X-Git-Url: http://git.vanrenterghem.biz/git.ikiwiki.info.git/blobdiff_plain/22d982243716bb04f56e4e78e573e3ec49077309..ae1857b43cf55a393a507b8434f172cbdb29d5b0:/doc/plugins/write.mdwn

diff --git a/doc/plugins/write.mdwn b/doc/plugins/write.mdwn
index 335320394..9a5ca60a0 100644
--- a/doc/plugins/write.mdwn
+++ b/doc/plugins/write.mdwn
@@ -1,4 +1,4 @@
-Ikiwiki's plugin interface allows all kinds of useful [[plugins]] to be
+lkiwiki's plugin interface allows all kinds of useful [[plugins]] to be
 written to extend ikiwiki in many ways. Despite the length of this page,
 it's not really hard. This page is a complete reference to everything a
 plugin might want to do. There is also a quick [[tutorial]].
@@ -177,10 +177,15 @@ function is passed no values.
 
 	hook(type => "needsbuild", id => "foo", call => \&needsbuild);
 
-This allows a plugin to manipulate the list of files that need to be
-built when the wiki is refreshed. The function is passed a reference to an
-array of files that will be rebuilt, and can modify the array, either
-adding or removing files from it.
+This allows a plugin to observe or even manipulate the list of files that
+need to be built when the wiki is refreshed. 
+
+As its first parameter, the function is passed a reference to an array of
+files that will be built. It should return an array reference that is a
+modified version of its input. It can add or remove files from it.
+
+The second parameter passed to the function is a reference to an array of
+files that have been deleted.
 
 ### scan
 
@@ -194,17 +199,6 @@ them to `%links`. Present in IkiWiki 2.40 and later.
 The function is passed named parameters "page" and "content". Its return
 value is ignored.
 
-### rescan
-
-	hook(type => "rescan", id => "foo", call => \&scan);
-
-This hook is called after the scan hook has been run, as well as the
-preprocess hook in scan mode. It is used to collect additional
-metadata that depends on a first scan to have been performed already.
-
-The function is passed named parameters "page" and "content". Its return
-value is ignored.
-
 ### filter
 
 	hook(type => "filter", id => "foo", call => \&filter);
@@ -586,6 +580,7 @@ describes the plugin as a whole. For example:
 * `description` is a short description of the option.
 * `link` is a link to further information about the option. This can either
   be a [[ikiwiki/WikiLink]], or an url.
+* `htmldescription` is displayed instead of the description by websetup.
 * `advanced` can be set to true if the option is more suitable for advanced
   users.
 * `safe` should be false if the option should not be displayed in unsafe
@@ -746,6 +741,8 @@ with no ".tmpl" extension. Template pages are normally looked for in
 the templates/ directory. If the page name starts with "/", a page
 elsewhere in the wiki can be used.
 
+If the template is not found, or contains a syntax error, an error is thrown.
+
 ### `template_depends($$;@)`
 
 Use this instead of `template()` if the content of a template is being
@@ -986,14 +983,22 @@ This is the standard gettext function, although slightly optimised.
 
 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 third parameter is passed and is true, an absolute url will be
-constructed instead of the default relative url.
+Provide a second parameter whenever possible, since this leads to better
+behaviour for the [[plugins/po]] plugin and `file:///` URLs.
+
+If the second parameter is not specified (or `undef`), 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, the url will be a fully
+absolute url. This is useful when generating an url to publish elsewhere.
 
 ### `newpagefile($$)`
 
@@ -1147,19 +1152,19 @@ The data structure returned for each change is:
 		],
 	}
 
-#### `rcs_diff($)`
+#### `rcs_diff($;$)`
+
+The first parameter is the rev from `rcs_recentchanges`.
+The optional second parameter is how many lines to return (default: all).
 
-The parameter is the rev from `rcs_recentchanges`.
 Should return a list of lines of the diff (including \n) in list
-context, and the whole diff in scalar context.
+context, and a string containing the whole diff in scalar context.
 
 #### `rcs_getctime($)`
 
 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($)`
@@ -1180,9 +1185,9 @@ sense to implement for all RCSs.
 
 It should examine the incoming changes, and do any sanity 
 checks that are appropriate for the RCS to limit changes to safe file adds,
-removes, and changes. If something bad is found, it should exit
-nonzero, to abort the push. Otherwise, it should return a list of
-files that were changed, in the form:
+removes, and changes. If something bad is found, it should die, to abort
+the push. Otherwise, it should return a list of files that were changed,
+in the form:
 
 	{
 		file => # name of file that was changed
@@ -1195,6 +1200,28 @@ files that were changed, in the form:
 The list will then be checked to make sure that each change is one that
 is allowed to be made via the web interface.
 
+#### `rcs_preprevert($)`
+
+This is called by the revert web interface. It is passed a RCS-specific
+change ID, and should determine what the effects would be of reverting
+that change, and return the same data structure as `rcs_receive`.
+
+Like `rcs_receive`, it should do whatever sanity checks are appropriate
+for the RCS to limit changes to safe changes, and die if a change would
+be unsafe to revert.
+
+#### `rcs_revert($)`
+
+This is called by the revert web interface. It is passed a named
+parameter rev that is the RCS-specific change ID to revert.
+
+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