fix: fix Literal with widget_type

[tlambert03]

fixes #585 where providing widget_type didn't get to the parsing of Literal

Summary by CodeRabbit

• New Feature: Enhanced support for Literal type annotations in the magicgui type map. The update introduces a function that correctly extracts choices and nullable flags from Literal types, improving the accuracy of widget selection.
• Test: Added a new test case test_pick_widget_literal() to ensure the correct widget class is returned for Literal annotations and that the choices are accurately extracted.

[coderabbitai]

Walkthrough

This change introduces a new function to handle Literal type annotations in the magicgui type map. It refactors existing logic for cleaner code and adds a test case to verify the correct widget selection and choice extraction from Literal annotations.

Changes

File	Summary
src/magicgui/type_map/...	Introduced _literal_choices function to extract choices and nullable flag from Literal type annotation. Refactored match_type and _pick_widget_type functions for cleaner handling of Literal types.
tests/test_types.py	Added test_pick_widget_literal() test case to verify correct widget class selection and choice extraction from Literal annotations.

🐇💻

In the land of code, where the brackets lie,
A rabbit hopped forth, with a twinkle in its eye.
"A Literal here, a Literal there,
With my new function, I handle them with care.
Now the code is clean, the tests are green,
Oh, what a wonderful coding scene!" 🎉🥕

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[coderabbitai]

Review Status

Actionable comments generated: 0

Commits

Files that changed from the base of the PR and between b82b3c8 and f9b8901.

Files selected for processing (2)

• src/magicgui/type_map/_type_map.py (3 hunks)
• tests/test_types.py (1 hunks)

Files skipped from review due to trivial changes (1)

• src/magicgui/type_map/_type_map.py

Additional comments (Suppressed): 1

tests/test_types.py (1)

• 192-199: The new test case test_pick_widget_literal() is well written and covers the changes made in the type map file. It checks whether the correct widget class (widgets.RadioButtons) is returned for a Literal annotation and whether the choices are correctly extracted from the Literal annotation. This addition enhances the test coverage for the changes made in the type map file.

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (b82b3c8) 87.61% compared to head (f9b8901) 87.61%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #586   +/-   ##
=======================================
  Coverage   87.61%   87.61%           
=======================================
  Files          39       39           
  Lines        4528     4538   +10     
=======================================
+ Hits         3967     3976    +9     
- Misses        561      562    +1     

Files Changed	Coverage Δ
src/magicgui/type_map/_type_map.py	96.15% <100.00%> (-0.28%)	⬇️

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