From: Jean Louis <bugs@gnu.support>
To: Dr Rainer Woitok <rainer.woitok@gmail.com>
Cc: Help-Gnu-Emacs@Gnu.Org
Subject: Re: (interactive) and &optional
Date: Fri, 24 Mar 2023 12:23:29 +0300 [thread overview]
Message-ID: <ZB1sEYG/tAnPVnwK@protected.localdomain> (raw)
In-Reply-To: <25628.42021.832534.376361@woitok.gmail.com>
* Dr Rainer Woitok <rainer.woitok@gmail.com> [2023-03-23 22:12]:
> Am I really expected in a function that is both, callable from Lisp and
> via "M-x", to code something along the lines of
>
> (cond ((or (null arg) (string-empty-p arg)) 'default-val)
> (arg))
>
> to check whether or not an optional argument has been passed? Are there
> any more elegant ways to achieve this?
I do not like involving `interactive' at all, so I do the handling by
providing optional argument and telling function to check for it, or
ask for it.
(defun search-something (&optional query)
"Search something by using QUERY."
(interactive)
(let* ((query (or query (read-from-minibuffer "Query: "))))
(do-the-search query)))
--
Jean
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next prev parent reply other threads:[~2023-03-24 9:23 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-03-23 19:10 (interactive) and &optional Dr Rainer Woitok
2023-03-23 19:20 ` Philip Kaludercic
2023-03-25 12:35 ` Dr Rainer Woitok
2023-03-25 13:12 ` Philip Kaludercic
2023-03-25 14:33 ` [External] : " Drew Adams
2023-03-25 15:36 ` Dr Rainer Woitok
2023-03-25 16:58 ` Philip Kaludercic
2023-03-23 20:01 ` Emanuel Berg
2023-03-24 9:23 ` Jean Louis [this message]
2023-03-24 20:52 ` Philip Kaludercic
2023-03-24 21:07 ` Emanuel Berg
2023-03-27 1:52 ` [External] : " Drew Adams
2023-03-27 2:40 ` John Yates
2023-03-24 21:42 ` Jean Louis
2023-03-26 1:04 ` Emanuel Berg
2023-03-30 19:04 ` Jean Louis
2023-03-25 12:05 ` Dr Rainer Woitok
2023-03-25 14:32 ` Jean Louis
2023-03-25 15:41 ` Dr Rainer Woitok
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