Rename Alembic migrations to contain date time (PHP)

alembic_filename_date.php

<?php

// This script ONLY RETURNS BASH COMMANDS that would take care of the renaming.

// Usage:
// alembic_filename_date.php --glob=<glob_pattern:*.py> --format=<date_format:Y-m-d_H-i_>

$optGlob = '*.py';
$optFormat = 'Y-m-d_H-i_';

foreach ($argv as $a) {
	switch (true) {
		case preg_match('#--glob=([^\s]+)#', $a, $m):
			$optGlob = $m[1];
		break;
		case preg_match('#--format=([^\s]+)#', $a, $m):
			$optFormat = $m[1];
		break;
	}
}

$files = glob($optGlob);
$count = 0;

if (!$files) {
	printf("! Zero files matching '%s'.\n", $optGlob);
	exit(1);
}

foreach ($files as $f) {

	// Skip already in the correct format.
	$parsedDate = date_parse_from_format($optFormat . "+", $f);
	if (!$parsedDate['errors']) {

		// Date was able to be parsed - the filename is already in correct form.
		continue;

	}

	foreach (file($f) as $line) {
		if (preg_match('#^Create Date:\s*(.*)#', $line, $m)) {
			$date = strtotime($m[1]);
			break;
		}
	}

	$formatted = date($optFormat, $date);
	$new = $formatted . $f;

	$count++;
	printf ('mv "%s" "%s"%s', $f, $new, "\n");

}

if (!$count) {
	echo "! Zero files need to be renamed.\n";
}