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-rw-r--r--4lib/krebs/default.nix18
1 files changed, 18 insertions, 0 deletions
diff --git a/4lib/krebs/default.nix b/4lib/krebs/default.nix
index 0c59076b6..0c42a5de3 100644
--- a/4lib/krebs/default.nix
+++ b/4lib/krebs/default.nix
@@ -12,4 +12,22 @@ builtins // lib // rec {
types = import ./types.nix { inherit lib; };
+
+ # listset k v = set k [v]
+
+ # listset-insert : k -> v -> listset k v -> listset k v
+ listset-insert = name: value: set:
+ set // { ${name} = set.${name} or [] ++ [value]; };
+
+ # tree k v = set k (either v (tree k v))
+
+ # tree-get : [k] -> tree k v -> v
+ tree-get = path: x:
+ let
+ y = x.${last path};
+ in
+ if typeOf y != "set"
+ then y
+ else tree-get (init path) y;
+
}