PhutilConsoleMetrics.php
a95adc0ea0f8stable

PhutilConsoleMetrics.php
View Options

			<?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;
			}
			}