Fixes #3058 pulls likes out as a plugin

git-svn-id: http://code.elgg.org/elgg/trunk@8639 36083f99-b078-4883-b0ff-0f9b5a30f544

1 files changed, 104 insertions, 0 deletions

diff --git a/mod/likes/start.php b/mod/likes/start.php
new file mode 100644
index 000000000..97823087a
--- /dev/null
+++ b/mod/likes/start.php
@@ -0,0 +1,104 @@
+<?php
+/**
+ * Likes plugin
+ * 
+ */
+
+elgg_register_event_handler('init', 'system', 'likes_init');
+
+function likes_init() {
+
+	elgg_extend_view('css/elgg', 'likes/css');
+
+	// registered with priority < 500 so other plugins can remove likes
+	elgg_register_plugin_hook_handler('register', 'menu:river', 'likes_river_menu_setup', 400);
+	elgg_register_plugin_hook_handler('register', 'menu:entity', 'likes_entity_menu_setup', 400);
+
+	$actions_base = elgg_get_plugins_path() . 'likes/actions/likes';
+	elgg_register_action('likes/add', "$actions_base/add.php");
+	elgg_register_action('likes/delete', "$actions_base/delete.php");
+}
+
+/**
+ * Add likes to entity menu at end of the menu
+ */
+function likes_entity_menu_setup($hook, $type, $return, $params) {
+	if (elgg_in_context('widgets')) {
+		return $return;
+	}
+
+	$entity = $params['entity'];
+
+	// likes
+	$options = array(
+		'name' => 'likes',
+		'text' => elgg_view('likes/display', array('entity' => $entity)),
+		'href' => false,
+		'priority' => 1000,
+	);
+	$return[] = ElggMenuItem::factory($options);
+
+	return $return;
+}
+
+/**
+ * Add a like button to river actions
+ */
+function likes_river_menu_setup($hook, $type, $return, $params) {
+	if (elgg_is_logged_in()) {
+		$item = $params['item'];
+		$object = $item->getObjectEntity();
+		if (!elgg_in_context('widgets') && $item->annotation_id == 0) {
+			if ($object->canAnnotate(0, 'likes')) {
+				if (!elgg_annotation_exists($object->getGUID(), 'likes')) {
+					// user has not liked this yet
+					$url = "action/likes/add?guid={$object->getGUID()}";
+					$options = array(
+						'name' => 'like',
+						'href' => $url,
+						'text' => elgg_echo('likes:likethis'),
+						'is_action' => true,
+						'priority' => 100,
+					);
+				} else {
+					// user has liked this
+					$likes = elgg_get_annotations(array(
+						'guid' => $guid,
+						'annotation_name' => 'likes',
+						'owner_guid' => elgg_get_logged_in_user_guid()
+					));
+					$url = elgg_get_site_url() . "action/likes/delete?annotation_id={$likes[0]->id}";
+					$options = array(
+						'name' => 'like',
+						'href' => $url,
+						'text' => elgg_echo('likes:remove'),
+						'is_action' => true,
+						'priority' => 100,
+					);
+				}
+				$return[] = ElggMenuItem::factory($options);
+			}
+		}
+	}
+
+	return $return;
+}
+
+/**
+ * Count how many people have liked an entity.
+ *
+ * @param  ElggEntity $entity 
+ *
+ * @return int Number of likes
+ */
+function likes_count($entity) {
+	$type = $entity->getType();
+	$params = array('entity' => $entity);
+	$number = elgg_trigger_plugin_hook('likes:count', $type, $params, false);
+
+	if ($number) {
+		return $number;
+	} else {
+		return $entity->countAnnotations('likes');
+	}
+}