refactor: optimize hmModule options

README.md

@@ -140,6 +140,7 @@ like `MAOMAOCONFIG=/home/xxx/maomao`
                             '';
                             autostart_sh = ''
                               # see autostart.sh
+                              # Note: here no need to add shebang
                             '';
                           };
                         }

nix/hm-modules.nix

@@ -4,41 +4,127 @@
   pkgs,
   ...
 }:
-
 let
   maomaowm = pkgs.callPackage ./. { };
+  cfg = config.wayland.windowManager.maomaowm;
+  variables = lib.concatStringsSep " " cfg.systemd.variables;
+  extraCommands = lib.concatStringsSep " && " cfg.systemd.extraCommands;
+  systemdActivation = ''${pkgs.dbus}/bin/dbus-update-activation-environment --systemd ${variables}; ${extraCommands}'';
+  autostart_sh = pkgs.writeShellScript "autostart.sh" ''
+    ${lib.optionalString cfg.systemd.enable systemdActivation}
+    ${cfg.autostart_sh}
+  '';
 in
 {
   options = {
-    wayland.windowManager.maomaowm = {
-      enable = lib.mkOption {
-        type = lib.types.bool;
+    wayland.windowManager.maomaowm = with lib; {
+      enable = mkOption {
+        type = types.bool;
         default = false;
       };
-
-      settings = lib.mkOption {
-        type = lib.types.str;
-        default = "";
+      systemd = {
+        enable = mkOption {
+          type = types.bool;
+          default = pkgs.stdenv.isLinux;
+          example = false;
+          description = ''
+            Whether to enable {file}`maomao-session.target` on
+            maomao startup. This links to
+            {file}`graphical-session.target`.
+            Some important environment variables will be imported to systemd
+            and dbus user environment before reaching the target, including
+            * {env}`DISPLAY`
+            * {env}`WAYLAND_DISPLAY`
+            * {env}`XDG_CURRENT_DESKTOP`
+            * {env}`XDG_SESSION_TYPE`
+            * {env}`NIXOS_OZONE_WL`
+            You can extend this list using the `systemd.variables` option.
+          '';
+        };
+        variables = mkOption {
+          type = types.listOf types.str;
+          default = [
+            "DISPLAY"
+            "WAYLAND_DISPLAY"
+            "XDG_CURRENT_DESKTOP"
+            "XDG_SESSION_TYPE"
+            "NIXOS_OZONE_WL"
+            "XCURSOR_THEME"
+            "XCURSOR_SIZE"
+          ];
+          example = [ "--all" ];
+          description = ''
+            Environment variables imported into the systemd and D-Bus user environment.
+          '';
+        };
+        extraCommands = mkOption {
+          type = types.listOf types.str;
+          default = [
+            "systemctl --user reset-failed"
+            "systemctl --user start maomao-session.target"
+          ];
+          description = ''
+            Extra commands to run after D-Bus activation.
+          '';
+        };
+        xdgAutostart = mkEnableOption ''
+          autostart of applications using
+          {manpage}`systemd-xdg-autostart-generator(8)`
+        '';
       };
-
-      autostart_sh = lib.mkOption {
-        type = lib.types.str;
+      settings = mkOption {
+        description = "maomaowm config content";
+        type = types.str;
         default = "";
+        example = ''
+          # menu and terminal
+          bind=Alt,space,spawn,rofi -show drun
+          bind=Alt,Return,spawn,foot
+        '';
+      };
+      autostart_sh = mkOption {
+        description = "WARRNING: This is a shell script, but no need to add shebang";
+        type = types.str;
+        default = "";
+        example = ''
+          waybar &
+        '';
       };
     };
   };
 
-  config = lib.mkIf config.wayland.windowManager.maomaowm.enable {
+  config = lib.mkIf cfg.enable {
     home.packages = [ maomaowm ];
-
-    home.file = {
-      ".config/maomao/config.conf" = {
-        text = config.wayland.windowManager.maomaowm.settings;
+    home.activation =
+      lib.optionalAttrs (cfg.autostart_sh != "") {
+        createMaomaoScript = lib.hm.dag.entryAfter [ "clearMaomaoConfig" ] ''
+          cat ${autostart_sh} > $HOME/.config/maomao/autostart.sh
+          chmod +x $HOME/.config/maomao/autostart.sh
+        '';
+      }
+      // lib.optionalAttrs (cfg.settings != "") {
+        createMaomaoConfig = lib.hm.dag.entryAfter [ "clearMaomaoConfig" ] ''
+          cat > $HOME/.config/maomao/config.conf <<EOF
+          ${cfg.settings}
+          EOF
+        '';
+      }
+      // {
+        clearMaomaoConfig = lib.hm.dag.entryAfter [ "writeBoundary" ] ''
+          rm -rf $HOME/.config/maomao
+          mkdir -p $HOME/.config/maomao
+        '';
       };
-
-      ".config/maomao/autostart.sh" = {
-        text = config.wayland.windowManager.maomaowm.autostart_sh;
-        executable = true;
+    systemd.user.targets.maomao-session = lib.mkIf cfg.systemd.enable {
+      Unit = {
+        Description = "maomao compositor session";
+        Documentation = [ "man:systemd.special(7)" ];
+        BindsTo = [ "graphical-session.target" ];
+        Wants = [
+          "graphical-session-pre.target"
+        ] ++ lib.optional cfg.systemd.xdgAutostart "xdg-desktop-autostart.target";
+        After = [ "graphical-session-pre.target" ];
+        Before = lib.optional cfg.systemd.xdgAutostart "xdg-desktop-autostart.target";
       };
     };
   };