Commands

• Basics
  • Getting started
  • Registering commands
• Input
  • Arguments and options
    • Flags
  • Interactive input
• Output
  • Basics
  • 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
{
	protected $description = 'Prints out "Hello, World!".';

	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.

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

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

You can now call your custom command like this.

php reactor hello

Input

Arguments and options

You'll most likely want to pass arguments to your commands and to do so you'll have to define them in the getArguments method.

public function getArguments(): array
{
	return
	[
		new Argument('argument', 'This is a positional argument'),
		new Argument('--option1', 'This is an option argument'),
		new Argument('-o|--option2', 'This is an option argument with an alias'),
		new Argument('--option3', 'This is an optional option argument', Argument::IS_OPTIONAL),
	];
}

Note that there are 4 reserved argument names: command, --env, --help and --mute.

Next you'll have to add matching camel cased arguments to your execute method.

public function execute(string $argument, string $option1, string $option2, string $option3 = null)
{
	// ...
}

You can now pass values to your command like this:

php reactor command "argument value" --option1="option1 value" -o "option3 value"

Flags

In the example above we made one of our arguments optional by using the Argument::IS_OPTIONAL flag. Below you'll see the complete list of available flags that you can use:

You can also make your own combination of flags:

new Argument('--arg', 'Description', Argument::IS_OPTIONAL | Argument::IS_ARRAY | Argument::IS_INT);

Note that boolean arguments are set as optional by default and the value will automatically be set to false if not used.

Interactive input

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

Basics

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();

Helpers

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

The alert method lets you output alert panels that will auto-wrap your text to fit the console window. You can use one of the predefined templates (default, info, success, warning, and danger) or pass your own.

$this->alert('This is a success alert.', Alert::SUCCESS);

$this->alert('This is a custom alert.', '<bg_purple><white>%s</white></bg_purple>');

Note that all output formatting tags present in an alert message will be escaped.

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 you 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.