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https://github.com/numtide/flake-utils.git
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5466c5bbec
Since Flake resolves both namespaces, and legacyPackages is more forgiving, use that and not deal with the subtle differences.
81 lines
1.7 KiB
Nix
81 lines
1.7 KiB
Nix
{ lib }:
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# This function returns a flake outputs-compatible schema.
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{
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# pass an instance of self
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self
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, # pass an instance of the nixpkgs flake
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nixpkgs
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, # we assume that the name maps to the project name, and also that the
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# overlay has an attribute with the `name` prefix that contains all of the
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# project's packages.
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name
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, # nixpkgs config
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config ? { }
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, # pass either a function or a file
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overlay ? null
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, # use this to load other flakes overlays to supplement nixpkgs
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preOverlays ? [ ]
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, # maps to the devShell output. Pass in a shell.nix file or function.
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shell ? null
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, # pass the list of supported systems
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systems ? [ "x86_64-linux" ]
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}:
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let
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loadOverlay = obj:
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if obj == null then
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[ ]
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else
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[ (maybeImport obj) ]
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;
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maybeImport = obj:
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if (builtins.typeOf obj == "path") || (builtins.typeOf obj == "string") then
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import obj
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else
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obj
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;
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overlays = preOverlays ++ (loadOverlay overlay);
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shell_ = maybeImport shell;
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outputs = lib.eachSystem systems (system:
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let
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pkgs = import nixpkgs {
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inherit
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config
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overlays
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system
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;
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};
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packages = pkgs.${name} or { };
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in
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{
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# Use the legacy packages since it's more forgiving.
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legacyPackages = packages;
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}
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//
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(
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if packages ? defaultPackage then {
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defaultPackage = packages.defaultPackage;
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} else { }
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)
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//
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(
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if packages ? checks then {
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checks = packages.checks;
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} else { }
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)
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//
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(
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if shell != null then {
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devShell = shell_ { inherit pkgs; };
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} else if packages ? devShell then {
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devShell = packages.devShell;
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} else { }
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)
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);
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in
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outputs
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