feat: initial macos setup

home/alex/default.nix

@@ -1,24 +1,34 @@
-{ pkgs, ... }: {
+{ pkgs, lib, isDarwin, ... }:
+
+let
+  # Modules that only make sense on Linux, either because they use systemd,
+  # KDE/Plasma, or a package that nixpkgs only builds for Linux. On macOS the
+  # equivalents are installed as Homebrew casks (see modules/darwin.nix).
+  linuxOnly = lib.optionals (!isDarwin) [
+    ../modules/plasma.nix
+    ../modules/dropbox.nix
+    ../modules/globalprotect.nix
+    ../modules/gimp.nix
+    ../modules/libreoffice.nix
+    ../modules/masterpdfeditor.nix
+    ../modules/pymol.nix
+    ../modules/zoom.nix
+  ];
+in
+{
   home.username = "alex";
-  home.homeDirectory = "/home/alex";
+  home.homeDirectory = if isDarwin then "/Users/alex" else "/home/alex";
   home.stateVersion = "25.11";
   home.sessionPath = [ "$HOME/.local/bin" ];
 
   imports = [
     ../modules/datalad.nix
     ../modules/docker.nix
-    ../modules/dropbox.nix
     ../modules/fonts.nix
     ../modules/ghostty.nix
-    ../modules/gimp.nix
-    ../modules/globalprotect.nix
     ../modules/helix.nix
     ../modules/hyperfine.nix
-    ../modules/libreoffice.nix
-    ../modules/masterpdfeditor.nix
     ../modules/pixi.nix
-    ../modules/plasma.nix
-    ../modules/pymol.nix
     ../modules/python.nix
     ../modules/rust.nix
     ../modules/ssh.nix
@@ -28,21 +38,21 @@
     ../modules/yazi.nix
     ../modules/zellij.nix
     ../modules/zig.nix
-    ../modules/zoom.nix
     ../modules/zsh.nix
     ./git.nix
     ./gh.nix
-  ];
+  ] ++ linuxOnly;
 
   home.packages = with pkgs; [
     atool
     httpie
     just
-    spotify
-    brave
     git-lfs
     typst
     unzip
     glow
+  ] ++ lib.optionals (!isDarwin) [
+    spotify
+    brave
   ];
 }