discord_reargparse

Provides support for RegEx based argument parsing in commands for the discord.py library.

param_converter = RegExArgConverter(
    r"^(\S+[\ \S]*?)(?:\ -c(\d+))?(\ -n)?$",
    # OR re.compile(r"^(\S+[\ \S]*?)(?:\ -c(\d+))?(\ -n)?$"),
    
    string = Parameter(
        default="hello!",
    ),
    count = Parameter(
        int,
        default=2,
    ),
    new_line = Parameter(
        lambda x: bool(x),
    )
)

# ...

@bot.command()
async def repeat(ctx, *, params:param_converter=param_converter.defaults):
    string = params["string"]
    count = params["count"]
    sep = "\n" if params.get("new_line", False) else " "
    
    await ctx.send(sep.join([string]*count))

@repeat.error
async def repeat_error(ctx, error):
    if isinstance(error, NotMatchedWithPattern):
        await ctx.send(
            "{0} not matched with pattern r'{1}'".format(
                repr(error.argstr), error.pattern.pattern,
            )
        )

On your discord server, the commands can be invoked like this:

!repeat

> hello! hello!

!repeat Hi -c3 -n

> Hi
> Hi
> Hi

!repeat hello
world

    → will raise a NotMatchedWithPattern exception

Installation

Installation is available via pip:

pip install discord_reargparse

Documentation

Initialize an RegExArgConverter as in the example above, annotate a keyword-only function argument in your command with the instance and, optionally, set its default value by using the .defaults attribute. Setting a default value can be omitted for non-optional regex groups.

It will raise a NotMatchedWithPattern exception if not matched with given regex pattern.

Inside the command, you can access the arguments as a dict.

command's usage

The usage string of repeat command is displayed like.

!help repeat

> repeat [params=Args(r'^(\S+[\ \S]*?)(?:\ -c(\d+))?(\ -n)?$' => [string=hello!] [count=2] <new_line>)]

You might also want to set the usage parameter of the command() function decorator to display a alternative usage string, especially when using the RegExArgConverter.defaults attribute.