[Tapioca Add-on] Trigger DSL generation upon file changes

Gemfile

@@ -15,8 +15,8 @@ gem "irb"
 gem "rubocop-shopify"
 gem "rubocop-sorbet", ">= 0.4.1"
 gem "rubocop-rspec"
-gem "ruby-lsp", ">= 0.19.0"
-gem "ruby-lsp-rails", ">= 0.3.17"
+gem "ruby-lsp", ">= 0.19.1"
+gem "ruby-lsp-rails", ">= 0.3.18"
 
 group :deployment, :development do
   gem "rake"

Gemfile.lock

@@ -303,12 +303,12 @@ GEM
       rubocop (~> 1.51)
     rubocop-sorbet (0.8.5)
       rubocop (>= 1)
-    ruby-lsp (0.19.0)
+    ruby-lsp (0.19.1)
       language_server-protocol (~> 3.17.0)
       prism (>= 1.1, < 2.0)
       rbs (>= 3, < 4)
       sorbet-runtime (>= 0.5.10782)
-    ruby-lsp-rails (0.3.17)
+    ruby-lsp-rails (0.3.18)
       ruby-lsp (>= 0.19.0, < 0.20.0)
     ruby-progressbar (1.13.0)
     shopify-money (3.0.0)
@@ -394,8 +394,8 @@ DEPENDENCIES
   rubocop-rspec
   rubocop-shopify
   rubocop-sorbet (>= 0.4.1)
-  ruby-lsp (>= 0.19.0)
-  ruby-lsp-rails (>= 0.3.17)
+  ruby-lsp (>= 0.19.1)
+  ruby-lsp-rails (>= 0.3.18)
   shopify-money
   sidekiq
   smart_properties

lib/ruby_lsp/tapioca/addon.rb

@@ -1,7 +1,7 @@
 # typed: strict
 # frozen_string_literal: true
 
-RubyLsp::Addon.depend_on_ruby_lsp!(">= 0.19", "< 0.20")
+RubyLsp::Addon.depend_on_ruby_lsp!(">= 0.19.1", "< 0.20")
 
 begin
   # The Tapioca add-on depends on the Rails add-on to add a runtime component to the runtime server. We can allow the
@@ -25,13 +25,15 @@ def initialize
 
         @global_state = T.let(nil, T.nilable(RubyLsp::GlobalState))
         @rails_runner_client = T.let(nil, T.nilable(RubyLsp::Rails::RunnerClient))
+        @index = T.let(nil, T.nilable(RubyIndexer::Index))
       end
 
       sig { override.params(global_state: RubyLsp::GlobalState, outgoing_queue: Thread::Queue).void }
       def activate(global_state, outgoing_queue)
         @global_state = global_state
         return unless @global_state.experimental_features
 
+        @index = @global_state.index
         Thread.new do
           # Get a handle to the Rails add-on's runtime client. The call to `rails_runner_client` will block this thread
           # until the server has finished booting, but it will not block the main LSP. This has to happen inside of a
@@ -60,6 +62,24 @@ def version
 
       sig { params(changes: T::Array[{ uri: String, type: Integer }]).void }
       def workspace_did_change_watched_files(changes)
+        constants = changes.flat_map do |change|
+          path = URI(change[:uri]).to_standardized_path
+          entries = T.must(@index).entries_for(path)
+          next unless entries
+
+          entries.filter_map do |entry|
+            entry.name if entry.class == RubyIndexer::Entry::Class || entry.class == RubyIndexer::Entry::Module
+          end
+        end
+
+        return if constants.empty?
+
+        T.must(@rails_runner_client).trigger_reload
+        T.must(@rails_runner_client).delegate_notification(
+          server_addon_name: "Tapioca",
+          request_name: "dsl",
+          params: { constants: constants },
+        )
       end
     end
   end