refactor: start i3/hyprland in home-manager instead of NixOS

home/linux/hyprland/default.nix

@@ -11,17 +11,25 @@
   ];
 
   # NOTE:
-  #   (Required) NixOS Module: enables critical components needed to run Hyprland properly
-  #   (Optional) Home-manager module: lets you declaratively configure Hyprland
+  # We have to enable hyprland/i3's systemd user service in home-manager,
+  # so that gammastep/wallpaper-switcher's user service can be start correctly!
+  # they are all depending on hyprland/i3's user graphical-session
   wayland.windowManager.hyprland = {
     enable = true;
     package = hyprland.packages.${pkgs.system}.hyprland;
     settings = lib.mkForce {};
     extraConfig = builtins.readFile ./hypr-conf/hyprland.conf;
-    # programs.grammastep need this to be enabled.
+    # gammastep/wallpaper-switcher need this to be enabled.
     systemd.enable = true;
   };
 
+  # NOTE: this executable is used by greetd to start a wayland session when system boot up
+  # with such a vendor-no-locking script, we can switch to another wayland compositor without modifying greetd's config in NixOS module
+  home.file.".wayland-session" = {
+    source = "${pkgs.hyprland}/bin/Hyprland";
+    executable = true;
+  };
+
   # hyprland configs, based on https://github.com/notwidow/hyprland
   xdg.configFile = {
     "hypr/mako" = {

home/linux/hyprland/hypr-conf/scripts/startup

@@ -10,8 +10,9 @@ for _prs in "${_ps[@]}"; do
 	fi
 done
 
-# Set wallpaper
-swaybg --output '*' --mode fill --image ~/.config/wallpapers/default_wallpaper &
+# Set wallpaper via a wallpaper.service
+# it will by start by home-manager automatically, do not need to restart it here.
+# systemctl --user restart wallpaper.service
 
 # Lauch notification daemon (mako)
 ~/.config/hypr/scripts/notifications &

home/linux/hyprland/packages.nix

@@ -0,0 +1,27 @@
+{pkgs, ...}: {
+  home.packages = with pkgs; [
+    waybar # the status bar
+    swaybg # the wallpaper
+    swayidle # the idle timeout
+    swaylock # locking the screen
+    wlogout # logout menu
+    wl-clipboard # copying and pasting
+    hyprpicker # color picker
+
+    wf-recorder # creen recording
+    grim # taking screenshots
+    slurp # selecting a region to screenshot
+    # TODO replace by `flameshot gui --raw | wl-copy`
+
+    mako # the notification daemon, the same as dunst
+
+    yad # a fork of zenity, for creating dialogs
+
+    # audio
+    alsa-utils # provides amixer/alsamixer/...
+    mpd # for playing system sounds
+    mpc-cli # command-line mpd client
+    ncmpcpp # a mpd client with a UI
+    networkmanagerapplet # provide GUI app: nm-connection-editor
+  ];
+}