# Title: Simple Image tag for Jekyll
 # Author: Brandon Mathis http://brandonmathis.com
 # Description: Easily output images with optional class names and title/alt attributes
 #
 # Syntax {% image [class name(s)] url [title text] %}
 #
 # Example:

 # {% ima left half http://site.com/images/ninja.png Ninja Attack! %}

 #
 # Output:
 # <image class='left' src="http://site.com/images/ninja.png" title="Ninja Attack!" alt="Ninja Attack!">
 #
 
 module Jekyll
 
   class ImageTag < Liquid::Tag
     @img = nil
     @title = nil
     @class = ''

     @width = ''
     @height = ''

 
     def initialize(tag_name, markup, tokens)

       if markup =~ /(\S.*\s+)?(https?:\/\/|\/)(\S+)(\s+\d+\s+\d+)?(\s+.+)?/i
         @class = $1 || ''

         @img = $2 + $3

         if $5
           @title = $5.strip
         end
         if $4 =~ /\s*(\d+)\s+(\d+)/
           @width = $1
           @height = $2
         end

       end
       super
     end
 
     def render(context)
       output = super
       if @img

         "<img class='#{@class}' src='#{@img}' width='#{@width}' height='#{@height}' alt='#{@title}' title='#{@title}'>"

       else

         "Error processing input, expected syntax: {% img [class name(s)] /url/to/image [width height] [title text] %}"

       end
     end
   end
 end
 
 Liquid::Template.register_tag('img', Jekyll::ImageTag)