and undef if a rebuild could be needed in some circumstances, but is not
strictly required.
+### targetpage
+
+ hook(type => "targetpage", id => "foo", call => \&targetpage);
+
+This hook can be used to override the name of the file a page should
+be compiled into.
+
+It should return the target filename.
+
+### tweakurlpath
+
+ hook(type => "tweakurlpath", id => "foo", call => \&tweakurlpath);
+
+This hook can be used to modify the internal urls generated by
+ikiwiki; it is run just after ikiwiki has removed the trailing
+`index.html`, in case `usedirs` is enabled.
+
+It should return the modified url.
+
+### tweakbestlink
+
+ hook(type => "tweakbestlink", id => "foo", call => \&tweakbestlink);
+
+This hook can be used to modify the page returned by `bestlink`. It is
+passed named parameters `page` and `link`. These are, respectively,
+the page where the link will appear and the link ikiwiki would choose
+as the best one, if no `tweakbestlink` hook was in effect.
+
+It should return the modified link.
+
## Plugin interface
To import the ikiwiki plugin interface:
By the way, to parse a ikiwiki setup file and populate `%config`, a
program just needs to do something like:
`use IkiWiki::Setup; IkiWiki::Setup::load($filename)`
+
+### Javascript
+
+Some plugins use javascript to make ikiwiki look a bit more web-2.0-ish.
+
+All javascript code should be put in `.js` files in the `javascript`
+underlay, and plugins using those files can enable use of the underlay by
+calling `add_underlay("javascript");` in their `import` function.
+
+You'll have to arrange for `<script>` tags to be added to the pages that
+use your javascript. This can be done using a `format` hook.
+
+Ikiwiki provides some utility functions in `ikiwiki.js`, for use by other
+javascript code. These include:
+
+#### `getElementsByClass(cls, node, tag)`
+
+Returns an array of elements with the given class. The node and tag are
+optional and define what document node and element names to search.
+
+#### `hook(name, call)`
+
+The function `call` will be run as part of the hook named `name`.
+
+Note that to hook into `window.onload`, you can use the `onload' hook.
+
+#### `run_hooks(name)`
+
+Runs the hooks with the specified name.