prepare.rb

#!/usr/bin/env ruby

Signal.trap('INT') { abort }

REGEX = /\A\/\*.+?\*\/\n/m.freeze
PREAMBLE = DATA.read.freeze

def process(input)
  if input.start_with? '/'
    before = input.hash
    input.sub! REGEX, PREAMBLE
    input if input.hash != before
  else
    input.prepend "#{PREAMBLE}\n"
  end
end

ARGV.each do |path|
  File.open path, 'r+t' do |file|
    output = process file.read
    next unless output

    file.rewind
    file.write output
    file.truncate file.pos
  end
end

__END__
/* ReaPack: Package manager for REAPER
 * Copyright (C) 2015-2024  Christian Fillion
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */