Application.php
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	<?php

	namespace Nasqueron\SAAS\PhpBB\Runner;

	use Keruald\Commands\Command;
	use Keruald\Commands\ExitCode;

	use Dotenv\Dotenv;

	use InvalidArgumentException;
	use BadMethodCallException;
	use Exception;

	class Application extends Command {

	/**
	* @var string
	*/
	private $taskName;

	/**
	* @var string
	*/
	private $taskClassName = "";

	public function main () : int {

	self::loadEnvironment();

	if ($this->getArgc() > 1) {
	$this->taskName = $this->getArgv()[1];
	return $this->runTask();
	}

	$this->printUsage();
	return ExitCode::ILLEGAL_OPTION;
	}

	private static function loadEnvironment () : void {
	$dotenv = new Dotenv(__DIR__);
	$dotenv->safeLoad();
	}

	///
	/// Runner helper methods
	///

	private function runTask () : int {
	try {
	$this->resolveTaskName();
	} catch (InvalidArgumentException $exception) {
	$this->getDisplay()->error("Unknown command " . $this->taskName);
	return ExitCode::ILLEGAL_OPTION;
	}

	try {
	$this->callTaskRunner();
	} catch (BadMethodCallException $ex) {
	$this->printUsageForTask();
	return ExitCode::ILLEGAL_OPTION;
	} catch (Exception $ex) {
	$this->handleTaskException($ex);
	return ExitCode::FAILURE;
	}

	return ExitCode::SUCCESS;
	}

	/**
	* Finds if a tasks with this name exists, and resolves class name.
	*
	* @throws \InvalidArgumentException
	*/
	private function resolveTaskName () : void {
	$this->taskClassName = TasksMap::getTaskClassName($this->taskName);
	}

	/**
	* @throws \BadMethodCallException
	* @throws \Exception
	*/
	private function callTaskRunner () : void {
	forward_static_call(
	[$this->taskClassName, "runWithArgs"],
	$this->getTaskArguments()
	);
	}

	private function getTaskArguments () : array {
	// At this stage, the argv array contains
	// saas-phpbb <task name> [arguments for the tasks]
	// ~~~~~~~~~~~~~~~~~~~~~~~~~
	// ^ the part we return

	return array_slice($this->getArgv(), 2);
	}

	///
	/// Task errors methods
	///

	private function handleTaskException (Exception $ex) : void {
	$this->printTaskError($ex->getMessage());
	}

	private function printTaskError (string $message) : void {
	$this->getDisplay()->error(
	$this->getTaskPrefix() . ": " . $message
	);
	}

	private function getTaskPrefix () : string {
	return $this->getCommandName() . " " . $this->taskName;
	}

	///
	/// Usage helper methods
	///

	private function printUsage () {
	$name = $this->getCommandName();
	$this->getDisplay()->error("Usage: $name <task> [arguments]");
	}

	private function printUsageForTask () {
	$usage = $this->getUsageForTask();
	$usage = str_replace('%command%', $this->taskName, $usage);
	$this->getDisplay()->error($usage);
	}

	private function getUsageForTask () : string {
	if ($this->taskClassName === "") {
	$this->resolveTaskName();
	}

	return forward_static_call([$this->taskClassName, "getUsage"]);
	}

	}

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