nix/hm: add option to disable systemd service (#526)

* nix/hm: add option to disable systemd service

* readme: complement home manager configuring

README.md

@@ -63,6 +63,8 @@ or a devshell. The shell can then be run via `caelestia-shell`.
 > The default package does not have the CLI enabled by default, which is required for full funcionality.
 > To enable the CLI, use the `with-cli` package.
 
+For home-manager, you can also use the Caelestia's home manager module (explained in [configuring](https://github.com/caelestia-dots/shell?tab=readme-ov-file#configuring)) that installs and configures the shell and the CLI.
+
 ### Manual installation
 
 Dependencies:
@@ -207,15 +209,24 @@ For NixOS users, a home manager module is also available.
 ```nix
 programs.caelestia = {
   enable = true;
+  systemd.enable = false; # if you prefer starting from your compositor
   settings = {
     bar.status = {
       showBattery = false;
     };
     paths.wallpaperDir = "~/Images";
   };
+  cli = {
+    enable = true; # Also add caelestia-cli to path
+    settings = {
+      theme.enableGtk = false;
+    };
+  };
 };
 ```
 
+The module automatically adds Caelestia shell to the path with **full functionality**. The CLI is not required, however you have the option to enable and configure it.
+
 </details>
 
 > [!NOTE]
@@ -478,7 +489,7 @@ which helped me a lot with learning how to use Quickshell.
 
 Finally another thank you to all the configs I took inspiration from (only one for now):
 
--   [Axenide/Ax-Shell](https://github.com/Axenide/Ax-Shell)
+- [Axenide/Ax-Shell](https://github.com/Axenide/Ax-Shell)
 
 ## Stonks 📈
 

nix/hm-module.nix

@@ -19,6 +19,13 @@ in {
         default = shell-default;
         description = "The package of Caelestia shell";
       };
+      systemd = {
+        enable = mkOption {
+          type = types.bool;
+          default = true;
+          description = "Enable the systemd service for Caelestia shell";
+        };
+      };
       settings = mkOption {
         type = types.attrsOf types.anything;
         default = {};
@@ -55,12 +62,12 @@ in {
     shell = cfg.package or shell-default;
   in
     lib.mkIf cfg.enable {
-      systemd.user.services.caelestia = {
+      systemd.user.services.caelestia = lib.mkIf cfg.systemd.enable {
         Unit = {
           Description = "Caelestia Shell Service";
           After = ["graphical-session.target"];
           PartOf = ["graphical-session.target"];
-          X-Restart-Triggers = lib.mkIf (cfg.settings != { }) [
+          X-Restart-Triggers = lib.mkIf (cfg.settings != {}) [
             "${config.xdg.configFile."caelestia/shell.json".source}"
           ];
         };