Decreasing needed TABs for completion

[Gürkan <seqizz@gmail.com>]

Hi,

When using tab completion on app-parameter (e.g. not for "cd"), I'd
like to automatically "prefer" directories if possible.

It's kinda hard for me to explain, so please consider following tree:

a/
  something.py  # <-- a file
  something/     # <-- a directory
    something_else.py ...

When I do "vim a/so<tab>", buffer becomes "vim a/something".
On second <tab>, it shows "something.py" and "something/" as valid
options (without changing buffer).
On third <tab> it selects first one, but doesn't remove the suggestions.
That is the level (on 3rd <tab>) I'd like to land with first <tab> if possible.

Is there a way to achieve this?

Thanks,
-- 
Gürkan