From c82b2327e56f6ca41b8935c22c46853ac5926659 Mon Sep 17 00:00:00 2001
From: Pat McLaughlin <me@patmclaughl.in>
Date: Thu, 31 Mar 2022 11:03:41 -0400
Subject: [PATCH] add mouse scaling system setting

---
 modules/system/defaults/GlobalPreferences.nix | 21 ++++++++++++++++++-
 1 file changed, 20 insertions(+), 1 deletion(-)

diff --git a/modules/system/defaults/GlobalPreferences.nix b/modules/system/defaults/GlobalPreferences.nix
index 935a8f2a..5cce4196 100644
--- a/modules/system/defaults/GlobalPreferences.nix
+++ b/modules/system/defaults/GlobalPreferences.nix
@@ -2,7 +2,17 @@
 
 with lib;
 
-{
+let
+  isFloat = x: isString x && builtins.match "^[+-]?([0-9]*[.])?[0-9]+$" x != null;
+
+  float = mkOptionType {
+    name = "float";
+    description = "float";
+    check = isFloat;
+    merge = options.mergeOneOption;
+  };
+
+in {
   options = {
 
     system.defaults.".GlobalPreferences"."com.apple.sound.beep.sound" =
@@ -16,5 +26,14 @@ with lib;
         '';
       };
 
+    system.defaults.".GlobalPreferences"."com.apple.mouse.scaling" =
+      mkOption {
+        type = types.nullOr float;
+        default = null;
+        description = ''
+          Sets the mouse tracking speed. Found in the "Mouse" section of
+          "System Preferences". Set to -1 to disable mouse acceleration.
+        '';
+      };
   };
 }