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

   1 # Pod::Text::Color -- Convert POD data to formatted color ASCII text
   2 # $Id: Color.pm,v 0.6 2000/12/25 12:52:39 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 just a basic proof of concept.  It should later be modified to
  10 # make better use of color, take options changing what colors are used for
  11 # what text, and the like.
  12
  13 ############################################################################
  14 # Modules and declarations
  15 ############################################################################
  16
  17 package Pod::Text::Color;
  18
  19 require 5.004;
  20
  21 use Pod::Text ();
  22 use Term::ANSIColor qw(colored);
  23
  24 use strict;
  25 use vars qw(@ISA $VERSION);
  26
  27 @ISA = qw(Pod::Text);
  28
  29 # Don't use the CVS revision as the version, since this module is also in
  30 # Perl core and too many things could munge CVS magic revision strings.
  31 # This number should ideally be the same as the CVS revision in podlators,
  32 # however.
  33 $VERSION = 0.06;
  34
  35
  36 ############################################################################
  37 # Overrides
  38 ############################################################################
  39
  40 # Make level one headings bold.
  41 sub cmd_head1 {
  42     my $self = shift;
  43     local $_ = shift;
  44     s/\s+$//;
  45     $self->SUPER::cmd_head1 (colored ($_, 'bold'));
  46 }
  47
  48 # Make level two headings bold.
  49 sub cmd_head2 {
  50     my $self = shift;
  51     local $_ = shift;
  52     s/\s+$//;
  53     $self->SUPER::cmd_head2 (colored ($_, 'bold'));
  54 }
  55
  56 # Fix the various interior sequences.
  57 sub seq_b { return colored ($_[1], 'bold')   }
  58 sub seq_f { return colored ($_[1], 'cyan')   }
  59 sub seq_i { return colored ($_[1], 'yellow') }
  60
  61 # We unfortunately have to override the wrapping code here, since the normal
  62 # wrapping code gets really confused by all the escape sequences.
  63 sub wrap {
  64     my $self = shift;
  65     local $_ = shift;
  66     my $output = '';
  67     my $spaces = ' ' x $$self{MARGIN};
  68     my $width = $$self{width} - $$self{MARGIN};
  69     while (length > $width) {
  70         if (s/^((?:(?:\e\[[\d;]+m)?[^\n]){0,$width})\s+//
  71             || s/^((?:(?:\e\[[\d;]+m)?[^\n]){$width})//) {
  72             $output .= $spaces . $1 . "\n";
  73         } else {
  74             last;
  75         }
  76     }
  77     $output .= $spaces . $_;
  78     $output =~ s/\s+$/\n\n/;
  79     $output;
  80 }
  81
  82 ############################################################################
  83 # Module return value and documentation
  84 ############################################################################
  85
  86 1;
  87 __END__
  88
  89 =head1 NAME
  90
  91 Pod::Text::Color - Convert POD data to formatted color ASCII text
  92
  93 =head1 SYNOPSIS
  94
  95     use Pod::Text::Color;
  96     my $parser = Pod::Text::Color->new (sentence => 0, width => 78);
  97
  98     # Read POD from STDIN and write to STDOUT.
  99     $parser->parse_from_filehandle;
 100
 101     # Read POD from file.pod and write to file.txt.
 102     $parser->parse_from_file ('file.pod', 'file.txt');
 103
 104 =head1 DESCRIPTION
 105
 106 Pod::Text::Color is a simple subclass of Pod::Text that highlights output
 107 text using ANSI color escape sequences.  Apart from the color, it in all
 108 ways functions like Pod::Text.  See L<Pod::Text> for details and available
 109 options.
 110
 111 Term::ANSIColor is used to get colors and therefore must be installed to use
 112 this module.
 113
 114 =head1 BUGS
 115
 116 This is just a basic proof of concept.  It should be seriously expanded to
 117 support configurable coloration via options passed to the constructor, and
 118 B<pod2text> should be taught about those.
 119
 120 =head1 SEE ALSO
 121
 122 L<Pod::Text|Pod::Text>, L<Pod::Parser|Pod::Parser>
 123
 124 =head1 AUTHOR
 125
 126 Russ Allbery E<lt>rra@stanford.eduE<gt>.
 127
 128 =cut