X-Git-Url: http://www.git.stargrave.org/?a=blobdiff_plain;f=lib%2FPublicInbox%2FSearch.pm;h=523003b3c269ae42e9ee210e91415b2846735daa;hb=1f1b1f0e22f7b4cbe5c8e843c1932222c0461393;hp=88c8dc70e17c3bedf3883f07555894b6c54eb7c3;hpb=7375e589c165cd0c5bae2d70ff8e279fb76216a2;p=public-inbox.git diff --git a/lib/PublicInbox/Search.pm b/lib/PublicInbox/Search.pm index 88c8dc70..523003b3 100644 --- a/lib/PublicInbox/Search.pm +++ b/lib/PublicInbox/Search.pm @@ -1,42 +1,32 @@ -# Copyright (C) 2015-2019 all contributors +# Copyright (C) 2015-2021 all contributors # License: AGPL-3.0+ # based on notmuch, but with no concept of folders, files or flags # # Read-only search interface for use by the web and NNTP interfaces package PublicInbox::Search; use strict; -use warnings; +use v5.10.1; +use parent qw(Exporter); +our @EXPORT_OK = qw(retry_reopen int_val get_pct xap_terms); +use List::Util qw(max); +use POSIX qw(strftime); +use Carp (); -# values for searching -use constant TS => 0; # Received: header in Unix time -use constant YYYYMMDD => 1; # Date: header for searching in the WWW UI -use constant DT => 2; # Date: YYYYMMDDHHMMSS +# values for searching, changing the numeric value breaks +# compatibility with old indices (so don't change them it) +use constant { + TS => 0, # Received: in Unix time (IMAP INTERNALDATE, JMAP receivedAt) + YYYYMMDD => 1, # redundant with DT below + DT => 2, # Date: YYYYMMDDHHMMSS (IMAP SENT*, JMAP sentAt) -use PublicInbox::SearchMsg; -use PublicInbox::MIME; -use PublicInbox::MID qw/id_compress/; -use PublicInbox::Over; -my $QP_FLAGS; -sub load_xapian () { - $QP_FLAGS ||= eval { - require Search::Xapian; - Search::Xapian->import(qw(:standard)); + # added for public-inbox 1.6.0+ + BYTES => 3, # IMAP RFC822.SIZE + UID => 4, # IMAP UID == NNTP article number == Xapian docid + THREADID => 5, # RFC 8474, RFC 8621 - # n.b. FLAG_PURE_NOT is expensive not suitable for a public - # website as it could become a denial-of-service vector - # FLAG_PHRASE also seems to cause performance problems chert - # (and probably earlier Xapian DBs). glass seems fine... - # TODO: make this an option, maybe? - # or make indexlevel=medium as default - FLAG_PHRASE()|FLAG_BOOLEAN()|FLAG_LOVEHATE()|FLAG_WILDCARD(); - }; -}; + # TODO + # REPLYCNT => ?, # IMAP ANSWERED -# This is English-only, everything else is non-standard and may be confused as -# a prefix common in patch emails -our $LANG = 'english'; - -use constant { # SCHEMA_VERSION history # 0 - initial # 1 - subject_path is lower-cased @@ -56,12 +46,75 @@ use constant { # 14 - fix ghost root vivification # 15 - see public-inbox-v2-format(5) # further bumps likely unnecessary, we'll suggest in-place - # "--reindex" use for further fixes and tweaks + # "--reindex" use for further fixes and tweaks: + # + # public-inbox v1.5.0 adds (still SCHEMA_VERSION=15): + # * "lid:" and "l:" for List-Id searches + # + # v1.6.0 adds BYTES, UID and THREADID values SCHEMA_VERSION => 15, }; +use PublicInbox::Smsg; +use PublicInbox::Over; +our $QP_FLAGS; +our %X = map { $_ => 0 } qw(BoolWeight Database Enquire QueryParser Stem Query); +our $Xap; # 'Search::Xapian' or 'Xapian' +our $NVRP; # '$Xap::'.