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flake: use builtins.fetchTree to shallow-clone grammar repos

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Here we perform a shallow fetch using builtins.fetchTree. In order
to make this work, we need to specify the `ref' for any repository
that doesn't have `master' as its default branch (I'm not sure why
this limitation exists since we don't need this when performing
the shallow fetch in `--grammar build')

This `ref' field is ignored by helix, so I have left it undocumented
for now, but I could be open to documenting it.
This commit is contained in:
Michael Davis 2022-03-09 08:34:52 -06:00 • committed by Blaž Hrastnik
parent 7044d7d804
commit e01c53551d
4 changed files with 22 additions and 47 deletions
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6
grammars.nix
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@ -13,10 +13,12 @@ let
gitGrammars = builtins.filter isGitGrammar languagesConfig.grammar;
buildGrammar = grammar:
let
source = builtins.fetchGit {
source = builtins.fetchTree {
type = "git";
url = grammar.source.git;
rev = grammar.source.rev;
allRefs = true;
ref = grammar.source.ref or "HEAD";
shallow = true;
};
in stdenv.mkDerivation rec {
# see https://github.com/NixOS/nixpkgs/blob/fbdd1a7c0bc29af5325e0d7dd70e804a972eb465/pkgs/development/tools/parsing/tree-sitter/grammar.nix