+sub buildtranslationscache() { #{{{
+ # use istranslation's side-effect
+ map istranslation($_), (keys %pagesources);
+} #}}}
+
+sub resettranslationscache() { #{{{
+ undef %translations;
+} #}}}
+
+sub needsbuild () { #{{{
+ my $needsbuild=shift;
+
+ # backup @needsbuild content so that change() can know whether
+ # a given master page was rendered because its source file was changed
+ @origneedsbuild=(@$needsbuild);
+
+ buildtranslationscache();
+
+ # make existing translations depend on the corresponding master page
+ foreach my $master (keys %translations) {
+ map add_depends($_, $master), values %{otherlanguages($master)};
+ }
+} #}}}
+
+sub scan (@) { #{{{
+ my %params=@_;
+ my $page=$params{page};
+ my $content=$params{content};
+
+ return unless UNIVERSAL::can("IkiWiki::Plugin::link", "import");
+
+ if (istranslation($page)) {
+ foreach my $destpage (@{$links{$page}}) {
+ if (istranslatable($destpage)) {
+ # replace one occurence of $destpage in $links{$page}
+ # (we only want to replace the one that was added by
+ # IkiWiki::Plugin::link::scan, other occurences may be
+ # there for other reasons)
+ for (my $i=0; $i<@{$links{$page}}; $i++) {
+ if (@{$links{$page}}[$i] eq $destpage) {
+ @{$links{$page}}[$i] = $destpage . '.' . lang($page);
+ last;
+ }
+ }
+ }
+ }
+ }
+ elsif (! istranslatable($page) && ! istranslation($page)) {
+ foreach my $destpage (@{$links{$page}}) {
+ if (istranslatable($destpage)) {
+ map {
+ push @{$links{$page}}, $destpage . '.' . $_;
+ } (keys %{$config{po_slave_languages}});
+ }
+ }
+ }
+} #}}}
+
+sub mytargetpage ($$) { #{{{
+ my $page=shift;
+ my $ext=shift;
+
+ if (istranslation($page)) {
+ my ($masterpage, $lang) = (masterpage($page), lang($page));
+ if (! $config{usedirs} || $masterpage eq 'index') {
+ return $masterpage . "." . $lang . "." . $ext;
+ }
+ else {
+ return $masterpage . "/index." . $lang . "." . $ext;
+ }
+ }
+ elsif (istranslatable($page)) {
+ if (! $config{usedirs} || $page eq 'index') {
+ return $page . "." . $config{po_master_language}{code} . "." . $ext;
+ }
+ else {
+ return $page . "/index." . $config{po_master_language}{code} . "." . $ext;
+ }
+ }
+ return $origsubs{'targetpage'}->($page, $ext);
+} #}}}
+
+sub mybeautify_urlpath ($) { #{{{
+ my $url=shift;
+
+ my $res=$origsubs{'beautify_urlpath'}->($url);
+ if ($config{po_link_to} eq "negotiated") {
+ $res =~ s!/\Qindex.$config{po_master_language}{code}.$config{htmlext}\E$!/!;
+ }
+ return $res;
+} #}}}
+
+sub urlto_with_orig_beautiful_urlpath($$) { #{{{
+ my $to=shift;
+ my $from=shift;
+
+ inject(name => "IkiWiki::beautify_urlpath", call => $origsubs{'beautify_urlpath'});
+ my $res=urlto($to, $from);
+ inject(name => "IkiWiki::beautify_urlpath", call => \&mybeautify_urlpath);
+
+ return $res;
+} #}}}
+
+sub myurlto ($$;$) { #{{{
+ my $to=shift;
+ my $from=shift;
+ my $absolute=shift;
+
+ # workaround hard-coded /index.$config{htmlext} in IkiWiki::urlto()
+ if (! length $to
+ && $config{po_link_to} eq "current"
+ && istranslation($from)
+ && istranslatable('index')) {
+ return IkiWiki::beautify_urlpath(IkiWiki::baseurl($from) . "index." . lang($from) . ".$config{htmlext}");
+ }
+ return $origsubs{'urlto'}->($to,$from,$absolute);
+} #}}}
+
+sub mybestlink ($$) { #{{{
+ my $page=shift;
+ my $link=shift;
+
+ my $res=$origsubs{'bestlink'}->($page, $link);
+ if (length $res) {
+ if ($config{po_link_to} eq "current"
+ && istranslatable($res)
+ && istranslation($page)) {
+ return $res . "." . lang($page);
+ }
+ else {
+ return $res;
+ }
+ }
+ return "";
+} #}}}
+
+# blackbox for %filtered
+{
+ my %filtered;
+
+ sub alreadyfiltered($$) { #{{{
+ my $page=shift;
+ my $destpage=shift;
+
+ return ( exists $filtered{$page}{$destpage}
+ && $filtered{$page}{$destpage} eq 1 );
+ } #}}}
+
+ sub setalreadyfiltered($$) { #{{{
+ my $page=shift;
+ my $destpage=shift;
+
+ $filtered{$page}{$destpage}=1;
+ } #}}}
+
+ sub unsetalreadyfiltered($$) { #{{{
+ my $page=shift;
+ my $destpage=shift;
+
+ if (exists $filtered{$page}{$destpage}) {
+ delete $filtered{$page}{$destpage};
+ }
+ } #}}}
+
+ sub resetalreadyfiltered() { #{{{
+ undef %filtered;
+ } #}}}
+}
+
+# We use filter to convert PO to the master page's format,
+# since the rest of ikiwiki should not work on PO files.