('NumberValueRangeProcessor' or 'NumberRangeProcessor') + +# ENQ_DESCENDING and ENQ_ASCENDING weren't in SWIG Xapian.pm prior to 1.4.16, +# let's hope the ABI is stable +our $ENQ_DESCENDING = 0; +our $ENQ_ASCENDING = 1; + +sub load_xapian () { + return 1 if defined $Xap; + # n.b. PI_XAPIAN is intended for development use only. We still + # favor Search::Xapian since that's what's available in current + # Debian stable (10.x) and derived distros. + for my $x (($ENV{PI_XAPIAN} // 'Search::Xapian'), 'Xapian') { + eval "require $x"; + next if $@; + + $x->import(qw(:standard)); + $Xap = $x; + + # `version_string' was added in Xapian 1.1 + my $xver = eval('v'.eval($x.'::version_string()')) // + eval('v'.eval($x.'::xapian_version_string()')); + + # NumberRangeProcessor was added in Xapian 1.3.6, + # NumberValueRangeProcessor was removed for 1.5.0+, + # favor the older /Value/ variant since that's what our + # (currently) preferred Search::Xapian supports + $NVRP = $x.'::'.($x eq 'Xapian' && $xver ge v1.5 ? + 'NumberRangeProcessor' : 'NumberValueRangeProcessor'); + $X{$_} = $Xap.'::'.$_ for (keys %X); + + *sortable_serialise = $x.'::sortable_serialise'; + *sortable_unserialise = $x.'::sortable_unserialise'; + # n.b. FLAG_PURE_NOT is expensive not suitable for a public + # website as it could become a denial-of-service vector + # FLAG_PHRASE also seems to cause performance problems chert + # (and probably earlier Xapian DBs). glass seems fine... + # TODO: make this an option, maybe? + # or make indexlevel=medium as default + $QP_FLAGS = FLAG_PHRASE() | FLAG_BOOLEAN() | FLAG_LOVEHATE() | + FLAG_WILDCARD(); + return 1; + } + undef; +} + +# This is English-only, everything else is non-standard and may be confused as +# a prefix common in patch emails +our $LANG = 'english'; + +# note: the non-X term prefix allocations are shared with +# Xapian omega, see xapian-applications/omega/docs/termprefixes.rst my %bool_pfx_external = ( mid => 'Q', # Message-ID (full/exact), this is mostly uniQue + lid => 'G', # newsGroup (or similar entity), just inside <> dfpre => 'XDFPRE', dfpost => 'XDFPOST', dfblob => 'XDFPRE XDFPOST', @@ -72,6 +125,7 @@ my %prob_prefix = ( # for mairix compatibility s => 'S', m => 'XM', # 'mid:' (bool) is exact, 'm:' (prob) can do partial + l => 'XL', # 'lid:' (bool) is exact, 'l:' (prob) can do partial f => 'A', t => 'XTO', tc => 'XTO XCC', @@ -95,15 +149,15 @@ my %prob_prefix = ( ); # not documenting m: and mid: for now, the using the URLs works w/o Xapian +# not documenting lid: for now, either, it is probably redundant with l:, +# especially since we don't offer boolean searches for To/Cc/From +# headers, either our @HELP = ( 's:' => 'match within Subject e.g. s:"a quick brown fox"', 'd:' => < < 'match within message body, including text attachments', 'nq:' => 'match non-quoted text within message body', @@ -114,6 +168,7 @@ EOF 'f:' => 'match within the From header', 'a:' => 'match within the To, Cc, and From headers', 'tc:' => 'match within the To and Cc headers', + 'l:' => 'match contents of the List-Id header', 'bs:' => 'match within the Subject and body', 'dfn:' => 'match filename from diff', 'dfa:' => 'match diff removed (-) lines', @@ -123,65 +178,79 @@ EOF 'dfpre:' => 'match pre-image git blob ID', 'dfpost:' => 'match post-image git blob ID', 'dfblob:' => 'match either pre or post-image git blob ID', + 'rt:' => <{version} == 1) { - "$self->{inboxdir}/public-inbox/xapian" . SCHEMA_VERSION; - } else { - my $dir = "$self->{inboxdir}/xap" . SCHEMA_VERSION; - return $dir if $rdonly; - - my $shard = $self->{shard}; - defined $shard or die "shard not given"; - $dir .