Commands

Commands

Commands are defined by attaching it to a regular Python function. The command is invoked by the user who send a message similar to the function name. For example, in the given command:

async def cmd_hi(self, ctx):
    await ctx.respond("Hello")

so that the command will invoked when a user send a /hi.

Since a command needs to be inside a class. A command must always have at least two parameter, self the plugin instance as the first and ctx which is the Context as the second one.

Parameters

Since we create a command with Python function name, we also have argument passing behaviour by the function parameters. Note that only command function that have this ability. An event listener will not have this feature.

Positional

The most basic parameters is a positional parameter.

async def cmd_test(self, ctx, arg):
    await ctx.respond(arg)

There are no limitation on this kind of parameter. You can have it as much as you want. The parameter is default to NoneType if the command message have no argument.

Keyword-Only Arguments

You can use this when you want to parse the rest of the message text to become one variable.

async def cmd_test(self, ctx, *, arg):
    await ctx.respond(arg)

By default, the Keyword-Only arguments are stripped from whitespace. Because of that the parameter is default to empty string ("") unlike the positional parameters. And take a note that ## you can only have one keyword-only argument for each command.

Converters

We try our best to make plugin creation easy. Sometimes a commands need an argument to make it properly. Hence, we're introducing a Converters. Converters comes in several types:

• A callable object that takes an argument and returns with a different type.
  • This can be your own function or something like bool and int.
• A custom converter class that inherits anjani.util.converter.Converter

We specify a converters by using something called a function annotation introduced on PEP 3107.

Basic Converter

A basic converter is a callable that takes in an argument and change it into something else.

For example, if we wanted to add two numbers together, we could request that they are turned into integers for us by specifying the converter:

async def cmd_add(self, ctx, num1: int, num2: int):
    await ctx.respond(num1 + num2)

Bool

To prevent ambiguities of bool E.G: when a non-empty string evaluated as True. We modify this a bit so that it evaluate based on the content of the argument as you can see below.

if arg in ("yes", "true", "enable", "on", "1"):
    return True
if arg in ("no", "false", "disable", "off", "0"):
    return False

Converter also works with any callable that takes a single parameter.

def lower(arg):
    return arg.lower()

async def cmd_test(self, ctx, text: to_lower):
    await ctx.respond(text)

You are free to modify an argument on that function. You also have a choice to use async (async def) or sync (def) function.

Advanced Converter

Sometimes the basic converter doesn't have enough information you need. For example you need the command.Context. In that case we provide a Converter class to do all that jobs. Defining a a custom converter of this require to have the Converter.__call__ method and this must be an Asynchronous method.

An example of advanced converter:

from anjani.utils.converter import Converter

class MediaGroup(Converter):

    async def __call__(self, ctx: command.Context):
        replied_id = ctx.message.reply_to_message.message_id
        chat_id = ctx.chat.id
        return await ctx.bot.client.get_media_group(chat_id, replied_id)


class Testing(plugin.Plugin):
    name = "Testing"

    async def cmd_test(self, ctx, arg: MediaGroup):
        print(arg)
        for i in arg:
            await ctx.respond(arg)

Pyrogram Converter

We provide a several pyrogram types converter. This converter might be have the most use case on the commands:

1. User
2. Chat
3. ChatMember

Under the hood, those are implemented with Advanced Converter as above. Below are our converter of those pyrogram types:

Pyrogram Types	Converter
User	UserConverter
Chat	ChatConverter
ChatMember	ChatMemberConverter

Use example of Pyrogram Converters:

from pyrogram.types import ChatMember

async def cmd_test(self, ctx, member: ChatMember):
    await ctx.send(f"User joined on {member.joined_date}")

You can also use the converter we provide to use in your custom converter:

from anjani.util import converter

class UserFullname(converter.UserConverter):
    async def __call__(self, ctx):
        user = await super().__call__(ctx)
        user.fullname = user.first_name + (user.last_name or "")   # add fullname attribute to user
        return user


async def cmd_test(self, ctx, member: UserFullname):
    await ctx.send(f"User joined on {member.joined_date}")

Typing

If you're working with type hinting, we have two accepted type hinting typing.Union and ``typing.Optional`. But currently we only convert to one of the types with left-to-right priority.

async def cmd_test(self, ctx, user: typing.Optional[pyrogram.types.User]):
    # Do something

async def cmd_test(self, ctx, user: typing.Union[pyrogram.types.User, None]):
    # Do something

Default Value

If you want to have a default value apart from the default value we provide (None), you can give a default value by your own.

async def cmd_test(self, ctx, number: int = 0):
    # Do something