Add dmenu_tmux

Signed-off-by: Oliver Davies <oliver@oliverdavies.uk>

modules/dmenu-tmux.nix

@@ -0,0 +1,28 @@
+{ inputs, ... }:
+
+{
+  flake.modules.homeManager.gui =
+    { pkgs, ... }:
+    {
+      home.packages = [
+        (pkgs.writeShellApplication {
+          name = "dmenu_tmux";
+
+          text = ''
+            selected="$(z tmux list | dmenu -l 20)"
+
+            if [[ -n "$selected" ]]; then
+              echo "$selected"
+
+              # TODO: open a terminal with the selected session.
+            fi
+          '';
+
+          runtimeInputs = with pkgs; [
+            dmenu
+            inputs.z.packages.${pkgs.stdenv.hostPlatform.system}.default
+          ];
+        })
+      ];
+    };
+}