= "/$shard"; + if ($rdonly || !defined($self->{shard})) { + $self->{xpfx}; + } else { # v2 + extindex only: + "$self->{xpfx}/$self->{shard}"; } } -sub _xdb ($) { +# returns all shards as separate Xapian::Database objects w/o combining +sub xdb_shards_flat ($) { my ($self) = @_; - my $dir = xdir($self, 1); - my ($xdb, $slow_phrase); - my $qpf = \($self->{qp_flags} ||= $QP_FLAGS); - if ($self->{version} >= 2) { - foreach my $shard (<$dir/*>) { - -d $shard && $shard =~ m!/[0-9]+\z! or next; - my $sub = Search::Xapian::Database->new($shard); - if ($xdb) { - $xdb->add_database($sub); - } else { - $xdb = $sub; - } - $slow_phrase ||= -f "$shard/iamchert"; - } + my $xpfx = $self->{xpfx}; + my (@xdb, $slow_phrase); + load_xapian(); + $self->{qp_flags} //= $QP_FLAGS; + if ($xpfx =~ m!/xapian[0-9]+\z!) { + @xdb = ($X{Database}->new($xpfx)); + $self->{qp_flags} |= FLAG_PHRASE() if !-f "$xpfx/iamchert"; } else { - $slow_phrase = -f "$dir/iamchert"; - $xdb = Search::Xapian::Database->new($dir); + opendir(my $dh, $xpfx) or return (); # not initialized yet + # We need numeric sorting so shard[0] is first for reading + # Xapian metadata, if needed + my $last = max(grep(/\A[0-9]+\z/, readdir($dh))) // return (); + for (0..$last) { + my $shard_dir = "$self->{xpfx}/$_"; + push @xdb, $X{Database}->new($shard_dir); + $slow_phrase ||= -f "$shard_dir/iamchert"; + } + $self->{qp_flags} |= FLAG_PHRASE() if !$slow_phrase; } - $$qpf |= FLAG_PHRASE() unless $slow_phrase; - $xdb; + @xdb; +} + +# v2 Xapian docids don't conflict, so they're identical to +# NNTP article numbers and IMAP UIDs. +# https://trac.xapian.org/wiki/FAQ/MultiDatabaseDocumentID +sub mdocid { + my ($nshard, $mitem) = @_; + my $docid = $mitem->get_docid; + int(($docid - 1) / $nshard) + 1; +} + +sub mset_to_artnums { + my ($self, $mset) = @_; + my $nshard = $self->{nshard}; + [ map { mdocid($nshard, $_) } $mset->items ]; } sub xdb ($) { my ($self) = @_; - $self->{xdb} ||= do { - load_xapian(); - _xdb($self); + $self->{xdb} // do { + my @xdb = $self->xdb_shards_flat or return; + $self->{nshard} = scalar(@xdb); + my $xdb = shift @xdb; + $xdb->add_database($_) for @xdb; + $self->{xdb} = $xdb; }; } sub new { my ($class, $ibx) = @_; ref $ibx or die "BUG: expected PublicInbox::Inbox object: $ibx"; - my $self = bless { - inboxdir => $ibx->{inboxdir}, - altid => $ibx->{altid}, - version => $ibx->{version} // 1, - }, $class; - my $dir = xdir($self, 1); - $self->{over_ro} = PublicInbox::Over->new("$dir/over.sqlite3"); + my $xap = $ibx->version > 1 ? 'xap' : 'public-inbox/xapian'; + my $xpfx = "$ibx->{inboxdir}/$xap".SCHEMA_VERSION; + my $self = bless { xpfx => $xpfx }, $class; + $self->{altid} = $ibx->{altid} if defined($ibx->{altid}); $self; } @@ -193,101 +262,245 @@ sub reopen { $self; # make chaining easier } +# Convert git "approxidate" ranges to something usable with our +# Xapian indices. At the moment, Xapian only offers a C++-only API +# and neither the SWIG nor XS bindings allow us to use custom code +# to parse dates (and libgit2 doesn't expose git__date_parse, either, +# so we're running git-rev-parse(1)). +# This replaces things we need to send to $git->date_parse with +# "\0".$strftime_format.['+'|$idx]."\0" placeholders +sub date_parse_prepare { + my ($to_parse, $pfx, $range) = @_; + # are we inside a parenthesized statement? + my $end = $range =~ s/([\)\s]*)\z// ? $1 : ''; + my @r = split(/\.