#!/usr/bin/env perl
# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements.  See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# The ASF licenses this file to You under the Apache License, Version 2.0
# (the "License"); you may not use this file except in compliance with
# the License.  You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

use strict;
use warnings;
use FindBin qw( $Bin );
use File::Find;

# make sure we are at the top-level dir
if ( !-d 'perl' and !-d 'core' ) {
    chdir("$Bin/../../");
}

my $usage = "$0 version\n";
my $version = shift(@ARGV) or die $usage;

# standardize version strings
my $x_y_z_version    = "";
my $x_yyyzzz_version = "";
if ( $version =~ m/^(\d+)\.(\d+)\.(\d+)$/ ) {
    $x_yyyzzz_version = sprintf( "%d.%03d%03d", $1, $2, $3 );
    $x_y_z_version = $version;
}
elsif ( $version =~ m/^(\d+)\.(\d\d\d)(\d\d\d)$/ ) {
    $x_y_z_version = sprintf( "%d.%d.%d", $1, $2, $3 );
    $x_yyyzzz_version = $version;
}
else {
    die "Unknown version syntax. Try X.Y.Z or X.YYYZZZ\n";
}

print "Using version: $x_y_z_version ( $x_yyyzzz_version )\n";

my $buf;

# Update Lucy.pm.
$buf = read_file('perl/lib/Lucy.pm');
$buf =~ s/(our \$VERSION\ +=\ +)'.+?'/$1'$x_yyyzzz_version'/g
    or die "no match";
$buf =~ s/XSLoader::load\( 'Lucy', '(.+?)'/XSLoader::load\( 'Lucy', '$x_y_z_version'/
    or die "no match";
write_file( 'perl/lib/Lucy.pm', $buf );

# Update Lucy.pod.
$buf = read_file('perl/lib/Lucy.pod');
$buf =~ s/(^=head1\s+VERSION\s+)([\d.]+)/$1$x_y_z_version/m
    or die "no match";
write_file( 'perl/lib/Lucy.pod', $buf );

# Update Build.PL
$buf = read_file('perl/Build.PL');
$buf =~ s/(dist_version\ +=>\ +)'.+?'/$1'$x_y_z_version'/
    or die "no match";
write_file( 'perl/Build.PL', $buf );

# Update all other Perl modules.
find sub {
    return unless /[.]pm$/;
    my $name = $_;
    return if $name eq 'Lucy.pm';
    my $buf = read_file($name);
    $buf =~ s/(our \$VERSION\ +=\ +)'.+?'/$1'$x_yyyzzz_version'/g
        or die "no match in $File::Find::name";
    write_file($name, $buf);
}, 'perl';

# utility functions
sub read_file {
    my ($file) = @_;
    local $/;
    open( F, "< $file" ) or die "Cannot read $file: $!\n";
    my $buf = <F>;
    close(F) or die "Cannot close $file: $!\n";
    return $buf;
}

sub write_file {
    my ( $file, $buf ) = @_;
    open( F, "> $file" ) or die "Cannot write $file: $!\n";
    print F $buf;
    close(F) or die "Cannot close $file: $!\n";
}

exit();

__END__

=head1 NAME

update_version - update Lucy version strings in source files

=head1 SYNOPSIS

 perl devel/bin/update_version version

=head1 DESCRIPTION

Updates key source files with I<version>, using correct syntax
depending on the file format and type.

I<version> may be specified in either format:

 X.Y.Z
 X.YYYZZZ

and update_version will convert the specified string into the 
correct format for each relevant file.

=cut