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;
	}
	}