dustbowl: improve sway-systemd-wlsunset integration

nixos/dustbowl.nix

@@ -119,10 +119,10 @@
     defaultLocale = "en_US.UTF-8";
   };
 
-  # Set location (e.g. for redshift)
+  # Set location (for wlsunset)
   location = {
-    latitude = 1.3766;
-    longitude = 103.8160;
+    latitude = 49.5;
+    longitude = 8.4;
   };
 
   environment.systemPackages = with pkgs; [
@@ -247,8 +247,8 @@
     serviceConfig = {
       ExecStart = ''
         ${pkgs.wlsunset}/bin/wlsunset \
-          -l 49.5 \
-          -L 8.4 \
+          -l ${toString config.location.latitude} \
+          -L ${toString config.location.longitude} \
           -t 2000 \
       '';
       RestartSec = 3;
@@ -256,14 +256,13 @@
     };
   };
 
-  # Hardware
-
   # Enable sound.
   sound.enable = true;
 
   # Bluetooth
   hardware.bluetooth.enable = true;
 
+  # Enable experimental features in bluetoothd with -E flag
   systemd.services.bluetooth.serviceConfig.ExecStart =
     let args = [ "-f" "/etc/bluetooth/main.conf" "-E" ];
     in lib.mkForce [ "" "${config.hardware.bluetooth.package}/libexec/bluetooth/bluetoothd ${lib.escapeShellArgs args}" ];
@@ -288,7 +287,25 @@
   };
 
   # Sway
-  programs.sway.enable = true;
+  programs.sway = {
+    extraSessionCommands = ''
+      export XCURSOR_THEME=Adwaita
+    '';
+    wrapperFeatures.gtk = true;
+    enable = true;
+  };
+
+  # Sway systemd integration
+  # https://wiki.archlinux.org/title/Sway#Manage_Sway-specific_daemons_with_systemd
+  systemd.user.targets.sway-session = {
+    description = "Sway compositor session";
+    bindsTo = [ "graphical-session.target" ];
+    wants = [ "graphical-session-pre.target" ];
+    after = [ "graphical-session-pre.target" ];
+  };
+  environment.etc."sway/config.d/systemd.conf".source = pkgs.writeText "systemd.conf" ''
+    exec_always "systemctl --user start sway-session.target"
+  '';
 
   xdg.portal = {
     enable = true;