linux-kernel - Re: [patch v4] checkpatch: Signature format verification

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Date:	Fri, 27 May 2011 13:37:28 -0700
From:	Joe Perches <joe@...ches.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	anish singh <anish198519851985@...il.com>,
	Manish Kumar Singh <man.k1983@...il.com>, davej@...hat.com,
	apw@...dowen.org, akpm@...ux-foundation.org, vapier@...too.org,
	linux-kernel@...r.kernel.org
Subject: Re: [patch v4] checkpatch: Signature format verification

On Fri, 2011-05-27 at 16:18 -0400, Steven Rostedt wrote:
> On Sat, 2011-05-28 at 01:24 +0530, anish singh wrote:
> >         Anish, do you have a response to this?
> > Your approach is correct but i am trying to do in my own way.
> Why?? Correct is more important than individual preferences.

Thanks Steven, I was about to write something similar.

[]
> > In this if loop again i am catching name & rest of the things in $1.
> > $1 will be used for checking space between name & mail-id.
> BTW, people hate perl for this very reason. This subtle changing of $1
> is very hard to follow if you are not a perl expert. I use perl all the
> time (recordmcount.pl and ktest.pl), but if you look at my code, you
> will see that I purposely avoid these subtle characteristics of perl,
> because that's the (very rightfully so) reason people complain that perl
> is a write once and never maintain language.

I'm not a perl geek, nor do I want to be, but
that's exactly why I suggested after Anish's
first attempt something I think reasonably clear
and straightforward which avoids any reuse of $n.

Anish, please use this style.

	if ($line =~ /^(\s*)($ValidSignatures)(\s*)(.*)$/i) {
		my $space_before = $1;
		my $sign_off = $2;
		my $space_after = $3;
		my $email = $4;
		if (defined $space_before && $space_before ne "") {
			warning (no space before...)
		}
		if ($sign_off !~ /$Valid_Signature/) {
			warning (signature case...)
		}
		if (!defined $space_after || $space_after ne " ") {
			warning (need only one space after colon...)
		}
		if (!validate_email($email)) {
			warning (bad email...)
		}
	}

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