# Title: Image tag with caption for Jekyll
 # Description: Easily output images with captions
 
 module Jekyll
 
   class CaptionImageTag < 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
         "<span class='#{('caption-wrapper ' + @class).rstrip}'>" +
           "<img class='caption' src='#{@img}' width='#{@width}' height='#{@height}' title='#{@title}'>" +
           "<span class='caption-text'>#{@title}</span>" +
         "</span>"
       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('imgcap', Jekyll::CaptionImageTag)