add some initial stuff

modules/cli/fish.nix

@@ -0,0 +1,33 @@
+{
+  pkgs,
+  config,
+  lib,
+  ...
+}:
+let
+  cfg = config.xyno.cli.fish;
+in
+{
+  options.xyno.cli.fish.enable = lib.mkEnableOption "enable the fish shell with xynos config";
+  config = lib.mkIf cfg.enable {
+    programs.bash = {
+      # auto spawn fish if interactive
+      interactiveShellInit = ''
+        if [[ $(${pkgs.procps}/bin/ps --no-header --pid=$PPID --format=comm) != "fish" && -z ''${BASH_EXECUTION_STRING} ]]
+        then
+          shopt -q login_shell && LOGIN_OPTION='--login' || LOGIN_OPTION=""
+          exec ${pkgs.fish}/bin/fish $LOGIN_OPTION
+        fi
+      '';
+    };
+    environment.systemPackages = with pkgs; [
+      fishPlugins.grc
+      grc
+    ];
+    programs.direnv.enableFishIntegration = true;
+    programs.fish.interactiveShellInit = ''
+      set -g fish_key_bindings fish_vi_key_bindings
+    '';
+    programs.fish.enable = true;
+  };
+}