This is the standard ngettext function, although slightly optimised.
-### `urlto($$;$)`
+### `urlto($;$$)`
Construct a relative url to the first parameter from the page named by the
second. The first parameter can be either a page name, or some other
destination file, as registered by `will_render`.
+If the second parameter is `undef` (or not specified), the URL will be
+valid from any page on the wiki, or from the CGI; if possible it'll
+be a path starting with `/`, but an absolute URL will be used if
+the wiki and the CGI are on different domains.
+
If the third parameter is passed and is true, an absolute url will be
constructed instead of the default relative url.
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($)`
for the RCS to limit changes to safe changes, and die if a change would
be unsafe to revert.
-#### `rcs_revert(@)`
+#### `rcs_revert($)`
This is called by the revert web interface. It is passed a named
parameter rev that is the RCS-specific change ID to revert.
-Addition named parameters: `message`, and `session` (optional).
-
-It should try to revert the specified rev, which includes committing
-the reversion, and returns undef on _success_ and an error message
-on failure.
-
-#### `rcs_showpatch(@)`
+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 is passed a named parameter rev that is a RCS-specific
-change ID. It should generate a diff-style patch showing the changes
-made and return it.
+This hook and `rcs_preprevert` are optional, if not implemented, no revert
+web interface will be available.
### PageSpec plugins