Differential D18305 Diff 44025 src/filesystem/binary/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;
				}

				}