civicoop/wpcivi-shared

Wordpress plugin that contains shared, reusable code for Wordpress <-> CiviCRM integration.
It includess:

• A WPCiviAPI class that is used by all other functions and custom plugins to access the
  CiviCRM API. It supports both local and remote installs. There are also some useful utility functions and temporary caches in the Util\... classes.

• Base classes that make handling Gravity Forms submissions possible. It isn't possible to configure handlers dynamically in the WordPress admin (yet): every different form requires creating a FormHandler class that extends BaseFormHandler. You can then select the handler you want to use for a form on the form's settings page. The actual custom handlers used are separated into a per-site plugin.

• Entity classes for all CiviCRM Entities that are currently accessed or changed by our custom modules. These classes represent a single CiviCRM Entity (Contact, Email, Membership) and wrap around the CiviCRM API (for example, calling $contact->save() results in a call to Contact.Create({...})). A search should return a EntityCollection that contains an array of Entity classes.

• Base widgets that are meant to be added to Advanced Custom Fields' Flexible Content layouts. This is currently a first implementation that only allows selecting a widget type dynamically. Support for WordPress core widgets and short codes might be added in the future.

• Basic plugin and theme functions that can be extended by other classes.
  And a PSR-4 autoloader to try and introduce some sanity into WordPress.

If this all sounds rather vague: we'll add some example widgets and code in the future. In the meantime, check out the implementation code in the wpcivi-jourcoop plugin to get a clearer idea of how this works.

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Note for those interested in WP+Civi integration:
The description about the CiviCRM Entity classes above may remind you of the civicrm_entity module in Drupal. A similiar kind of deep integration between WordPress and CiviCRM would open up a lot of possibilities for end-users who aren't developers, and save a lot of development work in the long run.
This module is not quite there yet: it's just a first, very provisional, attempt to allow easier access to CiviCRM data from WordPress. A next step might be trying to model the Entity and EntityCollection classes on \WP_Post and \WP_Query. In the future, Entity types could be matched to custom post types; QueryWrangler could work as a WP alternative for Views; and integration with the Advanced Custom Fields plugin and form plugins like Gravity Forms would provide even more useful functionality.
(However, all that may take more than a few hours of development work :-) - and there are a lot of possible use cases and complications. The first one is that the WP_Query class that is central to WordPress only works with wp_posts_* tables and is very difficult to extend.)