Add less filter

hamlit.gemspec

@@ -26,11 +26,13 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency "erubis"
   spec.add_development_dependency "faml"
   spec.add_development_dependency "haml"
+  spec.add_development_dependency "less"
   spec.add_development_dependency "pry"
   spec.add_development_dependency "rake"
   spec.add_development_dependency "rspec", ">= 3"
   spec.add_development_dependency "sass"
   spec.add_development_dependency "slim"
   spec.add_development_dependency "tenjin"
+  spec.add_development_dependency "therubyracer"
   spec.add_development_dependency "unindent"
 end

lib/hamlit/compilers/filter.rb

@@ -3,6 +3,7 @@ require 'hamlit/concerns/registerable'
 require 'hamlit/filters/css'
 require 'hamlit/filters/escaped'
 require 'hamlit/filters/javascript'
+require 'hamlit/filters/less'
 require 'hamlit/filters/plain'
 require 'hamlit/filters/preserve'
 require 'hamlit/filters/ruby'
@@ -22,6 +23,7 @@ module Hamlit
         register :css,        Filters::Css
         register :escaped,    Filters::Escaped
         register :javascript, Filters::Javascript
+        register :less,       Filters::Less
         register :plain,      Filters::Plain
         register :preserve,   Filters::Preserve
         register :ruby,       Filters::Ruby

lib/hamlit/filters/less.rb

@@ -0,0 +1,12 @@
+require 'hamlit/filters/tilt'
+
+module Hamlit
+  module Filters
+    class Less < Filters::Tilt
+      def compile(lines)
+        ast = [:html, :tag, 'style', [:html, :attrs]]
+        compile_with_tilt('less', lines.join("\n"), ast)
+      end
+    end
+  end
+end

spec/hamlit/filters/less_spec.rb

@@ -0,0 +1,22 @@
+describe Hamlit::Filters::Less do
+  describe '#compile' do
+    it 'renders less filter' do
+      assert_render(<<-HAML, <<-HTML)
+        :less
+          .users_controller {
+            .show_action {
+              margin: 10px;
+              padding: 20px;
+            }
+          }
+      HAML
+        <style>
+          .users_controller .show_action {
+            margin: 10px;
+            padding: 20px;
+          }
+        </style>
+      HTML
+    end
+  end
+end