make revert hooks optional

I removed the IkiWiki::rcs_ stubs for the revert hooks. Instead
recentchanges tests to see if the hooks are available and calls
them directly.

4 files changed, 11 insertions, 13 deletions

diff --git a/IkiWiki.pm b/IkiWiki.pm
index faf4af5c7..1f6d70ba3 100644
--- a/IkiWiki.pm
+++ b/IkiWiki.pm
@@ -1941,14 +1941,6 @@ sub rcs_receive () {
 	$hooks{rcs}{rcs_receive}{call}->();
 }
 
-sub rcs_preprevert ($) {
-	$hooks{rcs}{rcs_preprevert}{call}->(@_);
-}
-
-sub rcs_revert ($) {
-	$hooks{rcs}{rcs_revert}{call}->(@_);
-}
-
 sub add_depends ($$;$) {
 	my $page=shift;
 	my $pagespec=shift;
diff --git a/IkiWiki/Plugin/recentchanges.pm b/IkiWiki/Plugin/recentchanges.pm
index 44c981548..a6d7f9fce 100644
--- a/IkiWiki/Plugin/recentchanges.pm
+++ b/IkiWiki/Plugin/recentchanges.pm
@@ -93,7 +93,8 @@ sub sessioncgi ($$) {
 
 	return unless $do eq 'revert' && $rev;
 
-	IkiWiki::rcs_preprevert(cgi => $q, session => $session, rev => $rev);
+	$IkiWiki::hooks{rcs}{rcs_preprevert}{call}->(
+		cgi => $q, session => $session, rev => $rev);
 
 	my ($form, $buttons) = confirmation_form($q, $session);
 	IkiWiki::decode_form_utf8($form);
@@ -101,7 +102,7 @@ sub sessioncgi ($$) {
 	if ($form->submitted eq 'Revert' && $form->validate) {
 		IkiWiki::checksessionexpiry($q, $session, $q->param('sid'));
 		IkiWiki::disable_commit_hook();
-		my $r = IkiWiki::rcs_revert($rev);
+		my $r = $IkiWiki::hooks{rcs}{rcs_revert}{call}->($rev);
 		if (! defined $r) { # success
 			rcs_commit_staged(
 				message => sprintf(gettext("This reverts commit %s"), $rev),
@@ -186,7 +187,9 @@ sub store ($$$) {
 	];
 	push @{$change->{pages}}, { link => '...' } if $is_excess;
 	
-	if (length $config{cgiurl}) {
+	if (length $config{cgiurl} &&
+	    exists $IkiWiki::hooks{rcs}{rcs_preprevert} &&
+	    exists $IkiWiki::hooks{rcs}{rcs_revert}) {
 		$change->{reverturl} = IkiWiki::cgiurl(
 			do => "revert",
 			rev => $change->{rev}
diff --git a/doc/plugins/write.mdwn b/doc/plugins/write.mdwn
index dbbe83851..6b751f0cd 100644
--- a/doc/plugins/write.mdwn
+++ b/doc/plugins/write.mdwn
@@ -1154,8 +1154,6 @@ context, and the whole diff in scalar context.
 This is used to get the page creation time for a file from the RCS, by looking
 it up in the history.
 
-It's ok if this is not implemented, and throws an error.
-
 If the RCS cannot determine a ctime for the file, return 0.
 
 #### `rcs_getmtime($)`
@@ -1210,6 +1208,9 @@ It should try to revert the specified rev, and leave the reversion staged
 so `rcs_commit_staged` will complete it. It should return undef on _success_
 and an error message on failure.
 
+This hook and `rcs_preprevert` are optional, if not implemented, no revert
+web interface will be available.
+
 ### PageSpec plugins
 
 It's also possible to write plugins that add new functions to
diff --git a/templates/change.tmpl b/templates/change.tmpl
index 4525402a7..60a9d94b5 100644
--- a/templates/change.tmpl
+++ b/templates/change.tmpl
@@ -28,9 +28,11 @@
 <span class="changedate"><TMPL_VAR COMMITDATE></span>
 <span class="desc"><br /></span>
 </div>
+<TMPL_IF REVERTURL>
 <span class="revert">
 <a href="<TMPL_VAR REVERTURL>" title="revert" rel="nofollow">[[revert|wikiicons/revert.png]]</a>
 </span>
+</TMPL_IF>
 <div class="changelog">
 <TMPL_LOOP MESSAGE>
 <TMPL_IF LINE>