> echo $EDITOR
hx
> xdg-mime query default inode/directory 
lf.desktop
> xdg-open ~/mydirectory
(lf opens)
> open ~/mydirectory
(lf opens)
> open ~/myfile.txt
(hx opens)
> xdg-open ~/myfile.txt
(hx opens)

> xdg-open ~/mydirectory
(lf opens)
> open ~/mydirectory
(nothing happens and I'm still at a fish prompt)
> open ~/myfile.txt
(nothing happens and I'm still at a fish prompt)
> xdg-open ~/myfile.txt
(hx opens)

> function opentest
       for i in $argv
             xdg-open $i
         end
     end
> opentest somedir/
(lf is opened correctly)