From ec3006ab6fecded108e0c187c5b390012c42cb2b Mon Sep 17 00:00:00 2001
From: h7x4 <h7x4@nani.wtf>
Date: Sun, 27 Oct 2024 15:32:01 +0100
Subject: [PATCH] overrideAttrs: init

---
 flake.nix                |  1 +
 src/overrideExisting.nix | 25 +++++++++++++++++++++++++
 2 files changed, 26 insertions(+)
 create mode 100644 src/overrideExisting.nix

diff --git a/flake.nix b/flake.nix
index 123eed6..7f74a34 100644
--- a/flake.nix
+++ b/flake.nix
@@ -14,5 +14,6 @@
     getAttrs = import ./src/getAttrs.nix lib;
     subtractLists = import ./src/subtractLists.nix lib;
     unique = import ./src/unique.nix lib;
+    overrideExisting = import ./src/overrideExisting.nix lib;
   };
 }
diff --git a/src/overrideExisting.nix b/src/overrideExisting.nix
new file mode 100644
index 0000000..1e166ea
--- /dev/null
+++ b/src/overrideExisting.nix
@@ -0,0 +1,25 @@
+lib:
+let
+  overrideExistingOld =
+    old:
+    new:
+    builtins.mapAttrs (name: value: new.${name} or value) old;
+
+  overrideExistingNew =
+    old:
+    new:
+    old // (builtins.intersectAttrs old new);
+
+  bigdata = lib.genAttrs (lib.imap0 (i: _: toString i) (lib.replicate 999999 null)) (_: null);
+  attrsToOverride = {
+    "1" = "lmao";
+    "183" = "lmao";
+    "1823" = "lmao";
+    "1223" = "lmao";
+    "ads;fkjasdlfkja" = "no";
+  };
+in {
+  old = overrideExistingOld bigdata attrsToOverride;
+  new = overrideExistingNew bigdata attrsToOverride;
+  sanity = (overrideExistingOld bigdata attrsToOverride) == (overrideExistingNew bigdata attrsToOverride);
+}