From 0a5548c379a373157448c3b3798073c6d426033b Mon Sep 17 00:00:00 2001
From: tv <tv@shackspace.de>
Date: Sat, 25 Jul 2015 02:14:44 +0200
Subject: {3 -> 4} krebs {listset,tree}

---
 3modules/krebs/default.nix | 19 ++-----------------
 4lib/krebs/default.nix     | 18 ++++++++++++++++++
 2 files changed, 20 insertions(+), 17 deletions(-)

diff --git a/3modules/krebs/default.nix b/3modules/krebs/default.nix
index 43e7e4c5..33c10881 100644
--- a/3modules/krebs/default.nix
+++ b/3modules/krebs/default.nix
@@ -68,27 +68,12 @@ let
             de.krebsco = "ovh";
           };
 
-          # splitByProvider : [alias] -> set providername [alias]
-          splitByProvider = foldl (acc: alias: insert (providerOf alias) alias acc) {};
+          # splitByProvider : [alias] -> listset providername alias
+          splitByProvider = foldl (acc: alias: listset-insert (providerOf alias) alias acc) {};
 
           # providerOf : alias -> providername
           providerOf = alias:
             tree-get (splitString "." alias) providers;
-
-          # insert : k -> v -> set k [v] -> set k [v]
-          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;
         in
         concatStringsSep "\n" (flatten (
           # TODO deepMap ["hosts" "nets"] (hostname: host: netname: net:
diff --git a/4lib/krebs/default.nix b/4lib/krebs/default.nix
index 0c59076b..0c42a5de 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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