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-rw-r--r--4lib/krebs/default.nix21
-rw-r--r--4lib/krebs/dns.nix31
-rw-r--r--4lib/krebs/listset.nix11
-rw-r--r--4lib/krebs/tree.nix13
4 files changed, 58 insertions, 18 deletions
diff --git a/4lib/krebs/default.nix b/4lib/krebs/default.nix
index 0c42a5de3..b67585335 100644
--- a/4lib/krebs/default.nix
+++ b/4lib/krebs/default.nix
@@ -12,22 +12,7 @@ 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.${last path};
- in
- if typeOf y != "set"
- then y
- else tree-get (init path) y;
-
+ dns = import ./dns.nix { inherit lib; };
+ listset = import ./listset.nix { inherit lib; };
+ tree = import ./tree.nix { inherit lib; };
}
diff --git a/4lib/krebs/dns.nix b/4lib/krebs/dns.nix
new file mode 100644
index 000000000..b2cf3c24c
--- /dev/null
+++ b/4lib/krebs/dns.nix
@@ -0,0 +1,31 @@
+{ lib, ... }:
+
+let
+ listset = import ./listset.nix { inherit lib; };
+in
+
+with builtins;
+with lib;
+
+rec {
+ # label = string
+
+ # TODO does it make sense to have alias = list label?
+
+ # split-by-provider :
+ # [[label]] -> tree label provider -> listset provider alias
+ split-by-provider = as: providers:
+ foldl (m: a: listset.insert (provider-of a providers) a m) {} as;
+
+ # provider-of : alias -> tree label provider -> provider
+ # Note that we cannot use tree.get here, because path can be longer
+ # than the tree depth.
+ provider-of = a:
+ let
+ go = path: tree:
+ if typeOf tree == "string"
+ then tree
+ else go (tail path) tree.${head path};
+ in
+ go (reverseList (splitString "." a));
+}
diff --git a/4lib/krebs/listset.nix b/4lib/krebs/listset.nix
new file mode 100644
index 000000000..3aae22f20
--- /dev/null
+++ b/4lib/krebs/listset.nix
@@ -0,0 +1,11 @@
+{ lib, ... }:
+
+with lib;
+
+rec {
+ # listset k v = set k [v]
+
+ # insert : k -> v -> listset k v -> listset k v
+ insert = name: value: set:
+ set // { ${name} = set.${name} or [] ++ [value]; };
+}
diff --git a/4lib/krebs/tree.nix b/4lib/krebs/tree.nix
new file mode 100644
index 000000000..1cd83b3f6
--- /dev/null
+++ b/4lib/krebs/tree.nix
@@ -0,0 +1,13 @@
+{ lib, ... }:
+
+with lib;
+
+rec {
+ # tree k v = set k (either v (tree k v))
+
+ # get : [k] -> tree k v -> v
+ get = path: tree:
+ if length path > 0
+ then get (tail path) tree.${head path} # TODO check if elem exists
+ else tree;
+}