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package Reply::Plugin::ResultCache;
use strict;
use warnings;
# ABSTRACT: retain previous results to be able to refer to them later
use base 'Reply::Plugin';
=head1 SYNOPSIS
; .replyrc
[ResultCache]
variable = r
=head1 DESCRIPTION
This plugin caches the results of successful evaluations, and provides them in
a lexical array (by default C<@res>, although this can be changed via the
C<variable> option). This means that you can, for instance, access the value
returned by the previous line with C<$res[-1]>. It also modifies the output to
include an indication of where the value is stored, for later reference.
=cut
sub new {
my $class = shift;
my %opts = @_;
my $self = $class->SUPER::new(@_);
$self->{results} = [];
$self->{result_name} = $opts{variable} || 'res';
return $self;
}
sub execute {
my $self = shift;
my ($next, @args) = @_;
my @res = $next->(@args);
if (@res == 1) {
push @{ $self->{results} }, $res[0];
}
elsif (@res > 1) {
push @{ $self->{results} }, \@res;
}
return @res;
}
sub mangle_result {
my $self = shift;
my ($result) = @_;
return unless defined $result;
return '$' . $self->{result_name} . '[' . $#{ $self->{results} } . '] = '
. $result;
}
sub lexical_environment {
my $self = shift;
return { "\@$self->{result_name}" => [ @{ $self->{results} } ] };
}
1;
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