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Subject: Re: [PATCH v7] checkpatch: add fix option for LOGICAL_CONTINUATIONS
To:     joe@perches.com
Cc:     lukas.bulwahn@gmail.com, linux-kernel@vger.kernel.org,
        linux-kernel-mentees@lists.linuxfoundation.org
References: <afaa79a6d86a4184878595ced3f2de1a92a4058c.camel@perches.com>
 <20201123102818.24364-1-yashsri421@gmail.com>
From:   Aditya <yashsri421@gmail.com>
Message-ID: <a0f6479e-0c1b-a2f8-a265-32cc31313870@gmail.com>
Date:   Sun, 29 Nov 2020 14:25:09 +0530
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On 23/11/20 3:58 pm, Aditya Srivastava wrote:
> Currently, checkpatch warns if logical continuations are placed at the
> start of a line and not at the end of previous line.
> 
> E.g., running checkpatch on commit 3485507fc272 ("staging:
> bcm2835-camera: Reduce length of enum names") reports:
> 
> CHECK:LOGICAL_CONTINUATIONS: Logical continuations should be on the
> previous line
> +	if (!ret
> +	    && camera_port ==
> 
> Provide a simple fix by inserting logical operator at the last
> non-comment, non-whitespace char of the previous line and removing from
> current line, if both the lines are additions(ie start with '+')
> 
> Signed-off-by: Aditya Srivastava <yashsri421@gmail.com>
> ---
> changes in v2: quote $operator at substitution
> 
> changes in v3: add a check for previous line ending with comment;
> If so, insert $operator at the last non-comment, non-whitespace char of the previous line
> 
> changes in v4: improve the matching mechanism by matching line termination at comment or white space;
> insert the operator before comments (if any) separated by a whitespace;
> append the comment and its pre-whitespace after the inserted operator (if comment was present),
> ie if no comment was present nothing will be inserted after the operator
> 
> changes in v5: improve regex for comment and line end with '$;'
> 
> changes in v6: remove if-check; modify commit message
> 
> changes in v7: add an extra '$' symbol at '$fixed[$fixlinenr - 1]' regex substitution to ensure match at line end
> 
>  scripts/checkpatch.pl | 12 ++++++++++--
>  1 file changed, 10 insertions(+), 2 deletions(-)
> 
> diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
> index 5b1a5a65e69a..fb3c50e0bde2 100755
> --- a/scripts/checkpatch.pl
> +++ b/scripts/checkpatch.pl
> @@ -3553,8 +3553,16 @@ sub process {
>  
>  # check for && or || at the start of a line
>  		if ($rawline =~ /^\+\s*(&&|\|\|)/) {
> -			CHK("LOGICAL_CONTINUATIONS",
> -			    "Logical continuations should be on the previous line\n" . $hereprev);
> +			my $operator = $1;
> +			if (CHK("LOGICAL_CONTINUATIONS",
> +				"Logical continuations should be on the previous line\n" . $hereprev) &&
> +			    $fix && $prevrawline =~ /^\+/) {
> +				# insert logical operator at last non-comment, non-whitepsace char on previous line
> +				$prevline =~ /[\s$;]*$/;
> +				my $line_end = substr($prevrawline, $-[0]);
> +				$fixed[$fixlinenr - 1] =~ s/\Q$line_end\E$/ $operator$line_end/;
> +				$fixed[$fixlinenr] =~ s/\Q$operator\E\s*//;
> +			}
>  		}
>  
>  # check indentation starts on a tab stop
> 

Hi Joe
You probably missed this patch. Please review :)

Thanks
Aditya