friendica/include/friendica_smarty.php

<?php

use Friendica\Core\Addon;
use Friendica\Render\ITemplateEngine;

define('SMARTY3_TEMPLATE_FOLDER', 'templates');

class FriendicaSmarty extends Smarty
{
	public $filename;

	function __construct()
	{
		parent::__construct();

		$a = get_app();
		$theme = current_theme();

		// setTemplateDir can be set to an array, which Smarty will parse in order.
		// The order is thus very important here
		$template_dirs = ['theme' => "view/theme/$theme/" . SMARTY3_TEMPLATE_FOLDER . "/"];
		if (x($a->theme_info, "extends"))
			$template_dirs = $template_dirs + ['extends' => "view/theme/" . $a->theme_info["extends"] . "/" . SMARTY3_TEMPLATE_FOLDER . "/"];
		$template_dirs = $template_dirs + ['base' => "view/" . SMARTY3_TEMPLATE_FOLDER . "/"];
		$this->setTemplateDir($template_dirs);

		$this->setCompileDir('view/smarty3/compiled/');
		$this->setConfigDir('view/smarty3/config/');
		$this->setCacheDir('view/smarty3/cache/');

		$this->left_delimiter = $a->get_template_ldelim('smarty3');
		$this->right_delimiter = $a->get_template_rdelim('smarty3');

		// Don't report errors so verbosely
		$this->error_reporting = E_ALL & ~E_NOTICE;
	}

	function parsed($template = '')
	{
		if ($template) {
			return $this->fetch('string:' . $template);
		}
		return $this->fetch('file:' . $this->filename);
	}

}

class FriendicaSmartyEngine implements ITemplateEngine
{
	static $name = "smarty3";

	public function __construct()
	{
		if (!is_writable('view/smarty3/')) {
			echo "<b>ERROR:</b> folder <tt>view/smarty3/</tt> must be writable by webserver.";
			killme();
		}
	}

	// ITemplateEngine interface
	public function replaceMacros($s, $r)
	{
		$template = '';
		if (gettype($s) === 'string') {
			$template = $s;
			$s = new FriendicaSmarty();
		}

		$r['$APP'] = get_app();

		// "middleware": inject variables into templates
		$arr = [
			"template" => basename($s->filename),
			"vars" => $r
		];
		Addon::callHooks("template_vars", $arr);
		$r = $arr['vars'];

		foreach ($r as $key => $value) {
			if ($key[0] === '$') {
				$key = substr($key, 1);
			}
			$s->assign($key, $value);
		}
		return $s->parsed($template);
	}

	public function getTemplateFile($file, $root = '')
	{
		$a = get_app();
		$template_file = get_template_file($a, SMARTY3_TEMPLATE_FOLDER . '/' . $file, $root);
		$template = new FriendicaSmarty();
		$template->filename = $template_file;
		return $template;
	}
}