#!/usr/bin/env perl
# BEGIN BPS TAGGED BLOCK {{{
#
# COPYRIGHT:
#
# This software is Copyright (c) 1996-2018 Best Practical Solutions, LLC
#                                          <sales@bestpractical.com>
#
# (Except where explicitly superseded by other copyright notices)
#
#
# LICENSE:
#
# This work is made available to you under the terms of Version 2 of
# the GNU General Public License. A copy of that license should have
# been provided with this software, but in any event can be snarfed
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# This work is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
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# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
# 02110-1301 or visit their web page on the internet at
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# CONTRIBUTION SUBMISSION POLICY:
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# END BPS TAGGED BLOCK }}}
use strict;
use warnings;

use File::Copy;

die "Usage: $0 'pattern to match msgid' 'code that changes \$_ for the msgstr' [files]" if @ARGV < 2;

my $msgid_pattern = shift;
my $msgid_regex   = qr#$msgid_pattern#o;

my $code_str  = shift;

@ARGV = (
    <share/po/*.po>,
    <share/po/*.pot>,
    <po/*.po>,
    <po/*.pot>
) unless @ARGV;

my @files = @ARGV;

for my $file (@files) {
    my ($src, $dest) = ($file, "$file.new");
    open(my $fh_in, '<', $src) or die $!;
    open(my $fh_out, '>', $dest) or die $!;
    my $mark_to_change = 0;
    while (<$fh_in>) {
        if (/^msgid\s+"(.+?)"$/ and $1 =~ $msgid_regex) {
            # we're at the msgid in question
            $mark_to_change = 1;
        }
        elsif ($mark_to_change) {
            # we're at the line after the msgid in question
            eval $code_str;
            $mark_to_change = 0;
        }
        print $fh_out $_;
    }
    close $_ for $fh_in, $fh_out;

    # copy back to source
    move($dest => $src);
}