#!/usr/bin/perl -wT

#
# $Id: rev,v 1.2 2004/08/05 14:17:44 cwest Exp $
#
# $Log: rev,v $
# Revision 1.2  2004/08/05 14:17:44  cwest
# cleanup, new version number on website
#
# Revision 1.1  2004/07/23 20:10:15  cwest
# initial import
#
# Revision 1.0 1999/03/03 andy murren
# Inital Revision
#

# packages used in this program
use FileHandle;
use strict;
use Carp;

# unbuffer output to make it look speedier
$|++;  

# version information set up for use with RCS/CVS
my $VERSION = do { my @r = (q$Revision: 1.2 $ =~ /\d+/g); sprintf
"%d."."%02d" x $#r, @r }; 

# set up some variables
my $debug = 0;  # 0 for no anything else to debug
my $file = 0;

if ($ARGV[0] eq '--version') {
	print " $0 $VERSION\n";
}
elsif (($ARGV[0] eq '--help') || ($ARGV[0] eq '?') || ($ARGV[0] eq '-h')) {
	print <<EOF;

Usage: $0 [OPTION] [FILE]

Reverses lines of the named file or the text input on SDTIN

Options:
	--version:  Print version number, then exit.
	--help || -h || ? :     Print usage, then exit;

EOF
}
elsif (-f $ARGV[0]) {

	if ($debug) {print "\n\nthis is a file\n\n";}
	my $fh = new FileHandle "< $ARGV[0]";  # here is the file handle

	# in case the file handle does not open
    unless (defined ($fh)) {
		croak "did not open file $ARGV[0] $!\n";  
	}

	# iterate over the file and put each line into an
	# array of charaters and print them out in reverse order.
	while (<$fh>) {
		my @a = split(//, $_);
		print reverse @a;
	}
	print "\n";  
	$fh->close;  # close the file handle
}
else {
	if ($debug) {print "\n\nthis is not a file\n\n";}

	# here we start at the end of the array and work to
	# the start.
	my $len = @ARGV;
	for (my $cnt = ($len - 1); $cnt >= 0; $cnt-- ) {
		my @b = split(//, $ARGV[$cnt]);
		print reverse @b;
		
		# since each white space is denotes the next arg
		# we have to put spaces back in.  $cnt is checked to 
		# see if we have reached the end yet.  If there are
		# no more args we do not want to append an extra space
		# that was not on the input.

		if ($cnt) {print ' ';}
	}
	print "\n";  
}

exit 1;

__END__

=pod

=head1 NAME

rev - reverse lines of a file

=head1 SYNOPSIS

rev [options] [file]

=head1 DESCRIPTION

The rev utility copies the specified files to the standard output, 
reversing the order of characters in every line.  If no files are 
specified, the standard input is read.

=head2 OPTIONS

I<rev> accepts the following options:

=over 4

=item  --help || -h || ? 

Print a short help message, then exits.

=item  --version

Prints out its version number, then exits.

=head1 BUGS

I<rev> has no known bugs.

=head1 REVISION HISTORY

	$Log: rev,v $
	Revision 1.2  2004/08/05 14:17:44  cwest
	cleanup, new version number on website
	
	Revision 1.1  2004/07/23 20:10:15  cwest
	initial import
	
	Revision 1.0 1999/03/03 andy murren
	Inital Revision

=head1 AUTHOR

This Perl implmentation of I<rev> was written by Andy Murren,
I<andy@murren.org>.

=head1 COPYRIGHT and LICENSE

This program is covered by the GNU Public License (GPL).
See I<http://www.gnu.org/copyleft/gpl.html> for complete detail of the license.

=cut

Andy Murren
andy@murren.com
973-714-3398 (cell)