Added basic systemd for sway

modules/sway.nix

@@ -15,6 +15,51 @@
       swaylock
       wl-clipboard
       wofi
+      (writeTextFile {
+        name = "sway-entry";
+        destination = "/bin/sway-entry";
+        executable = true;
+        text = ''
+          #! ${pkgs.bash}/bin/bash
+
+          # first import environment variables from the login manager
+          # function is currently deprecated. It should be rolled back in the future
+          systemctl --user import-environment
+
+          # then start the service
+          exec systemctl --user start sway.service
+        '';
+      })
     ];
   };
+
+  systemd.user.targets.sway-session = {
+    description = "Sway compositor session";
+    documentation = [ "man:systemd.special(7)" ];
+    bindsTo = [ "graphical-session.target" ];
+    wants = [ "graphical-session-pre.target" ];
+    after = [ "graphical-session-pre.target" ];
+  };
+
+  systemd.user.services.sway = {
+    description = "Sway - Wayland window manager";
+    documentation = [ "man:sway(5)" ];
+    bindsTo = [ "graphical-session.target" ];
+    wants = [ "graphical-session-pre.target" ];
+    after = [ "graphical-session-pre.target" ];
+    # We explicitly unset PATH here, as we want it to be set by
+    # systemctl --user import-environment in startsway
+    environment.PATH = lib.mkForce null;
+    serviceConfig = {
+      Type = "simple";
+      ExecStart = ''
+        ${pkgs.dbus}/bin/dbus-run-session ${pkgs.sway}/bin/sway --debug
+      '';
+      Restart = "on-failure";
+      RestartSec = 1;
+      TimeoutStopSec = 10;
+    };
+  };
+
+  users.users.james.extraGroups = [ "video" "audio" ];
 }