holman · October 19, 2015 01:18 · Oct 19, 2015
diff --git a/jekyll_media_length.rb b/jekyll_media_length.rb
@@ -0,0 +1,53 @@
+# jekyll_media_length / by @holman
+#
+#   Drop the length of a particular audio file and junk into your Jekyll page.
+#   (See https://twitter.com/Una/status/655856628198014976 for more context).
+#
+# INSTALL:
+#
+#   brew install taglib
+#   gem install taglib-ruby
+#
+#   Toss this file into your _plugins directory.
+#
+# USAGE:
+#
+#   In your HTML page webzone device, do a liquid tag with the path to the audio
+#   file, like:
+#
+#     {% media_length media/song.mp3 %}
+#     # => 4:12
+#
+# YAY NEATO
+#
+#   Have a cupcake, you've earned it.
+#
+
+require 'taglib'
+
+module Jekyll
+  class MediaLength < Liquid::Tag
+    def initialize(tag_name, filename, tokens)
+      super
+      @filename = filename.strip
+    end
+
+    def render(context)
+      length = nil
+
+      TagLib::FileRef.open(@filename) do |file|
+        properties = file.audio_properties if file
+        length = properties.length         if properties
+      end
+
+      if length
+        minutes = length / 60
+        seconds = length % 60
+
+        "#{minutes}:#{"%.2d" % seconds}"
+      end
+    end
+  end
+end
+
+Liquid::Template.register_tag('media_length', Jekyll::MediaLength)