watch: remove Filesys::Notify::Simple dependency

Since we already use inotify and EVFILT_VNODE (kqueue)
in -imapd, we might as well use them directly in -watch,
too.

This will allow public-inbox-watch to use PublicInbox::DS
for timers to watch newsgroups/mailboxes and have saner
signal handling in future commits.

1 files changed, 13 insertions, 0 deletions

diff --git a/lib/PublicInbox/In2Tie.pm b/lib/PublicInbox/In2Tie.pm
index db1dc104..7dee3627 100644
--- a/lib/PublicInbox/In2Tie.pm
+++ b/lib/PublicInbox/In2Tie.pm
@@ -5,6 +5,19 @@
 # on Linux::Inotify2 objects
 package PublicInbox::In2Tie;
 use strict;
+use Symbol qw(gensym);
+
+sub io {
+        my $in2 = $_[0];
+        $in2->blocking(0);
+        if ($in2->can('on_overflow')) {
+                # broadcasts everything on overflow
+                $in2->on_overflow(undef);
+        }
+        my $io = gensym;
+        tie *$io, __PACKAGE__, $in2;
+        $io;
+}
 
 sub TIEHANDLE {
         my ($class, $in2) = @_;