40 lines
1.3 KiB
Nix
40 lines
1.3 KiB
Nix
lib: _: {
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overlays = {
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runOverlay = do: final: prev: do {
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inherit final prev;
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util = {
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callPackageOrTuple = input:
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if lib.isList input then
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assert lib.length input == 2; let
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pkg = lib.head input;
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args = lib.last input;
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in final.callPackage pkg args
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else
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final.callPackage input { };
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};
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};
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callManyPackages = packages: lib.overlays.runOverlay ({ util, ... }:
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let
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packages' = lib.listToAttrs (map (x: lib.nameValuePair (baseNameOf x) x) packages);
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in
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lib.mapAttrs (lib.const util.callPackageOrTuple) packages'
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);
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applyOverlays = packageSet: overlays: let
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combinedOverlay = lib.composeManyExtensions overlays;
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in
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# regular extensible package set
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if packageSet ? extend then
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packageSet.extend combinedOverlay
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# makeScope-style package set, this case needs to be handled before makeScopeWithSplicing
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else if packageSet ? overrideScope' then
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packageSet.overrideScope' combinedOverlay
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# makeScopeWithSplicing-style package set
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else if packageSet ? overrideScope then
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packageSet.overrideScope combinedOverlay
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else
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throw "don't know how to extend the given package set";
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};
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}
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