bug#54100: 29.0.50; Allow project-buffers to ignore some buffers

[Dmitry Gutov]

On 25.02.2022 08:44, Manuel Uberti via Bug reports for GNU Emacs, the 
Swiss army knife of text editors wrote:
> On 25/02/22 03:33, Dmitry Gutov wrote:
> > Doesn't this mean that it won't do the (memq ... buffers) check and 
> > thus ignore the result of the (project-buffers pr) call?
> >
> > Instead, it could be a lambda like
> >
> >            (lambda (buffer)
> >              ;; BUFFER is an entry (BUF-NAME . BUF-OBJ) of Vbuffer_alist.
> >              (and (memq (cdr buffer) buffers)
> >                   (funcall predicate buffer)))
> >
> > Does that make sense?
>
> Totally, thank you!
>
> > (I would also try to shorten the new defcustom's docstring by 
> > referring to the existing one, but I can make that change myself.)
>
> Done.

Very good.

Looking at it more thoroughly, though, shouldn't we simply inline the 
check added to project-switch-to-buffer to the function 
project--read-project-buffer?

It's used by two other related commands (project-display-buffer and 
project-display-buffer-other-frame), and users would probably expect 
them to have the same filtering.

project-ignore-buffer-conditions's docstring can be updated accordingly.

> > Or if you wanted to stay on "or" but make it easier for certain usage 
> > pattern, you could call the var 'project-ignore-buffer-conditions' (or 
> > "hide" or etc), and change its use appropriately. Then the value could 
> > contain
> >
> >    '((not mu-project-buffer-p)
> >      (derived-mode . comint-mode))
> >
> > ...and (not mu-project-buffer-p) could obviously be rewritten in a 
> > negated way in the function's definition.
>
> I followed your suggestion and used `project-ignore-buffer-conditions' 
> in the attached patch.
>
> Now everything works as expected when I use this:
>
> (defun mu-project-ignore-buffer-p (buffer)
>    "Check if BUFFER is a member of `mu-ignored-buffers'."
>    (seq-contains-p mu-ignored-buffers (buffer-name buffer) 
> #'string-match-p))
>
> (setq-default project-ignore-buffer-conditions '(mu-project-ignore-buffer-p
>                                                   (derived-mode . 
> dired-mode)))
>
>
> Again, thank you for the help on this.

No problem!