2 # vim:ts=4:sw=4:expandtab
14 AnyEvent::I3 - communicate with the i3 window manager
18 our $VERSION = '0.09';
26 This module connects to the i3 window manager using the UNIX socket based
27 IPC interface it provides (if enabled in the configuration file). You can
28 then subscribe to events or send messages and receive their replies.
30 use AnyEvent::I3 qw(:all);
32 my $i3 = i3("~/.i3/ipc.sock");
34 $i3->connect->recv or die "Error connecting";
35 say "Connected to i3";
37 my $workspaces = $i3->message(TYPE_GET_WORKSPACES)->recv;
38 say "Currently, you use " . @{$workspaces} . " workspaces";
40 ...or, using the sugar methods:
44 my $workspaces = i3->get_workspaces->recv;
45 say "Currently, you use " . @{$workspaces} . " workspaces";
49 =head2 $i3 = i3([ $path ]);
51 Creates a new C<AnyEvent::I3> object and returns it. C<path> is the path of
52 the UNIX socket to connect to.
54 =head1 SUBROUTINES/METHODS
58 use Exporter qw(import);
63 use constant TYPE_COMMAND => 0;
64 use constant TYPE_GET_WORKSPACES => 1;
65 use constant TYPE_SUBSCRIBE => 2;
66 use constant TYPE_GET_OUTPUTS => 3;
67 use constant TYPE_GET_TREE => 4;
68 use constant TYPE_GET_MARKS => 5;
69 use constant TYPE_GET_BAR_CONFIG => 6;
71 our %EXPORT_TAGS = ( 'all' => [
72 qw(i3 TYPE_COMMAND TYPE_GET_WORKSPACES TYPE_SUBSCRIBE TYPE_GET_OUTPUTS
73 TYPE_GET_TREE TYPE_GET_MARKS TYPE_GET_BAR_CONFIG)
76 our @EXPORT_OK = ( @{ $EXPORT_TAGS{all} } );
80 # TODO: auto-generate this from the header file? (i3/ipc.h)
81 my $event_mask = (1 << 31);
83 workspace => ($event_mask | 0),
84 output => ($event_mask | 1),
92 =head2 $i3 = AnyEvent::I3->new([ $path ])
94 Creates a new C<AnyEvent::I3> object and returns it. C<path> is the path of
95 the UNIX socket to connect to.
99 my ($class, $path) = @_;
101 $path ||= '~/.i3/ipc.sock';
103 # Check if we need to resolve ~
105 # We use getpwuid() instead of $ENV{HOME} because the latter is tainted
106 # and thus produces warnings when running tests with perl -T
107 my $home = (getpwuid($<))[7];
108 die "Could not get home directory" unless $home and -d $home;
109 $path =~ s/~/$home/g;
112 bless { path => $path } => $class;
117 Establishes the connection to i3. Returns an C<AnyEvent::CondVar> which will
118 be triggered with a boolean (true if the connection was established) as soon as
119 the connection has been established.
121 if ($i3->connect->recv) {
122 say "Connected to i3";
128 my $cv = AnyEvent->condvar;
130 tcp_connect "unix/", $self->{path}, sub {
133 return $cv->send(0) unless $fh;
135 $self->{ipchdl} = AnyEvent::Handle->new(
137 on_read => sub { my ($hdl) = @_; $self->_data_available($hdl) },
139 my ($hdl, $fatal, $msg) = @_;
140 delete $self->{ipchdl};
143 my $cb = $self->{callbacks};
145 # Trigger all one-time callbacks with undef
146 for my $type (keys %{$cb}) {
147 next if ($type & $event_mask) == $event_mask;
152 # Trigger _error callback, if set
153 my $type = $events{_error};
154 return unless defined($cb->{$type});
155 $cb->{$type}->($msg);
165 sub _data_available {
166 my ($self, $hdl) = @_;
169 chunk => length($magic) + 4 + 4,
172 # Unpack message length and read the payload
173 my ($len, $type) = unpack("LL", substr($header, length($magic)));
176 sub { $self->_handle_i3_message($type, $_[1]) }
182 sub _handle_i3_message {
183 my ($self, $type, $payload) = @_;
185 return unless defined($self->{callbacks}->{$type});
187 my $cb = $self->{callbacks}->{$type};
188 $cb->(decode_json $payload);
190 return if ($type & $event_mask) == $event_mask;
192 # If this was a one-time callback, we delete it
193 # (when connection is lost, all one-time callbacks get triggered)
194 delete $self->{callbacks}->{$type};
197 =head2 $i3->subscribe(\%callbacks)
199 Subscribes to the given event types. This function awaits a hashref with the
200 key being the name of the event and the value being a callback.
