l: add tmux config

lass/2configs/baseX.nix

@@ -11,6 +11,7 @@ in {
     ./xdg-open.nix
     ./yubikey.nix
     ./pipewire.nix
+    ./tmux.nix
     ./xmonad.nix
     {
       krebs.per-user.lass.packages = [

lass/2configs/tmux.nix

@@ -0,0 +1,46 @@
+with import <stockholm/lib>;
+{ config, pkgs, ... }:
+
+{
+  nixpkgs.config.packageOverrides = super: {
+    tmux = pkgs.symlinkJoin {
+      name = "tmux";
+      paths = [
+        (pkgs.writeDashBin "tmux" ''
+          exec ${super.tmux}/bin/tmux -f ${pkgs.writeText "tmux.conf" ''
+            #change prefix key to `
+            set-option -g prefix `
+            unbind-key C-b
+            bind ` send-prefix
+
+            set-option -g default-terminal screen-256color
+
+            #use session instead of windows
+            bind-key c new-session
+            bind-key p switch-client -p
+            bind-key n switch-client -n
+            bind-key C-s switch-client -l
+          ''} "$@"
+        '')
+        super.tmux
+      ];
+    };
+  };
+  environment.systemPackages = with pkgs; [
+    tmux
+  ];
+
+  # programs.bash.interactiveShellInit = ''
+  #   if [[ "$TERM" != "linux" && -z "$TMUX" ]]; then
+  #     if [[ -n "$SSH_AUTH_SOCK" ]]; then
+  #       tmux set-environment -g SSH_AUTH_SOCK "$SSH_AUTH_SOCK" 2>/dev/null
+  #     fi
+
+  #     exec tmux -u
+  #   fi
+  #   if [[ "$__host__" != "$HOST" ]]; then
+  #     tmux set -g status-bg colour$(string_hash $HOST 255)
+  #     export __host__=$HOST
+  #   fi
+  # '';
+}