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	/**			/**
	* Determine the width of the terminal, if possible. Returns `null` on failure.			* Determine the width of the terminal, if possible. Returns `null` on failure.
	*			*
	* @return int\|null Terminal width in characters, or null on failure.			* @return int\|null Terminal width in characters, or null on failure.
	*/			*/
	function phutil_console_get_terminal_width() {			function phutil_console_get_terminal_width() {
				static $width;

				if ($width === null) {
	if (phutil_is_windows()) {			if (phutil_is_windows()) {
	// TODO: Figure out how to get this working in Windows.			// TODO: Figure out how to get this working in Windows.
	return null;			return null;
	}			}

	$tmp = new TempFile();			$tmp = new TempFile();

	// NOTE: We can't just execute this because it won't be connected to a TTY			// NOTE: We can't just execute this because it won't be connected to a TTY
	// if we do.			// if we do.
	$err = phutil_passthru('tput cols > %s', $tmp);			$err = phutil_passthru('tput cols > %s', $tmp);

	if ($err) {			if ($err) {
	return null;			return null;
	}			}

	try {			try {
	$cols = Filesystem::readFile($tmp);			$cols = Filesystem::readFile($tmp);
	} catch (FilesystemException $ex) {			} catch (FilesystemException $ex) {
	return null;			return null;
	}			}

	$cols = (int)$cols;			$width = (int)$cols;
	if (!$cols) {			if (!$width) {
	return null;			$width = null;
				}
	}			}

	return $cols;			return $width;
	}			}