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lib/AnyEvent/Sway.pm  view on Meta::CPAN

        return $cv->send(0) unless $fh;

        $self->{ipchdl} = AnyEvent::Handle->new(
            fh => $fh,
            on_read => sub { my ($hdl) = @_; $self->_data_available($hdl) },
            on_error => sub {
                my ($hdl, $fatal, $msg) = @_;
                delete $self->{ipchdl};
                $hdl->destroy;

                my $cb = $self->{callbacks};

                # Trigger all one-time callbacks with undef
                for my $type (keys %{$cb}) {
                    next if ($type & $event_mask) == $event_mask;
                    $cb->{$type}->();
                    delete $cb->{$type};
                }

                # Trigger _error callback, if set
                my $type = $events{_error};
                return unless defined($cb->{$type});
                $cb->{$type}->($msg);

lib/AnyEvent/Sway.pm  view on Meta::CPAN

                sub { $self->_handle_sway_message($type, $_[1]) }
            );
        }
    );
}

sub _handle_sway_message
{
    my ($self, $type, $payload) = @_;

    return unless defined($self->{callbacks}->{$type});

    my $cb = $self->{callbacks}->{$type};
    $cb->(decode_json $payload);

    return if ($type & $event_mask) == $event_mask;

    # If this was a one-time callback, we delete it
    # (when connection is lost, all one-time callbacks get triggered)
    delete $self->{callbacks}->{$type};
}

=head2 $sway->subscribe(\%callbacks)

Subscribes to the given event types. This function awaits a hashref with the
key being the name of the event and the value being a callback.

    my %callbacks = (
        workspace => sub { say "Workspaces changed" }
    );

    if ($sway->subscribe(\%callbacks)->recv->{success}) {
        say "Successfully subscribed";
    }

The special callback with name C<_error> is called when the connection to Sway
is killed (because of a crash, exit or restart of Sway most likely). You can
use it to print an appropriate message and exit cleanly or to try to reconnect.

    my %callbacks = (
        _error => sub {
            my ($msg) = @_;
            say "I am sorry. I am so sorry: $msg";
            exit 1;
        }
    );

    $sway->subscribe(\%callbacks)->recv;

=cut
sub subscribe
{
    my ($self, $callbacks) = @_;

    # Register callbacks for each message type
    for my $key (keys %{$callbacks}) {
        my $type = $events{$key};
        $self->{callbacks}->{$type} = $callbacks->{$key};
    }

    $self->message(TYPE_SUBSCRIBE, [ keys %{$callbacks} ])
}

=head2 $sway->message($type, $content)

Sends a message of the specified C<type> to Sway, possibly containing the data
structure C<content> (or C<content>, encoded as utf8, if C<content> is a
scalar), if specified.

    my $reply = $sway->message(TYPE_RUN_COMMAND, "reload")->recv;
    if ($reply->{success}) {

lib/AnyEvent/Sway.pm  view on Meta::CPAN

            $payload = encode_json $content;
        }
    }
    my $message = $magic . pack("LL", length($payload), $type) . $payload;
    $self->{ipchdl}->push_write($message);

    my $cv = AnyEvent->condvar;

    # We don’t preserve the old callback as it makes no sense to
    # have a callback on message reply types (only on events)
    $self->{callbacks}->{$type} =
        sub {
            my ($reply) = @_;
            $cv->send($reply);
            undef $self->{callbacks}->{$type};
        };

    $cv
}

=head1 SUGAR METHODS

These methods intend to make your scripts as beautiful as possible. All of
them automatically establish a connection to Sway blockingly (if it does not
already exist).