#!/usr/bin/env perl

use strict;
use warnings;

use Test::More;

BEGIN {
   use_ok 'MCE::Grep';
}

##  preparation

my $in_file = MCE->tmp_dir . '/input.txt';
my $fh_data = \*DATA;

open my $fh, '>', $in_file;
binmode $fh;
print {$fh} "1\n2\n3\n4\n5\n6\n7\n8\n9\n";
close $fh;

my @a;

MCE::Grep::init {
   max_workers => 2
};

sub _task { chomp; $_ % 3 == 0 }

##  mce_grep can take a code block, e.g: mce_grep { code } ( 1..9 )
##  below, workers will persist between runs

@a = mce_grep \&_task, ( 1..9 );
is( join('', @a), '369', 'block_ref: check results for array' );

@a = mce_grep_f \&_task, $in_file;
is( join('', @a), '369', 'block_ref: check results for path' );

@a = mce_grep_f \&_task, $fh_data;
is( join('', @a), '369', 'block_ref: check results for glob' );

@a = mce_grep_s \&_task, 1, 9;
is( join('', @a), '369', 'block_ref: check results for sequence' );

MCE::Grep::finish;

##  cleanup

unlink $in_file;

done_testing;

__DATA__
1
2
3
4
5
6
7
8
9