From 0906cdb433fe5b8c67c2956c475a9b6d340a260f Mon Sep 17 00:00:00 2001
From: tv <tv@krebsco.de>
Date: Sat, 25 Jul 2015 02:14:44 +0200
Subject: {3 -> 4} krebs {listset,tree}

---
 4lib/krebs/default.nix | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

(limited to '4lib')

diff --git a/4lib/krebs/default.nix b/4lib/krebs/default.nix
index 0c59076..0c42a5d 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;
+
 }
-- 
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