Fix canonical urls and blog post dates

plugins/filters.rb

@@ -0,0 +1,76 @@
+module Jekyll
+  module AssetFilter
+    # Octopress filters
+    # Copyright (c) 2014 Brandon Mathis
+
+    # MIT License
+
+    # 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
+
+    def site_url
+      'https://home-assistant.io'
+    end
+
+    # Prepend a url with the full site url
+    #
+    # input - a url
+    #
+    # Returns input with all urls expanded to include the full site url
+    # e.g. /images/awesome.gif => http://example.com/images/awesome.gif
+    #
+    def full_url(input)
+      expand_url(input, site_url)
+    end
+
+    # Prepends input with a url fragment
+    #
+    # input - An absolute url, e.g. /images/awesome.gif
+    # url   - The fragment to prepend the input, e.g. /blog
+    #
+    # Returns the modified url, e.g /blog
+    #
+    def expand_url(input, url=nil)
+      url ||= root
+
+      url = if input.start_with?("http", url)
+        input
+      else
+        File.join(url, input)
+      end
+
+      smart_slash(url)
+    end
+
+    # Ensure a trailing slash if a url ends with a directory
+    def smart_slash(input)
+      if !(input =~ /\.\w+$/)
+        input = File.join(input, '/')
+      end
+      input
+    end
+
+    # Convert url input into a standard canonical url by expanding urls and
+    # removing url fragments ending with `index.[ext]`
+    def canonical_url(input)
+      full_url(input).sub(/index\.\w+$/i, '')
+    end
+  end
+end
+
+Liquid::Template.register_filter(Jekyll::AssetFilter)