#! /usr/bin/perl
#---------------------------------------------------------------------
# awp2txt
# Copyright 1996 Christopher J. Madsen
#
# This program is free software; you can redistribute it and/or modify
# it under the same terms as Perl itself.
#
# 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 either the
# GNU General Public License or the Artistic License for more details.
#
# ABSTRACT: Convert AppleWorks word processor files to text files
#---------------------------------------------------------------------

our $VERSION = '0.200';
# This file is part of AppleII-LibA2 0.200 (August 1, 2015)

foreach $filename (@ARGV) {
    die "$filename: not a normal file" unless -f $filename;
    if (-e "$filename.txt") {
        print STDERR "$filename.txt already exists, skipping it...\n";
        next;
    }

    open(IN,"<$filename") or die "Can't open `$filename'";
    binmode IN;

    my $header = '';
    read(IN,$header,300) == 300 or die "$filename: unexpected end-of-file";

    if (substr($header,4,1) ne "\x4F") {
        print STDERR "$filename is not an AppleWorks word processor file\n";
        next;
    }

    open(OUT,">$filename.txt") or die "Can't write `$filename.txt'";

    print STDERR "Converting $filename to $filename.txt...\n";

    if (substr($header,183,1) ne "\0") {
        #print STDERR "AppleWorks 3.0 or later\n";
        seek(IN,2,1);           # Skip over invalid line record (two bytes)
    }

    my $line = 0;

    while (1) {
        my $record = '';
        read(IN,$record,2) == 2 or die "$filename: unexpected end-of-file";
        my ($byte0, $byte1) = unpack('C2',$record);
        if ($byte1 == 0xD0) {
            ++$line;
            print OUT "\n";     # CR record
        } elsif ($byte1 > 0xD0) {
            last if $record eq "\xFF\xFF";
            next;               # Command record
        } elsif ($byte1 == 0) {
            # Text record
            ++$line;
            my ($data,$byte2,$byte3) = '';
            read(IN,$data,$byte1*0x100 + $byte0) or die"$filename: read error";
            ($byte2,$byte3,$data) = unpack('C2A*',$data);
            next if $byte2 == 0xFF; # Tab ruler
            # Untabify & delete special codes:
            $data =~ tr/\x16\x17\x01-\x1F/  /d;
            print OUT ' ' x ($byte2 & 0x7F), $data, "\n";
        } else {
            die sprintf("%s: unknown record type %02X%02X after line %d",
                        $filename, $byte0, $byte1, $line);
        }
    } # end forever

    close IN;
    close OUT;
} # end foreach $filename

__END__

=head1 NAME

awp2txt - Convert AppleWorks word processor files to text files

=head1 VERSION

This document describes version 0.200 of
awp2txt, released August 1, 2015
as part of AppleII-LibA2 version 0.200.

=head1 SYNOPSIS

  awp2txt FILE [FILE ...]

=head1 DESCRIPTION

B<awp2txt> converts AppleWorks word processor files to plain text
files.  For each FILE specified on the command line, it writes the
contents to FILE.txt.  The original files are not changed.  If
FILE.txt already exists, it is I<not> overwritten.

=head1 CONFIGURATION AND ENVIRONMENT

awp2txt requires no configuration files or environment variables.

=head1 DEPENDENCIES

awp2txt is a stand-alone utility.

=head1 INCOMPATIBILITIES

None reported.

=head1 BUGS AND LIMITATIONS

No bugs have been reported.

=head1 AUTHOR

Christopher J. Madsen  S<C<< <perl AT cjmweb.net> >>>

Please report any bugs or feature requests
to S<C<< <bug-AppleII-LibA2 AT rt.cpan.org> >>>
or through the web interface at
L<< http://rt.cpan.org/Public/Bug/Report.html?Queue=AppleII-LibA2 >>.

You can follow or contribute to AppleII-LibA2's development at
L<< https://github.com/madsen/perl-libA2 >>.

=head1 COPYRIGHT AND LICENSE

This software is copyright (c) 2015 by Christopher J. Madsen.

This is free software; you can redistribute it and/or modify it under
the same terms as the Perl 5 programming language system itself.

=head1 DISCLAIMER OF WARRANTY

BECAUSE THIS SOFTWARE IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
FOR THE SOFTWARE, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN
OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
PROVIDE THE SOFTWARE "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER
EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE
ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE SOFTWARE IS WITH
YOU. SHOULD THE SOFTWARE PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL
NECESSARY SERVICING, REPAIR, OR CORRECTION.

IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
REDISTRIBUTE THE SOFTWARE AS PERMITTED BY THE ABOVE LICENSE, BE
LIABLE TO YOU FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL,
OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE
THE SOFTWARE (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING
RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A
FAILURE OF THE SOFTWARE TO OPERATE WITH ANY OTHER SOFTWARE), EVEN IF
SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
SUCH DAMAGES.

=cut
