feat: Niri additions

- Switch to unstable branch.
- Run xwayland-sattelite as a serivce.
- Initialise terminal windows at smaller widths.
- Style & bind tabs.
- Block out private windows.
- Binds for dynamic casting.

modules/home/users/crumb/niri.nix

@@ -24,6 +24,14 @@ in {
 
     services.polkit-gnome.enable = true;
 
+    systemd.user.services.xwayland-satellite =
+      lib.mkIf cfg.xwayland-satellite.enable {
+        Service.ExecStart =
+          ["${pkgs.xwayland-satellite}/bin/xwayland-satellite"];
+        Unit.After = ["niri.service"];
+        Unit.PartOf = ["niri.service"];
+      };
+
     programs.niri = {
       # Activates some Nixpkgs patches to help run Electron applications under
       # Wayland.
@@ -33,9 +41,6 @@ in {
 
         spawn-at-startup =
           [{ command = [ "${pkgs.swaynotificationcenter}/bin/swaync" ]; }]
-          ++ lib.optional
-            cfg.xwayland-satellite.enable
-            { command = [ "${pkgs.xwayland-satellite}/bin/xwayland-satellite" ]; }
           ++ lib.optional
             (! builtins.isNull cfg.wallpaper)
             { command = [ "${pkgs.wbg}/bin/wbg" "${cfg.wallpaper}" ]; };
@@ -85,6 +90,15 @@ in {
             offset.x = 5;
             offset.y = 5;
           };
+          tab-indicator = {
+            place-within-column = true;
+            position = "top";
+            # active.color = config.lib.stylix.colors.withHashtag.blue;
+            inactive.color = config.lib.stylix.colors.withHashtag.base01;
+            width = 8;
+            corner-radius = 2.0;
+            gaps-between-tabs = 10;
+          };
         };
         prefer-no-csd = true;
         screenshot-path = "~/Pictures/Screenshots/%Y-%m-%d %H-%M-%S.png";
@@ -93,9 +107,41 @@ in {
           size = 24;
         };
         window-rules = [
-          {
+          { # Set red borders to indicate that a window is being captured.
             matches = [
-              { title = "Element.*wishdir"; }
+              { is-window-cast-target = true; }
+            ];
+            focus-ring = {
+              enable = true;
+              width = 2;
+              active.color = "#f38ba8";
+              inactive.color = "#7d0d2d";
+            };
+            border = {
+              width = 2;
+              inactive.color = "#7d0d2d";
+              active.color = "#7d0d2d";
+            };
+            shadow = {
+              color = "#7d0d2d70";
+              softness = 30;
+              spread = 10;
+              offset.x = 0;
+              offset.y = 0;
+            };
+            tab-indicator = {
+              active.color = "#f38ba8";
+              inactive.color = "#7d0d2d";
+            };
+          }
+          { # Block private DMs from screencast...
+            matches = [
+              { title = "Element \\|"; }
+              { title = "^Discord \\| @"; }
+            ];
+            excludes = [
+              # ... except when explicitly targeting the window.
+              { is-window-cast-target = true; }
             ];
             block-out-from = "screen-capture";
           }
@@ -116,6 +162,13 @@ in {
             ];
             open-floating = true;
           }
+          { # Start terminals with low width.
+            matches = [
+              { app-id = "com\\.mitchellh\\.ghostty"; }
+              { title = "^\\*eshell\\*"; }
+            ];
+            default-column-width.proportion = 1.0 / 3.0;
+          }
           {
             # Enable rounded corners for all windows.
             geometry-corner-radius =
@@ -136,10 +189,14 @@ in {
           "Mod+D".action.spawn = ["${pkgs.fuzzel}/bin/fuzzel"];
           "Mod+Shift+Slash".action.show-hotkey-overlay = [];
 
-          # Powers off the monitors. To turn them back on, do any input like
-          # moving the mouse or pressing any other key.
+          # Powers off the monitors.  They will be powered back on upon any
+          # keyboard/mouse input.
           "Mod+Shift+P".action.power-off-monitors = []; 
 
+          "Mod+I".action.set-dynamic-cast-window = [];
+          "Mod+Shift+I".action.set-dynamic-cast-monitor = [];
+          "Mod+Ctrl+I".action.clear-dynamic-cast-target = [];
+
           "Mod+BracketLeft".action.consume-or-expel-window-left = [];
           "Mod+BracketRight".action.consume-or-expel-window-right = [];
           "Mod+Comma".action.consume-window-into-column = [];
@@ -154,8 +211,7 @@ in {
           "Mod+C".action.center-column = [];
           "Mod+M".action.maximize-column = [];
           "Mod+Shift+M".action.fullscreen-window = [];
-          # Currently unreleased }:(.
-          # "Mod+Ctrl+M".action.toggle-windowed-fullscreen = [];
+          "Mod+Ctrl+M".action.toggle-windowed-fullscreen = [];
 
           "Mod+Shift+S".action.screenshot = [];
           "Print".action.screenshot-screen = [];