From: David Kastrup <David.Kastrup@t-online.de>
Subject: Re: multi-line conditionals in elisp
Date: 22 Dec 2002 20:12:42 +0100 [thread overview]
Message-ID: <x5smwphnpx.fsf@lola.goethe.zz> (raw)
In-Reply-To: ulm2hc1zw.fsf@trollope.org
Michael Powe <michael+gnus@trollope.org> writes:
> sorry for the dumb question, but i'm sure of the best way to do
> this. i have emacs installed on several machines and would like to use
> a single .emacs. it's annoying to have to maintain different ones,
> and i forget sometimes that one library is installed on one machine
> but not on another.
>
> my solution was to put a conditional in the .emacs to test for the
> existence of a library before following its loading instructions.
> what i'm having a problem with, is conditionals of this format:
>
> if (true)
> do item one
> do item two
> do item three
> ...
> else
> do item four
>
> this is trivial in other languages, but not, it seems, in elisp. (i
> think it's just a case of, i don't really understand the language.)
> here's what i did:
>
> (if (locate-library "python-mode")
> (cond((autoload 'python-mode "python-mode" "Python editing mode" t)
> (setq auto-mode-alist
> (cons '("\\.py$" . python-mode) auto-mode-alist))))
> (message "python library not found"))
That is junk. I recommend you look up progn.
> nb. trivial note: on my main workstation, i maintain my dot-files in
> rcs. i noted yesterday that my oldest entry in the .emacs is from
> january 30, 1998. so, in a little over a month, it will be 5 years
> old. that's a lot of bits & bytes through the pipe.
5 years and you don't know progn. That certainly _is_ impressive.
--
David Kastrup, Kriemhildstr. 15, 44793 Bochum
next prev parent reply other threads:[~2002-12-22 19:12 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-12-22 19:00 multi-line conditionals in elisp Michael Powe
2002-12-22 19:12 ` David Kastrup [this message]
2002-12-22 22:48 ` Michael Powe
2002-12-22 23:05 ` David Kastrup
2002-12-24 3:17 ` Jesper Harder
[not found] ` <michael+gnus@trollope.org>
2002-12-22 19:21 ` Peter S Galbraith
[not found] ` <mailman.524.1040584903.19936.help-gnu-emacs@gnu.org>
2002-12-22 22:40 ` Michael Powe
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