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+# Title: Simple Image Figure tag for Jekyll

+# Author: Brandon Mathis http://brandonmathis.com

+# Description: Easily output images in <figure> with an optional <figcaption> and class names.

+#

+# Syntax {% figure [class name(s)] url [caption text] %}

+#

+# Example:

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

+#

+# Output:

+# <figure class='left half'><img src="http://site.com/images/ninja.png"><figcaption>Ninja Attack!</figcaption></figure>

+#

+# Example 2 (image with caption)

+# {% figure /images/ninja.png Ninja Attack! %}

+#

+# Output:

+# <figure><img src="/images/ninja.png"><figcaption>Ninja Attack!</figcaption></figure>

+#

+# Example 3 (just an image with classes)

+# {% figure right /images/ninja.png %}

+#

+# Output:

+# <figure><img class="right" src="/images/ninja.png"></figure>

+#

+

+module Jekyll

+

+  class FigureImageTag < Liquid::Tag

+    ClassImgCaption = /(\S[\S\s]*)\s+(https?:\/\/|\/)(\S+)\s+(.+)/i

+    ClassImg = /(\S[\S\s]*)\s+(https?:\/\/|\/)(\S+)/i

+    ImgCaption = /^\s*(https?:\/\/|\/)(\S+)\s+(.+)/i

+    Img = /^\s*(https?:\/\/|\/)(\S+\s)/i

+

+    @img = nil

+    @caption = nil

+    @class = ''

+

+    def initialize(tag_name, markup, tokens)

+      if markup =~ ClassImgCaption

+        @class = $1

+        @img = $2 + $3

+        @caption = $4

+      elsif markup =~ ClassImg

+        @class = $1

+        @img = $2 + $3

+      elsif markup =~ ImgCaption

+        @img = $1 + $2

+        @caption = $3

+      elsif markup =~ Img

+        @img = $1 + $2

+      end

+      super

+    end

+

+    def render(context)

+      output = super

+      if @img

+        figure =  "<figure class='#{@class}'>"

+        figure += "<img src='#{@img}'>"

+        figure += "<figcaption>#{@caption}</figcaption>" if @caption

+        figure += "</figure>"

+      else

+        "Error processing input, expected syntax: {% figure [class name(s)] /url/to/image [caption] %}"

+      end

+    end

+  end

+end

+

+Liquid::Template.register_tag('figure', Jekyll::FigureImageTag)