1 files changed, 87 insertions, 0 deletions
diff --git a/lib/PublicInbox/Isearch.pm b/lib/PublicInbox/Isearch.pm
new file mode 100644
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--- /dev/null
+++ b/lib/PublicInbox/Isearch.pm
@@ -0,0 +1,87 @@
+# Copyright (C) 2020 all contributors <meta@public-inbox.org>
+# License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>
+
+# Provides everything the PublicInbox::Search object does;
+# but uses global ExtSearch (->ALL) with an eidx_key query to
+# emulate per-Inbox search using ->ALL.
+package PublicInbox::Isearch;
+use strict;
+use v5.10.1;
+use PublicInbox::ExtSearch;
+use PublicInbox::Search;
+
+sub new {
+        my (undef, $ibx, $es) = @_;
+        bless { es => $es, eidx_key => $ibx->eidx_key }, __PACKAGE__;
+}
+
+sub mset {
+        my ($self, $str, $opt) = @_;
+        $self->{es}->mset($str, { $opt ? %$opt : (),
+                                eidx_key => $self->{eidx_key} });
+}
+
+sub _ibx_id ($) {
+        my ($self) = @_;
+        my $sth = $self->{es}->over->dbh->prepare_cached(<<'', undef, 1);
+SELECT ibx_id FROM inboxes WHERE eidx_key = ? LIMIT 1
+
+        $sth->execute($self->{eidx_key});
+        $sth->fetchrow_array //
+                die "E: `$self->{eidx_key}' not in $self->{es}->{topdir}\n";
+}
+
+sub mset_to_artnums {
+        my ($self, $mset) = @_;
+        my $docids = PublicInbox::Search::mset_to_artnums($self->{es}, $mset);
+        my $ibx_id = $self->{-ibx_id} //= _ibx_id($self);
+        my $qmarks = join(',', map { '?' } @$docids);
+        my $rows = $self->{es}->over->dbh->
+                        selectall_arrayref(<<"", undef, $ibx_id, @$docids);
+SELECT docid,xnum FROM xref3 WHERE ibx_id = ? AND docid IN ($qmarks)
+
+        my $i = -1;
+        my %order = map { $_ => ++$i } @$docids;
+        my @xnums;
+        for my $row (@$rows) { # @row = ($docid, $xnum)
+                my $idx = delete($order{$row->[0]}) // next;
+                $xnums[$idx] = $row->[1];
+        }
+        if (scalar keys %order) {
+                warn "W: $self->{es}->{topdir} #",
+                        join(', #', sort keys %order),
+                        " not mapped to `$self->{eidx_key}'\n";
+                warn "W: $self->{es}->{topdir} may need to be reindexed\n";
+                @xnums = grep { defined } @xnums;
+        }
+        \@xnums;
+}
+
+sub mset_to_smsg {
+        my ($self, $ibx, $mset) = @_; # $ibx is a real inbox, not eidx
+        my $xnums = mset_to_artnums($self, $mset);
+        my $i = -1;
+        my %order = map { $_ => ++$i } @$xnums;
+        my $unordered = $ibx->over->get_all(@$xnums);
+        my @msgs;
+        for my $smsg (@$unordered) {
+                my $idx = delete($order{$smsg->{num}}) // do {
+                        warn "W: $ibx->{inboxdir} #$smsg->{num}\n";
+                        next;
+                };
+                $msgs[$idx] = $smsg;
+        }
+        if (scalar keys %order) {
+                warn "W: $ibx->{inboxdir} #",
+                        join(', #', sort keys %order),
+                        " no longer valid\n";
+                warn "W: $self->{es}->{topdir} may need to be reindexed\n";
+        }
+        wantarray ? ($mset->get_matches_estimated, \@msgs) : \@msgs;
+}
+
+sub has_threadid { 1 }
+
+sub help { $_[0]->{es}->help }
+
+1;