How to get path of twig template - php

Question

I'm using two twig template paths found in this question How do I specify two locations for Twig templates?
$template = isset($config->template) ? $config->template : 'default';
$templates_dir = $root . 'templates' . DIRECTORY_SEPARATOR;
if (isset($config->template) && $config->template != 'default') {
$template = array($templates_dir . $config->template, $templates_dir . 'default');
} else {
$template = $templates_dir . 'default';
}
$loader = new Twig_Loader_Filesystem($template);
and I have code like this:
function render($request, $page, $data = array()) {
global $twig, $config;
$template = isset($config->template) ? $config->template : 'default';
$base = baseURI($request);
return $twig->render($page, array_merge(array(
"path" => $base . '/templates/' . $template,
"root" => $base
), $data));
}
and what I need is to get path of the template so I can use it as 'path' variable (so I can use current path for assets like "{{path}}/img/foo.png").

Answer 1

By searching source code I found solution in one of the test file:
$loader->getSourceContext($page)->getPath();
so if you want to have a path you need to remove template name:
$page = 'admin.html';
$path = $loader->getSourceContext($page)->getPath();
$path = preg_replace('%/'.$page.'$%', '', $path);
and if you want to get relative path you can use:
preg_replace("%" . __DIR__ . "%", "", $path);
You can wrap this in a function:
function template_path($page) {
global $loader;
$path = preg_replace("%" . __DIR__ . "%", "", $loader->getSourceContext($page)->getPath());
return preg_replace('%/'.$page.'$%', '', $path);
}