po: use rescan hook instead of rebuilding twice.

The po rescan hook re-runs the scan hooks, and runs the preprocess ones in scan
mode, both on the po-to-markup converted content. This way, plugins such as meta
are given a chance to gather correct information, rather than ugly/buggy escaped
data it did gather from unconverted PO files.

diff --git a/IkiWiki/Plugin/po.pm b/IkiWiki/Plugin/po.pm
index 6395ebdc2f99f91e3316b89cb017d157e895f81b..519b6d12cb33f29601b92a286a009dee1428dba5 100644 (file)
--- a/IkiWiki/Plugin/po.pm
+++ b/IkiWiki/Plugin/po.pm
@@ -39,6 +39,7 @@ sub import {
        hook(type => "checkconfig", id => "po", call => \&checkconfig);
        hook(type => "needsbuild", id => "po", call => \&needsbuild);
        hook(type => "scan", id => "po", call => \&scan, last => 1);
+       hook(type => "rescan", id => "po", call => \&rescan);
        hook(type => "filter", id => "po", call => \&filter);
        hook(type => "htmlize", id => "po", call => \&htmlize);
        hook(type => "pagetemplate", id => "po", call => \&pagetemplate, last => 1);
@@ -272,6 +273,27 @@ sub filter (@) {
        return $content;
 }
 
+# re-run the scan hooks and run the preprocess ones in scan
+# mode on the po-to-markup converted content
+sub rescan (@) {
+       my %params=@_;
+       my $page=$params{page};
+       my $content=$params{content};
+
+       return unless exists $config{rebuild} && $config{rebuild};
+       return unless istranslation($page);
+
+       $content = po_to_markup($page, $content);
+       require IkiWiki;
+       IkiWiki::run_hooks(scan => sub {
+               shift->(
+                       page => $page,
+                       content => $content,
+               );
+       });
+       IkiWiki::preprocess($page, $page, $content, 1);
+}
+
 sub htmlize (@) {
        my %params=@_;
 
@@ -384,41 +406,6 @@ sub mydelete (@) {
 sub change (@) {
        my @rendered=@_;
 
-       # All meta titles are first extracted at scan time, i.e. before we turn
-       # PO files back into translated markdown; escaping of double-quotes in
-       # PO files breaks the meta plugin's parsing enough to save ugly titles
-       # to %pagestate at this time.
-       #
-       # Then, at render time, every page passes in turn through the Great
-       # Rendering Chain (filter->preprocess->linkify->htmlize), and the meta
-       # plugin's preprocess hook is this time in a position to correctly
-       # extract the titles from slave pages.
-       #
-       # This is, unfortunately, too late: if the page A, linking to the page
-       # B, is rendered before B, it will display the wrongly-extracted meta
-       # title as the link text to B.
-       #
-       # On the one hand, such a corner case only happens on rebuild: on
-       # refresh, every rendered page is fixed to contain correct meta titles.
-       # On the other hand, it can take some time to get every page fixed.
-       # We therefore re-render every rendered page after a rebuild to fix them
-       # at once. As this more or less doubles the time needed to rebuild the
-       # wiki, we do so only when really needed.
-
-       if (@rendered
-           && exists $config{rebuild} && defined $config{rebuild} && $config{rebuild}
-           && UNIVERSAL::can("IkiWiki::Plugin::meta", "getsetup")
-           && exists $config{meta_overrides_page_title}
-           && defined $config{meta_overrides_page_title}
-           && $config{meta_overrides_page_title}) {
-               debug(sprintf(gettext("rebuilding all pages to fix meta titles")));
-               resetalreadyfiltered();
-               require IkiWiki::Render;
-               foreach my $file (@rendered) {
-                       IkiWiki::render($file, sprintf(gettext("building %s"), $file));
-               }
-       }
-
        my $updated_po_files=0;
 
        # Refresh/create POT and PO files as needed.