lei: MH: support inotify to detect updates

This should help us deal with MH sequence number packing and
invalidating mail_sync.sqlite3.

1 files changed, 20 insertions, 2 deletions

diff --git a/lib/PublicInbox/LeiNoteEvent.pm b/lib/PublicInbox/LeiNoteEvent.pm
index 8581bd9a..8d900d0c 100644
--- a/lib/PublicInbox/LeiNoteEvent.pm
+++ b/lib/PublicInbox/LeiNoteEvent.pm
@@ -60,6 +60,18 @@ sub maildir_event { # via wq_nonblock_do
         } # else: eml_from_path already warns
 }
 
+sub _mh_cb { # mh_read_one cb
+        my ($dir, $bn, $kw, $eml, $self, $state) = @_;
+}
+
+sub mh_event { # via wq_nonblock_do
+        my ($self, $folder, $bn, $state) = @_;
+        my $dir = substr($folder, 3);
+        require PublicInbox::MHreader; # if we forked early
+        my $mhr = PublicInbox::MHreader->new($dir, $self->{lei}->{3});
+        $mhr->mh_read_one($bn, \&_mh_cb, $self, $state);
+}
+
 sub lei_note_event {
         my ($lei, $folder, $new_cur, $bn, $fn, @rest) = @_;
         die "BUG: unexpected: @rest" if @rest;
@@ -72,11 +84,14 @@ sub lei_note_event {
         $lms->arg2folder($lei, [ $folder ]);
         my $state = $cfg->get_1("watch.$folder.state") // 'tag-rw';
         return if $state eq 'pause';
-        return $lms->clear_src($folder, \$bn) if $new_cur eq '';
+        if ($new_cur eq '') {
+                my $id = $folder =~ /\Amaildir:/ ? \$bn : $bn + 0;
+                return $lms->clear_src($folder, $id);
+        }
         $lms->lms_pause;
         $lei->ale; # prepare
         $sto->write_prepare($lei);
-        require PublicInbox::MdirReader;
+        require PublicInbox::MHreader if $folder =~ /\Amh:/; # optimistic
         my $self = $cfg->{-lei_note_event} //= do {
                 my $wq = bless { lms => $lms }, __PACKAGE__;
                 # MUAs such as mutt can trigger massive rename() storms so
@@ -91,12 +106,15 @@ sub lei_note_event {
                 $lei->{lne} = $wq;
         };
         if ($folder =~ /\Amaildir:/i) {
+                require PublicInbox::MdirReader;
                 my $fl = PublicInbox::MdirReader::maildir_basename_flags($bn)
                         // return;
                 return if index($fl, 'T') >= 0;
                 my $kw = PublicInbox::MdirReader::flags2kw($fl);
                 my $vmd = { kw => $kw, sync_info => [ $folder, \$bn ] };
                 $self->wq_nonblock_do('maildir_event', $fn, $vmd, $state);
+        } elsif ($folder =~ /\Amh:/) {
+                $self->wq_nonblock_do('mh_event', $folder, $bn, $state);
         } # else: TODO: imap
 }