1 # Copyright (C) 2015, all contributors <meta@public-inbox.org>
2 # License: AGPLv3 or later (https://www.gnu.org/licenses/agpl-3.0.txt)
3 # based on notmuch, but with no concept of folders, files or flags
4 package PublicInbox::Search;
7 use PublicInbox::SearchMsg;
8 use Search::Xapian qw/:standard/;
10 use PublicInbox::MID qw/mid_clean mid_compress/;
12 # This is English-only, everything else is non-standard and may be confused as
13 # a prefix common in patch emails
14 our $REPLY_RE = qr/^re:\s+/i;
15 our $LANG = 'english';
19 # SCHEMA_VERSION history
21 # 1 - subject_path is lower-cased
22 # 2 - subject_path is mid_compress in the index, only
23 # 3 - message-ID is compressed if it includes '%' (hack!)
24 # 4 - change "Re: " normalization, avoid circular Reference ghosts
25 # 5 - subject_path drops trailing '.'
26 # 6 - preserve References: order in document data
28 QP_FLAGS => FLAG_PHRASE|FLAG_BOOLEAN|FLAG_LOVEHATE|FLAG_WILDCARD,
32 my %bool_pfx_internal = (
33 type => 'T', # "mail" or "ghost"
34 mid => 'Q', # uniQue id (Message-ID or mid_compress)
37 my %bool_pfx_external = (
39 thread => 'G', # newsGroup (or similar entity - e.g. a web forum name)
40 references => 'XREFS',
48 my %all_pfx = (%bool_pfx_internal, %bool_pfx_external, %prob_prefix);
50 sub xpfx { $all_pfx{$_[0]} }
53 my %meta_pfx = (mid => 1, thread => 1, path => 1, type => 1);
54 while (my ($k, $v) = each %all_pfx) {
55 $PFX2TERM_RMAP{$v} = $k if $meta_pfx{$k};
58 my $mail_query = Search::Xapian::Query->new(xpfx('type') . 'mail');
61 my (undef, $git_dir) = @_;
62 "$git_dir/public-inbox/xapian" . SCHEMA_VERSION;
66 my ($class, $git_dir) = @_;
67 my $dir = $class->xdir($git_dir);
68 my $db = Search::Xapian::Database->new($dir);
69 bless { xdb => $db, git_dir => $git_dir }, $class;
72 sub reopen { $_[0]->{xdb}->reopen }
76 my ($self, $query_string, $opts) = @_;
77 my $query = $self->qp->parse_query($query_string, QP_FLAGS);
80 $opts->{relevance} = 1;
81 $self->do_enquire($query, $opts);
84 sub get_subject_path {
85 my ($self, $path, $opts) = @_;
86 my $query = $self->qp->parse_query("path:".mid_compress($path), 0);
87 $self->do_enquire($query, $opts);
90 # given a message ID, get followups to a message
92 my ($self, $mid, $opts) = @_;
93 $mid = mid_clean($mid);
94 $mid = mid_compress($mid);
96 my $irt = $qp->parse_query("inreplyto:$mid", 0);
97 my $ref = $qp->parse_query("references:$mid", 0);
98 my $query = Search::Xapian::Query->new(OP_OR, $irt, $ref);
99 $self->do_enquire($query, $opts);
103 my ($self, $mid, $opts) = @_;
104 my $smsg = eval { $self->lookup_message($mid) };
106 return { total => 0, msgs => [] } unless $smsg;
108 my $qtid = $qp->parse_query('thread:'.$smsg->thread_id, 0);
109 my $qsub = $qp->parse_query('path:'.mid_compress($smsg->path), 0);
110 my $query = Search::Xapian::Query->new(OP_OR, $qtid, $qsub);
111 $self->do_enquire($query, $opts);
117 my ($self, $query, $opts) = @_;
118 my $enquire = $self->enquire;
120 $query = Search::Xapian::Query->new(OP_AND, $query, $mail_query);
121 $enquire->set_query($query);
122 if ($opts->{relevance}) {
123 $enquire->set_sort_by_relevance_then_value(TS, 0);
125 $enquire->set_sort_by_value(TS, 0);
128 my $offset = $opts->{offset} || 0;
129 my $limit = $opts->{limit} || 50;
130 my $mset = $enquire->get_mset($offset, $limit);
132 PublicInbox::SearchMsg->load_doc($_->get_document);
135 { total => $mset->get_matches_estimated, msgs => \@msgs }
139 sub stemmer { Search::Xapian::Stem->new($LANG) }
145 my $qp = $self->{query_parser};
149 $qp = Search::Xapian::QueryParser->new;
150 $qp->set_default_op(OP_AND);
151 $qp->set_database($self->{xdb});
152 $qp->set_stemmer($self->stemmer);
153 $qp->set_stemming_strategy(STEM_SOME);
154 $qp->add_valuerangeprocessor($self->ts_range_processor);
155 $qp->add_valuerangeprocessor($self->date_range_processor);
157 while (my ($name, $prefix) = each %bool_pfx_external) {
158 $qp->add_boolean_prefix($name, $prefix);
161 while (my ($name, $prefix) = each %prob_prefix) {
162 $qp->add_prefix($name, $prefix);
165 $self->{query_parser} = $qp;
168 sub ts_range_processor {
169 $_[0]->{tsrp} ||= Search::Xapian::NumberValueRangeProcessor->new(TS);
172 sub date_range_processor {
173 $_[0]->{drp} ||= Search::Xapian::DateValueRangeProcessor->new(TS);
177 my ($self, $mid) = @_;
178 $mid = mid_clean($mid);
179 $mid = mid_compress($mid);
181 my $doc_id = $self->find_unique_doc_id('mid', $mid);
183 if (defined $doc_id) {
185 my $doc = $self->{xdb}->get_document($doc_id);
186 $smsg = PublicInbox::SearchMsg->wrap($doc, $mid);
187 $smsg->doc_id($doc_id);
192 sub find_unique_doc_id {
193 my ($self, $term, $value) = @_;
195 my ($begin, $end) = $self->find_doc_ids($term, $value);
197 return undef if $begin->equal($end); # not found
199 my $rv = $begin->get_docid;
203 $begin->equal($end) or die "Term '$term:$value' is not unique\n";
207 # returns begin and end PostingIterator
209 my ($self, $term, $value) = @_;
211 $self->find_doc_ids_for_term(xpfx($term) . $value);
214 # returns begin and end PostingIterator
215 sub find_doc_ids_for_term {
216 my ($self, $term) = @_;
217 my $db = $self->{xdb};
219 ($db->postlist_begin($term), $db->postlist_end($term));
222 # normalize subjects so they are suitable as pathnames for URLs
225 $subj = subject_normalized($subj);
226 $subj =~ s![^a-zA-Z0-9_\.~/\-]+!_!g;
230 sub subject_normalized {
232 $subj =~ s/\A\s+//s; # no leading space
233 $subj =~ s/\s+\z//s; # no trailing space
234 $subj =~ s/\s+/ /gs; # no redundant spaces
235 $subj =~ s/\.+\z//; # no trailing '.'
236 $subj =~ s/$REPLY_RE//igo; # remove reply prefix
242 $self->{enquire} ||= Search::Xapian::Enquire->new($self->{xdb});