added option to force syntax highlighting language, example: {% include_code file lang:ruby %}. Fixes #108

plugins/code_block.rb

@@ -53,7 +53,12 @@ module Jekyll
     def initialize(tag_name, markup, tokens)
       @title = nil
       @caption = nil
+      @filetype = nil
       @highlight = true
+      if markup =~ /\s+lang:(\w+)/i
+        @filetype = $1
+        markup = markup.sub(/\s+lang:\w+\s*/i,'')
+      end
       if markup =~ CaptionUrlTitle
         @file = $1
         @caption = "<figcaption><span>#{$1}</span><a href='#{$2 + $3}'>#{$4}</a></figcaption>"
@@ -64,7 +69,7 @@ module Jekyll
         @file = $1
         @caption = "<figcaption><span>#{$1}</span></figcaption>\n"
       end
-      if @file =~ /\S[\S\s]*\w+\.(\w+)/
+      if @file =~ /\S[\S\s]*\w+\.(\w+)/ && @filetype.nil?
         @filetype = $1
       end
       super

plugins/include_code.rb

@@ -30,6 +30,10 @@ module Jekyll
     def initialize(tag_name, markup, tokens)
       @title = nil
       @file = nil
+      if markup.strip =~ /\s+lang:(\w+)/i
+        @filetype = $1
+        markup = markup.strip.sub(/\s+lang:\w+\s*/i,'')
+      end
       if markup.strip =~ /(.*)?(\s+|^)(\/*\S+)/i
         @title = $1 || nil
         @file = $3
@@ -52,7 +56,7 @@ module Jekyll
 
       Dir.chdir(code_path) do
         code = file.read
-        @filetype = file.extname.sub('.','')
+        @filetype = file.extname.sub('.','') if @filetype.nil?
         title = @title ? "#{@title} (#{file.basename})" : file.basename
         url = "#{context.registers[:site].config['url']}/#{code_dir}/#{@file}"
         source = "<div><figure role=code><figcaption><span>#{title}</span> <a href='#{url}'>download</a></figcaption>\n"