# File ext/tools/generate.rb, line 5
def main
  mode = nil
  ids1src = nil
  ids2src = nil
  template = nil
  output = nil

  parser = @parser = OptionParser.new
  parser.banner = "Usage: #{File.basename($0)} --mode=MODE [--ids1src=PATH] [--ids2src=PATH] [--output=PATH]"
  parser.on('--mode=MODE', 'check, eventids1, or eventids2table.') {|m|
    mode = m
  }
  parser.on('--ids1src=PATH', 'A source file of event-IDs 1 (parse.y).') {|path|
    ids1src = path
  }
  parser.on('--ids2src=PATH', 'A source file of event-IDs 2 (eventids2.c).') {|path|
    ids2src = path
  }
  parser.on('--output=PATH', 'An output file.') {|path|
    output = path
  }
  parser.on('--help', 'Prints this message and quit.') {
    puts parser.help
    exit true
  }
  begin
    parser.parse!
  rescue OptionParser::ParseError => err
    usage err.message
  end
  usage 'no mode given' unless mode
  case mode
  when 'check'
    usage 'no --ids1src' unless ids1src
    usage 'no --ids2src' unless ids2src
    h = read_ids1_with_locations(ids1src)
    check_arity h
    ids2 = read_ids2(ids2src)
    common = h.keys & ids2
    unless common.empty?
      abort "event crash: #{common.join(' ')}"
    end
    exit 0
  when 'eventids1'
    usage 'no --ids1src' unless ids1src
    result = generate_eventids1(read_ids1(ids1src))
  when 'eventids2table'
    usage 'no --ids2src' unless ids2src
    result = generate_eventids2_table(read_ids2(ids2src))
  end
  if output
    File.open(output, 'w') {|f|
      f.write result
    }
  else
    puts result
  end
end