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package ExtUtils::PL2Bat;
$ExtUtils::PL2Bat::VERSION = '0.005';
use strict;
use warnings;
use 5.006;
use Config;
use Carp qw/croak/;
# In core, we can't use any other modules except those that already live in
# lib/, so Exporter is not available to us.
sub import {
        my ($self, @functions) = @_;
        @functions = 'pl2bat' if not @functions;
        my $caller = caller;
        for my $function (@functions) {
                no strict 'refs';
                *{"$caller\::$function"} = \&{$function};
        }
}
sub pl2bat {
        my %opts = @_;
        # NOTE: %0 is already enclosed in doublequotes by cmd.exe, as appropriate
        $opts{ntargs}    = '-x -S %0 %*' unless exists $opts{ntargs};
        $opts{otherargs} = '-x -S "%0" %1 %2 %3 %4 %5 %6 %7 %8 %9' unless exists $opts{otherargs};
        $opts{stripsuffix} = qr/\.plx?/ unless exists $opts{stripsuffix};
        if (not exists $opts{out}) {
                $opts{out} = $opts{in};
                $opts{out} =~ s/$opts{stripsuffix}$//i;
                $opts{out} .= '.bat' unless $opts{in} =~ /\.bat$/i or $opts{in} eq '-';
        }
        my $head = <<"EOT";
        \@rem = '--*-Perl-*--
        \@set "ErrorLevel="
        \@if "%OS%" == "Windows_NT" \@goto WinNT
        \@perl $opts{otherargs}
        \@set ErrorLevel=%ErrorLevel%
        \@goto endofperl
        :WinNT
        \@perl $opts{ntargs}
        \@set ErrorLevel=%ErrorLevel%
        \@if NOT "%COMSPEC%" == "%SystemRoot%\\system32\\cmd.exe" \@goto endofperl
        \@if %ErrorLevel% == 9009 \@echo You do not have Perl in your PATH.
        \@goto endofperl
        \@rem ';
EOT
        $head =~ s/^\s+//gm;
        my $headlines = 2 + ($head =~ tr/\n/\n/);
        my $tail = <<'EOT';
        __END__
        :endofperl
        @set "ErrorLevel=" & @goto _undefined_label_ 2>NUL || @"%COMSPEC%" /d/c @exit %ErrorLevel%
EOT
        $tail =~ s/^\s+//gm;
        my $linedone = 0;
        my $taildone = 0;
        my $linenum = 0;
        my $skiplines = 0;
        my $start = $Config{startperl};
        $start = '#!perl' unless $start =~ /^#!.*perl/;
        open my $in, '<', $opts{in} or croak "Can't open $opts{in}: $!";
        my @file = <$in>;
        close $in;
        foreach my $line ( @file ) {
                $linenum++;
                if ( $line =~ /^:endofperl\b/ ) {
                        if (!exists $opts{update}) {
                                warn "$opts{in} has already been converted to a batch file!\n";
                                return;
                        }
                        $taildone++;
                }
                if ( not $linedone and $line =~ /^#!.*perl/ ) {
                        if (exists $opts{update}) {
                                $skiplines = $linenum - 1;
                                $line .= '#line '.(1+$headlines)."\n";
                        } else {
        $line .= '#line '.($linenum+$headlines)."\n";
                        }
        $linedone++;
                }
                if ( $line =~ /^#\s*line\b/ and $linenum == 2 + $skiplines ) {
                        $line = '';
                }
        }
        open my $out, '>', $opts{out} or croak "Can't open $opts{out}: $!";
        print $out $head;
        print $out $start, ( $opts{usewarnings} ? ' -w' : '' ),
                                                 "\n#line ", ($headlines+1), "\n" unless $linedone;
        print $out @file[$skiplines..$#file];
        print $out $tail unless $taildone;
        close $out;
        return $opts{out};
}
1;
# ABSTRACT: Batch file creation to run perl scripts on Windows
__END__
HideShow 81 lines of Pod
=pod
=encoding UTF-8
=head1 NAME
ExtUtils::PL2Bat - Batch file creation to run perl scripts on Windows
=head1 VERSION
version 0.005
=head1 OVERVIEW
This module converts a perl script into a batch file that can be executed on Windows/DOS-like operating systems.  This is intended to allow you to use a Perl script like regular programs and batch files where you just enter the name of the script [probably minus the extension] plus any command-line arguments and the script is found in your B<PATH> and run.
=head1 FUNCTIONS
=head2 pl2bat(%opts)
This function takes a perl script and write a batch file that contains the script. This is sometimes necessary
=over 8
=item * C<in>
The name of the script that is to be batchified. This argument is mandatory.
=item * C<out>
The name of the output batch file. If not given, it will be generated using C<in> and C<stripsuffix>.
=item * C<ntargs>
Arguments to invoke perl with in generated batch file when run from
Windows NT.  Defaults to S<'-x -S %0 %*'>.
=item * C<otherargs>
Arguments to invoke perl with in generated batch file except when
run from Windows NT (ie. when run from DOS, Windows 3.1, or Windows 95).
Defaults to S<'-x -S "%0" %1 %2 %3 %4 %5 %6 %7 %8 %9'>.
=item * C<stripsuffix>
Strip a suffix string from file name before appending a ".bat"
suffix.  The suffix is not case-sensitive.  It can be a regex or a string and a trailing
C<$> is always assumed).  Defaults to C<qr/\.plx?/>.
=item * C<usewarnings>
With the C<usewarnings>
option, C<" -w"> is added after the value of C<$Config{startperl}>.
If a line matching C</^#!.*perl/> already exists in the script,
then it is not changed and the B<-w> option is ignored.
=item * C<update>
If the script appears to have already been processed by B<pl2bat>,
then the script is skipped and not processed unless C<update> was
specified.  If C<update> is specified, the existing preamble is replaced.
=back
=head1 ACKNOWLEDGEMENTS
This code was taken from Module::Build and then modified; which had taken it from perl's pl2bat script. This module is an attempt at unifying all three implementations.
=head1 AUTHOR
Leon Timmermans <leont@cpan.org>
=head1 COPYRIGHT AND LICENSE
This software is copyright (c) 2015 by Leon Timmermans.
This is free software; you can redistribute it and/or modify it under
the same terms as the Perl 5 programming language system itself.
=cut