bug#70707: 30.0.50; [PATCH] ; Check the process param in function (python-shell-completion-at-point)

[Lin Sun]

On Mon, May 6, 2024 at 3:12 PM kobarity <kobarity@gmail.com> wrote:
>
>
> Lin Sun wrote:
> >
> > > Hi,
> > >
> > > There is an unexpected error message happening with function
> > > `python-shell-completion-at-point`.
> > > > Wrong type argument: processp, nil
> > > It happened because the function does NOT check the process param.
> > > The patch will check the param and display a user error message 
> > > gracefully.
> > >
> > > Steps to reproduce the issue.
> > > 1. $ emacs -q /tmp/a.py # start emacs and open a python source file
> > > 2. type "C-c C-p" (or M-x run-python) to start a python shell
> > > 3. type exit() to stop the python process but the buffer still exists
> > > 4. Switch to *python* buffer, then M-x
> > > python-shell-completion-at-point  will get the error message
> > >
> > > Please help review the patch. Thanks. Regards
> > >
> > >
> > > From aa44c95c7f13f2d68be83260e618cf4d806b313b Mon Sep 17 00:00:00 2001
> > > From: Lin Sun <sunlin7@hotmail.com>
> > > Date: Wed, 1 May 2024 06:55:31 +0000
> > > Subject: [PATCH] ; Check the process param in function
> > >  (python-shell-completion-at-point)
> > >
> > > * lisp/progmodes/python.el (python-shell-completion-at-point):
> > >   Check the process param at the beginning of the function.
> > > ---
> > >  lisp/progmodes/python.el | 2 ++
> > >  1 file changed, 2 insertions(+)
> > >
> > > diff --git a/lisp/progmodes/python.el b/lisp/progmodes/python.el
> > > index d6c29e5ffc..4b2e2f8215 100644
> > > --- a/lisp/progmodes/python.el
> > > +++ b/lisp/progmodes/python.el
> > > @@ -4708,6 +4708,8 @@ python-shell-completion-at-point
> > >  Optional argument PROCESS forces completions to be retrieved
> > >  using that one instead of current buffer's process."
> > >    (setq process (or process (get-buffer-process (current-buffer))))
> > > +  (unless process
> > > +    (user-error "No active python inferior process"))
> > >    (let* ((is-shell-buffer (derived-mode-p 'inferior-python-mode))
> > >           (line-start (if is-shell-buffer
> > >                           ;; Working on a shell buffer: use prompt end.
> > > --
> > > 2.20.5
> >
> > Hi Kobarity, Please help review the patch for checking process and
> > emitting user-error when it's not available. Thanks.
>
> Hi Lin,
>
> The patch itself looks good to me.
>
> > > 4. Switch to *python* buffer, then M-x
> > > python-shell-completion-at-point  will get the error message
>
> As `python-shell-completion-at-point' is not an interactive function,
> I tested with M-x complete-symbol.
Hi Kobarity,
Thanks for confirming! And yes, the complete-symbol is the interactive
function which will be called the `python-shell-completion-at-point'.

Hi Eli,
Please  help merge the patch. Thanks.