home: fix Neovim autosave

hosts/home.nix

@@ -96,7 +96,6 @@ in
       gC = "g clone";
       goops = "g reset --soft HEAD^";
 
-      v = "nvim";
       r = "ranger";
       rm = "trash-put";
       emacs = "emacsclient -nw";
@@ -105,6 +104,14 @@ in
       clear = "printf '\\E[H\\E[3J'";
     };
     bashrcExtra = ''
+      function v {
+        if [[ $# -eq 0 ]]; then
+          nvim ~/UNTITLED.md
+        else
+          nvim $1
+        fi
+      }
+
       # Modify killall for wrapped applications, e.g. firefox
       # killall firefox -> killall firefox || killall .firefox-wrapped
       function killall {