po: fix bug with translated pages including templates

The protection against processing loops (i.e. the alreadyfiltered stuff) was
playing against us: the template plugin triggered a filter hooks run with the
very same ($page, $destpage) arguments pair that we use to identify a already
filtered page. Processing an included template could then mark the whole
translation page as already filtered, which prevented po_to_markup to be called
on the PO content.

This commit only runs the whole PO filter logic when our filter hook is run by
IkiWiki::render, which only happens when the full page needs to be filtered.

1 files changed, 4 insertions, 0 deletions

diff --git a/IkiWiki/Plugin/po.pm b/IkiWiki/Plugin/po.pm
index 3023fd7f9..0b48726ea 100644
--- a/IkiWiki/Plugin/po.pm
+++ b/IkiWiki/Plugin/po.pm
@@ -243,6 +243,10 @@ sub filter (@) {
 	my $page = $params{page};
 	my $destpage = $params{destpage};
 	my $content = $params{content};
+
+	my @caller = caller(4);
+        return $content unless $caller[3] ne "IkiWiki::render";
+
 	if (istranslation($page) && ! alreadyfiltered($page, $destpage)) {
 		$content = po_to_markup($page, $content);
 		setalreadyfiltered($page, $destpage);