modified nix files tailored for nixos, must make modular to merge into master

home/shell.nix

@@ -69,4 +69,19 @@
       fi
     '';
   };
+
+
+  programs.bash = {
+    enable = true;
+    initExtra = ''
+      if [[ -z "$BASH_EXECUTION_STRING" ]]; then
+        if [[ -n "$ZSH_VERSION" ]]; then
+          LOGIN_OPTION="--login"
+        else
+          LOGIN_OPTION=""
+        fi
+        exec ${pkgs.fish}/bin/fish $LOGIN_OPTION
+      fi
+    '';
+  };
 }