devos/lib/attrs.nix

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{ lib, ... }:
rec {
# mapFilterAttrs ::
# (name -> value -> bool )
# (name -> value -> { name = any; value = any; })
# attrs
mapFilterAttrs = seive: f: attrs:
lib.filterAttrs
seive
(lib.mapAttrs' f attrs);
# Generate an attribute set by mapping a function over a list of values.
genAttrs' = values: f: lib.listToAttrs (map f values);
# Convert a list of file paths to attribute set where
# the key is the folder or filename stripped of nix
# extension and imported content of the file as value.
#
pathsToImportedAttrs = paths:
let
paths' = lib.filter
(path: lib.hasSuffix ".nix" path
|| lib.pathExists "${path}/default.nix")
paths;
in
genAttrs' paths' (path: {
name = lib.removeSuffix ".nix"
# Safe as long this is just used as a name
(builtins.unsafeDiscardStringContext (baseNameOf path));
value = import path;
});
concatAttrs = lib.fold (attr: sum: lib.recursiveUpdate sum attr) { };
# Filter out packages that support given system and follow flake check requirements
filterPackages = system: packages:
let
# Everything that nix flake check requires for the packages output
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);
in
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lib.filterAttrs filter packages;
safeReadDir = path: lib.optionalAttrs (builtins.pathExists path) (builtins.readDir path);
}