I contribute a module that provides additional formatters for the core image and link fields.

To protect the module from uninstall, I need a possibility to check if a providet formatter used on a image or link field.

To do this, I use the hook_system_info_alter() with $info['required'] = TRUE; $info['explanation'] = t('Field formatter(s) in use');

Someone has an idea?

1 Answer 1



See the function dsbox_system_info_alter() of the Drupal Swipebox module to get detailed informations of the solution.
Or, here is the link to the code of the module file: dsbox.module

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