\./, $range, 2); + + # expand "d:20101002" => "d:20101002..20101003" and like + # n.b. git doesn't do YYYYMMDD w/o '-', it needs YYYY-MM-DD + # We upgrade "d:" to "dt:" to iff using approxidate + if ($pfx eq 'd') { + my $fmt = "\0%Y%m%d"; + if (!defined($r[1])) { + if ($r[0] =~ /\A([0-9]{4})([0-9]{2})([0-9]{2})\z/) { + push @$to_parse, "$1-$2-$3"; + # we could've handled as-is, but we need + # to parse anyways for "d+" below + } else { + push @$to_parse, $r[0]; + if ($r[0] !~ /\A[0-9]{4}-[0-9]{2}-[0-9]{2}\z/) { + $pfx = 'dt'; + $fmt = "\0%Y%m%d%H%M%S"; + } + } + $r[0] = "$fmt+$#$to_parse\0"; + $r[1] = "$fmt+\0"; + } else { + for my $x (@r) { + next if $x eq '' || $x =~ /\A[0-9]{8}\z/; + push @$to_parse, $x; + if ($x !~ /\A[0-9]{4}-[0-9]{2}-[0-9]{2}\z/) { + $pfx = 'dt'; + } + $x = "$fmt$#$to_parse\0"; + } + if ($pfx eq 'dt') { + for (@r) { + s/\0%Y%m%d/\0%Y%m%d%H%M%S/; + s/\A([0-9]{8})\z/${1}000000/; + } + } + } + } elsif ($pfx eq 'dt') { + if (!defined($r[1])) { # git needs gaps and not /\d{14}/ + if ($r[0] =~ /\A([0-9]{4})([0-9]{2})([0-9]{2}) + ([0-9]{2})([0-9]{2})([0-9]{2})\z/x) { + push @$to_parse, "$1-$2-$3 $4:$5:$6"; + } else { + push @$to_parse, $r[0]; + } + $r[0] = "\0%Y%m%d%H%M%S$#$to_parse\0"; + $r[1] = "\0%Y%m%d%H%M%S+\0"; + } else { + for my $x (@r) { + next if $x eq '' || $x =~ /\A[0-9]{14}\z/; + push @$to_parse, $x; + $x = "\0%Y%m%d%H%M%S$#$to_parse\0"; + } + } + } else { # "rt", let git interpret "YYYY", deal with Y10K later :P + for my $x (@r) { + next if $x eq '' || $x =~ /\A[0-9]{5,}\z/; + push @$to_parse, $x; + $x = "\0%s$#$to_parse\0"; + } + $r[1] //= "\0%s+\0"; # add 1 day + } + "$pfx:".join('..', @r).$end; +} + +sub date_parse_finalize { + my ($git, $to_parse) = @_; + # git-rev-parse can handle any number of args up to system + # limits (around (4096*32) bytes on Linux). + my @r = $git->date_parse(@$to_parse); + # n.b. git respects TZ, times stored in SQLite/Xapian are always UTC, + # and gmtime doesn't seem to do the right thing when TZ!=UTC + my ($i, $t); + $_[2] =~ s/\0(%[%YmdHMSs]+)([0-9\+]+)\0/ + $t = $2 eq '+' ? ($r[$i]+86400) : $r[$i=$2+0]; + $1 eq '%s' ? $t : strftime($1, gmtime($t))/sge; +} + +# n.b. argv never has NUL, though we'll need to filter it out +# if this $argv isn't from a command execution +sub query_argv_to_string { + my (undef, $git, $argv) = @_; + my $to_parse; + my $tmp = join(' ', map {; + if (s!\b(d|rt|dt):(\S+)\z!date_parse_prepare( + $to_parse //= [], $1, $2)!sge) { + $_; + } elsif (/\s/) { + s/(.*?)\b(\w+:)// ? qq{$1$2"$_"} : qq{"$_"}; + } else { + $_ + } + } @$argv); + date_parse_finalize($git, $to_parse, $tmp) if $to_parse; + $tmp +} + +# this is for the WWW "q=" query parameter and "lei q --stdin" +# it can't do d:"5 days ago", but it will do d:5.days.ago +sub query_approxidate { + my (undef, $git) = @_; # $_[2] = $query_string (modified in-place) + my $DQ = qq<"\x{201c}\x{201d}>; # Xapian can use curly quotes + $_[2] =~ tr/\x00/ /; # Xapian doesn't do NUL, we use it as a placeholder + my ($terms, $phrase, $to_parse); + $_[2] =~ s{([^$DQ]*)([$DQ][^$DQ]*[$DQ])?}{ + ($terms, $phrase) = ($1, $2); + $terms =~ s!\b(d|rt|dt):(\S+)! + date_parse_prepare($to_parse //= [], $1, $2)!sge; + $terms.($phrase // ''); + }sge; + date_parse_finalize($git, $to_parse, $_[2]) if $to_parse; +} + # read-only -sub query { +sub mset { my ($self, $query_string, $opts) = @_; $opts ||= {}; - if ($query_string eq '' && !