linux-kernel - Re: [PATCH] checkpatch: use patch subject when reading from stdin

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Date:   Tue, 08 Oct 2019 05:50:37 -0700
From:   Joe Perches <joe@...ches.com>
To:     Geert Uytterhoeven <geert+renesas@...der.be>,
        Andy Whitcroft <apw@...onical.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     linux-kernel@...r.kernel.org
Subject: Re: [PATCH] checkpatch: use patch subject when reading from stdin

On Tue, 2019-10-08 at 11:40 +0200, Geert Uytterhoeven wrote:
> When reading a patch file from standard input, checkpatch calls it "Your
> patch", and reports its state as:
> 
>     Your patch has style problems, please review.
> 
> or:
> 
>     Your patch has no obvious style problems and is ready for submission.
> 
> Hence when checking multiple patches by piping them to checkpatch, e.g.
> when checking patchwork bundles using:
> 
>     formail -s scripts/checkpatch.pl < bundle-foo.mbox
> 
> it is difficult to identify which patches need to be reviewed and
> improved.
> 
> Fix this by replacing "Your patch" by the patch subject, if present.

Seems sensible, thanks Geert

> Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
> ---
>  scripts/checkpatch.pl | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
> index 6fcc66afb0880830..6b9feb4d646a116b 100755
> --- a/scripts/checkpatch.pl
> +++ b/scripts/checkpatch.pl
> @@ -1047,6 +1047,10 @@ for my $filename (@ARGV) {
>  	}
>  	while (<$FILE>) {
>  		chomp;
> +		if ($vname eq 'Your patch') {
> +			my ($subject) = $_ =~ /^Subject:\s*(.*)/;
> +			$vname = '"' . $subject . '"' if $subject;

trivia:

Not a big deal and is likely good enough but this will
cut off subjects that are continued on multiple lines.

e.g.:

Subject: [PATCH Vx n/M] very long description with a subject spanning
 multiple lines
From: patch submitter <submitter@...ain.tld>

> +		}
>  		push(@rawlines, $_);
>  	}
>  	close($FILE);