testing

PhabricatorRepositoryVersion.php
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			<?php

			final class PhabricatorRepositoryVersion extends Phobject {

			public static function getMercurialVersion() {
			list($err, $stdout, $stderr) = exec_manual('hg --version --quiet');

			// NOTE: At least on OSX, recent versions of Mercurial report this
			// string in this format:
			//
			// Mercurial Distributed SCM (version 3.1.1+20140916)

			$matches = null;
			$pattern = '/^Mercurial Distributed SCM \(version ([\d.]+)/m';
			if (preg_match($pattern, $stdout, $matches)) {
			return $matches[1];
			}

			return null;
			}

			/**
			* The `locate` command is deprecated as of Mercurial 3.2, to be
			* replaced with `files` command, which supports most of the same
			* arguments. This determines whether the new `files` command should
			* be used instead of the `locate` command.
			*
			* @param string $mercurial_version - The current version of mercurial
			* which can be retrieved by calling:
			* PhabricatorRepositoryVersion::getMercurialVersion()
			*
			* @return boolean True if the version of Mercurial is new enough to support
			* the `files` command, or false if otherwise.
			*/
			public static function isMercurialFilesCommandAvailable($mercurial_version) {
			$min_version_for_files = '3.2';
			return version_compare($mercurial_version, $min_version_for_files, '>=');
			}

			}