types: Add StrPath typing, fix new_session, part 2

[tony]

I'm making mistakes, but follow up to #597, #596

Summary

This PR adds uniform StrPath type support for start_directory parameters across all methods in libtmux, enabling PathLike objects (like pathlib.Path) to be used alongside strings.

Changes Made

Type Annotations Updated

• Server.new_session: start_directory: str | None → start_directory: StrPath | None
• Session.new_window: start_directory: str | None → start_directory: StrPath | None
• Pane.split and Pane.split_window: start_directory: str | None → start_directory: StrPath | None
• Window.split and Window.split_window: start_directory: str | None → start_directory: StrPath | None

Implementation Details

• Added StrPath import to all affected modules
• Updated docstrings to reflect "str or PathLike" support
• Standardized logic patterns using if start_directory: (not if start_directory is not None:) to properly handle empty strings
• Added path expansion logic with pathlib.Path(start_directory).expanduser() for proper tilde expansion

Testing

• Added comprehensive parametrized tests for all affected methods
• Test cases cover: None, empty string, absolute path string, and pathlib.Path objects
• Added separate pathlib-specific tests using temporary directories
• Tests verify operations complete successfully with all input types
• Integrated tests into existing test files following project conventions

Files Modified

• src/libtmux/server.py
• src/libtmux/session.py
• src/libtmux/pane.py
• src/libtmux/window.py
• tests/test_server.py
• tests/test_session.py
• tests/test_pane.py
• tests/test_window.py

Benefits

• Improved Developer Experience: Users can now pass pathlib.Path objects directly without converting to strings
• Type Safety: Better type annotations that accurately reflect accepted input types
• Consistency: Uniform pattern across all start_directory parameters in the codebase
• Backward Compatibility: Existing string-based code continues to work unchanged

Testing Results

• All linting (ruff), formatting, and type checking (mypy) passed
• All 20 new start_directory tests passed (16 parametrized + 4 pathlib-specific)
• Full test suite continues to pass

Fixes typing inconsistencies and enhances usability for path-related parameters throughout libtmux.

Summary by Sourcery

Update StrPath documentation and enhance Session.new_window to better handle start_directory values

Enhancements:

• Simplify StrPath docstring by removing outdated StrOrBytesPath mention
• Relax start_directory check in Session.new_window to apply expanduser for any truthy path-like value

[sourcery-ai]

Reviewer's Guide

This PR refines the internal type documentation by focusing solely on the new StrPath alias and simplifies the session startup logic by dropping the explicit string type check in favor of a truthiness check, allowing broader path-like inputs to be handled by pathlib.

Updated class diagram for the Session class

classDiagram
  class Session {
    +new_window(..., start_directory: StrPath | None, ...): Window
  }

Loading

File-Level Changes

Change	Details	Files
Updated type documentation to remove redundant reference and align with the new StrPath definition	Removed mention of StrOrBytesPath from the module docstring Simplified doc comment to reference only StrPath based on typeshed	src/libtmux/_internal/types.py
Simplified start_directory handling in new_window to accept any truthy path-like object	Replaced if start_directory and isinstance(start_directory, str) with if start_directory Delegated all input types to pathlib.Path.expanduser() for consistent path expansion	src/libtmux/session.py

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.30%. Comparing base (e58766a) to head (8483a5b).
Report is 13 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #598      +/-   ##
==========================================
+ Coverage   79.84%   80.30%   +0.45%     
==========================================
  Files          23       23              
  Lines        1915     1919       +4     
  Branches      294      294              
==========================================
+ Hits         1529     1541      +12     
+ Misses        266      261       -5     
+ Partials      120      117       -3     

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[sourcery-ai]

Hey @tony - I've reviewed your changes and they look great!

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Documentation: all looks good

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