Rake task to compile Less to CSS

Rakefile

require 'rubygems'
require 'less'
require 'rake'

SOURCE = "."
LESS = File.join( SOURCE, "path", "to", "less", "files" )
CONFIG = {
  'less'   => File.join( LESS, "less" ),
  'css'    => File.join( LESS, "css" ),
  'input'  => "style.less",
  'output' => "style.css"
}

desc "Compile Less"
task :lessc do
  less   = CONFIG['less']

  input  = File.join( less, CONFIG['input'] )
  output = File.join( CONFIG['css'], CONFIG['output'] )

  source = File.open( input, "r" ).read

  parser = Less::Parser.new( :paths => [less] )
  tree = parser.parse( source )

  File.open( output, "w+" ) do |f|
    f.puts tree.to_css( :compress => true )
  end
end # task :lessc