#!/usr/bin/perl -0777 -pi

# In configure.ac, update PACKAGE_COPYRIGHT_YEAR to the current year.

# Copyright (C) 2010-2015, 2018-2022 Free Software Foundation, Inc.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3, or (at your option)
# any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <https://www.gnu.org/licenses/>.

use strict;
use warnings;

my $this_year = $ENV{UPDATE_COPYRIGHT_YEAR};
if (!$this_year || $this_year !~ m/^\d{4}$/)
  {
    my ($sec, $min, $hour, $mday, $month, $year) = localtime (time ());
    $this_year = $year + 1900;
  }
my $old_re = <<'EOF'
  (
    MACRO\(
    \[PACKAGE_COPYRIGHT_YEAR],
    \s*\[
  )
  (\d{4})
  (?=])
EOF
  ;
foreach my $macro ("AC_DEFINE", "AC_SUBST")
  {
    my $this_old_re = $old_re;
    $this_old_re =~ s/MACRO/$macro/;
    if (!s/$this_old_re/$1$this_year/x)
      {
        print STDERR
          "$ARGV: warning: failed to update PACKAGE_COPYRIGHT_YEAR in"
          . " $macro.\n";
      }
  }