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|
package App::REPL;
use strict;
use warnings;
use Module::Runtime qw(compose_module_name use_package_optimistically);
use Scalar::Util qw(blessed);
use Try::Tiny;
sub new {
my $class = shift;
my %opts = @_;
require App::REPL::Plugin::Defaults;
my $self = bless {
plugins => [],
_default_plugin => App::REPL::Plugin::Defaults->new,
}, $class;
my @plugins;
my $postlude;
if (exists $opts{script}) {
my $script = do {
open my $fh, '<', $opts{script}
or die "Can't open $opts{script}: $!";
local $/ = undef;
<$fh>
};
local *main::load_plugin = sub {
push @plugins, @_;
};
local *main::postlude = sub {
$postlude .= $_[0];
};
print "Loading configuration from $opts{script}... ";
$self->_eval($script);
print "done\n";
}
$self->load_plugin($_) for @{ $opts{plugins} || [] }, @plugins;
if (defined $postlude) {
$self->_eval($postlude);
}
return $self;
}
sub load_plugin {
my $self = shift;
my ($plugin) = @_;
if (!blessed($plugin)) {
$plugin = compose_module_name("App::REPL::Plugin", $plugin);
use_package_optimistically($plugin);
die "$plugin is not a valid plugin"
unless $plugin->isa("App::REPL::Plugin");
$plugin = $plugin->new;
}
push @{ $self->{plugins} }, $plugin;
}
sub plugins {
my $self = shift;
return (
@{ $self->{plugins} },
$self->{_default_plugin},
);
}
sub run {
my $self = shift;
while (defined(my $line = $self->_read)) {
try {
my @result = $self->_eval($line);
$self->_print_result(@result);
}
catch {
$self->_print_error($_);
}
}
print "\n";
}
sub _read {
my $self = shift;
$self->_wrapped_plugin('display_prompt');
my ($line) = $self->_wrapped_plugin('read_line');
return $line;
}
sub _eval {
my $self = shift;
my ($line) = @_;
($line) = $self->_chained_plugin('mangle_line', $line)
if defined $line;
return $self->_wrapped_plugin('evaluate', $line);
}
sub _print_error {
my $self = shift;
my ($error) = @_;
($error) = $self->_chained_plugin('mangle_error', $error);
$self->_wrapped_plugin('print_error', $error);
}
sub _print_result {
my $self = shift;
my (@result) = @_;
@result = $self->_chained_plugin('mangle_result', @result);
$self->_wrapped_plugin('print_result', @result);
}
sub _wrapped_plugin {
my $self = shift;
my @plugins = ref($_[0]) ? @{ shift() } : $self->plugins;
my ($method, @args) = @_;
@plugins = grep { $_->can($method) } @plugins;
return @args unless @plugins;
my $plugin = shift @plugins;
my $next = sub { $self->_wrapped_plugin(\@plugins, $method, @_) };
return $plugin->$method($next, @args);
}
sub _chained_plugin {
my $self = shift;
my @plugins = ref($_[0]) ? @{ shift() } : $self->plugins;
my ($method, @args) = @_;
@plugins = grep { $_->can($method) } @plugins;
for my $plugin (@plugins) {
@args = $plugin->$method(@args);
}
return @args;
}
1;
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