Dust + Slim multi builder Watches a directory in a sleep loop, and executes build chains based on file extensions. Currently supports dust and slim

dust_slim.rb

#!/usr/bin/env ruby

require 'rubygems'
require 'slim'
require 'slim/command'
require 'pry'

def dust(tag, tag_end = nil)
  ret = "{##{tag}}"
  ret += yield
  if tag_end then ret += "{#{tag_end}}" else ret += "{/#{tag}}" end
  return ret
end

handlers = {
  'slim' => proc do |input_file, name| 
      ret = Slim::Template.new(input_file).render()
      input_file.close
      StringIO.new(ret)
    end,
  'dust' => proc do |input_file, name|
      IO.popen("dustc -n=#{name} -", "w+").tap do |io|
        io.write input_file.read
        input_file.close
        io.close_write  
      end
    end
}

stats = {}
while true
  Dir.glob('*').each do |file_name|
    # Only process updated files
    new_stat = File.stat(file_name)
    next if stats[file_name] == new_stat
    stats[file_name] = new_stat

    # Open first file for reading
    file = File.open(file_name, 'r')
    file_handlers = file_name.split('.')

    # Try to go down the processing chain, and write any final files
    skip = true
    while handlers.has_key?(cur_handler = file_handlers.pop)
      skip = false
      file = handlers[cur_handler].call(file, file_handlers.join('.'))
    end

    next if skip 
    next if !file

    # Return the last popped cur_handler onto the 
    file_handlers.push(cur_handler) if cur_handler
    out_name = file_handlers.join('.')
    File.open(out_name, 'w') do |out_file|
      puts "Writing: #{out_name}"
      out_file.write(file.read)
      file.close
    end
  end
  sleep 1
end