Messages in el functions & the Mini-Buffer

Messages in el functions & the Mini-Buffer

[Christopher Dimech]

When I introduce (message "Fuckup") in an Elisp function, does it always use the
mini-buffer?  Is there a command to output in a window buffer like when I use
M-x describe function?

Re: Messages in el functions & the Mini-Buffer

[tomas]

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On Wed, Oct 28, 2020 at 11:26:31AM +0100, Christopher Dimech wrote:
> 
> When I introduce (message "Fuckup") in an Elisp function, does it always use the
> mini-buffer?  Is there a command to output in a window buffer like when I use
> M-x describe function?

It (usually) goes to a buffer: this buffer is called *Messages*. You can switch
to it like to every other buffer, e.g. with C-x b<RET>*Messages*<RET>

What is a "window buffer"?

Cheers
 - t

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Re: Messages in el functions & the Mini-Buffer

[Christopher Dimech]

Very good. Have been trying to write (message "%end-of-fuckup")
and a problem crops up when trying to display the '%' symbol.



> Sent: Wednesday, October 28, 2020 at 11:44 AM
> From: tomas@tuxteam.de
> To: help-gnu-emacs@gnu.org
> Subject: Re: Messages in el functions & the Mini-Buffer
>
> On Wed, Oct 28, 2020 at 11:26:31AM +0100, Christopher Dimech wrote:
> >
> > When I introduce (message "Fuckup") in an Elisp function, does it always use the
> > mini-buffer?  Is there a command to output in a window buffer like when I use
> > M-x describe function?
>
> It (usually) goes to a buffer: this buffer is called *Messages*. You can switch
> to it like to every other buffer, e.g. with C-x b<RET>*Messages*<RET>
>
> What is a "window buffer"?
>
> Cheers
>  - t
>

Re: Messages in el functions & the Mini-Buffer

[Joost Kremers]

On Wed, Oct 28 2020, Christopher Dimech wrote:
> Very good. Have been trying to write (message "%end-of-fuckup")
> and a problem crops up when trying to display the '%' symbol.

That's because the string passed to `message` is a format string, as with the
function `format`. See the documentation strings of `message` and `format` for
details.

>> > When I introduce (message "Fuckup") in an Elisp function, does it always use the
>> > mini-buffer?  Is there a command to output in a window buffer like when I use
>> > M-x describe function?

You can use the macro `with-help-window` to get an effect similar to `describe-function`. 

-- 
Joost Kremers
Life has its moments

Re: Messages in el functions & the Mini-Buffer

[Michael Heerdegen]

Joost Kremers <joostkremers@fastmail.fm> writes:

> You can use the macro `with-help-window` to get an effect similar to
> `describe-function`.

Another alternative: `display-message-or-buffer'.

Michael.

Re: Messages in el functions & the Mini-Buffer

[Emanuel Berg via Users list for the GNU Emacs text editor]

Christopher Dimech wrote:

> When I introduce (message "Fuckup")

...

> in an Elisp function, does it always use the mini-buffer? Is there
> a command to output in a window buffer like when I use M-x
> describe function?

You can write such a general command, by studying this function:

(defun print-roll-outs (chainrings sprockets bsd tire)
  (let ((out-buffer (get-buffer-create "*gears*")))
    (with-current-buffer out-buffer
      (goto-char (point-max))
      (print-intro-data chainrings sprockets bsd tire)
      (let ((ros (all-roll-outs chainrings sprockets bsd tire)))
        (cl-loop for ro in ros do
                 (let ((c (   car   ro))
                       (s (   cadr  ro))
                       (r (cl-caddr ro)))
                   (insert (format "% 9d% 14d% 15.0f\n" c s r)) ))))
    (pop-to-buffer out-buffer) ))

In particular, `get-buffer-create', `with-current-buffer', `insert',
and `pop-to-buffer'.

Half source:

  https://dataswamp.org/~incal/emacs-init/bike.el

-- 
underground experts united
http://user.it.uu.se/~embe8573
https://dataswamp.org/~incal