convert ACTS / tarsnap-generations style backups to tarsnapper style backups

snapper.php

<?php

$machine = 'mycomputername';

$max_cmd_len = intval(shell_exec('getconf ARG_MAX'));
$commands = array();
$commands_del = array();
$cur_command = '';
$cur_command_del = ' -d ';

$f = file_get_contents('archives');
$lines = explode(PHP_EOL, $f);

foreach ($lines as $line) {
	$parts = explode('_', $line);
	if (count($parts) != 2) continue;
	$parts_l = explode('-', $parts[0]);
	$parts_r = explode('-', $parts[1]);
	if ($parts_l[0] != $machine) continue;
	$new_name = $parts_r[1] . '-' . $parts_l[2] . $parts_l[3] . $parts_l[4] . '-' . str_replace(':', '', $parts_r[0]);
	$new_command = " -c -f $new_name @@$line";
	$new_command_del = " -f $line";
	$commands []= $new_command;
	//if (strlen($cur_command) + strlen($new_command) < $max_cmd_len) {
	//	$cur_command .= $new_command;
	//} else {
	//	$commands []= $cur_command;
	//	$cur_command = $new_command;
	//}
	if (strlen($cur_command_del) + strlen($new_command_del) < $max_cmd_len) {
		$cur_command_del .= $new_command_del;
	} else {
		$commands []= $cur_command_del;
		$cur_command_del = $new_command_del;
	}
	//echo $new_name . PHP_EOL;
}
$commands []= $cur_command;
$commands []= $cur_command_del;

foreach ($commands as $command) echo "tarsnap $command" . PHP_EOL;