242 lines
6.1 KiB
Perl
242 lines
6.1 KiB
Perl
#!/usr/bin/perl
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# xapian-omega search engine plugin
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package IkiWiki::Plugin::search;
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use warnings;
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use strict;
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use IkiWiki 3.00;
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sub import {
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hook(type => "getsetup", id => "search", call => \&getsetup);
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hook(type => "checkconfig", id => "search", call => \&checkconfig);
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hook(type => "pagetemplate", id => "search", call => \&pagetemplate);
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hook(type => "postscan", id => "search", call => \&index);
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hook(type => "delete", id => "search", call => \&delete);
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hook(type => "cgi", id => "search", call => \&cgi);
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}
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sub getsetup () {
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return
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plugin => {
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safe => 1,
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rebuild => 1,
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section => "web",
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},
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omega_cgi => {
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type => "string",
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example => "/usr/lib/cgi-bin/omega/omega",
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description => "path to the omega cgi program",
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safe => 0, # external program
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rebuild => 0,
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},
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}
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sub checkconfig () {
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foreach my $required (qw(url cgiurl)) {
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if (! length $config{$required}) {
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error(sprintf(gettext("Must specify %s when using the %s plugin"), $required, 'search'));
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}
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}
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if (! defined $config{omega_cgi}) {
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$config{omega_cgi}="/usr/lib/cgi-bin/omega/omega";
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}
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# This is a mass dependency, so if the search form template
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# changes, every page is rebuilt.
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add_depends("", "templates/searchform.tmpl");
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}
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my $form;
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sub pagetemplate (@) {
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my %params=@_;
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my $page=$params{page};
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my $template=$params{template};
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# Add search box to page header.
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if ($template->query(name => "searchform")) {
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if (! defined $form) {
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my $searchform = template("searchform.tmpl", blind_cache => 1);
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$searchform->param(searchaction => $config{cgiurl});
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$searchform->param(html5 => $config{html5});
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$form=$searchform->output;
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}
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$template->param(searchform => $form);
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}
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}
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my $scrubber;
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my $stemmer;
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sub index (@) {
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my %params=@_;
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setupfiles();
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# A unique pageterm is used to identify the document for a page.
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my $pageterm=pageterm($params{page});
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return unless defined $pageterm;
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my $db=xapiandb();
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my $doc=Search::Xapian::Document->new();
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my $caption=pagetitle($params{page});
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my $title;
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if (exists $pagestate{$params{page}}{meta} &&
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exists $pagestate{$params{page}}{meta}{title}) {
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$title=$pagestate{$params{page}}{meta}{title};
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}
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else {
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$title=$caption;
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}
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# Remove html from text to be indexed.
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if (! defined $scrubber) {
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eval q{use HTML::Scrubber};
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if (! $@) {
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$scrubber=HTML::Scrubber->new(allow => []);
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}
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}
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my $toindex = defined $scrubber ? $scrubber->scrub($params{content}) : $params{content};
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# Take 512 characters for a sample, then extend it out
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# if it stopped in the middle of a word.
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my $size=512;
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my ($sample)=substr($toindex, 0, $size);
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if (length($sample) == $size) {
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my $max=length($toindex);
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my $next;
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while ($size < $max &&
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($next=substr($toindex, $size++, 1)) !~ /\s/) {
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$sample.=$next;
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}
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}
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$sample=~s/\n/ /g;
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# data used by omega
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# Decode html entities in it, since omega re-encodes them.
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eval q{use HTML::Entities};
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error $@ if $@;
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$doc->set_data(
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"url=".urlto($params{page}, "")."\n".
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"sample=".decode_entities($sample)."\n".
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"caption=".decode_entities($caption)."\n".
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"modtime=$IkiWiki::pagemtime{$params{page}}\n".
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"size=".length($params{content})."\n"
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);
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# Index document and add terms for other metadata.
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my $tg = Search::Xapian::TermGenerator->new();
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if (! $stemmer) {
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my $langcode=$ENV{LANG} || "en";
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$langcode=~s/_.*//;
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# This whitelist is here to work around a xapian bug (#486138)
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my @whitelist=qw{da de en es fi fr hu it no pt ru ro sv tr};
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if (grep { $_ eq $langcode } @whitelist) {
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$stemmer=Search::Xapian::Stem->new($langcode);
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}
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else {
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$stemmer=Search::Xapian::Stem->new("english");
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}
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}
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$tg->set_stemmer($stemmer);
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$tg->set_document($doc);
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$tg->index_text($params{page}, 2);
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$tg->index_text($caption, 2);
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$tg->index_text($title, 2) if $title ne $caption;
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$tg->index_text($toindex);
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$tg->index_text(lc($title), 1, "S"); # for title:foo
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foreach my $link (@{$links{$params{page}}}) {
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$tg->index_text(lc($link), 1, "XLINK"); # for link:bar
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}
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$doc->add_term($pageterm);
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$db->replace_document_by_term($pageterm, $doc);
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}
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sub delete (@) {
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my $db=xapiandb();
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foreach my $page (@_) {
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my $pageterm=pageterm(pagename($page));
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$db->delete_document_by_term($pageterm) if defined $pageterm;
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}
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}
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sub cgi ($) {
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my $cgi=shift;
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if (defined $cgi->param('P')) {
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# only works for GET requests
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chdir("$config{wikistatedir}/xapian") || error("chdir: $!");
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$ENV{OMEGA_CONFIG_FILE}="./omega.conf";
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$ENV{CGIURL}=$config{cgiurl},
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IkiWiki::loadindex();
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$ENV{HELPLINK}=htmllink("", "", "ikiwiki/searching",
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noimageinline => 1, linktext => "Help");
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exec($config{omega_cgi}) || error("$config{omega_cgi} failed: $!");
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}
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}
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sub pageterm ($) {
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my $page=shift;
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# 240 is the number used by omindex to decide when to hash an
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# overlong term. This does not use a compatible hash method though.
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if (length $page > 240) {
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eval q{use Digest::SHA1};
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if ($@) {
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debug("search: ".sprintf(gettext("need Digest::SHA1 to index %s"), $page)) if $@;
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return undef;
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}
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# Note no colon, therefore it's guaranteed to not overlap
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# with a page with the same name as the hash..
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return "U".lc(Digest::SHA1::sha1_hex($page));
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}
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else {
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return "U:".$page;
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}
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}
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my $db;
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sub xapiandb () {
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if (! defined $db) {
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eval q{
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use Search::Xapian;
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use Search::Xapian::WritableDatabase;
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};
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error($@) if $@;
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$db=Search::Xapian::WritableDatabase->new($config{wikistatedir}."/xapian/default",
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Search::Xapian::DB_CREATE_OR_OPEN());
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}
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return $db;
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}
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{
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my $setup=0;
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sub setupfiles () {
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if (! $setup and (! -e $config{wikistatedir}."/xapian" || $config{rebuild})) {
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writefile("omega.conf", $config{wikistatedir}."/xapian",
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"database_dir .\n".
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"template_dir ./templates\n");
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# Avoid omega interpreting anything in the misctemplate
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# as an omegascript command.
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my $misctemplate=IkiWiki::misctemplate(gettext("search"), "\0");
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eval q{use HTML::Entities};
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error $@ if $@;
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$misctemplate=encode_entities($misctemplate, '\$');
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my $querytemplate=readfile(IkiWiki::template_file("searchquery.tmpl"));
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$misctemplate=~s/\0/$querytemplate/;
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writefile("query", $config{wikistatedir}."/xapian/templates",
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$misctemplate);
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$setup=1;
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}
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}
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}
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1
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