feat: replace waybar/walker/swaylock/swaybg with noctalia shell

flake.nix

@@ -17,9 +17,12 @@
       inputs.nixpkgs.follows = "nixpkgs";
     };
     claude-desktop.url = "github:k3d3/claude-desktop-linux-flake";
+    # Noctalia: Wayland shell for Niri (bar, launcher, lock, wallpaper, idle)
+    # Uses its own pinned nixpkgs (needs unstable deps)
+    noctalia.url = "github:noctalia-dev/noctalia-shell";
   };
 
-  outputs = { self, nixpkgs, home-manager, plasma-manager, zen-browser, claude-desktop, ... }: {
+  outputs = { self, nixpkgs, home-manager, plasma-manager, zen-browser, claude-desktop, noctalia, ... }@inputs: {
     nixosConfigurations.nixos = nixpkgs.lib.nixosSystem {
       system = "x86_64-linux";
       modules = [
@@ -34,6 +37,7 @@
           ];
           home-manager.useGlobalPkgs = true;
           home-manager.useUserPackages = true;
+          home-manager.extraSpecialArgs = { inherit inputs; };
           home-manager.sharedModules = [ plasma-manager.homeModules.plasma-manager ];
           home-manager.users.duynguyen = import ./home/duynguyen/default.nix;
         }

home/duynguyen/config/niri/config.kdl

@@ -80,12 +80,8 @@ layout {
     }
 }
 
-spawn-at-startup "waybar"
+spawn-at-startup "noctalia"
 spawn-at-startup "xwayland-satellite"
-spawn-at-startup "mako"
-spawn-at-startup "elephant"
-spawn-at-startup "sh" "-c" "walker --gapplication-service"
-spawn-at-startup "start-wallpaper"
 
 hotkey-overlay {
     skip-at-startup
@@ -133,8 +129,9 @@ binds {
     Mod+Shift+Slash { show-hotkey-overlay; }
 
     Mod+T     hotkey-overlay-title="Open a Terminal: kitty" { spawn "kitty"; }
-    Mod+Space hotkey-overlay-title="Run an Application: walker" { spawn "walker"; }
+    Mod+Space hotkey-overlay-title="Noctalia: Launcher"    { spawn "noctalia-ipc" "panel-toggle" "launcher"; }
-    Super+Alt+L hotkey-overlay-title="Lock the Screen: swaylock" { spawn "swaylock"; }
+    Mod+S     hotkey-overlay-title="Noctalia: Control Center" { spawn "noctalia-ipc" "panel-toggle" "control-center"; }
+    Super+Alt+L hotkey-overlay-title="Noctalia: Lock"     { spawn "noctalia-ipc" "session" "lock"; }
 
     XF86AudioRaiseVolume allow-when-locked=true { spawn-sh "wpctl set-volume @DEFAULT_AUDIO_SINK@ 0.1+ -l 1.0"; }
     XF86AudioLowerVolume allow-when-locked=true { spawn-sh "wpctl set-volume @DEFAULT_AUDIO_SINK@ 0.1-"; }

home/duynguyen/default.nix

@@ -1,17 +1,21 @@
-{ config, pkgs, lib, ... }:
+{ config, pkgs, lib, inputs, ... }:
 
 let
-  # Picks the first image from ~/.config/wallpapers and sets it via swaybg.
+  wallpaperDir = "${config.home.homeDirectory}/.config/wallpapers";
-  # Add images to home/duynguyen/wallpapers/ in the config repo and rebuild.
+  defaultWallpaper = "${wallpaperDir}/even-in-arcadia.png";
-  startWallpaper = pkgs.writeShellScriptBin "start-wallpaper" ''
+
-    f=$(find "$HOME/.config/wallpapers" -maxdepth 1 -type f \
+  # Thin wrapper so niri keybinds can call  noctalia msg <args>
-      \( -name "*.jpg" -o -name "*.jpeg" -o -name "*.png" \
+  # without hard-coding the nix-store path.
-         -o -name "*.gif"  -o -name "*.webp" -o -name "*.avif" \) \
+  noctaliaIpc = pkgs.writeShellScriptBin "noctalia-ipc" ''
-      | sort | head -1)
+    set -eu
-    [ -n "$f" ] && exec ${pkgs.swaybg}/bin/swaybg -i "$f" -m fill
+    exec noctalia msg "$@"
   '';
 in
 {
+  imports = [
+    inputs.noctalia.homeModules.default
+  ];
+
   home.username = "duynguyen";
   home.homeDirectory = "/home/duynguyen";
   home.stateVersion = "26.05";
@@ -21,6 +25,8 @@ in
   fonts.fontconfig.enable = false;
 
