PhutilDiffBinaryAnalyzer.php
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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;
			}

			}