lib: implement as overlay

This uses fully the ability to overlay the nixpkgs library instead of
doing that hackilly.

1 files changed, 23 insertions, 28 deletions

diff --git a/lib/default.nix b/lib/default.nix
index 3f14de0..76eb693 100644
--- a/lib/default.nix
+++ b/lib/default.nix
@@ -1,30 +1,25 @@
-nixpkgslib: let
-  lib = nixpkgslib // nlib;
+final: _:
+with final; {
+  # Generic power of number
+  pow = base: e:
+    if e == 0
+    then 1
+    else foldl (x: _: x * base) 1 (genList id (e - 1));
+  # Power of 2
+  pow2 = pow 2;
 
-  nlib = with builtins;
-  with lib; {
-    # Generic power of number
-    pow = base: e:
-      if e == 0
-      then 1
-      else foldl (x: _: x * base) 1 (genList id (e - 1));
-    # Power of 2
-    pow2 = pow 2;
+  # Convert integer to list of bits
+  int2bits = len: e: reverseList (genList (x: bitAnd e (pow2 (x + 1)) > 0) len);
+  # Reverse operation for int2bits
+  bits2int = l: let
+    len = length l;
+    zf = a: b:
+      if a
+      then pow2 b
+      else 0;
+  in
+    foldl add 0 (zipListsWith zf l (genList (i: len - i) len));
 
-    # Convert integer to list of bits
-    int2bits = len: e: reverseList (genList (x: bitAnd e (pow2 (x + 1)) > 0) len);
-    # Reverse operation for int2bits
-    bits2int = l: let
-      len = length l;
-      zf = a: b:
-        if a
-        then pow2 b
-        else 0;
-    in
-      foldl add 0 (zipListsWith zf l (genList (i: len - i) len));
-
-    # IPv4 utilities
-    ipv4 = import ./ipv4.nix lib;
-  };
-in
-  nlib
+  # IPv4 utilities
+  ipv4 = import ./ipv4.nix final;
+}