typer ✨ Implement list parsing from string with separators.

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:

[x] Add to doc_src
[x] Write tests
[x] Update documentation

Apr 17 '24 22:04 libklein

📝 Docs preview for commit 7eb3fd2c04bcd5ff34aecb1ce83a6f786d1a0f95 at: https://d9b28bcb.typertiangolo.pages.dev

Apr 17 '24 22:04 github-actions[bot]

📝 Docs preview for commit cec52c953e60c29e8fac466b9a604295a71fcb31 at: https://0ff1aa3c.typertiangolo.pages.dev

Apr 17 '24 22:04 github-actions[bot]

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

Apr 18 '24 08:04 svlandeg

📝 Docs preview for commit aca33a5cb1cd8491cba785fd8acaf98855869057 at: https://d79559eb.typertiangolo.pages.dev