How users start programming in Emacs Lisp...

[Christopher Dimech <dimech@gmx.com>]

---------------------
Christopher Dimech
General Administrator - Naiad Informatics - GNU Project (Geocomputation)
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> Sent: Monday, May 31, 2021 at 3:54 AM
> From: "Jean Louis" <bugs@gnu.support>
> To: "Christopher Dimech" <dimech@gmx.com>
> Cc: help-gnu-emacs@gnu.org
> Subject: Re: How users start programming in Emacs Lisp...
>
> * Christopher Dimech <dimech@gmx.com> [2021-05-30 16:55]:
> > > How exactly do you wish to play with the name? Which name? Is it
> > > buffer name?
> > 
> > The first optional parameter "name", which looks like it is the
> > buffer name.
> 
> Sorry, I was using that long time without observing.
> 
> > When I use "C-u F5" you can only set the mode, but if name is
> > already set, the code suggests that it will use it.  But does not,
> > because the let variable "buffer" is not set.
> 
> There is main name and sub-name.
> 
> Here now you can customize it:
> 
> ;;;; ↝ RCD TEMPORARY BUFFERS
> 
> (defvar rcd-temp-buffer-mode-history nil)
> 
> ;; You may customize the main name here:
> (defvar rcd-temp-buffer-name "RCD TEMPORARY BUFFER")
> 
> ;; You may customize the modes you wish to get asked with prefix C-u:
> (defvar rcd-temp-buffer-modes '("adoc-mode" "emacs-lisp-mode" "lisp-mode" "markdown-mode"
> 				"org-mode" "sql-mode" "fundamental-mode" "html-mode"))
> 
> (defun rcd-temp-buffer (&optional name mode)
>   (interactive "p")
>   (let* ((format (concat "*" rcd-temp-buffer-name "%s%s*"))
> 	 (buffer (if name (format format ": " name) (format format "" ""))))
>     (switch-to-buffer (generate-new-buffer buffer))
>     (if current-prefix-arg
> 	(let* ((mode (completing-read
> 		      "Mode: "
> 		      rcd-temp-buffer-modes nil t nil 'rcd-temp-buffer-mode-history)))
> 	  (funcall (intern mode)))
>       (funcall (intern (or mode "fundamental-mode"))))))
> 
> (defun rcd-temp-buffer-destroy-em ()
>   (interactive)
>   (kill-matching-buffers "RCD TEMPORARY BUFFER"))
> 

I am having some problem figuring out what the following does, having format 
repeated twice.

(format format ": " name) 

 
> -- 
> Jean
> 
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