Setting mode to a temporary buffer

Setting mode to a temporary buffer

[uzibalqa]

I am using the following function to write a message to a temporary buffer.  To set the mode
of the buffer I call (with-current-buffer bfname (org-mode)).  Another alternative is to
add (org-mode) after (pop-to-buffer bfname).

switch-to-buffer uses pop-to-buffer under the hood.  What is the way to do this?  Use 
(pop-to-buffer bfname) followed by (org-mode)?

(defun galaxy-help-show (bfname msg)

  "Makes temporary buffer BFNAME and prints message MSG."

  (when (stringp msg)

    (with-output-to-temp-buffer bfname

      (princ msg))

    (with-current-buffer bfname (org-mode))

    (pop-to-buffer bfname)))

Re: Setting mode to a temporary buffer

[Jean Louis]

* uzibalqa <uzibalqa@proton.me> [2022-08-25 09:33]:
> 
> I am using the following function to write a message to a temporary buffer.  To set the mode
> of the buffer I call (with-current-buffer bfname (org-mode)).  Another alternative is to
> add (org-mode) after (pop-to-buffer bfname).
> 
> switch-to-buffer uses pop-to-buffer under the hood.  What is the way to do this?  Use 
> (pop-to-buffer bfname) followed by (org-mode)?

If it works, why not? Does it work?

-- 
Jean

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Re: Setting mode to a temporary buffer

[uzibalqa]

------- Original Message -------
On Thursday, August 25th, 2022 at 9:28 AM, Jean Louis <bugs@gnu.support> wrote:


> * uzibalqa uzibalqa@proton.me [2022-08-25 09:33]:
> 
> > I am using the following function to write a message to a temporary buffer. To set the mode
> > of the buffer I call (with-current-buffer bfname (org-mode)). Another alternative is to
> > add (org-mode) after (pop-to-buffer bfname).
> > 
> > switch-to-buffer uses pop-to-buffer under the hood. What is the way to do this? Use
> > (pop-to-buffer bfname) followed by (org-mode)?
> 
> 
> If it works, why not? Does it work?
> 
> --
> Jean

Works both ways.  But, if a function ultimately uses another one, it would be better
to use the one that is ultimately used.  Avoids debugging complexity.

Re: Setting mode to a temporary buffer

[Stefan Monnier via Users list for the GNU Emacs text editor]

>     (with-current-buffer bfname (org-mode))
>     (pop-to-buffer bfname)))

`pop-to-buffer` and its friends obey `display-buffer-alist` which can
specify different behaviors depending on the buffer's state such as its
contents and its major mode.

So it's much better to set the major mode before calling `pop-to-buffer`
(like you've done above) than the reverse.


        Stefan