From 7c30ce95627d63efeca85c4c65aaaee1856b7887 Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <eelco.dolstra@logicblox.com>
Date: Tue, 28 Jul 2015 14:56:27 +0200
Subject: [PATCH] Remove zipTwoLists

This function is redundant (we also have zipLists).
---
 lib/lists.nix           | 14 --------------
 nixos/lib/build-vms.nix | 18 +++++++++---------
 2 files changed, 9 insertions(+), 23 deletions(-)

diff --git a/lib/lists.nix b/lib/lists.nix
index fde6f5d42fcb..7fc1924066ba 100644
--- a/lib/lists.nix
+++ b/lib/lists.nix
@@ -209,20 +209,6 @@ rec {
   init = list: assert list != []; take (length list - 1) list;
 
 
-  # Zip two lists together.
-  zipTwoLists = xs: ys:
-    let
-      len1 = length xs;
-      len2 = length ys;
-      len = if len1 < len2 then len1 else len2;
-      zipTwoLists' = n:
-        if n != len then
-          [ { first = elemAt xs n; second = elemAt ys n; } ]
-          ++ zipTwoLists' (n + 1)
-        else [];
-    in zipTwoLists' 0;
-
-
   deepSeqList = xs: y: if any (x: deepSeq x false) xs then y else y;
 
   crossLists = f: foldl (fs: args: concatMap (f: map f args) fs) [f];
diff --git a/nixos/lib/build-vms.nix b/nixos/lib/build-vms.nix
index d0c9e7c6d236..01d6b21bba90 100644
--- a/nixos/lib/build-vms.nix
+++ b/nixos/lib/build-vms.nix
@@ -41,22 +41,22 @@ rec {
 
       machines = attrNames nodes;
 
-      machinesNumbered = zipTwoLists machines (range 1 254);
+      machinesNumbered = zipLists machines (range 1 254);
 
-      nodes_ = flip map machinesNumbered (m: nameValuePair m.first
+      nodes_ = flip map machinesNumbered (m: nameValuePair m.fst
         [ ( { config, pkgs, nodes, ... }:
             let
-              interfacesNumbered = zipTwoLists config.virtualisation.vlans (range 1 255);
-              interfaces = flip map interfacesNumbered ({ first, second }:
-                nameValuePair "eth${toString second}" { ip4 =
-                  [ { address = "192.168.${toString first}.${toString m.second}";
+              interfacesNumbered = zipLists config.virtualisation.vlans (range 1 255);
+              interfaces = flip map interfacesNumbered ({ fst, snd }:
+                nameValuePair "eth${toString snd}" { ip4 =
+                  [ { address = "192.168.${toString fst}.${toString m.snd}";
                       prefixLength = 24;
                   } ];
                 });
             in
             { key = "ip-address";
               config =
-                { networking.hostName = m.first;
+                { networking.hostName = m.fst;
 
                   networking.interfaces = listToAttrs interfaces;
 
@@ -76,11 +76,11 @@ rec {
 
                   virtualisation.qemu.options =
                     flip map interfacesNumbered
-                      ({ first, second }: qemuNICFlags second first m.second);
+                      ({ fst, snd }: qemuNICFlags snd fst m.snd);
                 };
             }
           )
-          (getAttr m.first nodes)
+          (getAttr m.fst nodes)
         ] );
 
     in listToAttrs nodes_;