DrydockCommandInterface.php
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	<?php

	abstract class DrydockCommandInterface extends DrydockInterface {

	const INTERFACE_TYPE = 'command';

	private $workingDirectoryStack = array();

	public function pushWorkingDirectory($working_directory) {
	$this->workingDirectoryStack[] = $working_directory;
	return $this;
	}

	public function popWorkingDirectory() {
	if (!$this->workingDirectoryStack) {
	throw new Exception(
	pht(
	'Unable to pop working directory, directory stack is empty.'));
	}
	return array_pop($this->workingDirectoryStack);
	}

	public function peekWorkingDirectory() {
	if ($this->workingDirectoryStack) {
	return last($this->workingDirectoryStack);
	}
	return null;
	}

	final public function getInterfaceType() {
	return self::INTERFACE_TYPE;
	}

	final public function exec($command) {
	$argv = func_get_args();
	$exec = call_user_func_array(
	array($this, 'getExecFuture'),
	$argv);
	return $exec->resolve();
	}

	final public function execx($command) {
	$argv = func_get_args();
	$exec = call_user_func_array(
	array($this, 'getExecFuture'),
	$argv);
	return $exec->resolvex();
	}

	abstract public function getExecFuture($command);

	protected function applyWorkingDirectoryToArgv(array $argv) {
	$directory = $this->peekWorkingDirectory();

	if ($directory !== null) {
	$cmd = $argv[0];
	$cmd = "(cd %s && {$cmd})";
	$argv = array_merge(
	array($cmd),
	array($directory),
	array_slice($argv, 1));
	}

	return $argv;
	}

	}