Twig REPL

twig-repl.php

<?php
/**
 * Twig REPL hack
 *
 * Arnaud Le Blanc <arnaud.lb@gmail.com>
 */

require 'lib/Twig/Autoloader.php';

Twig_Autoloader::register();

$loader = new Twig_Loader_Array(array());
$env = new Twig_Environment($loader);

$lineno = 0;

echo "$ ";

while (!feof(STDIN) && false !== $code = fgets(STDIN)) {
    try {

        $code = sprintf("{{ %s }}", trim($code));

        $loader->setTemplate('command line code', $code);
        $env->display('command line code');

        echo "\n";

    } catch (Exception $e) {
        printf("Error executing %s:\n", $code);
        printf("%s: %s\n", get_class($e), $e->getMessage());
    }

    echo "$ ";
}

Example:

$ php twig-repl.php
$ 512*2
1024
$ 512*2|number_format()
1024
$ (512*2)|number_format()
1,024
$