[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: Interesting problem: eval-after-load and local variables

From: Kevin Rodgers
Subject: Re: Interesting problem: eval-after-load and local variables
Date: Tue, 16 Oct 2012 21:23:56 -0600
User-agent: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.4; en-US; rv: Gecko/20120306 Thunderbird/3.1.20

On 10/16/12 2:02 AM, Sebastien Vauban wrote:
In order to speed up my Emacs startup, I've put many customizations in
eval-after-load's, such as:

--8<---------------cut here---------------start------------->8---
   (eval-after-load "time-stamp"
        ;; format of the string inserted by `M-x time-stamp'
        (setq time-stamp-format "%:y-%02m-%02d %3a %02H:%02M %u")))
--8<---------------cut here---------------end--------------->8---

in order to avoid the require itself in the .emacs file.

In general, it is not necessary to load a library before customizing its global
options.  You should get the desired effect with just:

(setq time-stamp-format "%:y-%02m-%02d %3a %02H:%02M %u")

Now, this causes a problem, as my local variable customizations aren't
respected anymore.

For example, I have the following local vars in my file `common.sty' to set up
the format of the time-stamp (à la LaTeX):

--8<---------------cut here---------------start------------->8---
%% common.sty -- LaTeX common commands and environments

\ProvidesPackage{common}[2012/10/15 v1.0 Common stuff between documents and 

% ...

%% End of package
\endinput % very last line

% Local Variables:
% time-stamp-format: "%:y/%02m/%02d"
% time-stamp-start: "Provides\\(Class\\|Package\\){[a-zA-Z-]+}\\["
% time-stamp-end: " "
% End:
--8<---------------cut here---------------end--------------->8---

The problem is the following:

- Upon opening the file, Emacs sees it needs to load time-stamp.

I don't see how, since those variables aren't autoloaded.  (Their autoload
cookies only result in the safe-local-variable property being dumped into the
emacs executable for each symbol.)  I suspect you have enabled time stamp as
documented in the Emacs manual:

   Then add the hook function `time-stamp' to the hook
`before-save-hook'; that hook function will automatically update the
time stamp, inserting the current date and time when you save the file.

(The function time-stamp is autoloaded.)

- It does it (via the predefined autoloads), but the eval-after-load overrides
   the local variables' value.

Yes, because the eval-after-load form is apparently evaluated while the
common.sty buffer is current, and the file local variable section has already
made each variable local to that buffer.

- When saving the file, the time-stamp format provided in local vars is NOT

Actually, I think the file local variables are applied and then overridden by
the eval-after-load form (but only for the first file that you save).  Do other
files with time stamp templates work as intended?

In a way, that's perfectly normal. In another, not at all: I would expect the
local vars to win over the wide values, in any configuration (even if my setq
were in an eval-after-load construct).

What do you think?

I think you should either skip the eval-after-load boilerplate, or use
setq-default in the eval-after-load form as suggested by Michael.

Kevin Rodgers
Denver, Colorado, USA

reply via email to

[Prev in Thread] Current Thread [Next in Thread]