GNU bug report logs - #2470
23.0.90; auto-fill-mode, :minor-mode-function

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From: Stefan Monnier <monnier <at> IRO.UMontreal.CA>
To: Drew Adams <drew.adams <at> oracle.com>
Cc: 2470 <at> debbugs.gnu.org, <emacs-pretest-bug <at> gnu.org>
Subject: bug#2470: 23.0.90; auto-fill-mode, :minor-mode-function
Date: Wed, 25 Feb 2009 14:56:44 -0500

> So it seems to be in need of a fix, but I see no bug filed against it.

Then file one.

> 2. What is :minor-mode-function?  It is used in a couple of places in
> the Emacs Lisp sources, with no comment or other explanation.  It is
> not in the Elisp manual.  It seems to be a way to associate a
> different function with a minor mode - a function with a different
> name from the mode itself.  For example, `auto-fill-function' is the
> :minor-mode-function for `auto-fill-mode'.
 
> Is this mechanism still needed if `define-minor-mode' is used?  Is it
> just for compatibility with XEmacs code and legacy code?

It's got nothing to do with XEmacs, AFAIK, but it does have with legacy
code such as auto-fill-function.
 
> How about documenting it - at least with a comment in the code
> somewhere: what is for, how and when to use it.
 
When to use it, is easy: never in new code.


        Stefan

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