#!/usr/bin/perl -w
#
#  This script was developed by Robin Barker (Robin.Barker@npl.co.uk),
#  from Larry Wall's original script eg/rename from the perl source.
#
#  This script is free software; you can redistribute it and/or modify
+ it
#  under the same terms as Perl itself.
#
# Larry(?)'s RCS header:
#  RCSfile: rename,v   Revision: 4.1   Date: 92/08/07 17:20:30 
#
# $RCSfile: rename,v $$Revision: 1.5 $$Date: 1998/12/18 16:16:31 $
#
# $Log: rename,v $
# Revision 1.5  1998/12/18 16:16:31  rmb1
# moved to perl/source
# changed man documentation to POD
#
# Revision 1.4  1997/02/27  17:19:26  rmb1
# corrected usage string
#
# Revision 1.3  1997/02/27  16:39:07  rmb1
# added -v
#
# Revision 1.2  1997/02/27  16:15:40  rmb1
# *** empty log message ***
#
# Revision 1.1  1997/02/27  15:48:51  rmb1
# Initial revision
#

use strict;

use Getopt::Long;
Getopt::Long::Configure('bundling');

my ($verbose, $no_act, $force, $op);

die "Usage: rename [-v] [-n] [-f] perlexpr [filenames]\n"
    unless GetOptions(
    'v|verbose' => \$verbose,
    'n|no-act'  => \$no_act,
    'f|force'   => \$force,
    ) and $op = shift;

$verbose++ if $no_act;

if (!@ARGV) {
    print "reading filenames from STDIN\n" if $verbose;
    @ARGV = <STDIN>;
    chop(@ARGV);
}

for (@ARGV) {
    my $was = $_;
    eval $op;
    die $@ if $@;
    next if $was eq $_; # ignore quietly
    if (-e $_ and !$force)
    {
    warn  "$was not renamed: $_ already exists\n";
    }
    elsif ($no_act or rename $was, $_)
    {
    print "$was renamed as $_\n" if $verbose;
    }
    else
    {
    warn  "Can't rename $was $_: $!\n";
    }
}

__END__
=head1 NAME
rename - renames multiple files
=head1 SYNOPSIS
B<rename> S<[ B<-v> ]> S<[ B<-n> ]> S<[ B<-f> ]> I<perlexpr> S<[ I<fil
+es> ]>
=head1 DESCRIPTION
C<rename>
renames the filenames supplied according to the rule specified as the
first argument.
The I<perlexpr> 
argument is a Perl expression which is expected to modify the C<$_>
string in Perl for at least some of the filenames specified.
If a given filename is not modified by the expression, it will not be
renamed.
If no filenames are given on the command line, filenames will be read
via standard input.
For example, to rename all files matching C<*.bak> to strip the extens
+ion,
you might say
    rename 's/\.bak$//' *.bak
To translate uppercase names to lower, you'd use
    rename 'y/A-Z/a-z/' *
=head1 OPTIONS
=over 8
=item B<-v>, B<--verbose>
Verbose: print names of files successfully renamed.
=item B<-n>, B<--no-act>
No Action: show what files would have been renamed.
=item B<-f>, B<--force>
Force: overwrite existing files.
=back
=head1 ENVIRONMENT
No environment variables are used.
=head1 AUTHOR
Larry Wall
=head1 SEE ALSO
mv(1), perl(1)
=head1 DIAGNOSTICS
If you give an invalid Perl expression you'll get a syntax error.
=head1 BUGS
The original C<rename> did not check for the existence of target filen
+ames,
so had to be used with care.  I hope I've fixed that (Robin Barker).
=cut
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