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SubjectRe: [PATCH v3] checkpatch: add fix option for LOGICAL_CONTINUATIONS
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On Sat, 2020-11-21 at 23:43 +0530, 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 adding logical operator at the end of 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 $operator at the last non-comment, non-whitespace char of the previous line
[]
> diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
[]
> @@ -3553,8 +3553,22 @@ sub process {
>  
>
>  # check for && or || at the start of a line
>   if ($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 && $prevrawline =~ /^\+/) {
> + # add logical operator to the previous line, remove from current line
> + # if last line ends with a comment
> + if ($prevrawline =~ /(\/\/.*)$/) {

Not the best mechanism.

check $prevline =~ /[\s$;]*$/ and use the starting position of any
match as the insertion point, and then insert the operator and
matching bits from the $prevrawline.

I'll leave that as an exercise for you for now.

> + my $comment = trim($1);
> + $fixed[$fixlinenr - 1] =~ s/\s*$comment//;
> + $fixed[$fixlinenr - 1] .= " $operator $comment";


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