lib/perl5/5.6.1/Pod/Text/Termcap.pm

   1 # Pod::Text::Termcap -- Convert POD data to ASCII text with format escapes.
   2 # $Id: Termcap.pm,v 1.0 2000/12/25 12:52:48 eagle Exp $
   3 #
   4 # Copyright 1999 by Russ Allbery <rra@stanford.edu>
   5 #
   6 # This program is free software; you can redistribute it and/or modify it
   7 # under the same terms as Perl itself.
   8 #
   9 # This is a simple subclass of Pod::Text that overrides a few key methods to
  10 # output the right termcap escape sequences for formatted text on the
  11 # current terminal type.
  12
  13 ############################################################################
  14 # Modules and declarations
  15 ############################################################################
  16
  17 package Pod::Text::Termcap;
  18
  19 require 5.004;
  20
  21 use Pod::Text ();
  22 use POSIX ();
  23 use Term::Cap;
  24
  25 use strict;
  26 use vars qw(@ISA $VERSION);
  27
  28 @ISA = qw(Pod::Text);
  29
  30 # Don't use the CVS revision as the version, since this module is also in
  31 # Perl core and too many things could munge CVS magic revision strings.
  32 # This number should ideally be the same as the CVS revision in podlators,
  33 # however.
  34 $VERSION = 1.00;
  35
  36
  37 ############################################################################
  38 # Overrides
  39 ############################################################################
  40
  41 # In the initialization method, grab our terminal characteristics as well as
  42 # do all the stuff we normally do.
  43 sub initialize {
  44     my $self = shift;
  45
  46     # The default Term::Cap path won't work on Solaris.
  47     $ENV{TERMPATH} = "$ENV{HOME}/.termcap:/etc/termcap"
  48         . ":/usr/share/misc/termcap:/usr/share/lib/termcap";
  49
  50     my $termios = POSIX::Termios->new;
  51     $termios->getattr;
  52     my $ospeed = $termios->getospeed;
  53     my $term = Tgetent Term::Cap { TERM => undef, OSPEED => $ospeed };
  54     $$self{BOLD} = $$term{_md} or die 'BOLD';
  55     $$self{UNDL} = $$term{_us} or die 'UNDL';
  56     $$self{NORM} = $$term{_me} or die 'NORM';
  57
  58     unless (defined $$self{width}) {
  59         $$self{width} = $ENV{COLUMNS} || $$term{_co} || 78;
  60         $$self{width} -= 2;
  61     }
  62
  63     $self->SUPER::initialize;
  64 }
  65
  66 # Make level one headings bold.
  67 sub cmd_head1 {
  68     my $self = shift;
  69     local $_ = shift;
  70     s/\s+$//;
  71     $self->SUPER::cmd_head1 ("$$self{BOLD}$_$$self{NORM}");
  72 }
  73
  74 # Make level two headings bold.
  75 sub cmd_head2 {
  76     my $self = shift;
  77     local $_ = shift;
  78     s/\s+$//;
  79     $self->SUPER::cmd_head2 ("$$self{BOLD}$_$$self{NORM}");
  80 }
  81
  82 # Fix up B<> and I<>.  Note that we intentionally don't do F<>.
  83 sub seq_b { my $self = shift; return "$$self{BOLD}$_[0]$$self{NORM}" }
  84 sub seq_i { my $self = shift; return "$$self{UNDL}$_[0]$$self{NORM}" }
  85
  86 # Override the wrapping code to igore the special sequences.
  87 sub wrap {
  88     my $self = shift;
  89     local $_ = shift;
  90     my $output = '';
  91     my $spaces = ' ' x $$self{MARGIN};
  92     my $width = $$self{width} - $$self{MARGIN};
  93     my $code = "(?:\Q$$self{BOLD}\E|\Q$$self{UNDL}\E|\Q$$self{NORM}\E)";
  94     while (length > $width) {
  95         if (s/^((?:$code?[^\n]){0,$width})\s+//
  96             || s/^((?:$code?[^\n]){$width})//) {
  97             $output .= $spaces . $1 . "\n";
  98         } else {
  99             last;
 100         }
 101     }
 102     $output .= $spaces . $_;
 103     $output =~ s/\s+$/\n\n/;
 104     $output;
 105 }
 106
 107
 108 ############################################################################
 109 # Module return value and documentation
 110 ############################################################################
 111
 112 1;
 113 __END__
 114
 115 =head1 NAME
 116
 117 Pod::Text::Color - Convert POD data to ASCII text with format escapes
 118
 119 =head1 SYNOPSIS
 120
 121     use Pod::Text::Termcap;
 122     my $parser = Pod::Text::Termcap->new (sentence => 0, width => 78);
 123
 124     # Read POD from STDIN and write to STDOUT.
 125     $parser->parse_from_filehandle;
 126
 127     # Read POD from file.pod and write to file.txt.
 128     $parser->parse_from_file ('file.pod', 'file.txt');
 129
 130 =head1 DESCRIPTION
 131
 132 Pod::Text::Termcap is a simple subclass of Pod::Text that highlights output
 133 text using the correct termcap escape sequences for the current terminal.
 134 Apart from the format codes, it in all ways functions like Pod::Text.  See
 135 L<Pod::Text> for details and available options.
 136
 137 =head1 SEE ALSO
 138
 139 L<Pod::Text|Pod::Text>, L<Pod::Parser|Pod::Parser>
 140
 141 =head1 AUTHOR
 142
 143 Russ Allbery E<lt>rra@stanford.eduE<gt>.
 144
 145 =cut