#!/usr/bin/perl
# --
# scripts/tools/charset-convert.pl - converts a text file from one to an other one charset
# Copyright (C) 2001-2015 OTRS AG, http://otrs.com/
# --
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU AFFERO General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# 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 Affero General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
# or see http://www.gnu.org/licenses/agpl.txt.
# --

use strict;
use warnings;

use Encode;
use Getopt::Std;

my %Opts = ();
getopt( 'sdf', \%Opts );

# usage
if ( $Opts{h} ) {
    print "charset-convert.pl - convert a charset of a file\n";
    print "Copyright (C) 2001-2015 OTRS AG, http://otrs.com/\n";
    print "usage: charset-convert.pl -s <SOURCE_CHARSET> -d <DEST_CHARSET> -f <FILE>\n";
    print "       charset-convert.pl -s <SOURCE_CHARSET> -d <DEST_CHARSET> < file\n";
    exit 1;
}

# get charsts
if ( !$Opts{s} ) {
    print STDERR "ERROR: Need -s <SOURCE_CHARSET>\n";
    exit 1;
}
if ( !$Opts{d} ) {
    print STDERR "ERROR: Need -d <DEST_CHARSET>\n";
    exit 1;
}

# check stdin
my $In  = '';
my @STD = ();

if ( !$Opts{f} ) {
    @STD = <STDIN>;
    for (@STD) {
        $In .= $_;
    }
}

# check file
elsif ( !-f $Opts{f} ) {
    print STDERR "ERROR: Invalid -f <FILE>: no such file!\n";
    exit 1;
}

# read file
else {
    open my $IN, '<', $Opts{f} || die "Can't open $Opts{f}: $!\n";    ## no critic
    $In = do { local $/; <$IN> };
    close $IN;
}

# convert
Encode::from_to( $In, $Opts{s}, $Opts{d} );

# print
if (@STD) {
    print $In;
}

# write
else {
    open my $Out, '>', $Opts{f} || die "Can't write $Opts{f}: $!\n";    ## no critic
    print $Out $In;
    close $Out;
}
