Hi, by default xapian/omega use locate param from blog.setup to set stemmer language when wiki is indexing.

But, when you search, we use omega cgi, and we not set language, so if you indexing in french, but search in english, you have a bad result.

I propose to set a new param omega_stemmer in blog.setup, to fix the same language when we indexing, and searching. And if omega_stemmer is not set, we use LANG env param.

Bellow, you can find the patch.



        diff --git a/IkiWiki/Plugin/search.pm b/IkiWiki/Plugin/search.pm
        index 42d2e0d..08a0a01 100644
        --- a/IkiWiki/Plugin/search.pm
        +++ b/IkiWiki/Plugin/search.pm
        @@ -33,6 +33,13 @@ sub getsetup () {
                                safe => 0, # external program
                                rebuild => 0,
                        },
        +		omega_stemmer => {
        +			type => "string",
        +			example => "en",
        +			description => "language used for indexing and searching",
        +			safe => 0, # external program
        +			rebuild => 0,
        +		},
         }
         
         sub checkconfig () {
        @@ -136,7 +143,7 @@ sub indexhtml (@) {
                # Index document and add terms for other metadata.
                my $tg = Search::Xapian::TermGenerator->new();
                if (! $stemmer) {
        -		my $langcode=$ENV{LANG} || "en";
        +		my $langcode=$config{omega_stemmer} || $ENV{LANG} || "en";
                        $langcode=~s/_.*//;
         
                        # This whitelist is here to work around a xapian bug (#486138)
        @@ -183,6 +190,18 @@ sub cgi ($) {
                        IkiWiki::loadindex();
                        $ENV{HELPLINK}=htmllink("", "", "ikiwiki/searching",
                                noimageinline => 1, linktext => "Help");
        +		my $langcode=$config{omega_stemmer} || $ENV{LANG} || "en";
        +		$langcode=~s/_.*//;
        +
        +		# This whitelist is here to work around a xapian bug (#486138)
        +		my @whitelist=qw{da de en es fi fr hu it no pt ru ro sv tr};
        +
        +		if (grep { $_ eq $langcode } @whitelist) {
        +                        $ENV{STEMMER}=$langcode;
        +		}
        +		else {
        +                        $ENV{STEMMER}="en";
        +		}
                        exec($config{omega_cgi}) || error("$config{omega_cgi} failed: $!");
                }
         }
        diff --git a/templates/searchquery.tmpl b/templates/searchquery.tmpl
        index 15bc78e..4742460 100644
        --- a/templates/searchquery.tmpl
        +++ b/templates/searchquery.tmpl
        @@ -1,6 +1,6 @@
         $setmap{prefix,title,S}
         $setmap{prefix,link,XLINK}
        -$set{thousand,$.}$set{decimal,.}$setmap{BN,,Any Country,uk,England,fr,France}
        +$set{thousand,$.}$set{decimal,.}$setmap{BN,,Any Country,uk,England,fr,France}$set{stemmer,$env{STEMMER}}
         ${
         $def{PREV,
         $if{$ne{$topdoc,0},<INPUT TYPE=image NAME="&lt;" ALT="&lt;"

Regards,

[[!tag patch]]