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Memoize perSystem in allSystems, require devShell

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This commit is contained in:
Robert Hensing 2021-11-22 22:01:38 +01:00
parent d5703798a8
commit 1b82c7f771
6 changed files with 20 additions and 18 deletions
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15
modules/perSystem.nix
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@ -1,6 +1,7 @@
{ config, lib, self, ... }:
let
inherit (lib)
genAttrs
mapAttrs
mkOption
types
@ -36,7 +37,19 @@ in
shorthandOnlyDefinesConfig = false;
});
};
allSystems = mkOption {
type = types.lazyAttrsOf types.unspecified;
description = "The system-specific config for each of systems.";
internal = true;
};
};
config = {
perSystem = system: { _module.args.system = system; };
allSystems = genAttrs config.systems config.perSystem;
# TODO: Sub-optimal error message. Get Nix to support a memoization primop, or get Nix Flakes to support systems properly or get Nix Flakes to add a name to flakes.
_module.args.getSystem = system: config.allSystems.${system} or builtins.trace "using non-memoized system ${system}" config.perSystem system;
};
config.perSystem = system: { _module.args.system = system; };
}