blog/plugins/octopress_filters.rb

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#custom filters for Octopress
require './plugins/pygments_code'
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module OctopressFilters
include HighlightCode
# Used on the blog index to split posts on the <!--more--> marker
def excerpt(input)
if input.index(/<!--\s*more\s*-->/i)
input.split(/<!--\s*more\s*-->/i)[0]
else
input
end
end
# 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
# for Github style codeblocks eg.
# ``` ruby
# code snippet
# ```
def backtick_codeblock(input)
code = nil
# Markdown support
input = input.gsub /<p>`{3}\s*(\w+)?<\/p>\s*<pre><code>\s*(.+?)\s*<\/code><\/pre>\s*<p>`{3}<\/p>/m do
lang = $1
if lang != ''
str = $2.gsub('&lt;','<').gsub('&gt;','>').gsub('&amp;','&')
code = highlight(str, lang)
"<figure role=code>#{code}</figure>"
else
code = tableize_code($2)
"<figure role=code>#{code}</figure>"
end
end
# Textile warning
input = input.gsub /<p>`{3}\s*(\w+)?<br\s*\/>\n(.+?)`{3}<\/p>/m do
lang = $1
"<pre><code>Back tick code blocks are not supported for Textile.\nTry HTML or Markdown instead or use the codeblock tag.\n\n{% codeblock #{lang} %}\nYour code snippet\n{% endcodeblock %}</code></pre>"
end
# Regular HTML support
input.gsub /^`{3}\s*(\w+)?\n(.+?)\n`{3}/m do
lang = $1
str = $2.gsub(/^\s{4}/, '')
if lang != ''
code = highlight(str, lang)
"<figure role=code>#{code}</figure>"
else
code = tableize_code($2.gsub('<','&lt;').gsub('>','&gt;'))
"<figure role=code>#{code}</figure>"
end
end
end
# Replaces relative urls with full urls
def expand_urls(input, url='')
url ||= '/'
input.gsub /(\s+(href|src)\s*=\s*["|']{1})(\/[^\"'>]*)/ do
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$1+url+$3
end
end
# Removes trailing forward slash from a string for easily appending url segments
def strip_slash(input)
if input =~ /(.+)\/$|^\/$/
input = $1
end
input
end
# Returns a url without the protocol (http://)
def shorthand_url(input)
input.gsub /(https?:\/\/)(\S+)/ do
$2
end
end
# replaces primes with smartquotes using RubyPants
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def smart_quotes(input)
require 'rubypants'
RubyPants.new(input).to_html
end
# 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
# Returns a datetime if the input is a string
def datetime(date)
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if date.class == String
date = Time.parse(date)
end
date
end
# Returns an ordidinal date eg July 22 2007 -> July 22nd 2007
def ordinalize(date)
date = datetime(date)
"#{date.strftime('%b')} #{ordinal(date.strftime('%e').to_i)}, #{date.strftime('%Y')}"
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end
# 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>"
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