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# Convert POD data to formatted overstrike text # # This was written because the output from: # # pod2text Text.pm > plain.txt; less plain.txt # # is not as rich as the output from # # pod2man Text.pm | nroff -man > fancy.txt; less fancy.txt # # and because both Pod::Text::Color and Pod::Text::Termcap are not device # independent. # # SPDX-License-Identifier: GPL-1.0-or-later OR Artistic-1.0-Perl ############################################################################## # Modules and declarations ############################################################################## package Pod::Text::Overstrike; use 5.010; use strict; use warnings; use Pod::Text (); our @ISA = qw(Pod::Text); our $VERSION = '5.01'; ############################################################################## # Overrides ############################################################################## # Make level one headings bold, overriding any existing formatting. sub cmd_head1 { my ($self, $attrs, $text) = @_; $text =~ s/\s+$//; $text = $self->strip_format ($text); $text =~ s/(.)/$1\b$1/g; return $self->SUPER::cmd_head1 ($attrs, $text); } # Make level two headings bold, overriding any existing formatting. sub cmd_head2 { my ($self, $attrs, $text) = @_; $text =~ s/\s+$//; $text = $self->strip_format ($text); $text =~ s/(.)/$1\b$1/g; return $self->SUPER::cmd_head2 ($attrs, $text); } # Make level three headings underscored, overriding any existing formatting. sub cmd_head3 { my ($self, $attrs, $text) = @_; $text =~ s/\s+$//; $text = $self->strip_format ($text); $text =~ s/(.)/_\b$1/g; return $self->SUPER::cmd_head3 ($attrs, $text); } # Level four headings look like level three headings. sub cmd_head4 { my ($self, $attrs, $text) = @_; $text =~ s/\s+$//; $text = $self->strip_format ($text); $text =~ s/(.)/_\b$1/g; return $self->SUPER::cmd_head4 ($attrs, $text); } # The common code for handling all headers. We have to override to avoid # interpolating twice and because we don't want to honor alt. sub heading { my ($self, $text, $indent, $marker) = @_; $self->item ("\n\n") if defined $$self{ITEM}; $text .= "\n" if $$self{opt_loose}; my $margin = ' ' x ($$self{opt_margin} + $indent); $self->output ($margin . $text . "\n"); return ''; } # Fix the various formatting codes. sub cmd_b { local $_ = $_[0]->strip_format ($_[2]); s/(.)/$1\b$1/g; $_ } sub cmd_f { local $_ = $_[0]->strip_format ($_[2]); s/(.)/_\b$1/g; $_ } sub cmd_i { local $_ = $_[0]->strip_format ($_[2]); s/(.)/_\b$1/g; $_ } # Output any included code in bold. sub output_code { my ($self, $code) = @_; $code =~ s/(.)/$1\b$1/g; $self->output ($code); } # Strip all of the formatting from a provided string, returning the stripped # version. sub strip_format { my ($self, $text) = @_; $text =~ s/(.)[\b]\1/$1/g; $text =~ s/_[\b]//g; return $text; } # We unfortunately have to override the wrapping code here, since the normal # wrapping code gets really confused by all the backspaces. sub wrap { my $self = shift; local $_ = shift; my $output = ''; my $spaces = ' ' x $$self{MARGIN}; my $width = $$self{opt_width} - $$self{MARGIN}; while (length > $width) { # This regex represents a single character, that's possibly underlined # or in bold (in which case, it's three characters; the character, a # backspace, and a character). Use [^\n] rather than . to protect # against odd settings of $*. my $char = '(?:[^\n][\b])?[^\n]'; if (s/^((?>$char){0,$width})(?:\Z|\s+)//) { $output .= $spaces . $1 . "\n"; } else { last; } } $output .= $spaces . $_; $output =~ s/\s+$/\n\n/; return $output; } ############################################################################## # Module return value and documentation ############################################################################## 1; __END__ =for stopwords overstrike overstruck Overstruck Allbery terminal's =head1 NAME Pod::Text::Overstrike - Convert POD data to formatted overstrike text =head1 SYNOPSIS use Pod::Text::Overstrike; my $parser = Pod::Text::Overstrike->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::Overstrike is a simple subclass of Pod::Text that highlights output text using overstrike sequences, in a manner similar to nroff. Characters in bold text are overstruck (character, backspace, character) and characters in underlined text are converted to overstruck underscores (underscore, backspace, character). This format was originally designed for hard-copy terminals and/or line printers, yet is readable on soft-copy (CRT) terminals. Overstruck text is best viewed by page-at-a-time programs that take advantage of the terminal's B<stand-out> and I<underline> capabilities, such as the less program on Unix. Apart from the overstrike, it in all ways functions like Pod::Text. See L<Pod::Text> for details and available options. =head1 BUGS Currently, the outermost formatting instruction wins, so for example underlined text inside a region of bold text is displayed as simply bold. There may be some better approach possible. =head1 COMPATIBILITY Pod::Text::Overstrike 1.01 (based on L<Pod::Parser>) was the first version of this module included with Perl, in Perl 5.6.1. The current API based on L<Pod::Simple> was added in Pod::Text::Overstrike 2.00, included in Perl 5.9.3. Several problems with wrapping and line length were fixed as recently as Pod::Text::Overstrike 2.04, included in Perl 5.11.5. This module inherits its API and most behavior from Pod::Text, so the details in L<Pod::Text/COMPATIBILITY> also apply. Pod::Text and Pod::Text::Overstrike have had the same module version since 4.00, included in Perl 5.23.7. (They unfortunately diverge in confusing ways prior to that.) =head1 AUTHOR Originally written by Joe Smith <Joe.Smith@inwap.com>, using the framework created by Russ Allbery <rra@cpan.org>. Subsequently updated by Russ Allbery. =head1 COPYRIGHT AND LICENSE Copyright 2000 by Joe Smith <Joe.Smith@inwap.com> Copyright 2001, 2004, 2008, 2014, 2018-2019, 2022 by Russ Allbery <rra@cpan.org> This program is free software; you may redistribute it and/or modify it under the same terms as Perl itself. =head1 SEE ALSO L<Pod::Text>, L<Pod::Simple> The current version of this module is always available from its web site at L<https://www.eyrie.org/~eagle/software/podlators/>. It is also part of the Perl core distribution as of 5.6.0. =cut # Local Variables: # copyright-at-end-flag: t # End: