From: Rupert Swarbrick <rswarbrick@gmail.com>
To: help-gnu-emacs@gnu.org
Subject: Re: Detect if Emacs is running in -nw mode
Date: Sun, 30 Mar 2008 06:23:43 -0500 [thread overview]
Message-ID: <iOCdnSxbO8yi5XLanZ2dnUVZ8sjinZ2d@giganews.com> (raw)
In-Reply-To: fsmq1g$8rh$1@registered.motzarella.org
On Sun, 30 Mar 2008 03:22:55 +0200, Christian Herenz wrote:
> Will Parsons schrieb:
>
>>> There is (not ...) ;-)
>>>
>>> (when (not (window-system))
>>> ...)
>>
>> Or how about (unless ...)
>>
>> (unless (window-system)
>> ...)
>>
>>
> So... That should do the trick. One last question, i assume that
> window-system can either be true or false. I searched the help for a
> variable called window-system but I found no explanation? Where do I
> have to search for emacs "system-variables"?
>
> Greets and thanks,
> Christian
Hi,
Two things:
1) In lisp, something referenced like (window-system) is a function
(unless you're in a weird macro, but let's ignore that) and the statement
`` (window-system) '' means call the function called window-system with
no arguments and evaluate to the result(s).
In emacs, looking up functions is different from variables, and you need
to check C-h f <function-name> (it has tab completion, just like C-h v).
The reason that there are two different look-up commands is that in any
lisp-2 (which includes elisp), there are two different lists of symbols:
one for functions and one for variables. Thus I could have a function
called x and also a variable called x and (+ 1 x) and (x "foo") would
both do the right thing. Starting "(" tells the lisp reader that the next
symbol name it's looking at is going to be a function.
2) However, there was actually a typo from Tom Rauchenwald's answer - in
fact is *is* a variable called window-system (I just fired up emacs to
check)
You might want to try C-h v window-system to read the docs for it.
And your code would be:
(unless window-system (menu-bar-mode -1))
Hope this helps!
Rupert
next prev parent reply other threads:[~2008-03-30 11:23 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-03-29 22:37 Detect if Emacs is running in -nw mode Christian Herenz
2008-03-29 22:43 ` Tom Rauchenwald
[not found] ` <mailman.9603.1206831074.18990.help-gnu-emacs@gnu.org>
2008-03-29 23:52 ` Christian Herenz
2008-03-30 0:35 ` Roland Winkler
2008-03-31 2:18 ` Barry Margolin
2008-03-30 0:44 ` Lennart Borgman (gmail)
2008-03-30 1:13 ` Drew Adams
[not found] ` <mailman.9613.1206837866.18990.help-gnu-emacs@gnu.org>
2008-03-30 1:10 ` Will Parsons
2008-03-30 1:22 ` Christian Herenz
2008-03-30 3:34 ` BVK
2008-03-30 11:23 ` Rupert Swarbrick [this message]
2008-03-30 12:17 ` Christian Herenz
2008-03-30 12:43 ` Lennart Borgman (gmail)
[not found] ` <mailman.9635.1206881018.18990.help-gnu-emacs@gnu.org>
2008-03-30 14:24 ` Christian Herenz
2008-03-30 14:45 ` Lennart Borgman (gmail)
2008-03-30 15:13 ` Peter Dyballa
[not found] ` <mailman.9643.1206890035.18990.help-gnu-emacs@gnu.org>
2008-03-30 15:31 ` Christian Herenz
[not found] ` <mailman.9641.1206888365.18990.help-gnu-emacs@gnu.org>
2008-03-30 16:10 ` Rupert Swarbrick
2008-03-30 17:56 ` Christian Herenz
2008-03-31 7:32 ` Nuno J. Silva
2008-03-31 8:11 ` Tim X
2008-03-31 8:34 ` Christian Herenz
2008-03-31 2:22 ` Barry Margolin
2008-03-31 8:38 ` Christian Herenz
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