tsprintf.php
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	<?php

	/**
	* Format text for terminal output. This function behaves like `sprintf`,
	* except that all the normal conversions (like "%s") will be properly escaped,
	* and additional conversions are supported:
	*
	* %B (Block)
	* Escapes text, but preserves tabs and newlines.
	*
	* %R (Raw String)
	* Inserts raw, unescaped text. DANGEROUS!
	*
	* Particularly, this will escape terminal control characters.
	*/
	function tsprintf($pattern /* , ... */) {
	$args = func_get_args();
	$string = xsprintf('xsprintf_terminal', null, $args);
	return new PhutilTerminalString($string);
	}

	/**
	* Callback for terminal encoding, see @{function:tsprintf} for use.
	*/
	function xsprintf_terminal($userdata, &$pattern, &$pos, &$value, &$length) {
	$type = $pattern[$pos];

	switch ($type) {
	case 's':
	$value = PhutilTerminalString::escapeStringValue($value, false);
	$type = 's';
	break;
	case 'B':
	$value = PhutilTerminalString::escapeStringValue($value, true);
	$type = 's';
	break;
	case 'R':
	$type = 's';
	break;
	}

	$pattern[$pos] = $type;
	}