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;
	}

	}