flake-utils/filterPackages.nix

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system: packages:
let
# Adopted from nixpkgs.lib
inherit (builtins) listToAttrs concatMap attrName;
nameValuePair = name: value: { inherit name value; };
filterAttrs = pred: set:
listToAttrs (
concatMap (name:
let v = set.${name}; in
if pred name v then [(nameValuePair name v)] else []
)
(attrNames set)
);
# Everything that nix flake check requires for the packages output
sieve = n: v:
with v;
let
inherit (builtins) isAttrs;
isDerivation = x: isAttrs x && x ? type && x.type == "derivation";
platforms = meta.hydraPlatforms or meta.platforms or [ ];
in
# check for isDerivation, so this is independently useful of
# flattenTree, which also does filter on derviations
isDerivation v && !meta.broken && builtins.elem system platforms
;
in
filterAttrs sieve packages