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17
doc/languages-frameworks/nim.section.md
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@ -50,7 +50,20 @@ $ nix build -f . ttop.src
$ nix run -f . nim_lk ./result | jq --sort-keys > pkgs/by-name/tt/ttop/lock.json
```
## Lockfile dependency overrides {#nimoverrides}
## Overriding Nim packages {#nim-overrides}
The `buildNimPackage` function generates flags and additional build dependencies from the `lockFile` parameter passed to `buildNimPackage`. Using [`overrideAttrs`](#sec-pkg-overrideAttrs) on the final package will apply after this has already been generated, so this can't be used to override the `lockFile` in a package built with `buildNimPackage`. To be able to override parameters before flags and build dependencies are generated from the `lockFile`, use `overrideNimAttrs` instead with the same syntax as `overrideAttrs`:
```nix
pkgs.nitter.overrideNimAttrs {
# using a different source which has different dependencies from the standard package
src = pkgs.fetchFromGithub { /* … */ };
# new lock file generated from the source
lockFile = ./custom-lock.json;
}
```
## Lockfile dependency overrides {#nim-lock-overrides}
The `buildNimPackage` function matches the libraries specified by `lockFile` to attrset of override functions that are then applied to the package derivation.
The default overrides are maintained as the top-level `nimOverrides` attrset at `pkgs/top-level/nim-overrides.nix`.
@ -81,7 +94,7 @@ The annotations in the `nim-overrides.nix` set are functions that take three arg
- finalAttrs: the final attrset passed by `buildNimPackage` to `stdenv.mkDerivation`.
- prevAttrs: the attrset produced by initial arguments to `buildNimPackage` and any preceding lockfile overlays.
### Overriding an Nim library override {#nimoverrides-overrides}
### Overriding an Nim library override {#nim-lock-overrides-overrides}
The `nimOverrides` attrset makes it possible to modify overrides in a few different ways.