+    end
+
+    def load_css_file(filename)
+      open(filename) {|f| f.read }
+    end
+
     class << self
       def run(argv)
         new(argv).run