✨ Implement list parsing from string with separators.

[libklein]

Implements feature #554.

This merge request introduces the functionality to parse List[T] options from strings using a specified separator. An example of how this can be utilized is demonstrated below:

def main(number: List[float] = typer.Option([], multiple_separator=",")):
    print(f"The sum is {sum(number)}")

#  Passing --number 1,2,3 outputs 6  
#  Works with --number 1,2 --number 3 as well. Output would be 6 again.

The implementation works by overwriting the process_value function of the click parser, doing string splitting before forwarding the result to click. This ensures full compatibility with the existing features of both Click and Typer. The feature does not allow whitespace only separators to avoid ambiguities.

Feedback is much appreciated!

Open questions:

• Currently, error handling is implemented in the constructor of typer.Option, which delays error detection until the command execution. Should we consider moving this error handling to the OptionInfo constructor to allow for earlier failure detection?
  ToDo:

• Add to doc_src
• Write tests
• Update documentation

[github-actions]

📝 Docs preview for commit 7eb3fd2 at: https://d9b28bcb.typertiangolo.pages.dev

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📝 Docs preview for commit cec52c9 at: https://0ff1aa3c.typertiangolo.pages.dev

[svlandeg]

Hi, thanks for your PR! I'll put this in draft as long as the test suite is failing.

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[ivantodorovich]

Thanks 💚

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[svlandeg]

Hi, thanks for the PR! It's really well written, with the appropriate changes and additions to the documentation, example code and unit tests. Really appreciated 🙏

I pushed a few smaller edits to update the documentation as well as pointing out that it does in fact work without quotes, as long as there is no whitespace inbetween, e.g.

python main.py --number 2,3,4.5

The PR looks good to merge to me, but I defer to Tiangolo for the final decision.

[github-actions]

📝 Docs preview for commit de078a6 at: https://e3977423.typertiangolo.pages.dev

Modified Pages

• https://e3977423.typertiangolo.pages.dev/tutorial/multiple-values/multiple-options/

[libklein]

Is there anything I can contribute?

[svlandeg]

At this point the PR is in a good shape to be reviewed by Tiangolo - we've got this on our internal board for him to review when he has time 😉 Thanks for your patience!

[github-actions]

📝 Docs preview for commit 92a6d81 at: https://b1168530.typertiangolo.pages.dev

Modified Pages

• https://b1168530.typertiangolo.pages.dev/tutorial/multiple-values/multiple-options/

[github-actions]

📝 Docs preview for commit d5328fa at: https://2b5a4b04.typertiangolo.pages.dev

Modified Pages

• https://2b5a4b04.typertiangolo.pages.dev/tutorial/multiple-values/multiple-options/

[dylankiss]

This would be great! Much more convenient to pass a large number of elements to an option 💯
Nice job, @libklein. Hope it will be merged soon 🙏