Brett's custom Jekyll filters

brett.rb

# encoding: utf-8
#
# Brett's misc filters
require './plugins/post_filters'
require 'fileutils'

module Jekyll
  module Filters
    def keyword_string(keywords)
      keywords.join(" ")
    end

    def og_tags(tags)
      tags.map {|tag|
        %Q{<meta property="article:tag" content="#{tag}">}
      }.join("\n")
    end

    def first_img(input)
      imgurl = ""
      if input =~ /img.*?src="(.*?)\.(jpg|png)"/m
        imgurl = "#{$1}_lg.#{$2}"
      elsif input =~ /\{% img (\w+ )?(\d+ )*((\S+?)\.(jpg|png|gif|svg)) %\}/m
        imgurl = "#{$4}_lg.#{$5}"
      end
      imgurl = "http://brettterpstra.com/#{imgurl.gsub(/^\//,'')}" unless imgurl =~ /^http/ or imgurl == ""
      imgurl == "" ? "http://brettterpstra.com/images/mepic_lg.jpg" : imgurl
    end

    def og_image(input)
      if input.strip =~ /^http:\/\/brettterpstra.com(\/.*?\.(jpg|png))$/
        filename = File.expand_path(File.join(%x{git rev-parse --show-toplevel}.strip,"source"+$1.strip))
        filename.gsub!(/_lg(\.(jpg|png))$/,"\\1") unless File.exists?(filename)
        width = %x{sips -g pixelWidth "#{filename}"|awk '{print $2}'}.strip
        height = %x{sips -g pixelHeight "#{filename}"|awk '{print $2}'}.strip
        imgtype = File.extname(filename) =~ /.jpe?g/ ? "jpeg" : "png"
        out = %Q{<meta property="og:image" content="#{input.strip}">\n}
        out += %Q{<meta property="og:image:type" content="image/#{imgtype}" />\n}
        out += %Q{<meta property="og:image:width" content="#{width}" />\n}
        out += %Q{<meta property="og:image:height" content="#{height}" />\n}
      end
    end

    def largest_img(input)
      src_images = input.scan(/<img(.*?((src|width|height)="(.*?)"))+[^>]+>/m)
    end
  end

  # class ContentFilters < PostFilter
  #   def pre_write(post)
  #     if post.respond_to?(:url)
  #       file_path = File.expand_path(File.join("public",post.url + "index.html"))
  #       file_bak = File.expand_path(File.join("public",post.url + "index_o.html"))
  #       if File.exists?(file_path)
  #         $stderr.puts "Compressing #{file_path}"
  #         FileUtils.mv(file_path,file_bak)
  #         system %Q{/usr/local/bin/htmlcompressor --type=html -o "#{file_path}" #{file_bak}}
  #       end
  #     end
  #   end
  # end
end