Re: [Linux-kernel-mentees] [PATCH v5] checkpatch: add new exception to repeated word check

[Dwaipayan Ray <dwaipayanray1@gmail.com>]

On Sun, Oct 18, 2020 at 11:50 AM Joe Perches <joe@perches.com> wrote:
>
> On Sat, 2020-10-17 at 22:19 +0530, Dwaipayan Ray wrote:
> > On Sat, Oct 17, 2020 at 10:03 PM Joe Perches <joe@perches.com> wrote:
> > > On Sat, 2020-10-17 at 21:57 +0530, Dwaipayan Ray wrote:
> > > > Recently, commit 4f6ad8aa1eac ("checkpatch: move repeated word test")
> > > > moved the repeated word test to check for more file types. But after
> > > > this, if checkpatch.pl is run on MAINTAINERS, it generates several
> > > > new warnings of the type:
> > >
> > > NAK.
> > >
> > > Slow down and test before you send more patch versions.
> > >
> > > > +                             next if (index(" \t.,;?!", $end_char) == -1);
> > >
> > > what does this do?
> >
> > Um, it checks if end_char is not present in " \t.,;?!".
> > If end_char doesn't belong to this list, then the check shall
> > skip. That is the test will skip for "word word:", but will produce
> > a warning for "word word." or "word word?", etc.
> >
> > Shouldn't this itself be the case or am I perhaps going wrong
> > somewhere?
>
> No, you were right, I was being a numbskull.
>
> btw: I think this should set
>         my $end_char = ' ';
> not ''
>
> so that if the last word on a line is a
> repeat the test still works.
>
Hi,
Umm, index() function seems to return 0 when an empty string is
passed. I tried this:

print index(" \t.,;?!", '');

It output 0 in my case. So last words on a line seems to work.
I don't know if this changes with the perl version though.

So given this, will it be necessary to change end_char to ' ' ?
or perhaps change both start_char and end_char to a ' ' to maintain
uniformity?

Thanks,
Dwaipayan.
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