be924bcb27
for clarity's sake, expose which function uses final and prev, so that
people can have a clearer understanding how they relate to each other
in terms of dependencies.
also a simple `{ lib = final; }` probably does not warrant a complete
callLibs obscurization.
45 lines
1.5 KiB
Nix
45 lines
1.5 KiB
Nix
{ lib }:
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rec {
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# mapFilterAttrs ::
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# (name -> value -> bool )
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# (name -> value -> { name = any; value = any; })
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# attrs
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mapFilterAttrs = seive: f: attrs:
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lib.filterAttrs
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seive
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(lib.mapAttrs' f attrs);
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# Generate an attribute set by mapping a function over a list of values.
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genAttrs' = values: f: lib.listToAttrs (map f values);
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# Convert a list of file paths to attribute set where
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# the key is the folder or filename stripped of nix
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# extension and imported content of the file as value.
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#
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pathsToImportedAttrs = paths:
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let
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paths' = lib.filter
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(path: lib.hasSuffix ".nix" path
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|| lib.pathExists "${path}/default.nix")
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paths;
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in
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genAttrs' paths' (path: {
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name = lib.removeSuffix ".nix"
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# Safe as long this is just used as a name
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(builtins.unsafeDiscardStringContext (baseNameOf path));
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value = import path;
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});
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concatAttrs = lib.fold (attr: sum: lib.recursiveUpdate sum attr) { };
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# Filter out packages that support given system and follow flake check requirements
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filterPackages = system: packages:
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let
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# Everything that nix flake check requires for the packages output
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filter = (n: v: with v; let platforms = meta.hydraPlatforms or meta.platforms or [ ]; in
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lib.isDerivation v && !meta.broken && builtins.elem system platforms);
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in
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lib.filterAttrs filter packages;
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safeReadDir = path: lib.optionalAttrs (builtins.pathExists path) (builtins.readDir path);
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}
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