Use our magic linking functions from Kramdown, just like we do with Redcarpet. Fixes #999

middleman-core/lib/middleman-core/renderers/kramdown.rb

@@ -0,0 +1,41 @@
+require "kramdown"
+
+module Middleman
+  module Renderers
+
+    # Our own Kramdown Tilt template that simply uses our custom renderer.
+    class KramdownTemplate < ::Tilt::KramdownTemplate
+      def evaluate(scope, locals, &block)
+        @output ||= begin
+          output, warnings = MiddlemanKramdownHTML.convert(@engine.root, @engine.options)
+          @engine.warnings.concat(warnings)
+          output
+        end
+      end
+    end
+
+    # Custom Kramdown renderer that uses our helpers for images and links
+    class MiddlemanKramdownHTML < ::Kramdown::Converter::Html
+      cattr_accessor :middleman_app
+
+      def convert_img(el, indent)
+        attrs = el.attr.dup
+        link = attrs.delete('src')
+        middleman_app.image_tag(link, attrs)
+      end
+
+      def convert_a(el, indent)
+        content = inner(el, indent)
+        attr = el.attr.dup
+        if attr['href'] =~ /\Amailto:/
+          mail_addr = attr['href'].sub(/\Amailto:/, '')
+          attr['href'] = obfuscate('mailto') << ":" << obfuscate(mail_addr)
+          content = obfuscate(content) if content == mail_addr
+        end
+
+        link = attr.delete('href')
+        middleman_app.link_to(content, link, attr)
+      end
+    end
+  end
+end

middleman-core/lib/middleman-core/renderers/markdown.rb

@@ -23,13 +23,18 @@ module Middleman
 
           # Once configuration is parsed
           app.after_configuration do
+            markdown_exts = %w(markdown mdown md mkd mkdn)
 
             begin
               # Look for the user's preferred engine
               if config[:markdown_engine] == :redcarpet
                 require "middleman-core/renderers/redcarpet"
-                ::Tilt.prefer(::Middleman::Renderers::RedcarpetTemplate)
+                ::Tilt.prefer(::Middleman::Renderers::RedcarpetTemplate, *markdown_exts)
                 MiddlemanRedcarpetHTML.middleman_app = self
+              elsif config[:markdown_engine] == :kramdown
+                require "middleman-core/renderers/kramdown"
+                ::Tilt.prefer(::Middleman::Renderers::KramdownTemplate, *markdown_exts)
+                MiddlemanKramdownHTML.middleman_app = self
               elsif !config[:markdown_engine].nil?
                 # Map symbols to classes
                 markdown_engine_klass = if config[:markdown_engine].is_a? Symbol
@@ -41,7 +46,7 @@ module Middleman
                 end
 
                 # Tell tilt to use that engine
-                ::Tilt.prefer(markdown_engine_klass)
+                ::Tilt.prefer(markdown_engine_klass, *markdown_exts)
               end
             rescue LoadError
               logger.warn "Requested Markdown engine (#{config[:markdown_engine]}) not found. Maybe the gem needs to be installed and required?"