Automatically bump the year in the Copyright-notice headers of Ruby files.

bump_copyright.rb

require 'date'
require 'tempfile'
require 'fileutils'

YEAR      = Date.today.year.to_s
LAST_YEAR = (Date.today.year - 1).to_s

Dir.glob('lib/{**/}*.rb') do |path|
  File.open(path) do |file|
    tempfile = Tempfile.new('bump_copyright')
    replaced = false

    file.each_line do |line|
      if (!replaced && line =~ /^#\s+Copyright\s+\(c\)\s+\d+\s*-\s*\d+/)
        puts ">>> Updating Copyright date for #{path} ..."

        line     = line.sub(LAST_YEAR,YEAR)
        replaced = true
      end

      tempfile.write(line)
    end

    tempfile.flush
    tempfile.close

    FileUtils.cp(tempfile.path,path)
  end
end