1 files changed, 62 insertions, 0 deletions
diff --git a/lib/IM/Engine/Plugin/Commands/Trait/Attribute/Command.pm b/lib/IM/Engine/Plugin/Commands/Trait/Attribute/Command.pm
new file mode 100644
index 0000000..bd345dd
--- /dev/null
+++ b/lib/IM/Engine/Plugin/Commands/Trait/Attribute/Command.pm
@@ -0,0 +1,62 @@
+package IM::Engine::Plugin::Commands::Trait::Attribute::Command;
+use Moose::Role;
+
+has command => (
+    is      => 'rw',
+    isa     => 'Bool',
+    default => 0,
+);
+
+has needs_init => (
+    is      => 'rw',
+    isa     => 'Bool',
+    default => 1,
+);
+
+has _use_accessor_metatrait => (
+    is      => 'rw',
+    isa     => 'Bool',
+    default => 0,
+);
+
+before _process_options => sub {
+    my $self = shift;
+    my ($name, $options) = @_;
+    Carp::cluck("needs_init is useless for attributes without command")
+        if exists($options->{needs_init}) && !$options->{command};
+};
+
+around accessor_metaclass => sub {
+    my $orig = shift;
+    my $self = shift;
+    my $metaclass = $self->$orig(@_);
+    return $metaclass unless $self->command && $self->_use_accessor_metatrait;
+    return Moose::Meta::Class->create_anon_class(
+        superclasses => [$metaclass],
+        roles        => ['IM::Engine::Plugin::Commands::Trait::Method::Command'],
+        cache        => 1,
+    )->name;
+};
+
+after install_accessors => sub {
+    my $self = shift;
+    return unless $self->command;
+    my $method_meta = $self->get_read_method_ref;
+    $method_meta->pass_args(0);
+    $method_meta->needs_init($self->needs_init);
+};
+
+around _process_accessors => sub {
+    my $orig = shift;
+    my $self = shift;
+    my ($type) = @_;
+    $self->_use_accessor_metatrait(1) if $type eq 'accessor'
+                                      || $type eq 'reader';
+    my @ret = $self->$orig(@_);
+    $self->_use_accessor_metatrait(0);
+    return @ret;
+};
+
+no Moose::Role;
+
+1;