1 # Pod::Text::Overstrike -- Convert POD data to formatted overstrike text
3 # Created by Joe Smith <Joe.Smith@inwap.com> 30-Nov-2000
4 # (based on Pod::Text::Color by Russ Allbery <rra@stanford.edu>)
5 # Copyright 2000 Joe Smith <Joe.Smith@inwap.com>.
6 # Copyright 2001, 2004, 2008 Russ Allbery <rra@stanford.edu>.
8 # This program is free software; you may redistribute it and/or modify it
9 # under the same terms as Perl itself.
11 # This was written because the output from:
13 # pod2text Text.pm > plain.txt; less plain.txt
15 # is not as rich as the output from
17 # pod2man Text.pm | nroff -man > fancy.txt; less fancy.txt
19 # and because both Pod::Text::Color and Pod::Text::Termcap are not device
22 ##############################################################################
23 # Modules and declarations
24 ##############################################################################
26 package Pod::Text::Overstrike;
33 use vars qw(@ISA $VERSION);
39 ##############################################################################
41 ##############################################################################
43 # Make level one headings bold, overridding any existing formatting.
45 my ($self, $attrs, $text) = @_;
47 $text = $self->strip_format ($text);
48 $text =~ s/(.)/$1\b$1/g;
49 return $self->SUPER::cmd_head1 ($attrs, $text);
52 # Make level two headings bold, overriding any existing formatting.
54 my ($self, $attrs, $text) = @_;
56 $text = $self->strip_format ($text);
57 $text =~ s/(.)/$1\b$1/g;
58 return $self->SUPER::cmd_head2 ($attrs, $text);
61 # Make level three headings underscored, overriding any existing formatting.
63 my ($self, $attrs, $text) = @_;
65 $text = $self->strip_format ($text);
66 $text =~ s/(.)/_\b$1/g;
67 return $self->SUPER::cmd_head3 ($attrs, $text);
70 # Level four headings look like level three headings.
72 my ($self, $attrs, $text) = @_;
74 $text = $self->strip_format ($text);
75 $text =~ s/(.)/_\b$1/g;
76 return $self->SUPER::cmd_head4 ($attrs, $text);
79 # The common code for handling all headers. We have to override to avoid
80 # interpolating twice and because we don't want to honor alt.
82 my ($self, $text, $indent, $marker) = @_;
83 $self->item ("\n\n") if defined $$self{ITEM};
84 $text .= "\n" if $$self{opt_loose};
85 my $margin = ' ' x ($$self{opt_margin} + $indent);
86 $self->output ($margin . $text . "\n");
90 # Fix the various formatting codes.
91 sub cmd_b { local $_ = $_[0]->strip_format ($_[2]); s/(.)/$1\b$1/g; $_ }
92 sub cmd_f { local $_ = $_[0]->strip_format ($_[2]); s/(.)/_\b$1/g; $_ }
93 sub cmd_i { local $_ = $_[0]->strip_format ($_[2]); s/(.)/_\b$1/g; $_ }
95 # Output any included code in bold.
97 my ($self, $code) = @_;
98 $code =~ s/(.)/$1\b$1/g;
99 $self->output ($code);
102 # Strip all of the formatting from a provided string, returning the stripped
105 my ($self, $text) = @_;
106 $text =~ s/(.)[\b]\1/$1/g;
111 # We unfortunately have to override the wrapping code here, since the normal
112 # wrapping code gets really confused by all the backspaces.
117 my $spaces = ' ' x $$self{MARGIN};
118 my $width = $$self{opt_width} - $$self{MARGIN};
119 while (length > $width) {
120 # This regex represents a single character, that's possibly underlined
121 # or in bold (in which case, it's three characters; the character, a
122 # backspace, and a character). Use [^\n] rather than . to protect
123 # against odd settings of $*.
124 my $char = '(?:[^\n][\b])?[^\n]';
125 if (s/^((?>$char){0,$width})(?:\Z|\s+)//) {
126 $output .= $spaces . $1 . "\n";
131 $output .= $spaces . $_;
132 $output =~ s/\s+$/\n\n/;
136 ##############################################################################
137 # Module return value and documentation
138 ##############################################################################
148 Pod::Text::Overstrike - Convert POD data to formatted overstrike text
151 overstruck Overstruck Allbery terminal's
155 use Pod::Text::Overstrike;
156 my $parser = Pod::Text::Overstrike->new (sentence => 0, width => 78);
158 # Read POD from STDIN and write to STDOUT.
159 $parser->parse_from_filehandle;
161 # Read POD from file.pod and write to file.txt.
162 $parser->parse_from_file ('file.pod', 'file.txt');
166 Pod::Text::Overstrike is a simple subclass of Pod::Text that highlights
167 output text using overstrike sequences, in a manner similar to nroff.
168 Characters in bold text are overstruck (character, backspace, character)
169 and characters in underlined text are converted to overstruck underscores
170 (underscore, backspace, character). This format was originally designed
171 for hard-copy terminals and/or line printers, yet is readable on soft-copy
174 Overstruck text is best viewed by page-at-a-time programs that take
175 advantage of the terminal's B<stand-out> and I<underline> capabilities, such
176 as the less program on Unix.
178 Apart from the overstrike, it in all ways functions like Pod::Text. See
179 L<Pod::Text> for details and available options.
183 Currently, the outermost formatting instruction wins, so for example
184 underlined text inside a region of bold text is displayed as simply bold.
185 There may be some better approach possible.
189 L<Pod::Text>, L<Pod::Simple>
191 The current version of this module is always available from its web site at
192 L<http://www.eyrie.org/~eagle/software/podlators/>. It is also part of the
193 Perl core distribution as of 5.6.0.
197 Joe Smith <Joe.Smith@inwap.com>, using the framework created by Russ Allbery
200 =head1 COPYRIGHT AND LICENSE
202 Copyright 2000 by Joe Smith <Joe.Smith@inwap.com>.
203 Copyright 2001, 2004, 2008 by Russ Allbery <rra@stanford.edu>.
205 This program is free software; you may redistribute it and/or modify it
206 under the same terms as Perl itself.