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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;
			}

			}