ARGV-OrDATA
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Revision history for ARGV-OrDATA
0.006 2025-12-08
Fix the documentation.
0.005 2024-11-27
New subroutines: is_using_data and is_using_argv.
0.004 2019-01-05
Use IO::Pty if available instead of skipping tests.
Changes
lib/ARGV/OrDATA.pm
Makefile.PL
MANIFEST This list of files
README
t/00-data.t
t/01-file.t
t/02-stdin.t
t/03-package.t
t/04-unimport.t
t/05-is_funcs.t
t/input.txt
{
"abstract" : "Let the diamond operator read from DATA if there's no ARGV",
"author" : [
"E. Choroba <choroba@cpan.org>"
],
"dynamic_config" : 1,
"generated_by" : "ExtUtils::MakeMaker version 7.70, CPAN::Meta::Converter version 2.150010",
"license" : [
"artistic_2"
],
"meta-spec" : {
"url" : "http://search.cpan.org/perldoc?CPAN::Meta::Spec",
"version" : "2"
},
"name" : "ARGV-OrDATA",
"no_index" : {
"directory" : [
"t",
"inc"
]
},
"prereqs" : {
"build" : {
"requires" : {
"FindBin" : "0",
---
abstract: "Let the diamond operator read from DATA if there's no ARGV"
author:
- 'E. Choroba <choroba@cpan.org>'
build_requires:
FindBin: '0'
Test::More: '0'
configure_requires:
ExtUtils::MakeMaker: '0'
dynamic_config: 1
generated_by: 'ExtUtils::MakeMaker version 7.70, CPAN::Meta::Converter version 2.150010'
license: artistic_2
meta-spec:
url: http://module-build.sourceforge.net/META-spec-v1.4.html
version: '1.4'
name: ARGV-OrDATA
no_index:
directory:
- t
- inc
requires:
perl: '5.008'
resources:
repository: https://github.com/choroba/argv-ordata
version: '0.006'
x_serialization_backend: 'CPAN::Meta::YAML version 0.018'
Makefile.PL view on Meta::CPAN
use 5.006;
use strict;
use warnings;
use ExtUtils::MakeMaker;
WriteMakefile(
NAME => 'ARGV::OrDATA',
AUTHOR => q{E. Choroba <choroba@cpan.org>},
VERSION_FROM => 'lib/ARGV/OrDATA.pm',
ABSTRACT_FROM => 'lib/ARGV/OrDATA.pm',
LICENSE => 'artistic_2',
PL_FILES => {},
MIN_PERL_VERSION => '5.008',
CONFIGURE_REQUIRES => {
'ExtUtils::MakeMaker' => '0',
},
BUILD_REQUIRES => {
'FindBin' => '0',
'Test::More' => '0',
},
PREREQ_PM => {
#'ABC' => '1.6',
#'Foo::Bar::Module' => '5.0401',
},
macro => { TARFLAGS => '--format=ustar -cvf' },
dist => { COMPRESS => 'gzip -9f', SUFFIX => 'gz', },
clean => { FILES => 'ARGV-OrDATA-*' },
META_MERGE => {
resources => { repository => 'https://github.com/choroba/argv-ordata' },
},
);
ARGV-OrDATA
ARGV::OrDATA - Let the diamond operator read from DATA if there's no ARGV
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.
INSTALLATION
To install this module, run the following commands:
perl Makefile.PL
make
make test
make install
SUPPORT AND DOCUMENTATION
After installing, you can find documentation for this module with the
perldoc command.
perldoc ARGV::OrDATA
You can also look for information at:
MetaCPAN
https://metacpan.org/pod/ARGV::OrDATA
GitHub, the distribution's git repository (inludes issues)
http://github.com/choroba/argv-ordata
LICENSE AND COPYRIGHT
Copyright (C) 2017 E. Choroba
This program is free software; you can redistribute it and/or modify it
lib/ARGV/OrDATA.pm view on Meta::CPAN
package ARGV::OrDATA;
use 5.006;
use strict;
use warnings;
=head1 NAME
ARGV::OrDATA - Let the diamond operator read from DATA if there's no ARGV
=head1 VERSION
Version 0.006
=cut
our $VERSION = '0.006';
sub import {
my ($package) = $_[1] || caller;
{ no strict 'refs';
no warnings 'once';
*ORIG = *ARGV;
*ARGV = *{$package . '::DATA'} unless @ARGV || ! -t;
}
}
sub unimport {
my $package = shift;
*ARGV = *ORIG;
{ no strict 'refs';
delete ${$package . '::'}{ORIG};
}
lib/ARGV/OrDATA.pm view on Meta::CPAN
}
sub is_using_argv {
! is_using_data()
}
sub is_using_data {
my ($package) = caller;
$package = caller 1 if 'ARGV::OrDATA' eq $package;
return do {
no strict 'refs';
*ARGV eq *{$package . '::DATA' }
}
}
=head1 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.
