Differential D18669 Diff 44825 src/console/PhutilConsoleMetrics.php

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				<?php

				final class PhutilConsoleMetrics extends Phobject {

				const DEFAULT_CONSOLE = 'default';

				private static $consoles = array();

				private $width = false;

				public static function getNamedConsole($key) {
				if (!isset(self::$consoles[$key])) {
				self::$consoles[$key] = new self();
				}

				return self::$consoles[$key];
				}

				public static function getDefaultConsole() {
				return self::getNamedConsole(self::DEFAULT_CONSOLE);
				}

				public function didGetWINCHSignal() {
				// When we receive a "WINCH" ("WINdow CHange") signal, clear the cached
				// information we have about the terminal.
				$this->width = false;

				return $this;
				}

				public function getTerminalWidth() {
				if ($this->width === false) {
				$this->width = $this->computeTerminalWidth();
				}

				return $this->width;
				}

				private function computeTerminalWidth() {
				if (phutil_is_windows()) {
				// TODO: Figure out how to do this on Windows.
				return null;
				}

				$tmp = new TempFile();

				// NOTE: We can't just execute this because it won't be connected to a TTY
				// if we do.
				$err = id(new PhutilExecPassthru('tput cols > %s', $tmp))
				->resolve();
				$stdout = Filesystem::readFile($tmp);
				unset($tmp);

				if ($err) {
				return null;
				}

				$width = (int)trim($stdout);
				if ($width > 0) {
				return $width;
				}

				return null;
				}
				}