websetup: Allow enabling plugins listed in disable_plugins.

The bug here was that disabling a plugin included thru goodstuff, like
htmlscrubber, caused it to be added to disable_plugins, and those plugins
were never loaded, so could not be re-enabled. Fix by allowing them to be
force loaded when appropriate. (Also that allows disabled plugins to still
record their setup options when dumping a setup file.)

IkiWiki.pm

@@ -592,10 +592,11 @@ sub loadplugins () {
 	return 1;
 }
 
-sub loadplugin ($) {
+sub loadplugin ($;$) {
 	my $plugin=shift;
+	my $force=shift;
 
-	return if grep { $_ eq $plugin} @{$config{disable_plugins}};
+	return if ! $force && grep { $_ eq $plugin} @{$config{disable_plugins}};
 
 	foreach my $dir (defined $config{libdir} ? possibly_foolish_untaint($config{libdir}) : undef,
 	                 "$installdir/lib/ikiwiki") {

IkiWiki/Setup.pm

@@ -123,7 +123,7 @@ sub getsetup () {
 	# Load all plugins, so that all setup options are available.
 	my @plugins=IkiWiki::listplugins();
 	foreach my $plugin (@plugins) {
-		eval { IkiWiki::loadplugin($plugin) };
+		eval { IkiWiki::loadplugin($plugin, 1) };
 		if (exists $IkiWiki::hooks{checkconfig}{$plugin}{call}) {
 			my @s=eval { $IkiWiki::hooks{checkconfig}{$plugin}{call}->() };
 		}

debian/changelog

@@ -12,6 +12,7 @@ ikiwiki (3.20100611) UNRELEASED; urgency=low
     else (still looks in old location for backwards compatability).
   * attachment: When inserting links, insert img directives for images,
     if that plugin is enabled.
+  * websetup: Allow enabling plugins listed in disable_plugins.
 
  -- Joey Hess <joeyh@debian.org>  Fri, 11 Jun 2010 13:39:15 -0400