parallel_assets_compiler.gemspec

# -*- encoding: utf-8 -*-

Gem::Specification.new do |s|
  s.name        = 'parallel_assets_compiler'
  s.version     = '0.3'
  s.platform    = Gem::Platform::RUBY
  s.author      = 'Jørgen Orehøj Erichsen, Alexander Maslov'
  s.email       = 'joe@erichsen.net, drakmail@gmail.com'
  s.summary     = 'Compile assets in parallel'
  s.description = 'Compile assets in parallel to speed up deployment'

  s.files         = ['parallel_assets_compiler.rb']
  s.require_path  = '.'

  s.add_dependency('parallel')
  s.add_dependency('actionpack')
end

parallel_assets_compiler.rb

# Compile assets in parallel to speed up deployment
#
# Works by monkey patching actionpack from Rails 3.2.5
#
# Use it by adding this to your Gemfile and run bundle install
#
# gem 'parallel_assets_compiler', :git => 'git://gist.github.com/2873091.git'
#
# Inspired by
# https://github.com/steel/sprockets/commit/6327afc3341e34efd1dfdcfad08e3b9d85f7fd4a
# https://github.com/hornairs/sprockets-rails-parallel

require 'sprockets/static_compiler'
require 'parallel'

module Sprockets
  class StaticCompiler

    def compile
      manifest = {}
      logical_paths = []
      env.each_logical_path(paths) do |logical_path|
        logical_paths << logical_path
      end
      # Compute!
      Parallel.map(logical_paths) do |logical_path|
        if asset = env.find_asset(logical_path)
          digest_path = write_asset(asset)
          manifest[asset.logical_path] = digest_path
          manifest[aliased_path_for(asset.logical_path)] = digest_path
        end
      end
      write_manifest(manifest) if @manifest
    end

  end
end