Haml/Sass builder script (great for Wordpress themes & other HTML-like templates)

haml-sass builder

require 'digest/md5'

=begin

About: 
This script automatically runs on a 2-second loop, searches the current directory for haml & sass files that have been modified since the last iteration and builds them as needed into a file with the same name minus the .haml/sass extension. I wrote it so I could use Haml & Sass to develop Wordpress themes.

How-to:
1) Name your source files with the extension you'd like them to have, then add ".haml" or ".sass" as appropriate... 
For example: index.php.haml and styles.css.sass

2) Open a terminal window in your development directory and run "ruby build.rb"

3) Tweak your haml & sass, refresh your PHP app (ie your Wordpress site) & Enjoy!

Have fun,
Peter Kappus
August 2011
http://www.peterkappus.com

=end



def generate(type,options="")
  Dir["*.#{type}"].each do |f|
    newname = f.gsub(/.#{type}/,'')
    note = "THIS FILE MODIFIED VIA THE BUILDER SCRIPT... modify #{f}.#{type} file instead."
    
    #brittle solution for making it a comment in the appropriate language
    if(type=="sass") then
      note = "/* #{note}*/"
    else
      note = "<?php # #{note}?>"
    end
    
    #hash the contents of the file to see if it's changed since our last build
    latest_md5 = Digest::MD5.hexdigest(File.read(f))

    #if so, do a rebuild
    if(latest_md5 != @hashes[f]) then      
      File.open(newname, "w") do |fw|
        fw.write note + "\n" + `#{type} #{options} #{f}`
        puts "generating new version of #{newname}"
      end
      @hashes[f] = latest_md5
    end
  end
end


@hashes = Hash.new
while(true) do

  generate("haml","--no-escape-attrs")
  generate("sass")
 
  sleep 2
  puts Time.now.to_s
end