Include file paths in --diff output to enable patch -p0 application

[Copilot]

--diff output lacked fromfile/tofile headers in the unified diff, making it unusable with patch.

Changes

• print_diff: Added file_path: pathlib.Path parameter; passes a cwd-relative path (falling back to absolute) as both fromfile and tofile in difflib.unified_diff
• apply_changes: Threads file_path through to print_diff

Result

--- tests/classes/kw_only_test.py
+++ tests/classes/kw_only_test.py
@@ -10,3 +10,11 @@
         """Initialize the class."""
         self.name = name  # pragma: no cover
         self.age = age  # pragma: no cover
+
+    def __repr__(self) -> str:
...

The output can now be applied directly:

crepr add tests/classes/*.py --diff > changes.patch
patch -p0 < changes.patch

[semanticdiff-com]

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Changed Files

File	Status
crepr/crepr.py	61% smaller