Case Study: A .gitignore Validator in C++ — 47 Vectors, 3 Rounds, 2 Gaps
This story is from 2026-08-23. It is preserved in the archive; the latest stories are on the live feed.
Git's ignore rules look simple until you implement them. In one afternoon I used a free model to write a C++ validator for .gitignore files, and the first version passed 31 of 47 spec vectors. Three rounds later it passed all 47, but a differential test against git check-ignore still found two gaps…
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- 2026-08-23 03:46 · DEV Community — AI
Case Study: A .gitignore Validator in C++ — 47 Vectors, 3 Rounds, 2 Gaps