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# encoding: utf-8 module Nanoc3::Filters class ColorizeSyntax < Nanoc3::Filter DEFAULT_COLORIZER = :coderay def run(content, params={}) require 'nokogiri' # Take colorizers from parameters @colorizers = Hash.new(DEFAULT_COLORIZER) (params[:colorizers] || {}).each_pair do |language, colorizer| @colorizers[language] = colorizer end # Colorize doc = Nokogiri::HTML.fragment(content) doc.css('pre > code[class^="lang"]').each do |element| language = element['class'][/lang-([^ ]+)/].sub(/^lang-/, '') element.parent.replace( Nokogiri.make(highlight(element.inner_text, language, params)) ) end doc.to_s end private KNOWN_COLORIZERS = [ :coderay, :pygmentize ] def highlight(code, language, params={}) colorizer = @colorizers[language] if KNOWN_COLORIZERS.include?(colorizer) send(colorizer, code, language, params[colorizer]) else raise RuntimeError, "I don’t know how to highlight code using the “#{colorizer}” colorizer" end end def pygmentize(code, language, params={}) IO.popen("pygmentize -l #{language} -f html", "r+") do |io| io.write(code) io.close_write return io.read end end def coderay(code, language, params={}) require 'coderay' CodeRay.scan(code, language).div(params) end end end

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