+The [[ikiwiki-calendar]] command is used to force generating year and month
+pages from templates (overriding the existing ones).
+
+## Setup options
+
+* `archivebase` - Default value for [[ikiwiki/directive/calendar]] directive
+ option of the same name.
+* `archive_pagespec` - [[ikiwiki/PageSpec]] of pages to include in the
+ archives, if option `calendar_autocreate` is on. It defaults to `*`.
+* `calendar_autocreate` - Control whether new archive pages are created as
+ needed. It defaults to being done only if option `archivebase` is set.
+* `calendar_fill_gaps` - If set (and `calendar_autocreate` is set as well),
+ build calendar pages of empty years and months (but does not build pages older
+ than the older page, and younger than the younger page of the pagespec). If
+ not, those empty calendar pages will be skipped. *Please note:*
+ * The archive pages will not be automatically updated if this option changes.
+ It is up to the user to delete relevant pages, and rebuild the wiki.
+ * When `calendar_fill_gaps` is set, and a post is deleted, making the
+ corresponding year/month empty, the corresponding page is left, and shows
+ an empty calendar. This is on purpose, not to break any external link
+ pointing to this particular page. If you do not like it, delete the
+ relevant pages, and rebuild the wiki.