rcs plugin loading reorg

Move rcs plugin load to loadplugins; move duplicate rcs detection logic out
of individual plugins and into loadplugins. Avoids checkconfig failing when
run twice.

IkiWiki.pm

@@ -413,13 +413,6 @@ sub checkconfig () { #{{{
 	$config{wikistatedir}="$config{srcdir}/.ikiwiki"
 		unless exists $config{wikistatedir};
 
-	if ($config{rcs}) {
-		loadplugin($config{rcs});
-	}
-	else {
-		loadplugin("norcs");
-	}
-
 	if (defined $config{umask}) {
 		umask(possibly_foolish_untaint($config{umask}));
 	}
@@ -456,6 +449,16 @@ sub loadplugins () { #{{{
 
 	loadplugin($_) foreach @{$config{default_plugins}}, @{$config{add_plugins}};
 	
+	if ($config{rcs}) {
+		if (exists $IkiWiki::hooks{rcs}) {
+			error(gettext("cannot use multiple rcs plugins"));
+		}
+		loadplugin($config{rcs});
+	}
+	if (! exists $IkiWiki::hooks{rcs}) {
+		loadplugin("norcs");
+	}
+
 	run_hooks(getopt => sub { shift->() });
 	if (grep /^-/, @ARGV) {
 		print STDERR "Unknown option: $_\n"

IkiWiki/Plugin/bzr.pm

@@ -8,9 +8,6 @@ use Encode;
 use open qw{:utf8 :std};
 
 sub import { #{{{
-	if (exists $IkiWiki::hooks{rcs}) {
-		error(gettext("cannot use multiple rcs plugins"));
-	}
 	hook(type => "checkconfig", id => "bzr", call => \&checkconfig);
 	hook(type => "getsetup", id => "bzr", call => \&getsetup);
 	hook(type => "rcs", id => "rcs_update", call => \&rcs_update);

IkiWiki/Plugin/git.pm

@@ -11,9 +11,6 @@ my $sha1_pattern     = qr/[0-9a-fA-F]{40}/; # pattern to validate Git sha1sums
 my $dummy_commit_msg = 'dummy commit';      # message to skip in recent changes
 
 sub import { #{{{
-	if (exists $IkiWiki::hooks{rcs}) {
-		error(gettext("cannot use multiple rcs plugins"));
-	}
 	hook(type => "checkconfig", id => "git", call => \&checkconfig);
 	hook(type => "getsetup", id => "git", call => \&getsetup);
 	hook(type => "rcs", id => "rcs_update", call => \&rcs_update);

IkiWiki/Plugin/mercurial.pm

@@ -8,9 +8,6 @@ use Encode;
 use open qw{:utf8 :std};
 
 sub import { #{{{
-	if (exists $IkiWiki::hooks{rcs}) {
-		error(gettext("cannot use multiple rcs plugins"));
-	}
 	hook(type => "checkconfig", id => "mercurial", call => \&checkconfig);
 	hook(type => "getsetup", id => "mercurial", call => \&getsetup);
 	hook(type => "rcs", id => "rcs_update", call => \&rcs_update);

IkiWiki/Plugin/monotone.pm

@@ -11,9 +11,6 @@ use Date::Format qw(time2str);
 my $sha1_pattern = qr/[0-9a-fA-F]{40}/; # pattern to validate sha1sums
 
 sub import { #{{{
-	if (exists $IkiWiki::hooks{rcs}) {
-		error(gettext("cannot use multiple rcs plugins"));
-	}
 	hook(type => "checkconfig", id => "monotone", call => \&checkconfig);
 	hook(type => "getsetup", id => "monotone", call => \&getsetup);
 	hook(type => "rcs", id => "rcs_update", call => \&rcs_update);

IkiWiki/Plugin/svn.pm

@@ -7,9 +7,6 @@ use IkiWiki;
 use POSIX qw(setlocale LC_CTYPE);
 
 sub import { #{{{
-	if (exists $IkiWiki::hooks{rcs}) {
-		error(gettext("cannot use multiple rcs plugins"));
-	}
 	hook(type => "checkconfig", id => "svn", call => \&checkconfig);
 	hook(type => "getsetup", id => "svn", call => \&getsetup);
 	hook(type => "rcs", id => "rcs_update", call => \&rcs_update);

IkiWiki/Plugin/tla.pm

@@ -6,9 +6,6 @@ use strict;
 use IkiWiki;
 
 sub import { #{{{
-	if (exists $IkiWiki::hooks{rcs}) {
-		error(gettext("cannot use multiple rcs plugins"));
-	}
 	hook(type => "checkconfig", id => "tla", call => \&checkconfig);
 	hook(type => "getsetup", id => "tla", call => \&getsetup);
 	hook(type => "rcs", id => "rcs_update", call => \&rcs_update);