Arguments can't be autocompleted as files on Typer.

[i30817]

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• I added a very descriptive title here.
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• I already checked if it is not related to Typer but to Click.

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Example Code

from typing import Optional, List
from typer import style, echo, Typer, Exit, Argument, Option, Context

def complete_path(ctx: Context, args: List[str], incomplete: str):
    #usually when autocompleting, if you return a empty list,
    #typer will allow the console to autocomplete, except that
    #for arguments, a space is added no matter what you type, which ruins it
    return []

def single(cfg: Path = Argument(None, exists=True, file_okay=True, dir_okay=False, readable=True, resolve_path=True,shell_complete=complete_path)):
    pass

if __name__ == "__main__":
    app = Typer(add_completion=True)
    app.command()(single)
    app()

Description

As the example mentions, autocomplete for paths or files depends on the text cursor not moving. Whenever you try to autocomplete a typer.Argument, except the first time (before you write anything and incomplete is empty), even if you return a empty list you get a space added to the end. If you do that (return a empty list) in a Option shell_complete function, it instead fall-backs to the cmd line path autocomplete correctly, with no space added which allows autocomplete to function.

I don't get this inconsistency. Actually it might not even be adding the autocomplete to the argument, because i just printed something there and nothing happened.

I added the autocomplete in a attempt to workaround this behavior, which is the default.

edit: shell_complete doesn't work as a argument to ... Argument, but autocompletion=complete_path does. In that case, the program doesn't add a space at the end and it works as expected.

Operating System

Linux

Operating System Details

No response

Typer Version

0.9.0

Python Version

Python 3.10.6

Additional Context

No response

[i30817]

Maybe it's on purpose that any path is considered 'complete' even paths that don't exist? If so, maybe specifying exists=True could modify that?

[maszczyn]

I don't think it's related to exists flag. This flag is taken from Click, which Typer uses a lot to handle the CLI, including shell completions, and as far as I checked, Click completes File & Path arguments as expected, even with the default of exists=False. I think your issue might be related to what I observed and started a discussion for.

[i30817]

I'd forgotten this issue. What I ended up doing is use the empty list autocompletition for 'can be anywhere' file Arguments (works if open quotes before trying) and shell_complete for file options I already knew all possibilities for (fixed directory given access to the first argument or its default).

I don't think there is anything wrong specifically, except autocompletition and shell_complete doing different things in spite of being called equivalent in the documentation (I used autocompletion for the file argument and shell_complete for the option arguments). And maybe the default for files completion being buggy and adding a space to any 'completion' instead of trying to complete without that trick (and not working without a opening quote if the path has spaces).