moduleutils.php
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	<?php

	/*
	* Copyright 2011 Facebook, Inc.
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	function phutil_get_library_root($library) {
	return __phutil_library_registry('find', $library);
	}


	function phutil_get_library_root_for_path($path) {
	foreach (Filesystem::walkToRoot($path) as $dir) {
	if (@file_exists($dir.'/__phutil_library_init__.php')) {
	return $dir;
	}
	}
	return null;
	}

	function phutil_get_library_name_for_root($path) {
	$loaded = false;
	while (true) {
	$libs = __phutil_library_registry('list');
	$path = rtrim(Filesystem::resolvePath($path), '/');
	foreach ($libs as $lib => $root) {
	if (rtrim(Filesystem::resolvePath($root), '/') == $path) {
	return $lib;
	}
	}
	if ($loaded) {
	return null;
	} else {
	phutil_load_library($path);
	}
	} while (true);
	}