plugins/octopress_filters.rb
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 #custom filters for Octopress
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 require './plugins/pygments_code'
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 module OctopressFilters
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   include HighlightCode
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   # Used on the blog index to split posts on the <!--more--> marker
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   def excerpt(input)
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     if input.index(/<!--\s*more\s*-->/i)
       input.split(/<!--\s*more\s*-->/i)[0]
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     else
       input
     end
   end
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   # Summary is used on the Archive pages to return the first block of content from a post.
   def summary(input)
     if input.index(/\n\n/)
       input.split(/\n\n/)[0]
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     else
       input
     end
   end
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   # for Github style codeblocks eg.
   # ``` ruby
   #     code snippet
   # ```
   def backtick_codeblock(input)
     input.gsub /<p>`{3}\s(\w+)<\/p>.+<pre><code>(.+)<\/code><\/pre>.+`{3}<\/p>/m do
       lang = $1
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       str  = $2.gsub('&lt;','<').gsub('&gt;','>')
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       highlight(str, lang)
     end
   end
 
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   # Replaces relative urls with full urls
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   def expand_urls(input, url='')
     url ||= '/'
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     input.gsub /(\s+(href|src)\s*=\s*["|']{1})(\/[^\"'>]+)/ do
       $1+url+$3
     end
   end
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   # Removes trailing forward slash from a string for easily appending url segments
   def strip_slash(input)
     if input =~ /(.+)\/$|^\/$/
       input = $1
     end
     input
   end
 
   # Returns a url without the protocol (http://)
   def shorthand_url(input)
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     input.gsub /(https?:\/\/)(\S+)/ do
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       $2
     end
   end
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   # replaces primes with smartquotes using RubyPants
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   def smart_quotes(input)
     require 'rubypants'
     RubyPants.new(input).to_html
   end
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   # Returns a title cased string based on John Gruber's title case http://daringfireball.net/2008/08/title_case_update
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   def titlecase(input)
     input.titlecase
   end
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   # Returns a datetime if the input is a string
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   def datetime(date)
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     if date.class == String
       date = Time.parse(date)
     end
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     date
   end
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   # Returns an ordidinal date eg July 22 2007 -> July 22nd 2007
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   def ordinalize(date)
     date = datetime(date)
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     "#{date.strftime('%b')} #{ordinal(date.strftime('%e').to_i)}, #{date.strftime('%Y')}"
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   end
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   # Returns an ordinal number. 13 -> 13th, 21 -> 21st etc.
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   def ordinal(number)
     if (11..13).include?(number.to_i % 100)
       "#{number}<span>th</span>"
     else
       case number.to_i % 10
       when 1; "#{number}<span>st</span>"
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       when 2; "#{number}<span>nd</span>"
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       when 3; "#{number}<span>rd</span>"
       else    "#{number}<span>th</span>"
       end
     end
   end
 end
 Liquid::Template.register_filter OctopressFilters
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