The error message is pretty descriptive. You are calling ->recv from within a handler. Don't do that.
The following should work:
sub handle {
my($data)=@_;
if($data->{change} eq "empty") {
print "empty workspace!!\n";
my $switched; $switched = $i3->command("workspace 1")->cb(sub {
print "Switched back to workspace 1\n";
undef $switched;
});
}
}
Using AnyEvent, you should basically never call ->recv and only use callbacks except in the outermost program.
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