Extensions in SeedDMS
====================

Since verson 5.0.0 SeedDMS can be extended by extensions. Extensions
can hook up functions into certain operations, e.g.
uploading, removing or displaying a document. They can also be
used to modify some of the internal variables like the list of
translations.

All extensions are located in the folder 'ext'. Each extension
has its own folder named by the name of the extension. The central
configuration of an extension is stored in conf.php.
The configuration sets the file and classname which is loaded
during initialization of the extension. The class has to have
a method init() which is called with any page request. The
configuration itself is cached and must be updated within
the extension manager if it was changed.

The integration into SeedDMS is done by hooks. SeedDMS manages
a globally available array of hooks ($GLOBALS['SEEDDMS_HOOKS']).
This array has the elements 'view' and 'controller'. All entries
in those array elements contain instances of self defined classes
containing the hook methods. For setting up the hooks in the view
'viewFolder' the following code is needed.

$GLOBALS['SEEDDMS_HOOKS']['view']['viewFolder'][] = new SeedDMS_ExtExample_ViewFolder;

class SeedDMS_ExtExample_ViewFolder {
  ...
};