[BUG] help line length miscalculated when using stylized text

[zmeir]

Discussed in #1101

^{Originally posted by zmeir December 23, 2024}

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Example Code

from typing import Annotated

import typer


app = typer.Typer()


@app.command()
def example(
    a: Annotated[str, typer.Option(help="This is A")],
    b: Annotated[str, typer.Option(help=f"This is {typer.style('B', underline=True)}")],
):
    pass


if __name__ == "__main__":
    app()

Description

When using typer.style in the help text of a command option, the rightmost | in the "frame" of the Options output is misaligned. This seems to be due to a miscalculation of the help line length, caused by the invisible style characters.

Using the example script - run python example.py --help and you should get this output:

(highlighted the misaligned part)

Operating System

macOS

Operating System Details

macOS version: 13.7.1 (22H221)

Typer Version

0.15.1

Python Version

3.10.13

Additional Context

No response