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76 lines
1.5 KiB
76 lines
1.5 KiB
package App::WRT::Filters;
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use strict;
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use warnings;
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use 5.10.0;
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use open ':std', ':encoding(UTF-8)';
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use Carp;
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use Encode qw(decode encode);
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use IPC::Cmd qw(can_run run_forked);
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=pod
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=head1 NAME
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App::WRT::Filters - Apply filters to markup
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An experimental feature.
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=head1 SYNOPSIS
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# Where $entry is the path to an entry and $markup is its content:
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my $filters = App::WRT::Filters->new($filter_dir);
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my @filter_list = qw(toc);
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$filters->dispatch($entry, $markup, @filter_list);
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=cut
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sub new {
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my $class = shift;
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my ($filter_dir) = @_;
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my %params = ( filter_dir => $filter_dir );
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my $self = \%params;
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bless $self, $class;
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return $self;
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}
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sub dispatch {
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my $self = shift;
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my ($entry, $markup, @filters) = @_;
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for my $filter (@filters)
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{
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my $new_markup = '';
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my $stderr = '';
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my $command = $self->resolve_filter($filter);
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local $ENV{'WRT_ENTRY'} = $entry;
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my $result = run_forked($command, {
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# The encode() here seems necessary to avoid "Wide character in print"
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# errors from IPC::Cmd:
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child_stdin => encode('UTF-8', $markup),
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timeout => 300,
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stdout_handler => sub { $new_markup .= decode('UTF-8', $_[0]); },
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stderr_handler => sub { $stderr .= decode('UTF-8', $_[0]); }
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});
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if (length $stderr) {
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carp($stderr);
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}
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$markup = $new_markup;
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}
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return $markup;
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}
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sub resolve_filter {
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my ($self, $filter) = @_;
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return $self->{filter_dir} . '/' . $filter;
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}
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1;
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