bug#12492: Acknowledgement (24.2.50; Open vc-dir buffer easier and faster)

[Juri Linkov]

>> Given all the discussed constraints (no change in default behavior of
>> `C-x v d' is allowed, etc.), I see one way to close this bug report -
>> to add a customizable variable:
>
> Why not a new command, like I suggested before? Either way the user would
> have to customize something (a keybinding, in that case).

You can implement a new command in addition to defcustom.
These options are not mutually exclusive.
And the command even could use the new defcustom
in the implementation, e.g.

(defun vc-root-dir ()
  (interactive)
  (let ((vc-dir-default-directory t))
    (call-interactively 'vc-dir) ...

But the command has more unsolved issues:

1. command name - the most natural name would be vc-root-dir,
   but this name is already taken by a non-interactive function.

2. keybinding - there are many contradicting proposals,
   and leaving it unbound is not the best solution.

>> +(defcustom vc-dir-default-directory nil
>> +  "Default directory name for the command `vc-dir'.
>
> Both of these lines look wrong.
>
> VC-Dir already uses the correct directory as the default. What you're
> looking for is to avoid prompting the user.

These details are explained further down in the docstring:

+When nil, `vc-dir' reads a directory name using the minibuffer.
+When non-nil and the current directory is under version control,
+`vc-dir' doesn't ask for a directory name and uses the VC root directory.
+When a string and `vc-dir' is invoked in a directory outside of
+version control, then this string is used as a default directory name.