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-rw-r--r--lib/PublicInbox/Mbox.pm2
-rw-r--r--lib/PublicInbox/Search.pm10
-rw-r--r--lib/PublicInbox/SearchIdx.pm16
-rw-r--r--lib/PublicInbox/SearchView.pm21
-rw-r--r--lib/PublicInbox/V2Writable.pm12
5 files changed, 50 insertions, 11 deletions
diff --git a/lib/PublicInbox/Mbox.pm b/lib/PublicInbox/Mbox.pm
index c9b11c21..0223bead 100644
--- a/lib/PublicInbox/Mbox.pm
+++ b/lib/PublicInbox/Mbox.pm
@@ -262,7 +262,7 @@ sub mbox_all {
         $ctx->{ids} = $srch->mset_to_artnums($mset);
         require PublicInbox::MboxGz;
         my $fn;
-        if ($q->{t}) {
+        if ($q->{t} && $srch->has_threadid) {
                 $fn = 'results-thread-'.$q_string;
                 PublicInbox::MboxGz::mbox_gz($ctx, \&results_thread_cb, $fn);
         } else {
diff --git a/lib/PublicInbox/Search.pm b/lib/PublicInbox/Search.pm
index bc820b64..01bbe73d 100644
--- a/lib/PublicInbox/Search.pm
+++ b/lib/PublicInbox/Search.pm
@@ -311,6 +311,12 @@ sub _do_enquire {
         retry_reopen($self, \&_enquire_once, [ $self, $query, $opts ]);
 }
 
+# returns true if all docs have the THREADID value
+sub has_threadid ($) {
+        my ($self) = @_;
+        (xdb($self)->get_metadata('has_threadid') // '') eq '1';
+}
+
 sub _enquire_once { # retry_reopen callback
         my ($self, $query, $opts) = @{$_[0]};
         my $xdb = xdb($self);
@@ -328,7 +334,9 @@ sub _enquire_once { # retry_reopen callback
         }
 
         # `mairix -t / --threads' or JMAP collapseThreads
-        $enquire->set_collapse_key(THREADID) if $opts->{thread};
+        if ($opts->{thread} && has_threadid($self)) {
+                $enquire->set_collapse_key(THREADID);
+        }
 
         my $offset = $opts->{offset} || 0;
         my $limit = $opts->{limit} || 50;
diff --git a/lib/PublicInbox/SearchIdx.pm b/lib/PublicInbox/SearchIdx.pm
index baa6f41a..ade55756 100644
--- a/lib/PublicInbox/SearchIdx.pm
+++ b/lib/PublicInbox/SearchIdx.pm
@@ -131,6 +131,7 @@ sub idx_acquire {
                                 ($is_shard && need_xapian($self)))) {
                         File::Path::mkpath($dir);
                         nodatacow_dir($dir);
+                        $self->{-set_has_threadid_once} = 1;
                 }
         }
         return unless defined $flag;
@@ -590,9 +591,17 @@ sub v1_checkpoint ($$;$) {
 
         $self->{mm}->{dbh}->commit;
         if ($newest && need_xapian($self)) {
-                my $cur = $self->{xdb}->get_metadata('last_commit');
+                my $xdb = $self->{xdb};
+                my $cur = $xdb->get_metadata('last_commit');
                 if (need_update($self, $cur, $newest)) {
-                        $self->{xdb}->set_metadata('last_commit', $newest);
+                        $xdb->set_metadata('last_commit', $newest);
+                }
+
+                # let SearchView know a full --reindex was done so it can
+                # generate ->has_threadid-dependent links
+                if ($sync->{reindex} && !ref($sync->{reindex})) {
+                        my $n = $xdb->get_metadata('has_threadid');
+                        $xdb->set_metadata('has_threadid', '1') if $n ne '1';
                 }
         }
 
@@ -816,6 +825,9 @@ sub set_metadata_once {
         return if $self->{shard}; # only continue if undef or 0, not >0
         my $xdb = $self->{xdb};
 
+        if (delete($self->{-set_has_threadid_once})) {
+                $xdb->set_metadata('has_threadid', '1');
+        }
         if (delete($self->{-set_indexlevel_once})) {
                 my $level = $xdb->get_metadata('indexlevel');
                 if (!$level || $level ne 'medium') {
diff --git a/lib/PublicInbox/SearchView.pm b/lib/PublicInbox/SearchView.pm
index dd69564a..76428dfb 100644
--- a/lib/PublicInbox/SearchView.pm
+++ b/lib/PublicInbox/SearchView.pm
@@ -188,13 +188,20 @@ sub search_nav_top {
                 $rv .= qq{<a\nhref="?$s">summary</a>|<b>nested</b>};
         }
         my $A = $q->qs_html(x => 'A', r => undef);
-        $rv .= qq{|<a\nhref="?$A">Atom feed</a>]} .
-                qq{\n\t\t\tdownload mbox.gz: } .
-                # we set name=z w/o using it since it seems required for
-                # lynx (but works fine for w3m).
-                qq{<input\ntype=submit\nname=z\nvalue="results only"/>|} .
-                qq{<input\ntype=submit\nname=x\nvalue="full threads"/>} .
-                qq{</pre></form><pre>};
+        $rv .= qq{|<a\nhref="?$A">Atom feed</a>]};
+        if ($ctx->{-inbox}->search->has_threadid) {
+                $rv .= qq{\n\t\t\tdownload mbox.gz: } .
+                        # we set name=z w/o using it since it seems required for
+                        # lynx (but works fine for w3m).
+                        qq{<input\ntype=submit\nname=z\n} .
+                                q{value="results only"/>} .
+                        qq{|<input\ntype=submit\nname=x\n} .
+                                q{value="full threads"/>};
+        } else { # BOFH needs to --reindex
+                $rv .= qq{\n\t\t\t\t\t\tdownload: } .
+                        qq{<input\ntype=submit\nname=z\nvalue="mbox.gz"/>}
+        }
+        $rv .= qq{</pre></form><pre>};
 }
 
 sub search_nav_bot {
diff --git a/lib/PublicInbox/V2Writable.pm b/lib/PublicInbox/V2Writable.pm
index 0a91a132..b0148dba 100644
--- a/lib/PublicInbox/V2Writable.pm
+++ b/lib/PublicInbox/V2Writable.pm
@@ -1337,6 +1337,18 @@ sub index_sync {
                 xapian_only($self, $opt, $sync, $art_beg);
         }
 
+        # --reindex on the command-line
+        if ($opt->{reindex} && !ref($opt->{reindex}) && $idxlevel ne 'basic') {
+                $self->lock_acquire;
+                my $s0 = PublicInbox::SearchIdx->new($self->{ibx}, 0, 0);
+                if (my $xdb = $s0->idx_acquire) {
+                        my $n = $xdb->get_metadata('has_threadid');
+                        $xdb->set_metadata('has_threadid', 1) if $n ne '1';
+                }
+                $s0->idx_release;
+                $self->lock_release;
+        }
+
         # reindex does not pick up new changes, so we rerun w/o it:
         if ($opt->{reindex}) {
                 my %again = %$opt;