This hook is called to convert [[WikiLinks|WikiLink]] on the page into html
links. The function is passed named parameters "page", "destpage", and
-"content". It should return the linkified content.
+"content". It should return the linkified content. Present in IkiWiki 2.40
+and later.
Plugins that implement linkify must also implement a scan hook, that scans
for the links on the page and adds them to `%links`.
This hook is called early in the process of building the wiki, and is used
as a first pass scan of the page, to collect metadata about the page. It's
mostly used to scan the page for WikiLinks, and add them to `%links`.
+Present in IkiWiki 2.40 and later.
The function is passed named parameters "page" and "content". Its return
value is ignored.
use `%pagestate{$page}{$id}{$key}=$value`, and to retrieve the value,
use `%pagestate{$page}{$id}{$key}`.
-`$key` can be any string you like, but `$id` must be the same as the "id"
-parameter passed to `hook()` when registering the plugin. This is so
-ikiwiki can know when to delete pagestate for plugins that are no longer
-used.
+The `$value` can be anything that perl's Storable module is capable of
+serializing. `$key` can be any string you like, but `$id` must be the same
+as the "id" parameter passed to `hook()` when registering the plugin. This
+is so ikiwiki can know when to delete pagestate for plugins that are no
+longer used.
When pages are deleted, ikiwiki automatically deletes their pagestate too.
Given the name of a source file, returns the name of the wiki page
that corresponds to that file.
-#### `srcfile($)`
+#### `srcfile($;$)`
Given the name of a source file in the wiki, searches for the file in
the source directory and the underlay directories (most recently added
underlays first), and returns the full path to the first file found.
+Normally srcfile will fail with an error message if the source file cannot
+be found. The second parameter can be set to a true value to make it return
+undef instead.
+
#### `add_underlay($)`
Adds a directory to the set of underlay directories that ikiwiki will