   home.packages = with pkgs; [
+    noctaliaIpc
+
     # Browsers
     zen-browser
     claude-desktop
@@ -28,23 +34,16 @@ in
     # Terminals
     ghostty
     kitty
-    foot          # lightweight, good default for Niri
+    foot
 
     # Niri supporting tools
-    startWallpaper    # picks wallpaper from ~/.config/wallpapers and runs swaybg
-    walker            # app launcher
-    elephant          # modular data provider for walker
-    fuzzel            # app launcher (alternative)
-    waybar
-    mako              # notifications
-    wl-clipboard      # copy/paste in Wayland terminal
-    swaylock          # screen locker
-    swayidle          # idle management
-    swaybg            # wallpaper setter
     xwayland-satellite # X11 app support in Niri
     xdg-utils          # xdg-open, file associations
     inotify-tools      # filesystem event tools
 
+    # Polkit agent for Niri session (graphical auth dialogs)
+    kdePackages.polkit-kde-agent-1
+
     # Editor
     vscodium
 
@@ -53,22 +52,23 @@ in
     imv
     gimp
     obs-studio
-    zathura       # PDF viewer
+    zathura
-    thunar                          # file manager
+    thunar
-    xfce.thunar-archive-plugin     # right-click archive operations
+    xfce.thunar-archive-plugin
-    xfce.tumbler                   # thumbnail service
+    xfce.tumbler
-    ffmpegthumbnailer              # video thumbnails
+    ffmpegthumbnailer
-    xarchiver                      # archive manager GUI
+    xarchiver
-    grim          # Wayland screenshot
+    grim
-    slurp         # region selector for grim
+    slurp
-    swappy        # screenshot annotation
+    swappy
     libreoffice
     telegram-desktop
-    pavucontrol   # audio GUI
+    pavucontrol
-    blueman       # Bluetooth GUI
+    blueman
 
     # Clipboard
-    cliphist      # clipboard history (pairs with wl-clipboard)
+    cliphist
+    wl-clipboard
 
     # CLI tools
     vim
@@ -77,23 +77,23 @@ in
     fastfetch
     btop
     ripgrep
-    fd            # fast find alternative
+    fd
     fzf
-    eza           # modern ls
+    eza
-    bat           # modern cat
+    bat
-    dust          # intuitive disk usage
+    dust
-    jq            # JSON processing
+    jq
-    yq            # YAML processing
+    yq
-    shellcheck    # shell script linter
+    shellcheck
     ffmpeg
     imagemagick
     unzip
     p7zip
-    wiremix       # TUI PipeWire audio mixer
+    wiremix
 
     # System control
-    brightnessctl # brightness keys
+    brightnessctl
-    playerctl     # media keys
+    playerctl
 
     # Dev tools
     gh
@@ -104,24 +104,93 @@ in
   home.sessionVariables.NIXOS_OZONE_WL = "1";
 
   # Wallpapers folder — add images to home/duynguyen/wallpapers/ in the repo
-  # and rebuild; swaybg will pick the first one alphabetically
+  # and rebuild; noctalia reads from ~/.config/wallpapers
   xdg.configFile."wallpapers".source = ./wallpapers;
 