=head1 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 C<unimport> method.
use ARGV::OrDATA;
my $from_data = <>;
@ARGV = 'file1.txt'; # Ignored.
'ARGV::OrDATA'->unimport;
@ARGV = 'file2.txt'; # Works.
my $from_file2 = <>;
Calling C<import> after C<unimport> would restore the DATA handle, but
B<wouldn't rewind it>, i.e. it would continue from where you stopped
(see t/04-unimport.t).
=head2 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.
=head1 EXPORT
Nothing. There are 2 subroutines you can call via their fully qualified names,
though:
=over 4
=item ARGV::OrDATA::is_using_argv()
Returns 0 when ARGV reads from DATA, 1 otherwise.
=item ARGV::OrDATA::is_using_data()
Returns 1 when ARGV reads from DATA, 0 otherwise.
=back
=head1 AUTHOR
E. Choroba, C<< <choroba at cpan.org> >>
=head1 BUGS
Please report any bugs or feature requests to the GitHub repository at
L<https://github.com/choroba/argv-ordata>.
=head1 SUPPORT
You can find documentation for this module with the perldoc command.
perldoc ARGV::OrDATA
You can also look for information at:
=over 4
=item * MetaCPAN
L<http://mcpan.org/pod/ARGV-OrDATA>
=item * GitHub
L<https://github.com/choroba/argv-ordata>
=back
=head1 ACKNOWLEDGEMENTS
t/00-data.t view on Meta::CPAN
skip "Can't run the test when stdin is not the terminal", 3
unless -t;
my $PIPE;
if ('MSWin32' eq $^O && $] < 5.022) {
open $PIPE, '-|', "$^X $FindBin::Bin/script.pl" or die $!;
} else {
open $PIPE, '-|', $^X, "$FindBin::Bin/script.pl" or die $!;
}
is $_, "data $.\n", "Read line $. from DATA" while <$PIPE>;
ok eof $PIPE, 'closed DATA';
}
t/03-package.t view on Meta::CPAN
use FindBin;
use lib $FindBin::Bin;
use My;
BEGIN {
open *STDIN, '<&', IO::Pty->new
if ! -t && eval { require IO::Pty };
}
use ARGV::OrDATA qw{ My };
SKIP: {
skip "Can't run the test when stdin is not the terminal", 3
unless -t;
is $_, "package $.\n", "Read line $. from package" while <>;
ok eof, 'end of package';
}
__DATA__
data 1
data 2
t/04-unimport.t view on Meta::CPAN
use Test::More tests => 4;
use FindBin;
BEGIN {
open *STDIN, '<&', IO::Pty->new
if ! -t && eval { require IO::Pty };
}
use ARGV::OrDATA;
SKIP: {
skip "Can't run the test when stdin is not the terminal", 4
unless -t;
my $file = "$FindBin::Bin/input.txt";
is scalar <>, "data 1\n", 'read line 1 from data';
@ARGV = $file;
is scalar <>, "data 2\n", 'changes to @ARGV ignored';
'ARGV::OrDATA'->unimport;
@ARGV = $file;
is scalar <>, "file 1\n", 'unimport works';
'ARGV::OrDATA'->import;
is scalar <>, "data 3\n", 'switching back to data';
}
__DATA__
data 1
data 2
data 3
package
My;
use warnings;
use strict;
sub imported { 1 }
__PACKAGE__
__DATA__
package 1
package 2
t/is_using.pl view on Meta::CPAN
#!/usr/bin/perl
use warnings;
use strict;
use ARGV::OrDATA;
print ARGV::OrDATA::is_using_argv() ? 1 : 0;
print ARGV::OrDATA::is_using_data() ? 1 : 0;
print "\n";
__DATA__
1
t/is_using_package.pl view on Meta::CPAN
#!/usr/bin/perl
use warnings;
use strict;
package
My;
use ARGV::OrDATA;
print ARGV::OrDATA::is_using_argv() ? 1 : 0;
print ARGV::OrDATA::is_using_data() ? 1 : 0;
print "\n";
__DATA__
1
#!/usr/bin/perl
use warnings;
use strict;
use Test::More tests => 3;
use ARGV::OrDATA;
while (<>) {
is $_, "pipe $.\n", "read line $. from stdin";
}
ok eof *STDIN, 'end of stdin';
__DATA__
data 1
data 2
t/script.pl view on Meta::CPAN
#!/usr/bin/perl
use warnings;
use strict;
use ARGV::OrDATA;
while (<>) {
print;
}
__DATA__
data 1
data 2
xt/changes.t view on Meta::CPAN
#!/usr/bin/perl
use warnings;
use strict;
use Test::More tests => 1;
use ARGV::OrDATA;
use FindBin;
my $module_version = $ARGV::OrDATA::VERSION;
my $dir = $FindBin::Bin . '/..';
open my $changes, '<', "$dir/Changes" or die 'Changes not found';
my $found;
while (<$changes>) {
$found = 1, last if /\Q$module_version\E\s/;
}
ok $found, "$module_version found in Changes";
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