Commands

• Basics
  • Getting started
  • Arguments and options
  • Registering commands
• Input
  • Helpers
• Output
  • Helpers
  • Formatting
• Calling commands from commands
• Dependency injection

The Mako command line tool comes with a set of useful commands but you can also create your own.

Basics

Getting started

All commands must extend the mako\reactor\Command base command and implement the execute method.

<?php

namespace app\console\commands;

use mako\reactor\Command;

class Hello extends Command
{
	public function execute()
	{
		$this->write('Hello, World!');
	}
}

You can return a custom exit code from your command's execute method. The default code if none is returned is 0.

Arguments and options

Passing arguments to a command is easy.

<?php

namespace app\console\commands;

use mako\reactor\Command;

class Hello extends Command
{
	public function execute($arg2)
	{
		$this->write('Hello, ' . $arg2 . '!');
	}
}

$arg0 is the reactor script and $arg1 is the name of the command.

You can now execute your command from the command line.

php reactor hello dude

You can, of course, also use options or named arguments.

<?php

namespace app\console\commands;

use mako\reactor\Command;

class Hello extends Command
{
	public function execute($name)
	{
		$this->write('Hello, ' . $name . '!');
	}
}

You can now execute your command from the command line.

php reactor hello --name=dude

Options can also be used as boolean flags.

<?php

namespace app\console\commands;

use mako\reactor\Command;

class Hello extends Command
{
	public function execute($shout = false)
	{
		$greeting = 'Hello, World!';

		if($shout !== false)
		{
			$greeting = strtoupper($greeting);
		}

		$this->write($greeting);
	}
}

You can now execute your command from the command line.

php reactor hello --shout

Both arguments and options can be documented using the $commandInformation property.

protected $commandInformation =
[
	'description' => 'Print out a greeting.',
	'options' =>
	[
		'shout' =>
		[
			'optional'    => true,
			'description' => 'Should we output upper-case?',
		],
	],
];

It is generally a good idea to document your arguments and options since this allows for a more user friendly error message if a required argument or option is omitted. You can also set the $isStrict property to TRUE if you want the command to fail if a non-documented argument or option is used.

Registering commands

You'll have to register your command with the reactor command line tool before you can use it.

Commands are registered in the app/config/application.php configuration file. The array key is the name of your command and the value is the command class name.

Check out the this page of the documentation to see how you register your custom commands in packages.

'commands' =>
[
	'hello' => 'app\console\commands\Hello',
],

You can now call your custom command like this.

php reactor hello

Input

Helpers

The question method lets you ask the user for input.

$input = $this->question('How old are you?');

You can also specify a default return value in the event that the user chooses not to enter anything. The default return value for empty input is NULL.

$input = $this->question('How old are you?', 25);

The secret method lets you ask the user for hidden input.

$input = $this->secret('Password:');

You can also specify a default return value in the event that the user chooses not to enter anything. The default return value for empty input is NULL.

$input = $this->secret('Password:', false);

The secret method will throw a RuntimeException if its unable to hide the user input. You can make the method fall back to non-hidden input by passing TRUE to the optional third parameter.

The confirm method lets you ask the user to confirm their action.

if($this->confirm('Do you want to delete all your files?'))
{
	// Delete all files
}

The default answer is n (false) but you can choose to make y (true) the default answer.

if($this->confirm('Do you want to delete all your files?', 'y'))
{
	// Delete all files
}

Output

Helpers

The write method lets you write output.

$this->write('Hello, World!');

The method writes to STDOUT by default but you can make it write to STDERR like this.

$this->write('Hello, World!', Output::ERROR);

There's also a handy error method that lets you write to STDERR.

$this->error('Hello, World!');

The nl method writes a newline to the output.

$this->nl();

The clear method lets you clear all output from the terminal window.

$this->clear();

The bell method rings the terminal bell.

$this->bell();

You can also make it ring multiple times if you want to.

$this->bell(3);

The countdown method will print a countdown that disappears after n seconds.

$this->countdown(5);

The progressBar method will let you display a nice progressbar. This is useful if your command is processing multiple items.

$items = 100;

$progressbar = $this->progressBar($items);

for($i = 0; $i < $items; $i++)
{
	$progressbar->advance();
}

The table method lets you output a nice ASCII table.

$this->table(['Col1', 'Col2'], [['R1 C1', 'R1 C2'], ['R2 C1', 'R2 C2']]);

This code above will result in a table looking like this.

-----------------
| Col1  | Col2  |
-----------------
| R1 C1 | R1 C2 |
| R2 C1 | R2 C2 |
-----------------

The ol method lets you output an ordered list.

$this->ol(['one', 'two', 'three', ['one', 'two'], 'four']);

The example above will output the following list.

1. one
2. two
3. three
   1. one
   2. two
4. four

The ul method lets you output an unordered list.

$this->ul(['one', 'two', 'three', ['one', 'two'], 'four']);

The example above will output the following list.

* one
* two
* three
  * one
  * two
* four

Formatting

You can format your output using formatting tags.

$this->write('<blue>Hello, World!</blue>');

You can also nest formatting tags. Just make sure to close them in the right order.

$this->write('<bg_green><black>Hello, World</black><yellow>!<yellow></bg_green>');

If you find yourself using the same nested set of formatting tags over and over again, then you'll probably want to define your own custom tags. This can be done using the Formatter::addStyle() method.

$this->output->getFormatter()->addStyle('awesome', ['bg_green', 'black', 'blinking']);

Tags can also be escaped by prepending them with a backslash.

$this->write('\<blue>Hello, World\</blue>');

If you want to escape all tags in a string then you can use the Formatter::escape() method.

$escaped = $this->output->getFormatter()->escape($string);

Note that formatting will only work on linux/unix and windows consoles with ANSI support.

Formatting is stripped when the output is redirected (e.g. to a log file php reactor command > log.txt).

Calling commands from commands

If you need to call a command from another command then you can use the FireTrait.

The fire method executes your command in a separate process and lets you handle the output using a closure.

<?php

namespace app\console\commands;

use mako\reactor\Command;
use mako\reactor\traits\FireTrait;

class Proxy extends Command
{
	use FireTrait;

	public function execute()
	{
		$this->fire('hello --name=dude', function($buffer)
		{
			$this->output->write($buffer);
		});
	}
}

If don't want to wait for the command to finish then you can start a background process using the fireAndForget method.

<?php

namespace app\console\commands;

use mako\reactor\Command;
use mako\reactor\traits\FireTrait;

class Manager extends Command
{
	use FireTrait;

	public function execute()
	{
		$this->fireAndForget('worker --file=1 >> /var/log/worker');
	}
}

Dependency injection

Commands are instantiated by the dependency injection container. This makes it easy to inject your dependencies using the constructor.

<?php

namespace app\console\commands;

use mako\reactor\Command;

class Hello extends Command
{
	protected $config;

	public function __construct(Input $input, Output $output, Config $config)
	{
		parent::__construct($input, $output);

		$this->config = $config;
	}
}

Note that commands expect the first two constructor parameters to be instances of the Input and Output classes.

You can also inject your dependencies directly into the execute method since its executed by the Container::call() method.

public function execute(Config $config)
{
	$foo = $config->get('settings.foo');
}

Commands are also container aware. You can read more about what this means here.