modules/nixpkgs: add overlays option

Based on the `nixpkgs.overlays` option available in NixOS, allows users
to further customize the `pkgs` instance used when evaluating nixvim.

The standard module tests are now provided a few extra module args to
enable a test where we instantiate a custom nixpkgs instance.
This commit is contained in:
Matt Sturgeon 2024-10-17 18:55:05 +01:00
parent b9d17d5e6c
commit c4ad4d0b2e
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3 changed files with 152 additions and 1 deletions

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@ -0,0 +1,74 @@
{
# TODO: expect not setting `nixpkgs.pkgs` to throw
overlays =
{ pkgs, ... }:
{
test.runNvim = false;
nixpkgs.overlays = [
(final: prev: {
foobar = "foobar";
})
];
assertions = [
{
assertion = pkgs.foobar or null == "foobar";
message = ''
Expected `pkgs.foobar` to be "foobar"
'';
}
];
};
# Test that overlays from both `nixpkgs.pkgs` _and_ `nixpkgs.overlays` are applied
stacked_overlays =
{
inputs,
system,
pkgs,
...
}:
{
test.runNvim = false;
nixpkgs.pkgs = import inputs.nixpkgs {
inherit system;
overlays = [
(final: prev: {
foobar = "foobar";
conflict = "a";
})
];
};
nixpkgs.overlays = [
(final: prev: {
hello = "world";
conflict = "b";
})
];
assertions = [
{
assertion = pkgs.foobar or null == "foobar";
message = ''
Expected `pkgs.foobar` to be "foobar"
'';
}
{
assertion = pkgs.hello or null == "world";
message = ''
Expected `pkgs.hello` to be "world"
'';
}
{
assertion = pkgs.conflict or null == "b";
message = ''
Expected `pkgs.conflict` to be "b"
'';
}
];
};
}