Non-intrusive social sharing tags for Jekyll. Note: uses deprecated/private APIs, probably against TOS or whatever

likes.rb

# likes.rb - non intrusive sharing tags for jekyll/liquid
# usage (unfortunately rather verbose because of liquid)
# {{ site.url | append: page.url | facebook_likes }} => Fixnum
# {{ site.url | append: page.url | facebook_share_link }} => a link to share this page
# {{ site.url | append: page.url | twitter_tweets }} => Fixnum
# {{ site.url | append: page.url | twitter_share_link }} => Fixnum
# if you're doing it a lot, try something like this
# {% assign absolute = site.url | append: page.url %}

# NOTE: twitter ignores localhost urls. if you try to tweet one, the url will not appear in your tweet

require 'cgi'
require 'open-uri'
require 'json'


module Jekyll
  module Filters
    # Configuration, change to your liking
    @@likes_production = Proc.new { |context| context.registers[:site].config[:production] == true }
    @@facebook_share_link_proc = Proc.new { |url,likes| "<a class=\"btn btn-mini btn-primary\" href=\"https://facebook.com/sharer/sharer.php?u=#{CGI::escape(url)}\";><i class=\"icon-facebook\"></i> Like (#{likes})</a>" }
    @@twitter_share_link_proc = Proc.new { |url,text,tweets|  "<a class=\"btn btn-mini btn-primary\" href=\"https://twitter.com/share?url=#{url}&text=#{CGI::escape(text)}\"><i class=\"icon-twitter\"></i> Tweet (#{tweets})</a>" }

    # "Caching"
    @@facebook_like_cache = {}
    @@twitter_tweet_cache = {}

    def facebook_likes(input)
      unless @@likes_production.call(@context) then return 0 end 
      if @@facebook_like_cache[input] then return @@facebook_like_cache[input] end
      uri = "https://api.facebook.com/method/fql.query?format=json&query=select%20%20like_count%20from%20link_stat%20where%20url%20=%20'#{input}'"
      rawjson = open(uri).read
      json = JSON.parse(rawjson)
      likes = (json and json.size > 0) ? json[0]['like_count'] : 0
      @@facebook_like_cache[input] = likes
      return likes
    end

    def facebook_share_link(url)
      @@facebook_share_link_proc.call(url, facebook_likes(url))
    end

    def twitter_tweets(input)
      unless @@likes_production.call(@context) then return 0 end
      if @@twitter_tweet_cache[input] then return @@twitter_tweet_cache[input] end

      uri = "http://urls.api.twitter.com/1/urls/count.json?url=#{input}"
      rawjson = open(uri).read
      json = JSON.parse(rawjson)
      count = (json and json.size > 0) ? json['count'] : 0
      @@twitter_tweet_cache[input] = count
      count
    end

    def twitter_share_link(url, text)
      @@twitter_share_link_proc.call(url, text, twitter_tweets(url))
    end
  end
end