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, '>=');
	}

	}