extindex: add undocumented --no-scan switch

This makes diagnosing --watch problems easier when there's
50K inboxes by avoiding the lengthy scan (which is the reason
--watch exists in the first place).

1 files changed, 5 insertions, 3 deletions

diff --git a/lib/PublicInbox/ExtSearchIdx.pm b/lib/PublicInbox/ExtSearchIdx.pm
index 778154a5..07e64698 100644
--- a/lib/PublicInbox/ExtSearchIdx.pm
+++ b/lib/PublicInbox/ExtSearchIdx.pm
@@ -881,9 +881,11 @@ sub eidx_sync { # main entry point
         }
 
         # don't use $_ here, it'll get clobbered by reindex_checkpoint
-        for my $ibx (@{$self->{ibx_list}}) {
-                last if $sync->{quit};
-                sync_inbox($self, $sync, $ibx);
+        if ($opt->{scan} // 1) {
+                for my $ibx (@{$self->{ibx_list}}) {
+                        last if $sync->{quit};
+                        sync_inbox($self, $sync, $ibx);
+                }
         }
         $self->{oidx}->rethread_done($opt) unless $sync->{quit};
         eidxq_process($self, $sync) unless $sync->{quit};