dynamic choice options

[chaoflow]

We have dynamic default values via lambda, I'd see myself often hacking around what could be achieved with dynamic types, ideally with the context available to react upon already parsed options/arguments:

@click.group()
@click.option('--foo')
def cmd(foo):
    pass

@cmd.command()
@click.option('--bar')
@click.option('--tag', type=lambda ctx: click.Choice(dynamic_list_depending_on_foo_and_bar))

With the above I see the issue often knowing how many arguments tag is going to eat from the command line. Maybe better:

@click.group()
@click.option('--foo')
def cmd(foo):
    pass

@cmd.command()
@click.option('--bar')
@click.option('--tag', type=click.Choice(lambda ctx: dynamic_list_depending_on_foo_and_bar))

[stopthatcow]

You may be interested in the autocompletion argument that can supply a callback for this usecase. See https://github.com/pallets/click/blob/master/docs/bashcomplete.rst

[zakini]

Is there still any interest in this feature? I could have a go at a PR if so.

For my use case, I'd only be interested in dynamic choices, not dynamic types. I pretty much want exactly what ls does if there are a lot of directories to show as possible completions: get confirmation from the user before doing some slow operation to load all the possible choices.

❯ ls /dev/
zsh: do you wish to see all 344 possibilities (86 lines)?