Expose an API for plugins to be hidden on the admin plugin page.

app/controllers/admin/plugins_controller.rb

@@ -1,7 +1,7 @@
 class Admin::PluginsController < Admin::AdminController
 
   def index
-    render_serialized(Discourse.plugins, AdminPluginSerializer, root: 'plugins')
+    render_serialized(Discourse.display_plugins, AdminPluginSerializer, root: 'plugins')
   end
 
 end

lib/discourse.rb

@@ -164,6 +164,14 @@ module Discourse
     @plugins ||= []
   end
 
+  def self.hidden_plugins
+    @hidden_plugins ||= []
+  end
+
+  def self.display_plugins
+    self.plugins - self.hidden_plugins
+  end
+
   def self.plugin_themes
     @plugin_themes ||= plugins.map(&:themes).flatten
   end

lib/plugin/instance.rb

@@ -493,6 +493,10 @@ JS
     PluginGem.load(path, name, version, opts)
   end
 
+  def hide_plugin
+    Discourse.hidden_plugins << self
+  end
+
   def enabled_site_setting_filter(filter = nil)
     if filter
       @enabled_setting_filter = filter