forked from mirrors/nixpkgs
28 lines
1.1 KiB
Nix
28 lines
1.1 KiB
Nix
let inherit (import ../attrsets.nix) mapAttrs; in
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rec {
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doubles = import ./doubles.nix;
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parse = import ./parse.nix;
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inspect = import ./inspect.nix;
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platforms = import ./platforms.nix;
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# Elaborate a `localSystem` or `crossSystem` so that it contains everything
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# necessary.
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#
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# `parsed` is inferred from args, both because there are two options with one
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# clearly prefered, and to prevent cycles. A simpler fixed point where the RHS
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# always just used `final.*` would fail on both counts.
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elaborate = args: let
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final = {
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# Prefer to parse `config` as it is strictly more informative.
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parsed = parse.mkSystemFromString (if args ? config then args.config else args.system);
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# Either of these can be losslessly-extracted from `parsed` iff parsing succeeds.
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system = parse.doubleFromSystem final.parsed;
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config = parse.tripleFromSystem final.parsed;
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# Just a guess, based on `system`
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platform = platforms.selectBySystem final.system;
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} // mapAttrs (n: v: v final.parsed) inspect.predicates
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// args;
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in final;
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}
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