feat(hyprland): add directional focus binds

configs/nixos/modules/desktop/session/hyprland/default.nix

@@ -9,7 +9,7 @@
 
   config = lib.mkIf config.modules.desktop.session.hyprland.enable {
     registry.keybind.${config.networking.hostName} = lib.listToAttrs (
-      map (workspace: {
+      (map (workspace: {
         name = "hyprland-workspace-${toString workspace}";
         value = {
           keys = "SUPER + ${toString workspace}";
@@ -18,7 +18,40 @@
             inherit workspace;
           };
         };
-      }) (lib.range 1 9)
+      }) (lib.range 1 9))
+      ++
+        map
+          (
+            { direction, key }:
+            {
+              name = "hyprland-focus-${direction}";
+              value = {
+                keys = "SUPER + ${key}";
+                action = {
+                  kind = "focus-direction";
+                  inherit direction;
+                };
+              };
+            }
+          )
+          [
+            {
+              key = "H";
+              direction = "left";
+            }
+            {
+              key = "J";
+              direction = "down";
+            }
+            {
+              key = "K";
+              direction = "up";
+            }
+            {
+              key = "L";
+              direction = "right";
+            }
+          ]
     );
 
     # This program integration owns the session, portals, and polkit, launched
@@ -53,6 +86,9 @@
             (lib.generators.mkLuaInline (
               {
                 exec = "hl.dsp.exec_cmd(${lib.generators.toLua { } keybind.action.command})";
+                "focus-direction" = "hl.dsp.focus(${
+                  lib.generators.toLua { } { inherit (keybind.action) direction; }
+                })";
                 "focus-workspace" = "hl.dsp.focus(${
                   lib.generators.toLua { } { inherit (keybind.action) workspace; }
                 })";

configs/nixos/registry/keybind.nix

@@ -11,6 +11,7 @@
         lib.all (
           entry:
           (entry.value.action.kind == "exec" && entry.value.action.command != null)
+          || (entry.value.action.kind == "focus-direction" && entry.value.action.direction != null)
           || (entry.value.action.kind == "focus-workspace" && entry.value.action.workspace != null)
         ) entries;
       message = "Desktop keybind actions must set the fields their kind requires.";
@@ -33,6 +34,7 @@
               description = "Selects the keybind action kind.";
               type = lib.types.enum [
                 "exec"
+                "focus-direction"
                 "focus-workspace"
               ];
             };
@@ -44,6 +46,20 @@
               example = "ghostty";
             };
 
+            direction = lib.mkOption {
+              description = "Direction focused by a focus-direction keybind.";
+              type = lib.types.nullOr (
+                lib.types.enum [
+                  "down"
+                  "left"
+                  "right"
+                  "up"
+                ]
+              );
+              default = null;
+              example = "left";
+            };
+
             workspace = lib.mkOption {
               description = "Workspace focused by a focus-workspace keybind.";
               type = lib.types.nullOr lib.types.int;