linux-kernel - Re: condingstyle, was Re: utrace comments

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Message-ID: <m1y7k8x910.fsf@ebiederm.dsl.xmission.com>
Date:	Tue, 01 May 2007 20:18:51 -0600
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	David Howells <dhowells@...hat.com>
Cc:	"John Anthony Kazos Jr." <jakj@...-k-j.com>,
	David Woodhouse <dwmw2@...radead.org>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Satyam Sharma <satyam.sharma@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Christoph Hellwig <hch@...radead.org>,
	Roland McGrath <roland@...hat.com>,
	Christoph Hellwig <hch@....de>, linux-kernel@...r.kernel.org,
	linux-arch@...r.kernel.org
Subject: Re: condingstyle, was Re: utrace comments

David Howells <dhowells@...hat.com> writes:

> John Anthony Kazos Jr. <jakj@...-k-j.com> wrote:
>
>> 	if (veryverylengthycondition1
>> 		&& smallcond2
>> 		&& (conditionnumber3a
>> 			|| condition3b)) {
>> 		...
>> 	}
>> 
>> Clear, crisp, and 80-wide. I also like how the logical operator on the 
>> following line is indented slightly into the condition of the previous 
>> line.
>
> The brain works better when associated things are lined up, so:
>
> 	if (veryverylengthycondition1 &&
> 	    smallcond2 &&
> 	    (conditionnumber3a ||
> 	     condition3b)) {
>
> is better as it gives a visual clue to association.

Not lining up with the code following the if statement is also
a plus.  Because it clearly delineates the conditions from the code.

Of course in many cases conditions this complex are candidates for

if (!condition1)
	continue;
if (!condition2)
	continue;
if (!condition3a && !condition3b)
	continue;

Eric
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