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require 'pygments'
require 'fileutils'
require 'digest/md5'
PYGMENTS_CACHE_DIR = File.expand_path('../../_code_cache', __FILE__)
FileUtils.mkdir_p(PYGMENTS_CACHE_DIR)
module HighlightCode
def highlight(str, lang)
str = pygments(str, lang).match(/<pre>(.+)<\/pre>/m)[1].to_s.gsub(/ *$/, '') #strip out divs <div class="highlight">
tableize_code(str, lang)
end
def pygments(code, lang)
if defined?(PYGMENTS_CACHE_DIR)
path = File.join(PYGMENTS_CACHE_DIR, "#{lang}-#{Digest::MD5.hexdigest(code)}.html")
if File.exist?(path)
highlighted_code = File.read(path)
else
highlighted_code = Pygments.highlight(code, :lexer => lang, :formatter => 'html')
File.open(path, 'w') {|f| f.print(highlighted_code) }
end
else
highlighted_code = Pygments.highlight(code, :lexer => lang, :formatter => 'html')
end
highlighted_code
end
def tableize_code (str, lang = '')
table = '<div class="highlight"><table cellpadding="0" cellspacing="0"><tr><td class="gutter"><pre class="line-numbers">'
code = ''
str.lines.each_with_index do |line,index|
table += "<span class='line'>#{index+1}</span>\n"
code += "<div class='line'>#{line}</div>"
end
table += "</pre></td><td class='code' width='100%'><pre><code class='#{lang}'>#{code}</code></pre></td></tr></table></div>"
end
end
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