The code runs before anything else -- in particular it runs before
the suid wrapper has sanitized its environment.
+### disable
+
+ hook(type => "disable", id => "foo", call => \&disable);
+
+This hook is only run when a previously enabled plugin gets disabled
+during ikiwiki setup. Plugins can use this to perform cleanups.
+
## Exported variables
Several variables are exported to your plugin when you `use IkiWiki;`