fix: handle parsing deleted, added empty files

[yeonjuan]

refs #31

[Copilot]

Pull Request Overview

This PR improves parse-git-diff to correctly handle added or deleted empty files by capturing their paths from the diff header and adjusting the generation logic.

• Extracts source and target paths using a new comparison-line parser
• Updates deleted/new file branches to prefer header paths over change markers or chunk data
• Adds fixtures and snapshot tests for renamed, added, and deleted empty files

Reviewed Changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
src/parse-git-diff.ts	Introduced pasreComparisonInputLine, updated how empty-file paths are captured and handled
src/tests/renamed-empty.test.ts	Added snapshot test for renamed-empty fixture
src/tests/renamed-empty-file.test.ts	Duplicate test for renamed-empty scenario (potential redundancy)
src/tests/deleted-empty-file.test.ts	Added snapshot test for deleted-empty-file scenario
src/tests/added-empty-file.test.ts	Added snapshot test for added-empty-file scenario
src/fixtures/renamed-empty	Fixture for renamed-empty diff
src/fixtures/deleted-empty-file	Fixture for deleted-empty-file diff
src/fixtures/added-empty-file	Fixture for added-empty-file diff

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.55%. Comparing base (e8ed56d) to head (1fdb2f5).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #37      +/-   ##
==========================================
+ Coverage   98.46%   98.55%   +0.08%     
==========================================
  Files           4        4              
  Lines         196      208      +12     
  Branches       60       62       +2     
==========================================
+ Hits          193      205      +12     
  Misses          2        2              
  Partials        1        1              

Flag	Coverage Δ
unittest	98.55% <100.00%> (+0.08%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
src/parse-git-diff.ts	98.38% <100.00%> (+0.11%)	⬆️

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