Adds tmux.

modules/nixos/core/default.nix

@@ -47,6 +47,22 @@
       '';
     };
   };
+  programs.tmux = {
+    enable = true;
+    escapeTime = 0;
+    clock24 = true;
+    extraConfig = ''
+      bind - split-window -h -c "#{pane_current_path}"
+      bind | split-window -v -c "#{pane_current_path}"
+      unbind '"'
+      unbind %
+
+      bind -n M-Left select-pane -L
+      bind -n M-Right select-pane -R
+      bind -n M-Up select-pane -U
+      bind -n M-Down select-pane -D
+    '';
+  };
   environment.systemPackages = with pkgs; [
     nvd nixpkgs-fmt nix-output-monitor
     coreutils mime-types file