From: Tim X <timx@nospam.dev.null>
To: help-gnu-emacs@gnu.org
Subject: Re: elisp: can a function/defun return two strings..? prompt for two strings??
Date: Mon, 28 Feb 2011 08:10:49 +1100 [thread overview]
Message-ID: <87lj1118va.fsf@puma.rapttech.com.au> (raw)
In-Reply-To: mailman.2.1298798656.16925.help-gnu-emacs@gnu.org
ken <gebser@mousecar.com> writes:
> In one line of a file/buffer (which might exist or might not) will be
> two strings, both of which must be fetched and returned to the calling
> function. I was going to write two separate functions, one for each
> string, but since both strings are in the same line, it seemed highly
> inefficient to search for the same line of text twice... made more sense
> to search for it once, and get both strings in the same function.
>
> Here's pseudo-code:
>
> ;; search buffer for line of interest.
> ;; if the line exists
> ;; does it specify str1?
> ;; if it does, grab that str1, hold it for eventual return
> ;; if it doesn't, prompt user for it, and hold it for eventual return.
> ;; does the same line specify str2?
> ;; if it does, grab that str2, hold it for eventual return
> ;; if it doesn't, prompt user for it, and hold it for eventual return.
> ;; if the line doesn't exist,
> ;; prompt user for str1 and str2
> ;; create/insert new line in buffer, inserting str1 & str2 into it.
> ;; return str1 and str2 to calling function
>
> Most of the coding for the above will busy itself with finding the line
> of interest-- or determining that it doesn't exist. So why should I do
> that twice, once for each string? Sure, I could save to a variable the
> location of the line of interest to avoid having to search for it again,
> but then I'm back to working with two variables, the location and just
> one string. So that's a non-solution.
>
> So how to "return" two variables to a calling function, possibly have to
> prompt for one or both of them? (I can think of a half dozen ways to do
> this in C, but this is elisp.)
>
>
Just return the strings as a list of two strings i.e.
(list str1 str2)
Tim
--
tcross (at) rapttech dot com dot au
next prev parent reply other threads:[~2011-02-27 21:10 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <mailman.2.1298798656.16925.help-gnu-emacs@gnu.org>
2011-02-27 10:31 ` elisp: can a function/defun return two strings..? prompt for two strings?? Harald Hanche-Olsen
2011-02-27 11:07 ` Pascal J. Bourguignon
2011-02-27 21:10 ` Tim X [this message]
2011-02-27 9:24 ken
2011-02-27 10:39 ` Andrea Crotti
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