From: "Davis Herring" <herring@lanl.gov>
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: Thu, 9 Apr 2009 08:26:57 -0700 (PDT) [thread overview]
Message-ID: <33049.128.165.123.18.1239290817.squirrel@webmail.lanl.gov> (raw)
In-Reply-To: <d2afcfda0904081931n1f0d48fbo1253c6af08cd4bbc@mail.gmail.com>
>> First, you need to quote your variable names:
> Prob. but in this case, once the variable is set (evaluated) I don't :P
>
> (longlines-mode)
> (buffer-local-value longlines-mode (current-buffer)) => t
> (longlines-mode)
> (buffer-local-value longlines-mode (current-buffer)) => nil
Because you are only using (current-buffer), you are missing something
rather important. `buffer-local-value' is a function, so its arguments
are evaluated before it is even called. What you have done is equivalent
to
(buffer-local-value 't (current-buffer))
(buffer-local-value 'nil (current-buffer))
because t and nil are the values that `longlines-mode' has each time you
check. (Of course, you do not normally quote t and nil, but this is the
formally equivalent thing.)
Since t and nil are constants that are their own values (which is why you
don't quote them!), their value in any buffer is themselves, so you just
get them back from `buffer-local-value'. If you try doing something like
(longlines-mode)
(buffer-local-value longlines-mode (get-buffer-create "*other*"))
(longlines-mode)
(buffer-local-value longlines-mode (get-buffer-create "*other*"))
you will _still_ get t and then nil, because the other buffer is entirely
irrelevant to the _value_ of `longlines-mode' (which is implicitly derived
from the current buffer). If instead you try
(longlines-mode)
(buffer-local-value 'longlines-mode (get-buffer-create "*other*"))
(longlines-mode)
(buffer-local-value 'longlines-mode (get-buffer-create "*other*"))
...you will get nil twice, because calling `longlines-mode' in this buffer
doesn't change its value in *other*.
Davis
--
This product is sold by volume, not by mass. If it appears too dense or
too sparse, it is because mass-energy conversion has occurred during
shipping.
next prev parent reply other threads:[~2009-04-09 15:26 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 [this message]
[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
2009-04-10 22:10 ` Stefan Monnier
2009-04-16 21:29 ` Davis Herring
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