linux-kernel - Re: [PATCH v4] checkpatch: allow long lines containing URL

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Date:   Wed, 22 Nov 2017 08:12:52 -0800
From:   Joe Perches <joe@...ches.com>
To:     Andreas Brauchli <a.brauchli@...mentarea.net>,
        Andy Whitcroft <apw@...onical.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4] checkpatch: allow long lines containing URL

On Wed, 2017-11-22 at 13:57 +0100, Andreas Brauchli wrote:
> Allow lines with URL to exceed the 80 char limit for improved
> interaction in adaption to ongoing but undocumented practice.

Acked-by: Joe Perches <joe@...ches.com>

> $ git grep -E '://\S{77}.*' -- '*.[ch]'
> 
> As per RFC3986 [1], the URL format allows for alphanum, +, - and .
> characters in the scheme before the separator :// as long as it starts
> with a letter (e.g. https, git, f.-+).
> 
> Recognition of URIs without more context information is prone to false
> positives and thus currently left out of the heuristics.
> 
> $rawline is used in the check as comments are removed from $line.
> 
> [1] https://tools.ietf.org/html/rfc3986#section-3.1
> 
> Signed-off-by: Andreas Brauchli <andreas.brauchli@...sirion.com>
> ---
>  scripts/checkpatch.pl | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
> index 95cda3ecc66b..8e4c4ee9811a 100755
> --- a/scripts/checkpatch.pl
> +++ b/scripts/checkpatch.pl
> @@ -2875,6 +2875,7 @@ sub process {
>  #	logging functions like pr_info that end in a string
>  #	lines with a single string
>  #	#defines that are a single string
> +#	lines with an RFC3986 like URL
>  #
>  # There are 3 different line length message types:
>  # LONG_LINE_COMMENT	a comment starts before but extends beyond $max_line_length
> @@ -2906,6 +2907,10 @@ sub process {
>  				 $line =~ /^\+\s*(?:\w+)?\s*DEFINE_PER_CPU/) {
>  				$msg_type = "";
>  
> +			# URL ($rawline is used in case the URL is in a comment)
> +			} elsif ($rawline =~ /^\+.*\b[a-z][\w\.\+\-]*:\/\/\S+/i) {
> +				$msg_type = "";
> +
>  			# Otherwise set the alternate message types
>  
>  			# a comment starts before $max_line_length