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added video tag plugin

Brandon Mathis authored on 23/07/2011 at 21:39:49
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+# Title: Simple Video tag for Jekyll
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+# Author: Brandon Mathis http://brandonmathis.com
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+# Description: Easily output MPEG4 HTML5 video with a flash backup.
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+#
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+# Syntax {% video url/to/video [width height] [url/to/poster] %}
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+#
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+# Example:
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+# {% video http://site.com/video.mp4 720 480 http://site.com/poster-frame.jpg %}
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+#
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+# Output:
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+# <video width='720' height='480' preload='none' controls poster='http://site.com/poster-frame.jpg'>
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+#   <source src='http://site.com/video.mp4' type='video/mp4; codecs=\"avc1.42E01E, mp4a.40.2\"'/>
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+# </video>
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+#
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+
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+module Jekyll
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+
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+  class VideoTag < Liquid::Tag
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+    @video = nil
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+    @poster = ''
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+    @height = ''
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+    @width = ''
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+
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+    def initialize(tag_name, markup, tokens)
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+      if markup =~ /((https?:\/\/|\/)(\S+))(\s+(\d+)\s(\d+))?(\s+(https?:\/\/|\/)(\S+))?/i
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+        @video  = $1
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+        @width  = $5
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+        @height = $6
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+        @poster = $7
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+      end
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+      super
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+    end
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+
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+    def render(context)
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+      output = super
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+      if @video
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+        video =  "<video width='#{@width}' height='#{@height}' preload='none' controls poster='#{@poster}'>"
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+        video += "<source src='#{@video}' type='video/mp4; codecs=\"avc1.42E01E, mp4a.40.2\"'/></video>"
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+      else
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+        "Error processing input, expected syntax: {% video url/to/video [width height] [url/to/poster] %}"
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+      end
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+    end
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+  end
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+end
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+
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+Liquid::Template.register_tag('video', Jekyll::VideoTag)
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+