hg_args.php
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Authored by epriestley on Nov 6 2013, 6:36 PM.

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	F78882: hg_args.php
	Nov 6 2013, 6:36 PM

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	private function getMercurialArguments() {
	// Mercurial sends arguments in HTTP headers. "Why?", you might wonder,
	// "Why would you do this?".

	$args_raw = array();
	for ($ii = 1; ; $ii++) {
	$header = 'HTTP_X_HGARG_'.$ii;
	if (!array_key_exists($header, $_SERVER)) {
	break;
	}
	$args_raw[] = $_SERVER[$header];
	}
	$args_raw = implode('', $args_raw);

	return id(new PhutilQueryStringParser())
	->parseQueryString($args_raw);
	}

	private function formatMercurialArguments($command, array $arguments) {
	$spec = $this->getMercurialCommandSpecification($command);

	$out = array();

	// Mercurial takes normal arguments like this:
	//
	// name <length(value)>
	// value

	$has_star = false;
	foreach ($spec as $arg_key) {
	if ($arg_key == '*') {
	$has_star = true;
	continue;
	}
	if (isset($arguments[$arg_key])) {
	$value = $arguments[$arg_key];
	$size = strlen($value);
	$out[] = "{$arg_key} {$size}\n{$value}";
	}
	}

	if ($has_star) {

	// Mercurial takes arguments for variable argument lists roughly like
	// this:
	//
	// * <count(args)>
	// argname1 <length(argvalue1)>
	// argvalue1
	// argname2 <length(argvalue2)>
	// argvalue2

	$count = count($arguments);

	$out[] = "* {$count}\n";

	foreach ($arguments as $key => $value) {
	if (in_array($key, $spec)) {
	// We already added this argument above, so skip it.
	continue;
	}
	$size = strlen($value);
	$out[] = "{$key} {$size}\n{$value}";
	}
	}

	$out = implode('', $out);
	if (strlen($out)) {
	$out .= "\n";
	}

	return $out;
	}

	private function getMercurialCommandSpecification($command) {
	// We need to enumerate all of the Mercurial wire commands because the
	// argument encoding varies based on the command. "Why?", you might ask,
	// "Why would you do this?".

	$commands = array(
	'batch' => array('cmds', '*'),
	'between' => array('pairs'),
	'branchmap' => array(),
	'branches' => array('nodes'),
	'capabilities' => array(),
	'changegroup' => array('roots'),
	'changegroupsubset' => array('bases heads'),
	'debugwireargs' => array('one two *'),
	'getbundle' => array('*'),
	'heads' => array(),
	'hello' => array(),
	'known' => array('nodes', '*'),
	'listkeys' => array('namespace'),
	'lookup' => array('key'),
	'pushkey' => array('namespace', 'key', 'old', 'new'),
	'stream_out' => array(''),
	'unbundle' => array('heads'),
	);

	if (!isset($commands[$command])) {
	throw new Exception("Unknown Mercurial command '{$command}!");
	}

	return $commands[$command];
	}

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epriestley edited the content of this paste. (Show Details)Nov 6 2013, 6:36 PM

epriestley changed the title of this paste from untitled to hg_args.php.

epriestley updated the paste's language from autodetect to autodetect.

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hg_args.php
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