Is Morningtide out yet? Guess not.

For long running processes like that, I usually tee the output. And since Windows doesn't have tee, I wrote one quickly.

tee.bat:

@rem = '--*-Perl-*--
@echo off
if "%OS%" == "Windows_NT" goto WinNT
perl -x -S "%0" %1 %2 %3 %4 %5 %6 %7 %8 %9
goto endofperl
:WinNT
perl -x -S %0 %*
if NOT "%COMSPEC%" == "%SystemRoot%\system32\cmd.exe" goto endofperl
if %errorlevel% == 9009 echo You do not have Perl in your PATH.
if errorlevel 1 goto script_failed_so_exit_with_non_zero_val 2>nul
goto endofperl
@rem ';
#!perl
#line 15

use strict;
use warnings;

use IO::Handle   qw( );
use Getopt::Long qw( );

my $opt_a;

sub usage {
   print STDERR (<<'__EOI__');
usage: tee [<options>] [--] [file [...]]
Use tee --help for help.
__EOI__
   exit(1);
}

sub help {
   print(<<'__EOI__');
usage: tee [<options>] [--] [file [...]]
Use tee --help for help.

Options:
   -a  Append the output to the files rather than overwriting them.
   -i  Ignore the SIGINT signal.
__EOI__
   exit(0);
}

sub process_args {
   Getopt::Long::Configure('posix_default');
   Getopt::Long::GetOptions(
      "a"        => \$opt_a,
      "help|h|?" => \&help,
   ) or usage();
}

{
   process_args();

   my $mode      = ($opt_a ? '>>'   : '>'     );
   my $mode_text = ($opt_a ? 'open' : 'create');

   my @fhs;
   my %fh_names;

   {
      my $fh = \*STDOUT;
      push @fhs, $fh;
      $fh_names{$fh} = 'STDOUT';
   }
   
   foreach (@ARGV) {
      my $fh;
      if (!open($fh, $mode, $_)) {
         die("Unable to open file \"$_\": $!\n");
      }

      push @fhs, $fh;
      $fh_names{$fh} = "file \"$_\"";
   }

   binmode(STDIN);
   foreach my $fh (@fhs) {
      $fh->autoflush(1);
      binmode($fh);
   }

   for (;;) {   
      my $buf = '';
      my $rv = sysread(STDIN, $buf, 4096);
   
      if (not defined $rv) {
         die("Unable to read from STDIN: $!\n");
      }
   
      if (not $rv) {
         last;
      }
      
      foreach my $fh (@fhs) {
         if (!$fh->print($buf)) {
            die("Unable to write to $fh_names{$fh}: $!\n");
         }
      }
   }   
}

__END__
:endofperl
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