nixos/fn.nix

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{ lib }:
with builtins;
with lib;
rec {
ifelse = a: b: c: if a then b else c;
fileContentsOr = a: b: (ifelse
(pathIsRegularFile a)
a b);
cwd = toString ./.;
lst = { p ? cwd, t ? "regular", b ? false }: (lists.forEach
(attrNames
(filterAttrs (n: v: v == t)
(readDir p)))
(v: ((optionalString b "${p}/") + v)));
lsf = p: (lst { p = p; });
lsd = p: (lst { p = p; t = "directory"; b = true; });
lsfRec = p: b: flatten ((map (np: lsfRec np b) (lsd p)) ++ (lst { p = p; b = b; }));
}