linux-kernel - Re: [PATCH] get_maintainer: Append parenthesis back to trimmed subsystem name

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Date:   Thu, 5 Aug 2021 14:44:42 +0800
From:   Kai-Heng Feng <kai.heng.feng@...onical.com>
To:     Joe Perches <joe@...ches.com>
Cc:     open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] get_maintainer: Append parenthesis back to trimmed
 subsystem name

On Thu, Aug 5, 2021 at 2:33 PM Joe Perches <joe@...ches.com> wrote:
>
> On Thu, 2021-08-05 at 14:17 +0800, Kai-Heng Feng wrote:
> > On Thu, Aug 5, 2021 at 12:22 AM Joe Perches <joe@...ches.com> wrote:
> > >
> > > On Thu, 2021-08-05 at 00:09 +0800, Kai-Heng Feng wrote:
> > > > When a closing parenthesis gets trimmed, there can be unmatched
> > > > parenthesis in the subsystem name. This doesn't play well with
> > > > git-send-email:
> > > > (cc-cmd) Adding cc: intel-gfx@...ts.freedesktop.org (open list:INTEL DRM DRIVERS (excluding Poulsbo, Moorestow...) from: 'scripts/get_maintainer.pl'
> > > > Unmatched () '(open list:INTEL DRM DRIVERS (excluding Poulsbo, Moorestow...)' '' at /usr/lib/git-core/git-send-email line 554.
> > > > error: unable to extract a valid address from: intel-gfx@...ts.freedesktop.org (open list:INTEL DRM DRIVERS (excluding Poulsbo, Moorestow...)
> > > >
> > > > So append parenthesis back if it was trimmed to make git-send-email
> > > > work again:
> > > > (cc-cmd) Adding cc: intel-gfx@...ts.freedesktop.org (open list:INTEL DRM DRIVERS (excluding Poulsbo, Mooresto...)) from: 'scripts/get_maintainer.pl'
> > >
> > > Probably better just to add --norolestats to the invoking command-line.
> >
> > This can solve the issue beautifully, thanks!
> >
> > >
> > > > diff --git a/scripts/get_maintainer.pl b/scripts/get_maintainer.pl
> > > []
> > > > @@ -1252,9 +1252,10 @@ sub get_subsystem_name {
> > > >
> > > >
> > > >      my $subsystem = $typevalue[$start];
> > > >      if ($output_section_maxlen && length($subsystem) > $output_section_maxlen) {
> > > > -     $subsystem = substr($subsystem, 0, $output_section_maxlen - 3);
> > > > +     my $parenthesis = substr($subsystem, -1) eq ")";
> > > > +     $subsystem = substr($subsystem, 0, $output_section_maxlen - ($parenthesis ? 4 : 3));
> > > >       $subsystem =~ s/\s*$//;
> > > > -     $subsystem = $subsystem . "...";
> > > > +     $subsystem = $subsystem . "..." . ($parenthesis ? ")" : "");
> > >
> > > Given an $output_section_maxlen number of possible parentheses, this should
> > > probably use a while...
> >
> > Or maybe count the parentheses in two runs?
> >
> > diff --git a/scripts/get_maintainer.pl b/scripts/get_maintainer.pl
> > index 2075db0c08b8e..08315074acffa 100755
> > --- a/scripts/get_maintainer.pl
> > +++ b/scripts/get_maintainer.pl
> > @@ -1252,9 +1252,21 @@ sub get_subsystem_name {
> >
> >      my $subsystem = $typevalue[$start];
> >      if ($output_section_maxlen && length($subsystem) >
> > $output_section_maxlen) {
> > +       my $need_closing = 0;
> >         $subsystem = substr($subsystem, 0, $output_section_maxlen - 3);
> >         $subsystem =~ s/\s*$//;
> > -       $subsystem = $subsystem . "...";
> > +
> > +       if (substr($subsystem, -1) eq "(") {
> > +           $subsystem = substr($subsystem, 0, -2);
> > +       } else {
> > +           my $opening = () = $subsystem =~ /\(/g;
> > +           my $closing = () = $subsystem =~ /\)/g;
> > +           if ($opening != $closing) {
> > +               $need_closing = 1;
> > +           }
> > +       }
> > +
> > +       $subsystem = $subsystem . "..." . ($need_closing ? ")" : "");
>
> This wouldn't necessarily work as you need to have balanced parentheses...
>
> It could be something like:
>
>         my $open_parens = () = $subsystem =~ /\(/g;
>         my $close_parens = () = $subsystem =~ /\)/g;
>         $subsystem .= ')' x ($open_parens - $close_parens);

OK, let me think how do it without exceeding $output_section_maxlen.

Kai-Heng

>
>