termcap.pm

UNIX下perl实现代码

# Pod::Text::Termcap -- Convert POD data to ASCII text with format escapes.
# $Id: Termcap.pm,v 1.0 2000/12/25 12:52:48 eagle Exp $
#
# Copyright 1999 by Russ Allbery <[e-mail]>
#
# This program is free software; you can redistribute it and/or modify it
# under the same terms as Perl itself.
#
# This is a simple subclass of Pod::Text that overrides a few key methods to
# output the right termcap escape sequences for formatted text on the
# current terminal type.

############################################################################
# Modules and declarations
############################################################################

package Pod::Text::Termcap;

require 5.004;

use Pod::Text ();
use POSIX ();
use Term::Cap;

use strict;
use vars qw(@ISA $VERSION);

@ISA = qw(Pod::Text);

# Don't use the CVS revision as the version, since this module is also in
# Perl core and too many things could munge CVS magic revision strings.
# This number should ideally be the same as the CVS revision in podlators,
# however.
$VERSION = 1.00;


############################################################################
# Overrides
############################################################################

# In the initialization method, grab our terminal characteristics as well as
# do all the stuff we normally do.
sub initialize {
    my $self = shift;

    # The default Term::Cap path won't work on Solaris.
    $ENV{TERMPATH} = "$ENV{HOME}/.termcap:/etc/termcap"
        . ":/usr/share/misc/termcap:/usr/share/lib/termcap";

    my $termios = POSIX::Termios->new;
    $termios->getattr;
    my $ospeed = $termios->getospeed;
    my $term = Tgetent Term::Cap { TERM => undef, OSPEED => $ospeed };
    $$self{BOLD} = $$term{_md} or die 'BOLD';
    $$self{UNDL} = $$term{_us} or die 'UNDL';
    $$self{NORM} = $$term{_me} or die 'NORM';

    unless (defined $$self{width}) {
        $$self{width} = $ENV{COLUMNS} || $$term{_co} || 78;
        $$self{width} -= 2;
    }

    $self->SUPER::initialize;
}

# Make level one headings bold.
sub cmd_head1 {
    my $self = shift;
    local $_ = shift;
    s/\s+$//;
    $self->SUPER::cmd_head1 ("$$self{BOLD}$_$$self{NORM}");
}

# Make level two headings bold.
sub cmd_head2 {
    my $self = shift;
    local $_ = shift;
    s/\s+$//;
    $self->SUPER::cmd_head2 ("$$self{BOLD}$_$$self{NORM}");
}

# Fix up B<> and I<>.  Note that we intentionally don't do F<>.
sub seq_b { my $self = shift; return "$$self{BOLD}$_[0]$$self{NORM}" }
sub seq_i { my $self = shift; return "$$self{UNDL}$_[0]$$self{NORM}" }

# Override the wrapping code to igore the special sequences.
sub wrap {
    my $self = shift;
    local $_ = shift;
    my $output = '';
    my $spaces = ' ' x $$self{MARGIN};
    my $width = $$self{width} - $$self{MARGIN};
    my $code = "(?:\Q$$self{BOLD}\E|\Q$$self{UNDL}\E|\Q$$self{NORM}\E)";
    while (length > $width) {
        if (s/^((?:$code?[^\n]){0,$width})\s+//
            || s/^((?:$code?[^\n]){$width})//) {
            $output .= $spaces . $1 . "\n";
        } else {
            last;
        }
    }
    $output .= $spaces . $_;
    $output =~ s/\s+$/\n\n/;
    $output;
}


############################################################################
# Module return value and documentation
############################################################################

1;
__END__

=head1 NAME

Pod::Text::Color - Convert POD data to ASCII text with format escapes

=head1 SYNOPSIS

    use Pod::Text::Termcap;
    my $parser = Pod::Text::Termcap->new (sentence => 0, width => 78);

    # Read POD from STDIN and write to STDOUT.
    $parser->parse_from_filehandle;

    # Read POD from file.pod and write to file.txt.
    $parser->parse_from_file ('file.pod', 'file.txt');

=head1 DESCRIPTION

Pod::Text::Termcap is a simple subclass of Pod::Text that highlights output
text using the correct termcap escape sequences for the current terminal.
Apart from the format codes, it in all ways functions like Pod::Text.  See
L<Pod::Text> for details and available options.

=head1 SEE ALSO

L<Pod::Text|Pod::Text>, L<Pod::Parser|Pod::Parser>

=head1 AUTHOR

Russ Allbery E<lt>[e-mail]<gt>.

=cut