package TAP::Formatter::Color;

use strict;

use vars qw($VERSION);

use constant IS_WIN32 => ( $^O =~ /^(MS)?Win32$/ );

my $NO_COLOR;

BEGIN {
    $NO_COLOR = 0;

    if (IS_WIN32) {
        eval 'use Win32::Console';
        if ($@) {
            $NO_COLOR = $@;
        }
        else {
            my $console = Win32::Console->new( STD_OUTPUT_HANDLE() );

            # eval here because we might not know about these variables
            my $fg = eval '$FG_LIGHTGRAY';
            my $bg = eval '$BG_BLACK';

            *set_color = sub {
                my ( $self, $output, $color ) = @_;

                my $var;
                if ( $color eq 'reset' ) {
                    $fg = eval '$FG_LIGHTGRAY';
                    $bg = eval '$BG_BLACK';
                }
                elsif ( $color =~ /^on_(.+)$/ ) {
                    $bg = eval '$BG_' . uc($1);
                }
                else {
                    $fg = eval '$FG_' . uc($color);
                }

                # In case of colors that aren't defined
                $self->set_color('reset')
                  unless defined $bg && defined $fg;

                $console->Attr( $bg | $fg );
            };
        }
    }
    else {
        eval 'use Term::ANSIColor';
        if ($@) {
            $NO_COLOR = $@;
        }
        else {
            *set_color = sub {
                my ( $self, $output, $color ) = @_;
                $output->( color($color) );
            };
        }
    }

    if ($NO_COLOR) {
        *set_color = sub { };
    }
}

=head1 NAME

TAP::Formatter::Color - Run Perl test scripts with color

=head1 VERSION

Version 3.05

=cut

$VERSION = '3.05';

=head1 DESCRIPTION

Note that this harness is I<experimental>.  You may not like the colors I've
chosen and I haven't yet provided an easy way to override them.

This test harness is the same as L<TAP::Harness>, but test results are output
in color.  Passing tests are printed in green.  Failing tests are in red.
Skipped tests are blue on a white background and TODO tests are printed in
white.

If L<Term::ANSIColor> cannot be found (or L<Win32::Console> if running
under Windows) tests will be run without color.

=head1 SYNOPSIS

 use TAP::Formatter::Color;
 my $harness = TAP::Formatter::Color->new( \%args );
 $harness->runtests(@tests);

=head1 METHODS

=head2 Class Methods

=head3 C<new>

The constructor returns a new C<TAP::Formatter::Color> object. If
L<Term::ANSIColor> is not installed, returns undef.

=cut

sub new {
    my $class = shift;

    if ($NO_COLOR) {

        # shorten that message a bit
        ( my $error = $NO_COLOR ) =~ s/ in \@INC .*//s;
        warn "Note: Cannot run tests in color: $error\n";
        return;
    }

    return bless {}, $class;
}

##############################################################################

=head3 C<can_color>

  Test::Formatter::Color->can_color()

Returns a boolean indicating whether or not this module can actually
generate colored output. This will be false if it could not load the
modules needed for the current platform.

=cut

sub can_color {
    return !$NO_COLOR;
}

=head3 C<set_color>

Set the output color.

=cut

1;
