Builds css from sass and css files - using Nette conventions for directory structure

build_css.php

<?php
$documentRootStyles = realpath(__DIR__ . '/../document_root/css');
$appDir = realpath(__DIR__ . '/../app');
foreach (new DirectoryIterator($appDir) as $file) {
	if (!$file->isDir() || !preg_match('/.+Module/', $file->getFilename())) {
		continue;
	}
	$module = lcfirst(substr($file->getFilename(), 0, -6));

	$stylesDir = $appDir . '/' . $file->getFilename() . '/styles';
	if (is_dir($stylesDir)) {
		foreach (new DirectoryIterator($stylesDir) as $file) {
			if (!$file->isFile()) {
				continue;
			}
			$source = $file->getPathname();
			$ext = pathinfo($source, PATHINFO_EXTENSION);
			$target = $documentRootStyles . '/' . $module . '/' . substr(basename($source), 0, -strlen($ext) - 1) . '.css';
			@mkdir(dirname($target));
			if ($ext == 'sass' || $ext == 'scss') {
				shell_exec($command = 'sass --no-cache --style expanded "' . $source . '" "' . $target . '"');
			} elseif ($ext == 'css') {
				copy($source, $target);
			}
		}
	}
}