Add a `build_bootstrap` script.

Generates `mustache.php`, a single-file bootstrap library which is a lot easier to include in your project.

.gitignore

@@ -1,2 +1,3 @@
 composer.lock
 vendor
+mustache.php

bin/build_bootstrap.php

@@ -0,0 +1,147 @@
+#!/usr/bin/env php
+<?php
+
+/*
+ * This file is part of Mustache.php.
+ *
+ * (c) 2012 Justin Hileman
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * A shell script to create a single-file class cache of the entire Mustache
+ * library:
+ *
+ *     $ bin/build_bootstrap.php
+ *
+ * ... will create a `mustache.php` bootstrap file in the project directory,
+ * containing all Mustache library classes. This file can then be included in
+ * your project, rather than requiring the Mustache Autoloader.
+ */
+$baseDir = realpath(dirname(__FILE__).'/..');
+
+require $baseDir.'/src/Mustache/Autoloader.php';
+Mustache_Autoloader::register();
+
+// delete the old file
+$file = $baseDir.'/mustache.php';
+if (file_exists($file)) {
+    unlink($file);
+}
+
+// and load the new one
+SymfonyClassCollectionLoader::load(array(
+    '\Mustache_Engine',
+    '\Mustache_Compiler',
+    '\Mustache_Context',
+    '\Mustache_HelperCollection',
+    '\Mustache_Loader_ArrayLoader',
+    '\Mustache_Loader_FilesystemLoader',
+    '\Mustache_Loader_MutableLoader',
+    '\Mustache_Loader_StringLoader',
+    '\Mustache_Loader',
+    '\Mustache_Parser',
+    '\Mustache_Template',
+    '\Mustache_Tokenizer',
+), dirname($file), basename($file, '.php'));
+
+/**
+ * SymfonyClassCollectionLoader.
+ *
+ * Based heavily on the Symfony ClassCollectionLoader component, with all
+ * the unnecessary bits removed.
+ *
+ * @license http://www.opensource.org/licenses/MIT
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class SymfonyClassCollectionLoader
+{
+    static private $loaded;
+
+    /**
+     * Loads a list of classes and caches them in one big file.
+     *
+     * @param array   $classes    An array of classes to load
+     * @param string  $cacheDir   A cache directory
+     * @param string  $name       The cache name prefix
+     * @param string  $extension  File extension of the resulting file
+     *
+     * @throws InvalidArgumentException When class can't be loaded
+     */
+    static public function load(array $classes, $cacheDir, $name, $extension = '.php')
+    {
+        // each $name can only be loaded once per PHP process
+        if (isset(self::$loaded[$name])) {
+            return;
+        }
+
+        self::$loaded[$name] = true;
+
+        $content = '';
+        foreach ($classes as $class) {
+            if (!class_exists($class) && !interface_exists($class) && (!function_exists('trait_exists') || !trait_exists($class))) {
+                throw new InvalidArgumentException(sprintf('Unable to load class "%s"', $class));
+            }
+
+            $r = new ReflectionClass($class);
+            $content .= preg_replace(array('/^\s*<\?php/', '/\?>\s*$/'), '', file_get_contents($r->getFileName()));
+        }
+
+        $cache = $cacheDir.'/'.$name.$extension;
+        self::writeCacheFile($cache, self::stripComments('<?php '.$content));
+    }
+
+    /**
+     * Writes a cache file.
+     *
+     * @param string $file    Filename
+     * @param string $content Temporary file content
+     *
+     * @throws RuntimeException when a cache file cannot be written
+     */
+    static private function writeCacheFile($file, $content)
+    {
+        $tmpFile = tempnam(dirname($file), basename($file));
+        if (false !== @file_put_contents($tmpFile, $content) && @rename($tmpFile, $file)) {
+            chmod($file, 0666 & ~umask());
+
+            return;
+        }
+
+        throw new RuntimeException(sprintf('Failed to write cache file "%s".', $file));
+    }
+
+    /**
+     * Removes comments from a PHP source string.
+     *
+     * We don't use the PHP php_strip_whitespace() function
+     * as we want the content to be readable and well-formatted.
+     *
+     * @param string $source A PHP string
+     *
+     * @return string The PHP string with the comments removed
+     */
+    static private function stripComments($source)
+    {
+        if (!function_exists('token_get_all')) {
+            return $source;
+        }
+
+        $output = '';
+        foreach (token_get_all($source) as $token) {
+            if (is_string($token)) {
+                $output .= $token;
+            } elseif (!in_array($token[0], array(T_COMMENT, T_DOC_COMMENT))) {
+                $output .= $token[1];
+            }
+        }
+
+        // replace multiple new lines with a single newline
+        $output = preg_replace(array('/\s+$/Sm', '/\n+/S'), "\n", $output);
+
+        return $output;
+    }
+}