$opts->{mset}) { - $self->{over_ro}->recent($opts); - } else { - my $qp = qp($self); - my $qp_flags = $self->{qp_flags}; - my $query = $qp->parse_query($query_string, $qp_flags); - $opts->{relevance} = 1 unless exists $opts->{relevance}; - _do_enquire($self, $query, $opts); - } + my $qp = $self->{qp} //= $self->qparse_new; + my $query = $qp->parse_query($query_string, $self->{qp_flags}); + _do_enquire($self, $query, $opts); } sub retry_reopen { - my ($self, $cb) = @_; + my ($self, $cb, @arg) = @_; for my $i (1..10) { if (wantarray) { - my @ret; - eval { @ret = $cb->() }; + my @ret = eval { $cb->($self, @arg) }; return @ret unless $@; } else { - my $ret; - eval { $ret = $cb->() }; + my $ret = eval { $cb->($self, @arg) }; return $ret unless $@; } # Exception: The revision being read has been discarded - # you should call Xapian::Database::reopen() - if (ref($@) eq 'Search::Xapian::DatabaseModifiedError') { - warn "reopen try #$i on $@\n"; + if (ref($@) =~ /\bDatabaseModifiedError\b/) { reopen($self); } else { # let caller decide how to spew, because ExtMsg queries # get wonky and trigger: # "something terrible happened at .../Xapian/Enquire.pm" - die; + Carp::croak($@); } } - die "Too many Xapian database modifications in progress\n"; + Carp::croak("Too many Xapian database modifications in progress\n"); } sub _do_enquire { my ($self, $query, $opts) = @_; - retry_reopen($self, sub { _enquire_once($self, $query, $opts) }); + retry_reopen($self, \&_enquire_once, $query, $opts); } -sub _enquire_once { +# returns true if all docs have the THREADID value +sub has_threadid ($) { + my ($self) = @_; + (xdb($self)->get_metadata('has_threadid') // '') eq '1'; +} + +sub _enquire_once { # retry_reopen callback my ($self, $query, $opts) = @_; my $xdb = xdb($self); - my $enquire = Search::Xapian::Enquire->new($xdb); + if (defined(my $eidx_key = $opts->{eidx_key})) { + $query = $X{Query}->new(OP_FILTER(), $query, 'O'.$eidx_key); + } + if (defined(my $uid_range = $opts->{uid_range})) { + my $range = $X{Query}->new(OP_VALUE_RANGE(), UID, + sortable_serialise($uid_range->[0]), + sortable_serialise($uid_range->[1])); + $query = $X{Query}->new(OP_FILTER(), $query, $range); + } + my $enquire = $X{Enquire}->new($xdb); $enquire->set_query($query); $opts ||= {}; - my $desc = !$opts->{asc}; - if (($opts->{mset} || 0) == 2) { - $enquire->set_docid_order(Search::Xapian::ENQ_ASCENDING()); - $enquire->set_weighting_scheme(Search::Xapian::BoolWeight->new); - } elsif ($opts->{relevance}) { - $enquire->set_sort_by_relevance_then_value(TS, $desc); - } else { - $enquire->set_sort_by_value_then_relevance(TS, $desc); + my $rel = $opts->{relevance} // 0; + if ($rel == -2) { # ORDER BY docid/UID (highest first) + $enquire->set_weighting_scheme($X{BoolWeight}->new); + $enquire->set_docid_order($ENQ_DESCENDING); + } elsif ($rel == -1) { # ORDER BY docid/UID (lowest first) + $enquire->set_weighting_scheme($X{BoolWeight}->new); + $enquire->set_docid_order($ENQ_ASCENDING); + } elsif ($rel == 0) { + $enquire->set_sort_by_value_then_relevance(TS, !$opts->{asc}); + } else { # rel > 0 + $enquire->set_sort_by_relevance_then_value(TS, !$opts->{asc}); } - my $offset = $opts->{offset} || 0; - my $limit = $opts->{limit} || 50; - my $mset = $enquire->get_mset($offset, $limit); - return $mset if $opts->{mset}; - my @msgs = map { - PublicInbox::SearchMsg->load_doc($_->get_document); - } $mset->items; - return \@msgs unless wantarray; - - ($mset->get_matches_estimated, \@msgs) + + # `mairix -t / --threads' or JMAP collapseThreads + if ($opts->{threads} && has_threadid($self)) { + $enquire->set_collapse_key(THREADID); + } + $enquire->get_mset($opts->{offset} || 0, $opts->{limit} || 