avoid stomping on inline's rootpage sub if it's not already present

If the inline plugin is not being loaded, or is perhaps loaded after po
(when IkiWiki::Setup::getsetup loads all the plugins, for example),
po should not inject its custom rootpage sub, as that will lead to a
redefinition error message when inline loads.

1 files changed, 5 insertions, 2 deletions

diff --git a/IkiWiki/Plugin/po.pm b/IkiWiki/Plugin/po.pm
index 4f8d5036e..0ea35b21c 100644
--- a/IkiWiki/Plugin/po.pm
+++ b/IkiWiki/Plugin/po.pm
@@ -66,8 +66,11 @@ sub import {
 		inject(name => "IkiWiki::urlto", call => \&myurlto);
 		$origsubs{'cgiurl'}=\&IkiWiki::cgiurl;
 		inject(name => "IkiWiki::cgiurl", call => \&mycgiurl);
-		$origsubs{'rootpage'}=\&IkiWiki::rootpage;
-		inject(name => "IkiWiki::rootpage", call => \&myrootpage);
+		if (IkiWiki->can('rootpage')) {
+			$origsubs{'rootpage'}=\&IkiWiki::rootpage;
+			inject(name => "IkiWiki::rootpage", call => \&myrootpage)
+				if defined $origsubs{'rootpage'};
+		}
 		$origsubs{'isselflink'}=\&IkiWiki::isselflink;
 		inject(name => "IkiWiki::isselflink", call => \&myisselflink);
 	}