X-Git-Url: http://www.git.stargrave.org/?a=blobdiff_plain;f=lib%2FPublicInbox%2FSearchThread.pm;h=2966907a9d4b3678a47a1b931b2f2287a17db161;hb=ccb66f35d293d3d0e3f9b119f7bd1fa019b93c75;hp=ee35f0d020616b86595c42d702cdc48082fe7971;hpb=decbc59daa3b08e58e749b5bd88a9d0cbbb7e14a;p=public-inbox.git

diff --git a/lib/PublicInbox/SearchThread.pm b/lib/PublicInbox/SearchThread.pm
index ee35f0d0..2966907a 100644
--- a/lib/PublicInbox/SearchThread.pm
+++ b/lib/PublicInbox/SearchThread.pm
@@ -7,7 +7,7 @@
 # Mail::Thread is unmaintained and unavailable on some distros.
 # We also do not want pruning or subject grouping, since we want
 # to encourage strict threading and hopefully encourage people
-# to use proper In-Reply-To.
+# to use proper In-Reply-To/References.
 #
 # This includes fixes from several open bugs for Mail::Thread
 #
@@ -21,41 +21,41 @@ package PublicInbox::SearchThread;
 use strict;
 use warnings;
 
-sub new {
-	return bless {
-		messages => $_[1],
-		id_table => {},
-		rootset  => []
-	}, $_[0];
-}
-
 sub thread {
-	my $self = shift;
-	_add_message($self, $_) foreach @{$self->{messages}};
-	my $id_table = delete $self->{id_table};
-	$self->{rootset} = [ grep {
+	my ($messages, $ordersub) = @_;
+	my $id_table = {};
+	_add_message($id_table, $_) foreach @$messages;
+	my $rootset = [ grep {
 		!delete($_->{parent}) && $_->visible } values %$id_table ];
+	$id_table = undef;
+	$rootset = $ordersub->($rootset);
+	$_->order_children($ordersub) for @$rootset;
+	$rootset;
 }
 
 sub _get_cont_for_id ($$) {
-	my ($self, $mid) = @_;
-	$self->{id_table}{$mid} ||= PublicInbox::SearchThread::Msg->new($mid);
+	my ($id_table, $mid) = @_;
+	$id_table->{$mid} ||= PublicInbox::SearchThread::Msg->new($mid);
 }
 
 sub _add_message ($$) {
-	my ($self, $smsg) = @_;
+	my ($id_table, $smsg) = @_;
 
 	# A. if id_table...
-	my $this = _get_cont_for_id($self, $smsg->{mid});
+	my $this = _get_cont_for_id($id_table, $smsg->{mid});
 	$this->{smsg} = $smsg;
 
 	# B. For each element in the message's References field:
 	defined(my $refs = $smsg->{references}) or return;
 
+	# This loop exists to help fill in gaps left from missing
+	# messages.  It is not needed in a perfect world where
+	# everything is perfectly referenced, only the last ref
+	# matters.
 	my $prev;
 	foreach my $ref ($refs =~ m/<([^>]+)>/g) {
 		# Find a Container object for the given Message-ID
-		my $cont = _get_cont_for_id($self, $ref);
+		my $cont = _get_cont_for_id($id_table, $ref);
 
 		# Link the References field's Containers together in
 		# the order implied by the References header
@@ -74,17 +74,8 @@ sub _add_message ($$) {
 	}
 
 	# C. Set the parent of this message to be the last element in
-	# References...
-	if ($prev && !$this->has_descendent($prev)) { # would loop
-		$prev->add_child($this)
-	}
-}
-
-sub order {
-	my ($self, $ordersub) = @_;
-	my $rootset = $ordersub->($self->{rootset});
-	$self->{rootset} = $rootset;
-	$_->order_children($ordersub) for @$rootset;
+	# References.
+	$prev->add_child($this) if defined $prev;
 }
 
 package PublicInbox::SearchThread::Msg;
@@ -127,8 +118,9 @@ sub add_child {
 
 sub has_descendent {
 	my ($self, $child) = @_;
+	my %seen; # loop prevention
 	while ($child) {
-		return 1 if $self == $child;
+		return 1 if $self == $child || $seen{$child}++;
 		$child = $child->{parent};
 	}
 	0;