#!/usr/local/bin/perl -w

#
# $Id: demorse,v 1.1.1.1 2001/06/06 08:54:51 sdague Exp $
#
# $Log: demorse,v $
# Revision 1.1.1.1  2001/06/06 08:54:51  sdague
# initial import
#
# Revision 1.1  2001/05/14 00:49:39  sdague
# added more files
#
# Revision 1.1  1999/03/06 03:58:58  abigail
# Initial revision
#
#

use strict;

my ($VERSION) = '$Revision: 1.1.1.1 $' =~ /([.\d]+)/;

my $warnings = 0;

END {
    close STDOUT || die "can't close stdout: $!\n";
    $? = 1 if $? == 255;  # from die
}

# Print a usuage message on a unknown option.
# Requires my patch to Getopt::Std of 25 Feb 1999.
$SIG {__WARN__} = sub {
    if (substr ($_ [0], 0, 14) eq "Unknown option") {die "Usage"};
    require File::Basename;
    $0 = File::Basename::basename ($0);
    $warnings = 1;
    warn "$0: @_";
};

$SIG {__DIE__} = sub {
    require File::Basename;
    $0 = File::Basename::basename ($0);
    if (substr ($_ [0], 0,  5) eq "Usage") {
        die <<EOF;
$0 (Perl game utils) $VERSION
$0 [files ...]
EOF
    }
    die "$0: @_";
};

if (@ARGV && $ARGV [0] =~ /^-(?=.)/ && ! -f $ARGV [0]) {
    die "Usage";
}

my %translations = reverse (
     0   => '-----',   1   => '.----',   2   => '..---',   3   => '...--',
     4   => '....-',   5   => '.....',   6   => '-....',   7   => '--...',
     8   => '---..',   9   => '----.',   a   => '.-',      b   => '-...',
     c   => '-.-.',    d   => '-..',     e   => '.',       f   => '..-.',
     g   => '--.',     h   => '....',    i   => '..',      j   => '.---',
     k   => '-.-',     l   => '.-..',    m   => '--',      n   => '-.',
     o   => '---',     p   => '.--.',    q   => '--.-',    r   => '.-.',
     s   => '...',     t   => '-',       u   => '..-',     v   => '...-',
     w   => '.--',     x   => '-..-',    y   => '-.--',    z   => '--..',

    # These aren't in the BSD source code...
    '.'  => '.-.-.-', ','  => '--..--', ':'  => '---...', '?'  => '..--..',
    "'"  => '.----.', '-'  => '-....-', '/'  => '-..-.',  '('  => '-.--.-',
    ')'  => '-.--.-', '"'  => '.-..-.', ' '  => '-...-'
);

unshift @ARGV => "-" unless @ARGV;

foreach my $file (@ARGV) {
    local *FILE;
    open FILE, $file or die "$file: $!\n";
    while (<FILE>) {
        my $line;
        s/^\s+//;                       # Leading space.
        s/dit ?/./g; s/daw ?/-/g;       # Long to short.
        while (/,\n/ && defined ($line = <FILE>)) {
            $line =~ s/^\s+//;          # Leading space.
            $line =~ s/dit ?/./g;       # Long to short.
            $line =~ s/daw ?/-/g;       # Long to short.
            s/,\n/ $line/;              # Combine lines.
        }
        my $comma = s/,$//;             # Trailing comma.
        s/([-.]+) ?/exists $translations{$1} ?
                           $translations{$1} : die "$1: unknown token"/ge;
        print;
        last if $comma;
    }
    close FILE or die "$file: $!\n";
}
    
exit $warnings;

__END__

=pod

=head1 NAME

demorse -- read morse and translate it to text

=head1 SYNOPSIS

demorse [files ...]

=head1 DESCRIPTION

I<demorse> reads morse from files, (or from standard input if no files
are given), and translates it back to text. Morse can be given in either
short (-- --- .-. ... .) or long form (daw daw, daw daw daw, dit daw dit,
dit dit dit). In the short form, letters are separated by spaces, and
words by 2 spaces (or the morse symbol for space). In the long form,
letters are separated by 2 spaces, and words by 3. As a special features,
I<demorse> parses the output of I<morse(6)>, which writes each letter
on a comma terminated line.

Short and long form can be mixed, as well as I<morse(6)> format and
space separated letters.

Any characters that can't be interpreted as part of the morse 
sequence is copied untouched. The program will die when encountering
a series of dots and dashes that it cannot translate.

=head1 ENVIRONMENT

The working of I<morse> is not influenced by any environment variables.

=head1 BUGS

I<morse> will report an unknown sequence of dots and dashes in short
form, even if the input was given in dits and daws.

=head1 REVISION HISTORY

    $Log: demorse,v $
    Revision 1.1.1.1  2001/06/06 08:54:51  sdague
    initial import

    Revision 1.1  2001/05/14 00:49:39  sdague
    added more files

    Revision 1.1  1999/03/06 03:58:58  abigail
    Initial revision

=head1 AUTHOR

The Perl implementation of I<demorse> was written by Abigail,
I<abigail@fnx.com>.

=head1 COPYRIGHT and LICENSE

This program is copyright by Abigail 1999.

This program is free and open software. You may use, copy, modify, distribute
and sell this program (and any modified variants) in any way you wish,
provided you do not restrict others to do the same.

=cut