203 workspace => sub { say "Workspaces changed" }
206 if ($i3->subscribe(\%callbacks)->recv->{success})
207 say "Successfully subscribed";
210 The special callback with name C<_error> is called when the connection to i3
211 is killed (because of a crash, exit or restart of i3 most likely). You can
212 use it to print an appropriate message and exit cleanly or to try to reconnect.
217 say "I am sorry. I am so sorry: $msg";
222 $i3->subscribe(\%callbacks)->recv;
226 my ($self, $callbacks) = @_;
228 # Register callbacks for each message type
229 for my $key (keys %{$callbacks}) {
230 my $type = $events{$key};
231 $self->{callbacks}->{$type} = $callbacks->{$key};
234 $self->message(TYPE_SUBSCRIBE, [ keys %{$callbacks} ])
237 =head2 $i3->message($type, $content)
239 Sends a message of the specified C<type> to i3, possibly containing the data
240 structure C<content> (or C<content>, encoded as utf8, if C<content> is a
241 scalar), if specified.
243 my $reply = $i3->message(TYPE_COMMAND, "reload")->recv;
244 if ($reply->{success}) {
245 say "Configuration successfully reloaded";
250 my ($self, $type, $content) = @_;
252 die "No message type specified" unless defined($type);
254 die "No connection to i3" unless defined($self->{ipchdl});
258 if (not ref($content)) {
259 # Convert from Perl’s internal encoding to UTF8 octets
260 $payload = encode_utf8($content);
262 $payload = encode_json $content;
265 my $message = $magic . pack("LL", length($payload), $type) . $payload;
266 $self->{ipchdl}->push_write($message);
268 my $cv = AnyEvent->condvar;
270 # We don’t preserve the old callback as it makes no sense to
271 # have a callback on message reply types (only on events)
272 $self->{callbacks}->{$type} =
276 undef $self->{callbacks}->{$type};
284 These methods intend to make your scripts as beautiful as possible. All of
285 them automatically establish a connection to i3 blockingly (if it does not
290 sub _ensure_connection {
293 return if defined($self->{ipchdl});
295 $self->connect->recv or die "Unable to connect to i3"
298 =head2 get_workspaces
300 Gets the current workspaces from i3.
302 my $ws = i3->get_workspaces->recv;
309 $self->_ensure_connection;
311 $self->message(TYPE_GET_WORKSPACES)
316 Gets the current outputs from i3.
318 my $outs = i3->get_outputs->recv;
325 $self->_ensure_connection;
327 $self->message(TYPE_GET_OUTPUTS)
332 Gets the layout tree from i3 (>= v4.0).
334 my $tree = i3->get_tree->recv;
341 $self->_ensure_connection;
343 $self->message(TYPE_GET_TREE)
348 Gets all the window identifier marks from i3 (>= v4.1).
350 my $marks = i3->get_marks->recv;
357 $self->_ensure_connection;
359 $self->message(TYPE_GET_MARKS)
362 =head2 get_bar_config
364 Gets the bar configuration for the specific bar id from i3 (>= v4.1).
366 my $config = i3->get_bar_config($id)->recv;
371 my ($self, $id) = @_;
373 $self->_ensure_connection;
375 $self->message(TYPE_GET_BAR_CONFIG, $id)
378 =head2 command($content)
380 Makes i3 execute the given command
382 my $reply = i3->command("reload")->recv;
383 die "command failed" unless $reply->{success};
387 my ($self, $content) = @_;
389 $self->_ensure_connection;
391 $self->message(TYPE_COMMAND, $content)
396 Michael Stapelberg, C<< <michael at stapelberg.de> >>
400 Please report any bugs or feature requests to C<bug-anyevent-i3 at
401 rt.cpan.org>, or through the web interface at
402 L<http://rt.cpan.org/NoAuth/ReportBug.html?Queue=AnyEvent-I3>. I will be
403 notified, and then you'll automatically be notified of progress on your bug as
408 You can find documentation for this module with the perldoc command.
412 You can also look for information at:
416 =item * RT: CPAN's request tracker
418 L<http://rt.cpan.org/NoAuth/Bugs.html?Dist=AnyEvent-I3>
420 =item * The i3 window manager website
422 L<http://i3.zekjur.net/>
427 =head1 ACKNOWLEDGEMENTS
430 =head1 LICENSE AND COPYRIGHT
432 Copyright 2010 Michael Stapelberg.
434 This program is free software; you can redistribute it and/or modify it
435 under the terms of either: the GNU General Public License as published
436 by the Free Software Foundation; or the Artistic License.
438 See http://dev.perl.org/licenses/ for more information.
443 1; # End of AnyEvent::I3