First Check

• I added a very descriptive title to this issue.
• I used the GitHub search to find a similar issue and didn't find it.
• I searched the Typer documentation, with the integrated search.
• I already searched in Google "How to X in Typer" and didn't find any information.
• I already read and followed all the tutorial in the docs and didn't find an answer.
• I already checked if it is not related to Typer but to Click.

Commit to Help

• I commit to help with one of those options 👆

Example Code

import typer

valid_names = ["Camila", "Carlos", "Sebastian"]


def complete_name(incomplete: str):
    completion = []
    for name in valid_names:
        if name.startswith(incomplete):
            completion.append(name)
    return completion


def main(
    name: str = typer.Option(
        "World", help="The name to say hi to.", autocompletion=complete_name
    )
):
    typer.echo(f"Hello {name}")


if __name__ == "__main__":
    typer.run(main)

Description

The intro example from the documentation fails in powershell if you start an incomplete name. For example typer ./main.py run --name Ca[TAB][TAB] fails to suggest completions, tho typer ./main.py run --name [TAB][TAB] does.

The powershell completion set args to the full list of arguments including the incomplete word, e.g. args = ['--name', 'Ca'], incomplete='Ca' unlike the bash completion which drops the incomplete word, e.g. args = ['--name'], incomplete='Ca'.

It looks straightforward to use the $cursorPosition
variable to figure out where to truncate the string and take all but the last arg up to that point. I'll experiment and make a PR.

Operating System

Windows

Operating System Details

Windows 11, powershell 7

Typer Version

0.4.0

Python Version

3.7.12

Additional Context

No response