PhutilDiffBinaryAnalyzer.php
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	<?php

	final class PhutilDiffBinaryAnalyzer
	extends PhutilBinaryAnalyzer {

	const BINARY = 'diff';

	protected function newBinaryVersion() {
	list($err, $stdout) = exec_manual('diff --version');

	if ($err) {
	return null;
	}

	return self::parseDiffBinaryVersion($stdout);
	}

	public static function parseDiffBinaryVersion($stdout) {
	$prefix = 'diff (GNU diffutils) ';

	if (preg_match('(^'.preg_quote($prefix).')', $stdout)) {
	$lines = phutil_split_lines($stdout, false);
	$line = head($lines);
	$version = substr($line, strlen($prefix));
	return $version;
	}

	return null;
	}

	}