Input channels file.
    --output-dir 
          Destination directory for generated files.
EOD;
}
$input_file = "";
$output_dir = "";
for ($i = 1; $i < $argc;) {
    $arg = $argv[$i++];
    switch ($arg) {
        case "--input-file":
            $input_file = $argv[$i++];
            break;
        case "--output-dir":
            $output_dir = $argv[$i++];
            break;
        case "--help":
            print_help($argv[0]);
            exit(0);
        default:
            fatal_error("Unknown option: {$arg}");
    }
}
if ($input_file == "") {
    fatal_error("--input-file missing");
}
if ($output_dir == "") {
    fatal_error("--output-dir missing");
}
if (($data = file_get_contents($input_file)) === FALSE) {
    fatal_error("Failed to read input file");
}
if (!tokenize($data, $tokens)) {
    fatal_error("Failed to tokenize");
}
$i = 0;
$channels_defines = "";
$channels_list = "";
reset($tokens);
while (1) {
    if (($ch_name = current($tokens)) === FALSE) {
        break;
    }
    next($tokens);
    if (($ch_priority = current($tokens)) === FALSE) {
        fatal_error("missing priority");
    }
    next($tokens);
    if ($ch_name[0] != "name") {
        fatal_error("name is not a name");
    }
    if ($ch_priority[0] != "number") {
        fatal_error("priority is not a number");
    }
    $channel_file = <<