hgsprintf.php
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	<?php

	/**
	* Format a Mercurial revset expression. Supports the following conversions:
	*
	* %s Symbol
	* Escapes a Mercurial symbol, like a branch or bookmark name.
	*
	* %R Rrraw Rreferrrence / Rrrrevset
	* Passes text through unescaped (e.g., an already-escaped revset).
	*/
	function hgsprintf($pattern /* , ... */) {
	$args = func_get_args();
	return xsprintf('xsprintf_mercurial', null, $args);
	}

	/**
	* @{function:xsprintf} callback for Mercurial encoding.
	*/
	function xsprintf_mercurial($userdata, &$pattern, &$pos, &$value, &$length) {
	$type = $pattern[$pos];

	switch ($type) {
	case 's':
	$value = "'".addcslashes($value, "'\\")."'";
	break;
	case 'R':
	$type = 's';
	break;
	}

	$pattern[$pos] = $type;
	}