32 lines
739 B
Nix
32 lines
739 B
Nix
{ lib, ... }:
|
|
|
|
let
|
|
listset = import ./listset.nix { inherit lib; };
|
|
in
|
|
|
|
with builtins;
|
|
with lib;
|
|
|
|
rec {
|
|
# label = string
|
|
|
|
# TODO does it make sense to have alias = list label?
|
|
|
|
# split-by-provider :
|
|
# [[label]] -> tree label provider -> listset provider alias
|
|
split-by-provider = as: providers:
|
|
foldl (m: a: listset.insert (provider-of a providers) a m) {} as;
|
|
|
|
# provider-of : alias -> tree label provider -> provider
|
|
# Note that we cannot use tree.get here, because path can be longer
|
|
# than the tree depth.
|
|
provider-of = a:
|
|
let
|
|
go = path: tree:
|
|
if typeOf tree == "string"
|
|
then tree
|
|
else go (tail path) tree.${head path};
|
|
in
|
|
go (reverseList (splitString "." a));
|
|
}
|