50); +} + +sub mset_to_smsg { + my ($self, $ibx, $mset) = @_; + my $nshard = $self->{nshard}; + my $i = 0; + my %order = map { mdocid($nshard, $_) => ++$i } $mset->items; + my @msgs = sort { + $order{$a->{num}} <=> $order{$b->{num}} + } @{$ibx->over->get_all(keys %order)}; + wantarray ? ($mset->get_matches_estimated, \@msgs) : \@msgs; } # read-write -sub stemmer { Search::Xapian::Stem->new($LANG) } +sub stemmer { $X{Stem}->new($LANG) } # read-only -sub qp { +sub qparse_new { my ($self) = @_; - my $qp = $self->{query_parser}; - return $qp if $qp; my $xdb = xdb($self); - # new parser - $qp = Search::Xapian::QueryParser->new; + my $qp = $X{QueryParser}->new; $qp->set_default_op(OP_AND()); $qp->set_database($xdb); - $qp->set_stemmer($self->stemmer); + $qp->set_stemmer(stemmer($self)); $qp->set_stemming_strategy(STEM_SOME()); - $qp->set_max_wildcard_expansion(100); - $qp->add_valuerangeprocessor( - Search::Xapian::NumberValueRangeProcessor->new(YYYYMMDD, 'd:')); - $qp->add_valuerangeprocessor( - Search::Xapian::NumberValueRangeProcessor->new(DT, 'dt:')); + 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+ + $cb->($qp, $NVRP->new(YYYYMMDD, 'd:')); + $cb->($qp, $NVRP->new(DT, 'dt:')); + + # for IMAP, undocumented for WWW and may be split off go away + $cb->($qp, $NVRP->new(BYTES, 'z:')); + $cb->($qp, $NVRP->new(TS, 'rt:')); + $cb->($qp, $NVRP->new(UID, 'uid:')); while (my ($name, $prefix) = each %bool_pfx_external) { $qp->add_boolean_prefix($name, $_) foreach split(/ /, $prefix); @@ -296,9 +509,11 @@ sub qp { # we do not actually create AltId objects, # just parse the spec to avoid the extra DB handles for now. if (my $altid = $self->{altid}) { - my $user_pfx = $self->{-user_pfx} ||= []; + my $user_pfx = $self->{-user_pfx} = []; for (@$altid) { # $_ = 'serial:gmane:/path/to/gmane.msgmap.sqlite3' + # note: Xapian supports multibyte UTF-8, /^[0-9]+$/, + # and '_' with prefixes matching \w+ /\Aserial:(\w+):/ or next; my $pfx = $1; push @$user_pfx, "$pfx:", <add_prefix($name, $_) foreach split(/ /, $prefix); } - - $self->{query_parser} = $qp; -} - -sub lookup_article { - my ($self, $num) = @_; - $self->{over_ro}->get_art($num); + $qp; } sub help { my ($self) = @_; - $self->qp; # parse altids + $self->{qp} //= $self->qparse_new; # parse altids my @ret = @HELP; if (my $user_pfx = $self->{-user_pfx}) { push @ret, @$user_pfx; @@ -332,4 +541,40 @@ sub help { \@ret; } +sub int_val ($$) { + my ($doc, $col) = @_; + my $val = $doc->get_value($col) or return; # undefined is '' in Xapian + sortable_unserialise($val) + 0; # PV => IV conversion +} + +sub get_pct ($) { # mset item + # Capped at "99%" since "100%" takes an extra column in the + # thread skeleton view. says the value isn't + # very meaningful, anyways. + my $n = $_[0]->get_percent; + $n > 99 ? 99 : $n; +} + +sub xap_terms ($$;@) { + my ($pfx, $xdb_or_doc, @docid) = @_; # @docid may be empty () + my %ret; + my $end = $xdb_or_doc->termlist_end(@docid); + my $cur = $xdb_or_doc->termlist_begin(@docid); + for (; $cur != $end; $cur++) { + $cur->skip_to($pfx); + last if $cur == $end; + my $tn = $cur->get_termname; + $ret{substr($tn, length($pfx))} = undef if !index($tn, $pfx); + } + wantarray ? sort(keys(%ret)) : \%ret; +} + +# get combined docid from over.num: +# (not generic Xapian, only works with our sharding scheme) +sub num2docid ($$) { + my ($self, $num) = @_; + my $nshard = $self->{nshard}; + ($num - 1) * $nshard + $num % $nshard + 1; +} + 1;