Re: Making a function than can only be used interactively

[carlmarcos--- via Users list for the GNU Emacs text editor <help-gnu-emacs@gnu.org>]

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Jul 7, 2022, 21:28 by incal@dataswamp.org:

> carlmarcos--- via Users list for the GNU Emacs text editor wrote:
>
>>> A word such as "interactive" has different meanings.
>>>
>>
>> What different meanings?
>>
>
> So interactive/non-interactive 101 ...
>
> M-x - that's interactive
>
> Keystroke - interactive!
>
> "interactive" means (interactive "nX: \n") is used to assign
> the argument values to the formal parameters.
>
> Compare "from Lisp" or non-interactive use which looks like
> this:
>
> (from-lisp x) - non-interactive, i.e. (interactive "...")
> isn't used, but you see that x is provided so no worries.
>
> A function that is interactive is also called a command!
>
> That's all I know ... what more do you want?
>

I want to know a few specific things.  If I want to use the prefix argument, I should include
a variable in the argument list, right?  Let us call the variable "prefix".  Now, should the prefix
 be  mandatory or optional?  Should it always be the first argument?  

(defun funname (prefix arg-a arg-b)
  "docstring"
  (interactive "P\ns Name:\n s City")
  (message "executed funname"))


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>
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>