Creating Commands

Last updated last month

Introduction

It's extremely simple to add commands to Masonite via the craft command tool and Service Providers. If you have been using Masonite for any amount of time you will learn that commands are a huge part of developing web applications with Masonite. We have made it extremely easy to create these commands and add them to craft to build really fast personal commands that you might use often.

Masonite uses the Cleo package for creating and consuming commands so for more extensive documentation on how to utilize commands themselves, how to get arguments and options, and how to print colorful text to the command line.

Read more about Cleo by visiting the Cleo Documentation.

Getting Started

You can create commands by using craft itself:

terminal
$ craft command HelloCommand

This will create a app/commands/HelloCommand.py file with boilerplate code that looks like this:

app/commands/HelloCommand.py
""" A HelloCommand Command """
from cleo import Command
class HelloCommand(Command):
"""
Description of command
command:name
{argument : description}
"""
def handle(self):
pass

Let's create a simple hello name application which prints "hello your-name" to the console.

Where it says command:name inside the docstring we can put hello and inside the argument we can put name like so:

app/commands/HelloCommand.py
""" A HelloCommand Command """
from cleo import Command
class HelloCommand(Command):
"""
Say hello to you
hello
{name : Your name}
"""
def handle(self):
pass

Inside the handle method we can get the argument passed by specifying self.argument('name'). Simply put:

app/commands/HelloCommand.py
""" A HelloCommand Command """
from cleo import Command
class HelloCommand(Command):
"""
Say hello to you
hello
{name : Your name}
"""
def handle(self):
print('Hello {0}'.format(self.argument('name')))

That's it! Now we just have to add it to our craft command.

Adding Our Command To Craft

We can add commands to craft by creating a Service Provider and registering our command into the container. Craft will automatically run all the register methods on all containers and retrieve all the commands.

Let's create a Service Provider:

terminal
$ craft provider HelloProvider

This will create a provider in app/providers/HelloProvider.py that looks like:

app/providers/HelloProvider.py
''' A HelloProvider Service Provider '''
from masonite.provider import ServiceProvider
class HelloProvider(ServiceProvider):
def register(self):
pass
def boot(self):
pass

Let's import our command and register it into the container. Also because we are only registering things into the container, we can set wsgi = False so it is not ran on every request and only before the server starts:

app/providers/HelloProvider.py
''' A HelloProvider Service Provider '''
from masonite.provider import ServiceProvider
from app.commands.HelloCommand import HelloCommand
class HelloProvider(ServiceProvider):
wsgi = False
def register(self):
self.app.bind('HelloCommand', HelloCommand())
def boot(self):
pass

Make sure you instantiate the command. Also the command name needs to end in "Command". So binding HelloCommand will work but binding Hello will not. Craft will only pick up commands that end in Command. This is also case sensitive so make sure Command is capitalized.

Adding The Service Provider

Like normal, we need to add our Service Provider to the PROVIDERS list inside our config/providers.py file:

config/application.py
from app.providers.HelloProvider import HelloProvider
...
PROVIDERS = [
...
# Application Providers
UserModelProvider,
MiddlewareProvider,
# New Hello Provider
HelloProvider,
]

That's it! Now if we run:

terminal
$ craft

We will see our new hello command:

terminal
help Displays help for a command
hello Say hello to you
install Installs all of Masonite's dependencies

and if we run:

terminal
$ craft hello Joseph

We will see an output of:

terminal
Hello Joseph