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# Copyright 2008, 2009, 2010, 2013, 2015 Kevin Ryde
# HTML-FormatExternal is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License as published
# by the Free Software Foundation; either version 3, or (at your option) any
# later version.
#
# HTML-FormatExternal is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
# or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
# for more details.
#
# You should have received a copy of the GNU General Public License along
# with HTML-FormatExternal. If not, see <http://www.gnu.org/licenses/>.
package HTML::FormatText::Zen;
use 5.006;
use strict;
use warnings;
use HTML::FormatExternal;
our @ISA = ('HTML::FormatExternal');
our $VERSION = 26;
use constant DEFAULT_LEFTMARGIN => 0;
use constant DEFAULT_RIGHTMARGIN => 80;
# no input charset options
use constant _WIDE_INPUT_CHARSET => 'entitize';
sub program_full_version {
my ($self_or_class) = @_;
return $self_or_class->_run_version (['zen', '--version']);
}
sub program_version {
my ($self_or_class) = @_;
my $version = $self_or_class->program_full_version;
if (! defined $version) { return undef; }
# eg. "zen version 0.2.3"
$version =~ /^zen version (.*)/i
or $version =~ /^(.*)/; # whole first line if format not recognised
return $1 . substr($version,0,0); # retain taintedness
}
sub _make_run {
my ($class, $input_filename, $options) = @_;
# Is it worth enforcing/checking this ?
# Could use Encode.pm to convert the output without too much trouble.
#
# if (my $input_charset = $options->{'input_charset'}) {
# $input_charset =~ /^latin-?1$|^iso-?8859-1$/i
# or croak "Zen only accepts latin-1 input";
# }
# if (my $output_charset = $options->{'output_charset'}) {
# $output_charset =~ /^latin-?1$|^iso-?8859-1$/i
# or croak "Zen only produces latin-1 output";
# }
# 'zen_options' not documented ...
return ([ 'zen', '-i', 'dump',
@{$options->{'zen_options'} || []},
'--', # end of options
$input_filename,
]);
}
1;
__END__
=for stopwords HTML-FormatExternal formatters charset latin-1 Ryde
=head1 NAME
HTML::FormatText::Zen - format HTML as plain text using zen
=for test_synopsis my ($text, $filename, $html_string, $formatter, $tree)
=head1 SYNOPSIS
use HTML::FormatText::Zen;
$text = HTML::FormatText::Zen->format_file ($filename);
$text = HTML::FormatText::Zen->format_string ($html_string);
$formatter = HTML::FormatText::Zen->new;
$tree = HTML::TreeBuilder->new_from_file ($filename);
$text = $formatter->format ($tree);
=head1 DESCRIPTION
C<HTML::FormatText::Zen> turns HTML into plain text using the C<zen>
program.
=over 4
L<http://www.nocrew.org/software/zen/>
=back
The module interface is compatible with formatters like C<HTML::FormatText>,
but all parsing etc is done by zen.
See C<HTML::FormatExternal> for the formatting functions. The margins
options work but nothing else.
=over
=item C<rightmargin>
As of zen version 0.2.3 there is no right margin option.
=item C<input_charset>, C<output_charset>
As of zen version 0.2.3 the input charset is always latin-1 and output is
always latin-1. Entities in the input seem to be truncated to 8-bits for
the output.
=back
=head1 SEE ALSO
L<HTML::FormatExternal>, L<zen(1)>
=head1 HOME PAGE
L<http://user42.tuxfamily.org/html-formatexternal/index.html>
=head1 LICENSE
Copyright 2008, 2009, 2010, 2013, 2015 Kevin Ryde
HTML-FormatExternal is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 3, or (at your option) any later
version.
HTML-FormatExternal is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
more details.
You should have received a copy of the GNU General Public License along with
HTML-FormatExternal. If not, see L<http://www.gnu.org/licenses/>.
=cut
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