Passing arguments to Elisp function

Passing arguments to Elisp function

[jai-bholeki via Users list for the GNU Emacs text editor]

I have a function gets the beginning and end of a region.

Is is possible to pass another argument to the function that is a character 'ch'?

(defun pengo (beg end)
(interactive "r") ; Specifies Mark and Point, smallest first
(goto-char beg)
)

Re: Passing arguments to Elisp function

[Jean Louis]

* jai-bholeki via Users list for the GNU Emacs text editor <help-gnu-emacs@gnu.org> [2020-11-01 19:56]:
> I have a function gets the beginning and end of a region.
> 
> Is is possible to pass another argument to the function that is a character 'ch'?
> 
> (defun pengo (beg end)
> (interactive "r") ; Specifies Mark and Point, smallest first
> (goto-char beg)
> )

Make the function ask user for additional character before goto-char
probably.

(read-char-from-minibuffer "Char: ")

If you need more than char read-from-minibuffer

You may explore which read functions exist by:

C-h f read-TAB and you may see various, not all are useful for that
case. You get information about the function with C-h f

-- 
There are 50 messages yet in my incoming mailbox.

Re: Passing arguments to Elisp function

[tomas]

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On Sun, Nov 01, 2020 at 04:54:55PM +0000, jai-bholeki via Users list for the GNU Emacs text editor wrote:
> I have a function gets the beginning and end of a region.
> 
> Is is possible to pass another argument to the function that is a character 'ch'?
> 
> (defun pengo (beg end)
> (interactive "r") ; Specifies Mark and Point, smallest first
> (goto-char beg)
> )

You mean something like this?

  (defun foo (beg end ch)
    (interactive "rRegion:\ncChar:")
    (message "Region: (%d, %d) Char: %c" beg end ch))

(i.e. separate consecutive args in the interactive specification with
a new line, `\n').

Cheers
 - t

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Re: Passing arguments to Elisp function

[jai-bholeki]

Correct.  Got it

Cheers.


‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
On Sunday, 1 November 2020 21:59, <tomas@tuxteam.de> wrote:

> On Sun, Nov 01, 2020 at 04:54:55PM +0000, jai-bholeki via Users list for the GNU Emacs text editor wrote:
>
> > I have a function gets the beginning and end of a region.
> > Is is possible to pass another argument to the function that is a character 'ch'?
> > (defun pengo (beg end)
> > (interactive "r") ; Specifies Mark and Point, smallest first
> > (goto-char beg)
> > )
>
> You mean something like this?
>
> (defun foo (beg end ch)
> (interactive "rRegion:\ncChar:")
> (message "Region: (%d, %d) Char: %c" beg end ch))
>
> (i.e. separate consecutive args in the interactive specification with
> a new line, `\n').
>
> Cheers
>
> -   t