+  # Polkit agent as a systemd user service so it starts with the Niri session
+  systemd.user.services.polkit-kde-agent = {
+    Unit = {
+      Description = "KDE Polkit Authentication Agent";
+      PartOf = [ "graphical-session.target" ];
+      After = [ "graphical-session.target" ];
+    };
+    Service = {
+      ExecStart = "${pkgs.kdePackages.polkit-kde-agent-1}/libexec/polkit-kde-authentication-agent-1";
+      Restart = "on-failure";
+      RestartSec = 1;
+    };
+    Install.WantedBy = [ "graphical-session.target" ];
+  };
+
+  # ── Noctalia ──────────────────────────────────────────────────────────────
+  # Replaces: waybar, walker, swaylock, swaybg, swayidle, mako
+  programs.noctalia = {
+    enable = true;
+    settings = {
+      bar.default = {
+        start   = [ "launcher" "clipboard" "cpu" "network" "ram" ];
+        center  = [ "clock" ];
+        end     = [ "notifications" "volume" "brightness" "battery" "control-center" "session" ];
+        thickness      = 40;
+        padding        = 10;
+        radius         = 0;
+        margin_edge    = 0;
+        margin_ends    = 0;
+        widget_spacing = 8;
+      };
+
+      idle = {
+        behavior_order = [ "lock" "screen-off" ];
+        behavior = {
+          lock = {
+            action  = "lock";
+            enabled = true;
+            timeout = 600;   # 10 min
+          };
+          screen-off = {
+            action  = "screen_off";
+            enabled = true;
+            timeout = 660;
+          };
+        };
+      };
+
+      lockscreen.wallpaper = defaultWallpaper;
+
+      nightlight.enabled = true;
+
+      osd.position = "top_right";
+
+      shell = {
+        font_family           = "JetBrainsMono Nerd Font";
+        polkit_agent          = true;
+        corner_radius_scale   = 0.0;
+        animation.speed       = 1.5;
+        panel = {
+          clipboard_placement     = "attached";
+          launcher_placement      = "attached";
+          launcher_session_search = true;
+        };
+        shadow.alpha = 0.5;
+      };
+
+      theme.builtin = "Kanagawa";
+
+      wallpaper = {
+        enabled  = true;
+        directory = wallpaperDir;
+        default.path = defaultWallpaper;
+      };
+    };
+  };
+
+  # ── Shell ─────────────────────────────────────────────────────────────────
   programs.zsh = {
     enable = true;
     autosuggestion.enable = true;
     syntaxHighlighting.enable = true;
   };
 
-  programs.waybar = {
-    enable = true;
-    style = builtins.readFile ./config/waybar/style.css;
-  };
-
-  # Write config directly to avoid home-manager's waybar settings type
-  # conflicting with the `modules` key used by the group/drawer widget
-  xdg.configFile."waybar/config".source = ./config/waybar/config.json;
-
   programs.kitty = {
     enable = true;
     settings.wheel_scroll_multiplier = 10;
@@ -142,6 +211,7 @@ in
     };
   };
 
+  # ── KDE Plasma (for the Plasma session; dark theme + touchpad) ────────────
   programs.plasma = {
     enable = true;
     workspace.lookAndFeel = "org.kde.breezedark.desktop";
@@ -157,8 +227,7 @@ in
     ];
   };
 
-  # Zen Browser scroll speed — written to all profiles via activation script
+  # ── Zen Browser scroll speed ──────────────────────────────────────────────
-  # so it works even if the profile ID changes on a fresh install
   home.activation.zenBrowserUserJs = lib.hm.dag.entryAfter [ "writeBoundary" ] ''
     for profile in "$HOME/.config/zen/"*.*/; do
       [[ -d "$profile" ]] || continue
@@ -166,6 +235,7 @@ in
     done
   '';
 
+  # ── Niri config ───────────────────────────────────────────────────────────
   xdg.configFile."niri/config.kdl".source =
     pkgs.runCommand "niri-config-checked"
       { nativeBuildInputs = [ pkgs.niri ]; }