Initial commit

LICENSE

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+The MIT License (MIT)
+
+Copyright (c) 2013 Sam Rayner
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software is furnished to do so,
+subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

README.md

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+Jekyll Asset Path Tag
+=====================
+
+A liquid tag to output a relative URL for assets based on the post or page, allowing you to organise your assets into subdirectories.
+
+Syntax: `{% asset_path [filename] %}`
+
+##Installation
+Copy asset_path_tag.rb into */_plugins* ([Jekyll][j]) or */plugins* ([Octopress][o])
+
+##Examples
+
+```
+{% asset_path my-image.png %}
+```
+in post 2013-01-01-post-title would output:
+```
+/assets/posts/post-title/my-image.png
+```
+in page my-first-page would output:
+```
+/assets/my-first-page/my-image.png
+```
+
+Useful for images and links in Markdown or HTML:
+```
+[Download script]({% asset_path my-script.js %})
+<img src="{% asset_path my-image.png %}" alt="My Image" />
+```
+
+[j]: http://jekyllrb.com/
+[o]: http://octopress.org/

asset_path_tag.rb

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+# Title: Asset path tag for Jekyll
+# Author: Sam Rayner http://samrayner.com
+# Description: Output a relative URL for assets based on the post or page
+#
+# Syntax {% asset_path [filename] %}
+#
+# Examples:
+# {% asset_path kitten.png %} on post 2013-01-01-post-title
+# {% asset_path pirate.mov %} on page page-title
+#
+# Output:
+# /assets/posts/post-title/kitten.png
+# /assets/page-title/pirate.mov
+#
+
+module Jekyll
+  class AssetPathTag < Liquid::Tag
+    @filename = nil
+
+    def initialize(tag_name, markup, tokens)
+      #strip leading and trailing quotes
+      @filename = markup.strip.gsub(/^("|')|("|')$/, '')
+      super
+    end
+
+    def render(context)
+      if @filename.empty?
+        return "Error processing input, expected syntax: {% asset_path [filename] %}"
+      end
+
+      path = ""
+      page = context.environments.first["page"]
+
+      #if a post
+      if page["id"]
+        #loop through posts to find match and get slug
+        context.registers[:site].posts.each do |post|
+          if post.id == page["id"]
+            path = "/posts/#{post.slug}"
+          end
+        end
+      else
+        path = page["url"].sub(/\/$/, "")
+      end
+
+      #strip filename
+      path = File.dirname(path) if path =~ /\.\w+$/
+
+      "/assets#{path}/#{@filename}"
+    end
+  end
+end
+
+Liquid::Template.register_tag('asset_path', Jekyll::AssetPathTag)