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nixpkgs/pkgs/build-support/nix-gitignore
adisbladis ef3ed45c12
nix-gitignore: Optimise performance
There are a few operations in this library that naively runs on every
iteration while they could be cached.

For a simple test repository with a small number of files and ~1000
gitignore patterns this brings memory usage down from ~233M to ~157M
and wall time from 2.6s down to 0.78s.

This should scale similarly with the number of files in a repository.
2020-12-07 14:14:20 +01:00
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default.nix