From: Chong Yidong <cyd@stupidchicken.com>
To: MON KEY <monkey@sandpframing.com>
Cc: emacs-devel@gnu.org
Subject: Re: with a fresh emacs "(buffer-local-value fundamental-mode (current-buffer))" error.
Date: Fri, 10 Apr 2009 13:38:19 -0400 [thread overview]
Message-ID: <87ocv4flys.fsf@cyd.mit.edu> (raw)
In-Reply-To: <d2afcfda0904100953j371d41b8l9b31df92e1ab7f99@mail.gmail.com> (MON KEY's message of "Fri, 10 Apr 2009 12:53:02 -0400")
MON KEY <monkey@sandpframing.com> writes:
>> If you need to detect (and not just suppress) longlines-mode without
>> having to load it, you can do bound-and-true-p 'longlines-mode)
This should be (bound-and-true-p longlines-mode), because the
bound-and-true-p macro treats its VAR argument like setq; it is a macro,
not an ordinary Lisp function. Its docstring needs to be
corrected---I'll do this once I when I get the chance.
> Which leads me to suspect that I went down this route at some point in
> the past found there were 'issues' with qouting around longlines-mode
> with regards symbol vs. variable state and _might_ explain my funky
> quoting.
It sounds like you have some confusions about the difference between a
symbol and a variable. I suggest reading the first few chapters of the
Emacs Lisp reference manual, which explains this topic carefully.
> What prob. will work is to test if symbol both symbol _and_ var are
> available:
>
> (and (boundp 'longlines-mode) (bound-and-true-p longlines-mode))
It's not necessary to use bound-and-true-p here.
(bound-and-true-p longlines-mode)
is _exactly_ the same as
(and (boundp 'longlines-mode) longlines-mode)
(That's simply how the bound-and-true-p macro is defined.)
next prev parent reply other threads:[~2009-04-10 17:38 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-04-08 21:58 with a fresh emacs "(buffer-local-value fundamental-mode (current-buffer))" error MON KEY
2009-04-08 22:15 ` Jason Rumney
2009-04-09 2:22 ` MON KEY
2009-04-09 5:12 ` Kevin Rodgers
2009-04-08 22:32 ` Davis Herring
[not found] ` <d2afcfda0904081931n1f0d48fbo1253c6af08cd4bbc@mail.gmail.com>
2009-04-09 15:26 ` Davis Herring
[not found] ` <d2afcfda0904091341j6b1194a1ifb522b99535139f9@mail.gmail.com>
2009-04-09 22:42 ` Davis Herring
2009-04-10 3:12 ` MON KEY
2009-04-16 21:49 ` Davis Herring
2009-04-10 16:53 ` MON KEY
2009-04-10 17:38 ` Chong Yidong [this message]
2009-04-10 22:10 ` Stefan Monnier
2009-04-16 21:29 ` Davis Herring
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