A pre-commit hook to check if jammit needs to be run

git-jammit-precommit

#!/usr/bin/env ruby
#
# A pre-commit hook to test if jammit needs to be run
# In case you don't like on the fly stuff
#

require 'rubygems'
require 'jammit'

def check_assets(config)
  Jammit.load_configuration(config)
  [:javascripts, :stylesheets].each do |type|
    Jammit.configuration[type].each do |key, globs|
      if !check_group(type, key, globs)
        $stderr.puts "run jammit"
        exit 1
      end
    end
  end
end

def check_group(type, key, globs)
  case type
  when :js, :javascripts
    ext = '.js'
  when :css, :stylesheets
    ext = '.css'
  else
    raise ArgumentError "Invalid type"
  end
  asset_path = File.join('public', Jammit.package_path, "#{key}#{ext}")
  if !File.exists?(asset_path)
    $stderr.puts "asset #{asset_path} missing"
    return false
  end
  mtime = File.mtime(asset_path)

  globs.each do |g|
    Dir.glob(g) do |filename|
      if File.mtime(filename) > mtime
        $stderr.puts "#{filename} newer then #{asset_path}"
        return false
      end
    end
  end
  true
end

check_assets(Jammit::DEFAULT_CONFIG_PATH)