From: Eric Abrahamsen <eric@ericabrahamsen.net>
To: help-gnu-emacs@gnu.org
Subject: Re: Dude where is my car ?
Date: Sat, 26 May 2012 10:51:26 +0800 [thread overview]
Message-ID: <87aa0v4pu9.fsf@ericabrahamsen.net> (raw)
In-Reply-To: lz1um727gh.wl%philippe.coatmeur@gmail.com
On Sat, May 26 2012, Philippe M. Coatmeur wrote:
> Hi everyone ;
>
> I have this function that loops trough a list of lists of email
> elements to extract them. The list looks like this :
>
> (("<test@adamweb.net>" "Fri, 25 May 2012 23:49:58 +0200" "Re: plopz" "1648")
> ("contact <plop@gmail.com>" "Fri, 25 May 2012 22:21:49 +0000" "tst" "1647"))
>
> (This is what you get if you C-h v with point over mail-bug-unseen-mails-one)
>
> (defun mail-bug-desktop-notify-one ()
> (mapcar
> (lambda (x)
> (if (not (member x mail-bug-advertised-mails-one))
> (progn
> (mail-bug-desktop-notification
> "Mew mail!"
> (format "%s %s %s" ;; Produces the values below
> (car (nthcdr 1 x)) ;; Fri, 25 May 2012 23:49:58 +0200
> (car (nthcdr 2 x)) ;; Re: plopz
> (car (nthcdr 3 x))) ;; 1648
> "500000" mail-bug-new-mail-icon-one)
> (add-to-list 'mail-bug-advertised-mails-one x))))
> mail-bug-unseen-mails-one))
>
> And this works fine, so it follows that (car (car x)) is the first
> element of each atomic list, right ? but when I try to extract it
> emacs (24.1.50 cvs) insults me!? I spent more than a good hour trying
> to figure this out
>
> (format "%s %s %s"
> (car (car x)) ;; Should produce <test@adamweb.net>
> (car (nthcdr 2 x)) ;; Re: encor un autre
> (car (nthcdr 3 x))) ;; 1643
>
> error in process sentinel: format: Wrong type argument: listp, "<test@adamweb.net>"
> error in process sentinel: Wrong type argument: listp, "<test@adamweb.net>"
Since x equals ("<test@adamweb.net>" "Fri, 25 May 2012 23:49:58 +0200"
"Re: plopz" "1648") in your second example, the car of that is
"<test@adamweb.net>", and you can't take the car of that again, because
it fails to pass the listp test. I think where you're going wrong is
that nthcdr returns a list, so you can car it. Car itself returns an
atom, so you can't.
Have I got that right?
Also, the whole thing might be easier to read/debug if you use "first"
"second" "third" "fourth" to extract the list elements. Or, if that
seems too unscientific, then "nth", that also pulls a single element out
of a list.
Eric
--
GNU Emacs 24.1.50.1 (i686-pc-linux-gnu, GTK+ Version 2.24.10)
of 2012-05-25 on pellet
next prev parent reply other threads:[~2012-05-26 2:51 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-05-25 22:59 Dude where is my car ? Philippe M. Coatmeur
2012-05-26 2:51 ` Eric Abrahamsen [this message]
2012-05-26 14:04 ` Stefan Monnier
[not found] ` <mailman.1688.1338000714.855.help-gnu-emacs@gnu.org>
2012-05-26 19:00 ` Philippe M. Coatmeur
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