Add Kramdown support (thanks Postmodern)

lib/tilt.rb

@@ -477,6 +477,7 @@ def precompiled(locals)
   require 'tilt/markdown'
   register BlueClothTemplate, 'markdown', 'mkd', 'md'
   register MarukuTemplate,    'markdown', 'mkd', 'md'
+  register KramdownTemplate,  'markdown', 'mkd', 'md'
   register RDiscountTemplate, 'markdown', 'mkd', 'md'
 
   require 'tilt/textile'

lib/tilt/markdown.rb

@@ -78,5 +78,26 @@ def evaluate(scope, locals, &block)
       @output ||= @engine.to_html
     end
   end
+
+  # Kramdown Markdown implementation. See:
+  # http://kramdown.rubyforge.org/
+  class KramdownTemplate < Template
+    def self.engine_initialized?
+      defined? ::Kramdown
+    end
+
+    def initialize_engine
+      require_template_library 'kramdown'
+    end
+
+    def prepare
+      @engine = Kramdown::Document.new(data, options)
+      @output = nil
+    end
+
+    def evaluate(scope, locals, &block)
+      @output ||= @engine.to_html
+    end
+  end
 end
 

test/tilt_kramdown_test.rb

@@ -0,0 +1,42 @@
+require 'contest'
+require 'tilt'
+
+begin
+  require 'kramdown'
+
+  class MarukuTemplateTest < Test::Unit::TestCase
+    test "registered for '.md' files" do
+      assert Tilt.mappings['md'].include?(Tilt::KramdownTemplate)
+    end
+
+    test "registered for '.mkd' files" do
+      assert Tilt.mappings['mkd'].include?(Tilt::KramdownTemplate)
+    end
+
+    test "registered for '.markdown' files" do
+      assert Tilt.mappings['markdown'].include?(Tilt::KramdownTemplate)
+    end
+
+    test "registered above MarukuTemplate" do
+      %w[md mkd markdown].each do |ext|
+        mappings = Tilt.mappings[ext]
+        kram_idx = mappings.index(Tilt::KramdownTemplate)
+        maru_idx = mappings.index(Tilt::MarukuTemplate)
+        assert kram_idx < maru_idx,
+          "#{kram_idx} should be lower than #{maru_idx}"
+      end
+    end
+
+    test "preparing and evaluating templates on #render" do
+      template = Tilt::KramdownTemplate.new { |t| "# Hello World!" }
+      assert_equal "<h1 id='hello_world'>Hello World!</h1>", template.render
+    end
+
+    test "can be rendered more than once" do
+      template = Tilt::KramdownTemplate.new { |t| "# Hello World!" }
+      3.times { assert_equal "<h1 id='hello_world'>Hello World!</h1>", template.render }
+    end
+  end
+rescue LoadError => boom
+  warn "Tilt::MarukuTemplate (disabled)\n"
+end