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Re: Argument-list in function with variable number of arguments...


From: Kevin Rodgers
Subject: Re: Argument-list in function with variable number of arguments...
Date: Fri, 20 May 2005 09:15:33 -0600
User-agent: Mozilla Thunderbird 0.9 (X11/20041105)

address@hidden wrote:
> Is there a way to have a variable number of arguments in
> a function argument-list?
> I know how to write a function in which a fixed number of arguments
> is expected for ex.
>
> ( defun my-function ( first second )
>    (interactive "sFirst : \nsSecond : ")
>    (insert ""first"\n"
>                 ""second"\n")
> )

See the Lambda Expressions node of the Emacs Lisp manual.

> So I'm asked for "first" and for "second"...and my-function
> inserts the two of them in a buffer.
> I would like to have more arguments (let's say n) and being
> asked for them interactively, for instance:
> How many arguments? : 5 <Ret>
> First : first_argument <Ret>
> Second : second_argument <Ret>
> Third : third_argument <Ret>
> ...and so on without knowing their number in advance.

If you don't know how many there are, you can't name them individually.

(defun your-function (&rest argument-list)
  (interactive
   (let* ((n (read (read-from-minibuffer "How many arguments? ")))
          (i 0)
          (args '()))
     (while (< i n)
       (setq args
             (cons (read-from-minibuffer (format "Argument %d: "
                                                 (setq i (1+ i))))
                   args)))
     args))
  ...)

--
Kevin Rodgers





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