added some utilities and going to nh

home/shell.nix

@@ -1,5 +1,13 @@
 { ... }:
 {
+  programs.fish = {
+    enable = true;
+    # nixpkgs' devenv only ships fish completions, not the auto-loaded hook.
+    interactiveShellInit = ''
+      devenv hook fish | source
+    '';
+  };
+
   programs.bash = {
     enable = true;
     bashrcExtra = "eval \"$(devenv hook bash)\"\n";