/ 
ARGV-OrDATA-0.005
River stage zero No dependents
/ ARGV::OrDATA

NAME

ARGV::OrDATA - Let the diamond operator read from DATA if there's no ARGV

VERSION

Version 0.005

SYNOPSIS

use ARGV::OrDATA;

while (<>) {
    print;
}

__DATA__
You'll see this if you don't redirect something to the script's
STDIN or you don't specify a filename on the command line.

DESCRIPTION

Tell your script it should use the DATA section if there's no input coming from STDIN and there are no arguments.

You can also specify which package's DATA should be read instead of the caller's:

use My::Module;
use ARGV::OrDATA 'My::Module';

while (<>) {  # This reads from My/Module.pm's DATA section.
    print;
}

To restore the old behaviour, you can call the unimport method.

use ARGV::OrDATA;

my $from_data = <>;

@ARGV = 'file1.txt';  # Ignored.

'ARGV::OrDATA'->unimport;

@ARGV = 'file2.txt';  # Works.

my $from_file2 = <>;

Calling import after unimport would restore the DATA handle, but wouldn't rewind it, i.e. it would continue from where you stopped (see t/04-unimport.t).

Why?

I use this technique when solving programming contests. The sample input is usually small and I don't want to waste time by saving it into a file.

EXPORT

Nothing. There are 2 subroutines you can call via their fully qualified names, though:

ARGV::OrDATA::is_using_argv()

Returns 0 when ARGV reads from DATA, 0 otherwise.

ARGV::OrDATA::is_using_data()

Returns 1 when ARGV reads from DATA, 1 otherwise.

AUTHOR

E. Choroba, <choroba at cpan.org>

BUGS

Please report any bugs or feature requests to the GitHub repository at https://github.com/choroba/argv-ordata.

SUPPORT

You can find documentation for this module with the perldoc command.

perldoc ARGV::OrDATA

You can also look for information at:

ACKNOWLEDGEMENTS

LICENSE AND COPYRIGHT

Copyright 2017 E. Choroba.

This program is free software; you can redistribute it and/or modify it under the terms of the the Artistic License (2.0). You may obtain a copy of the full license at:

http://www.perlfoundation.org/artistic_license_2_0

Any use, modification, and distribution of the Standard or Modified Versions is governed by this Artistic License. By using, modifying or distributing the Package, you accept this license. Do not use, modify, or distribute the Package, if you do not accept this license.

If your Modified Version has been derived from a Modified Version made by someone other than you, you are nevertheless required to ensure that your Modified Version complies with the requirements of this license.

This license does not grant you the right to use any trademark, service mark, tradename, or logo of the Copyright Holder.

This license includes the non-exclusive, worldwide, free-of-charge patent license to make, have made, use, offer to sell, sell, import and otherwise transfer the Package with respect to any patent claims licensable by the Copyright Holder that are necessarily infringed by the Package. If you institute patent litigation (including a cross-claim or counterclaim) against any party alleging that the Package constitutes direct or contributory patent infringement, then this Artistic License to you shall terminate on the date that such litigation is filed.

Disclaimer of Warranty: THE PACKAGE IS PROVIDED BY THE COPYRIGHT HOLDER AND CONTRIBUTORS "AS IS' AND WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES. THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT ARE DISCLAIMED TO THE EXTENT PERMITTED BY YOUR LOCAL LAW. UNLESS REQUIRED BY LAW, NO COPYRIGHT HOLDER OR CONTRIBUTOR WILL BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING IN ANY WAY OUT OF THE USE OF THE PACKAGE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.