minify.rb

# Script to minify JavaScript files in folder passed in first argument
# Created by Bas van Marwijk
# https://github.com/bascoder
# Run example: ruby minify.rb target_directory

dir = ARGV[0]

pids = []

# set multi threaded flag
if ARGV.length == 2 and ARGV[1] == 't'
  multi_threaded = true
else
  multi_threaded = false
end

# directory pattern to scan
pattern = "#{dir}#{File::SEPARATOR}*.js"

unless dir.is_a? String
  puts 'Expect first argument to be a directory path, but was ' + dir.to_s
  exit -1
end

# log output
puts 'dir: ' + dir
puts 'pattern: ' + pattern
puts 'JavaScript (including min.js) files found: ' + Dir[pattern].each.size.to_s

js_count = 0
fail_count = 0
success_count = 0

#iterate over JS files
Dir[pattern].each do |file|
  # only iterate over source files, no min.js files
  if file.include? '.js' and !file.include? '.min.js'

    js_count += 1

    # subtract .js extension
    without_extension = file[0, file.length - 3]

    if "#{without_extension}.js" != file
      puts 'error in ruby script'
      puts without_extension + '.js'
      puts 'should equal'
      puts file

      # increment fail counter
      fail_count += 1
    else
      puts 'minify ' + file

      #uglifyjs $FileName$ -o $FileNameWithoutExtension$.min.js --source-map $FileNameWithoutExtension$.min.map
      command = "uglifyjs #{file} -o #{without_extension}.min.js --source-map #{without_extension}.min.map"

      # execute command
      if multi_threaded
        pids.push(spawn command) # spawn doesn't wait for execution
      else
        system command # system does wait

        # check if command succeeded
        if $?.success?
          success_count += 1
          puts 'Successfully minified ' + file
        else
          puts $?
          puts 'WARNING, minify command failed ' + command

          fail_count += 1
        end
      end
    end
  end
end

# wait for all processes to finish
pids.each { |pid|
  puts "Wait for PID #{pid}"
  Process.wait pid

  # count success or fail
  !$?.nil? and $?.success? ? success_count += 1 : fail_count += 1
}

puts "Processed #{js_count} files, #{success_count} successes and #{fail_count} failures"
# exit success if fail_count == 0
exit(fail_count)