1 files changed, 79 insertions, 0 deletions
diff --git a/lib/PublicInbox/MiscSearch.pm b/lib/PublicInbox/MiscSearch.pm
new file mode 100644
index 00000000..8beb8349
--- /dev/null
+++ b/lib/PublicInbox/MiscSearch.pm
@@ -0,0 +1,79 @@
+# Copyright (C) 2020 all contributors <meta@public-inbox.org>
+# License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>
+
+# read-only counterpart to MiscIdx
+package PublicInbox::MiscSearch;
+use strict;
+use v5.10.1;
+use PublicInbox::Search qw(retry_reopen);
+
+# Xapian value columns:
+our $MODIFIED = 0;
+
+# avoid conflicting with message Search::prob_prefix for UI/UX reasons
+my %PROB_PREFIX = (
+        description => 'S', # $INBOX_DIR/description
+        address => 'A',
+        listid => 'XLISTID',
+        url => 'XURL',
+        infourl => 'XINFOURL',
+        name => 'XNAME',
+        '' => 'S A XLISTID XNAME XURL XINFOURL'
+);
+
+sub new {
+        my ($class, $dir) = @_;
+        bless {
+                xdb => $PublicInbox::Search::X{Database}->new($dir)
+        }, $class;
+}
+
+# read-only
+sub mi_qp_new ($) {
+        my ($self) = @_;
+        my $xdb = $self->{xdb};
+        my $qp = $PublicInbox::Search::X{QueryParser}->new;
+        $qp->set_default_op(PublicInbox::Search::OP_AND());
+        $qp->set_database($xdb);
+        $qp->set_stemmer(PublicInbox::Search::stemmer($self));
+        $qp->set_stemming_strategy(PublicInbox::Search::STEM_SOME());
+        my $cb = $qp->can('set_max_wildcard_expansion') //
+                $qp->can('set_max_expansion'); # Xapian 1.5.0+
+        $cb->($qp, 100);
+        $cb = $qp->can('add_valuerangeprocessor') //
+                $qp->can('add_rangeprocessor'); # Xapian 1.5.0+
+        while (my ($name, $prefix) = each %PROB_PREFIX) {
+                $qp->add_prefix($name, $_) for split(/ /, $prefix);
+        }
+        $qp->add_boolean_prefix('type', 'T');
+        $qp;
+}
+
+sub misc_enquire_once { # retry_reopen callback
+        my ($self, $qr, $opt) = @{$_[0]};
+        my $eq = $PublicInbox::Search::X{Enquire}->new($self->{xdb});
+        $eq->set_query($qr);
+        my $desc = !$opt->{asc};
+        my $rel = $opt->{relevance} // 0;
+        if ($rel == -1) { # ORDER BY docid/UID
+                $eq->set_docid_order($PublicInbox::Search::ENQ_ASCENDING);
+                $eq->set_weighting_scheme($PublicInbox::Search::X{BoolWeight}->new);
+        } elsif ($rel) {
+                $eq->set_sort_by_relevance_then_value($MODIFIED, $desc);
+        } else {
+                $eq->set_sort_by_value_then_relevance($MODIFIED, $desc);
+        }
+        $eq->get_mset($opt->{offset} || 0, $opt->{limit} || 200);
+}
+
+sub mset {
+        my ($self, $qs, $opt) = @_;
+        $opt ||= {};
+        my $qp = $self->{qp} //= mi_qp_new($self);
+        $qs = 'type:inbox' if $qs eq '';
+        my $qr = $qp->parse_query($qs, $PublicInbox::Search::QP_FLAGS);
+        $opt->{relevance} = 1 unless exists $opt->{relevance};
+        retry_reopen($self, \&misc_enquire_once, [ $self, $qr, $opt ]);
+}
+
+1;