#!/usr/bin/perl --

use warnings;
use strict;

use XML::Rules;
use Text::CSV_XS;

Main(@ARGV);
exit(0);

sub Main {
  use autodie;
  open my $File, shift || 'alpha31.xml';
  RuleCvs( $File, \*STDOUT );

#~ use FileHandle;
#~   RuleCvs( FileHandle->new(shift // 'alpha31.xml'), \*STDOUT ); use
+ 5.10.0;
#~   RuleCvs( FileHandle->new(shift || 'alpha31.xml'), \*STDOUT );
#~   RuleCvs( FileHandle->new(shift), \*STDOUT );

} ## end sub Main

BEGIN {
  my (@Heads) = qw(
    Subject
    Course
    Title
    Description
    Prequisites
    Corequisites
    Requisites
    LectureHours
    LaboratoryHours
    CreditHours
    Flags
  );

  sub RuleCvs {
    my ( $InFh, $OutFh ) = @_;
    my $csv = Text::CSV_XS->new( { eol => "\n" } );
    my $parser = XML::Rules->new(
      rules => [
        _default => 'content',
        Class    => sub {
          $csv->print( $_[4]->{parameters}, [ @{ $_[1] }{@Heads} ] );
          return;
          }
      ]
    );

    print $OutFh join( ',', @Heads ), "\n";
    $parser->parse( $InFh, $OutFh );

    return;
  } ## end sub RuleCvs
} ## end BEGIN
__END__
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