Allow to disable any addon in the addon settings.

lib/ruby_lsp/addon.rb

@@ -78,6 +78,12 @@ def load_addons(global_state, outgoing_queue, include_project_addons: true)
         self.addons = addon_classes.map(&:new)
         self.file_watcher_addons = addons.select { |addon| addon.respond_to?(:workspace_did_change_watched_files) }
 
+        # Disable addons with { "rubyLsp.addonSettings": {"Addon Name": { enabled: false }}}
+        self.addons = addons.filter do |addon|
+          addon_settings = global_state.settings_for_addon(addon.name) || {}
+          addon_settings.fetch(:enabled, true)
+        end
+
         # Activate each one of the discovered add-ons. If any problems occur in the add-ons, we don't want to
         # fail to boot the server
         addons.each do |addon|

test/addon_test.rb

@@ -10,6 +10,7 @@ def setup
         attr_reader :activated, :field, :settings
 
         def initialize
+          @activated = false
           @field = 123
           super
         end
@@ -100,6 +101,10 @@ def activate(global_state, outgoing_queue); end
         def deactivate; end
 
         def workspace_did_change_watched_files(changes); end
+
+        def name
+          "Some Addon"
+        end
       end
 
       Addon.load_addons(@global_state, @outgoing_queue)
@@ -190,5 +195,42 @@ def version
         assert_predicate(addon, :hello)
       end
     end
+
+    def test_disabled_addons_are_not_loaded
+      @global_state = GlobalState.new
+      @global_state.apply_options({
+        initializationOptions: {
+          addonSettings: {
+            "My Add-on": {
+              enabled: false,
+            },
+          },
+        },
+      })
+
+      Addon.load_addons(@global_state, @outgoing_queue)
+
+      assert_raises(Addon::AddonNotFoundError) do
+        Addon.get("My Add-on", "0.1.0")
+      end
+    end
+
+    def test_enabled_addons_are_loaded
+      @global_state = GlobalState.new
+      @global_state.apply_options({
+        initializationOptions: {
+          addonSettings: {
+            "My Add-on": {
+              enabled: true,
+            },
+          },
+        },
+      })
+
+      Addon.load_addons(@global_state, @outgoing_queue)
+
+      addon = Addon.get("My Add-on", "0.1.0")
+      assert_equal("My Add-on", addon.name)
+    end
   end
 end