linux-kernel - Re: [PATCH -mm] documentation: update CodingStyle tips for Emacs users

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Date:	Sat, 05 Jul 2008 11:36:44 +0000
From:	Johannes Weiner <hannes@...urebad.de>
To:	Jonathan Corbet <corbet@....net>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH -mm] documentation: update CodingStyle tips for Emacs users

Hi,

Jonathan Corbet <corbet@....net> writes:

> On Fri, 04 Jul 2008 19:52:16 +0200
> Johannes Weiner <hannes@...urebad.de> wrote:
>
>> +(add-hook 'c-mode-hook
>> +          (lambda ()
>> +            (let ((filename (buffer-file-name)))
>> +              ;; Enable kernel mode for the appropriate files
>> +              (when (and file
>> +                         (string-match "/usr/src/linux" filename))
>
> Shouldn't that be "(and filename ..." rather than "file"?

Whoops, you are right.

> A test for /usr/src/linux seems misplaced, though; I don't think a
> whole lot of people keep their kernel trees there anymore.  There must
> be a better heuristic one can use to figure out whether a kernel source
> file is being edited.

Is this really needed?  I think most people have their kernel trees in
one directory and I used /usr/src/linux explicitely because it is so
well known and whoever reads this snippet knows what to substitute it
for.

But perhaps it should be "~/src/linux-trees/" to emphasize that it it
matches everything descendant from this directory.

A heuristics seems overkill as this snippet is not distributed code that
needs to be portable but it is just a tip for ones .emacs.  I don't want
heuristics in my .emacs if I know exactly where my kernel trees are.

But then, we should remove the check for linux-files completely and make
people use this coding style for every code they write ;)

	Hannes
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