Add license to all sources

add_licenses.rb

#!/usr/bin/env ruby

LICENSE_TEXT = "%s Copyright (C) 2007-2014 My Cool license text %s"

SKIP_PATTERN = /.*Copyright\(C\)*/
# rb, js, hbs, css

FILE_TYPES = {
  :rb => {
    :pattern => '**/*.rb',
    :comment => ['#', ''],
    :first_line => /#!.*/
  },
  :js => {
    :pattern => '**/*.js',
    :comment => ['//', ''],
  },
  :hbs => {
    :pattern => '**/*.hbs',
    :comment => ['{{!', '}}']
  },
  :css => {
    :pattern => '**/style.css',
    :comment => ['/*', '*/']
  },
  :rake => {
    :pattern => 'Rakefile',
    :comment => ['#', '']
  },
  :rack => {
    :pattern => 'config.ru',
    :comment => ['#', '']
  }

}

EXCLUDE = [
  /.*\/libs\/.*/,
  /dist.*/
  /node_modules.*/
]

FILE_TYPES.each do |pref, file_type|
  # for all files matching pattern
  Dir.glob(file_type[:pattern]).each do |filename|
    # if it's in excluded folders, skip
    if EXCLUDE.reduce(false) {|result, pattern| result || filename =~ pattern}
      puts "Skipping #{filename}, in an excluded folder"
      next
    end

    # read file to a string
    s = IO.read(filename)
    first_line_end_index = s.index("\n")
    if first_line_end_index
      first_line = s[0, first_line_end_index]
    else
      first_line = s
    end

    # idempotent - if the first line is license, skip
    if first_line =~ SKIP_PATTERN
      puts "Skipping #{filename}, already has license"
      next
    end

    license = LICENSE_TEXT % file_type[:comment]

    # if the first line is something that should stay there, put it on the second line
    if file_type[:first_line] && first_line =~ file_type[:first_line]
      s.insert(first_line_end_index, "\n" + license)
    else
      # otherwise put it at the beginning
      s = license + "\n" + s
    end

    File.open(filename, 'w') {|f| f.write(s) }

    puts "Added license to #{filename}"
  end
end