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It should later be modified to make # better use of color, take options changing what colors are used for what # text, and the like. # # SPDX-License-Identifier: GPL-1.0-or-later OR Artistic-1.0-Perl ############################################################################## # Modules and declarations ############################################################################## package Pod::Text::Color; use 5.006; use strict; use warnings; use Pod::Text (); use Term::ANSIColor qw(color colored); use vars qw(@ISA $VERSION); @ISA = qw(Pod::Text); $VERSION = '4.11'; ############################################################################## # Overrides ############################################################################## # Make level one headings bold. sub cmd_head1 { my ($self, $attrs, $text) = @_; $text =~ s/\s+$//; local $Term::ANSIColor::EACHLINE = "\n"; $self->SUPER::cmd_head1 ($attrs, colored ($text, 'bold')); } # Make level two headings bold. sub cmd_head2 { my ($self, $attrs, $text) = @_; $text =~ s/\s+$//; $self->SUPER::cmd_head2 ($attrs, colored ($text, 'bold')); } # Fix the various formatting codes. sub cmd_b { return colored ($_[2], 'bold') } sub cmd_f { return colored ($_[2], 'cyan') } sub cmd_i { return colored ($_[2], 'yellow') } # Analyze a single line and return any formatting codes in effect at the end # of that line. sub end_format { my ($self, $line) = @_; my $reset = color ('reset'); my $current; while ($line =~ /(\e\[[\d;]+m)/g) { my $code = $1; if ($code eq $reset) { undef $current; } else { $current .= $code; } } return $current; } # Output any included code in green. sub output_code { my ($self, $code) = @_; local $Term::ANSIColor::EACHLINE = "\n"; $code = colored ($code, 'green'); $self->output ($code); } # Strip all of the formatting from a provided string, returning the stripped # version. We will eventually want to use colorstrip() from Term::ANSIColor, # but it's fairly new so avoid the tight dependency. sub strip_format { my ($self, $text) = @_; $text =~ s/\e\[[\d;]*m//g; return $text; } # We unfortunately have to override the wrapping code here, since the normal # wrapping code gets really confused by all the escape sequences. sub wrap { my $self = shift; local $_ = shift; my $output = ''; my $spaces = ' ' x $$self{MARGIN}; my $width = $$self{opt_width} - $$self{MARGIN}; # $codes matches a single special sequence. $char matches any number of # special sequences preceding a single character other than a newline. # $shortchar matches some sequence of $char ending in codes followed by # whitespace or the end of the string. $longchar matches exactly $width # $chars, used when we have to truncate and hard wrap. # # $shortchar and $longchar are created in a slightly odd way because the # construct ${char}{0,$width} didn't do the right thing until Perl 5.8.x. my $code = '(?:\e\[[\d;]+m)'; my $char = "(?>$code*[^\\n])"; my $shortchar = '^(' . $char . "{0,$width}(?>$code*)" . ')(?:\s+|\z)'; my $longchar = '^(' . $char . "{$width})"; while (length > $width) { if (s/$shortchar// || s/$longchar//) { $output .= $spaces . $1 . "\n"; } else { last; } } $output .= $spaces . $_; # less -R always resets terminal attributes at the end of each line, so we # need to clear attributes at the end of lines and then set them again at # the start of the next line. This requires a second pass through the # wrapped string, accumulating any attributes we see, remembering them, # and then inserting the appropriate sequences at the newline. if ($output =~ /\n/) { my @lines = split (/\n/, $output); my $start_format; for my $line (@lines) { if ($start_format && $line =~ /\S/) { $line =~ s/^(\s*)(\S)/$1$start_format$2/; } $start_format = $self->end_format ($line); if ($start_format) { $line .= color ('reset'); } } $output = join ("\n", @lines); } # Fix up trailing whitespace and return the results. $output =~ s/\s+$/\n\n/; $output; } ############################################################################## # Module return value and documentation ############################################################################## 1; __END__ =for stopwords Allbery =head1 NAME Pod::Text::Color - Convert POD data to formatted color ASCII text =head1 SYNOPSIS use Pod::Text::Color; my $parser = Pod::Text::Color->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::Color is a simple subclass of Pod::Text that highlights output text using ANSI color escape sequences. Apart from the color, it in all ways functions like Pod::Text. See L for details and available options. Term::ANSIColor is used to get colors and therefore must be installed to use this module. =head1 BUGS This is just a basic proof of concept. It should be seriously expanded to support configurable coloration via options passed to the constructor, and B should be taught about those. =head1 AUTHOR Russ Allbery . =head1 COPYRIGHT AND LICENSE Copyright 1999, 2001, 2004, 2006, 2008, 2009, 2018 Russ Allbery This program is free software; you may redistribute it and/or modify it under the same terms as Perl itself. =head1 SEE ALSO L, L The current version of this module is always available from its web site at L. It is also part of the Perl core distribution as of 5.6.0. =cut # Local Variables: # copyright-at-end-flag: t # End: