Integrate with tilt and add sass filter

.gitignore

@@ -13,3 +13,4 @@
 *.a
 *.cache
 mkmf.log
+.sass-cache/

hamlit.gemspec

@@ -20,7 +20,7 @@ Gem::Specification.new do |spec|
 
   spec.add_dependency "temple"
   spec.add_dependency "thor"
-
+  spec.add_dependency "tilt"
   spec.add_development_dependency "benchmark-ips"
   spec.add_development_dependency "bundler"
   spec.add_development_dependency "erubis"
@@ -29,6 +29,7 @@ Gem::Specification.new do |spec|
   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 "unindent"

lib/hamlit/compilers/filter.rb

@@ -6,6 +6,7 @@ require 'hamlit/filters/javascript'
 require 'hamlit/filters/plain'
 require 'hamlit/filters/preserve'
 require 'hamlit/filters/ruby'
+require 'hamlit/filters/sass'
 
 module Hamlit
   module Compilers
@@ -23,6 +24,7 @@ module Hamlit
         register :plain,      Filters::Plain
         register :preserve,   Filters::Preserve
         register :ruby,       Filters::Ruby
+        register :sass,       Filters::Sass
       end
 
       def on_haml_filter(name, lines)

lib/hamlit/filters/sass.rb

@@ -0,0 +1,22 @@
+require 'tilt'
+require 'hamlit/filters/base'
+
+module Hamlit
+  module Filters
+    class Sass < Base
+      def compile(lines)
+        result  = compile_with_tilt(lines)
+        content = [:multi, [:static, "\n"], result]
+        [:html, :tag, 'style', [:html, :attrs], content]
+      end
+
+      private
+
+      def compile_with_tilt(lines)
+        source = lines.join("\n")
+        result = ::Tilt['t.sass'].new { source }.render
+        [:static, compile_lines(result.split("\n"), indent_width: 2)]
+      end
+    end
+  end
+end

spec/hamlit/filters/sass_spec.rb

@@ -0,0 +1,19 @@
+describe Hamlit::Filters::Sass do
+  describe '#compile' do
+    it 'renders sass filter' do
+      assert_render(<<-HAML, <<-HTML)
+        :sass
+          .users_controller
+            .show_action
+              margin: 10px
+              padding: 20px
+      HAML
+        <style>
+          .users_controller .show_action {
+            margin: 10px;
+            padding: 20px; }
+        </style>
+      HTML
+    end
+  end
+end