Re: Auto-Prompt for Password and Raise Privilegies when needed

[Nordlöw]

On May 4, 4:00 pm, quodlibetor <quodlibe...@gmail.com> wrote:
> > Sounds trivial. Though this may not scale well with other hooks.
>
> > (defun find-file-maybe-change-me ()
> >   (when (not (file-writable-p buffer-file-name))
> >     (find-alternate-file
> >      (format "/sudo::%s" buffer-file-name))))
>
> > (add-hook 'find-file-hook 'find-file-maybe-change-me)
>
> I think what Per was looking for was more something along the lines of
>
> (defun edit-read-only-file-maybe ()
>   (when (y-or-n-p "file is read-only, raise privileges to edit? ")
>     (find-alternate-file
>      (format "/sudo::%s" buffer-file-name))))
>
> (add-hook 'first-edit-read-only-file-hook 'edit-read-only-file-maybe)
>
> with the main problem being that `first-edit-read-only-file-hook'
> doesn't exist, and there don't seem to be any analogs. Or at least I
> can't find them.

You are right! This is what I was looking for.

But as you say, the first-edit-read-only-file-hook still remains to be
implemented. For now we could advice
- self-insert-command
- delete-char, delete-word, etc.
- tranpose, etc.
of course it is impossible to keep track of all these functions.

We should add a hook somewhere in the c sources that detects any
buffer modifications. Something for the Emacs developers...

We could of course also make the query a bit more clever;
  Query for permission-change only if we open a that is read-only by
me but writable by another user or group.

But