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Edit File : Color.pm \| Size : 6.06 KB
# Convert POD data to formatted color ASCII text # # This is just a basic proof of concept. 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<Pod::Text> 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<pod2text> should be taught about those. =head1 AUTHOR Russ Allbery <rra@cpan.org>. =head1 COPYRIGHT AND LICENSE Copyright 1999, 2001, 2004, 2006, 2008, 2009, 2018 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: Back

Edit File : Color.pm | Size : 6.06 KB

# Convert POD data to formatted color ASCII text
#
# This is just a basic proof of concept.  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<Pod::Text> 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<pod2text> should be taught about those.

=head1 AUTHOR

Russ Allbery <rra@cpan.org>.

=head1 COPYRIGHT AND LICENSE

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:

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