Add a basic RubyLSP dependencies custom request

lib/ruby_lsp/executor.rb

@@ -222,6 +222,8 @@ def run(request)
         workspace_symbol(request.dig(:params, :query))
       when "rubyLsp/textDocument/showSyntaxTree"
         show_syntax_tree(uri, request.dig(:params, :range))
+      when "rubyLsp/workspace/dependencies"
+        workspace_dependencies
       else
         VOID
       end
@@ -252,6 +254,22 @@ def did_change_watched_files(changes)
       VOID
     end
 
+    sig { returns(T::Array[T::Hash[Symbol, T.untyped]]) }
+    def workspace_dependencies
+      definition = Bundler.definition
+      dep_keys = definition.locked_deps.keys.to_set
+      definition.specs.map do |spec|
+        {
+          name: spec.name,
+          version: spec.version,
+          path: spec.full_gem_path,
+          dependency: dep_keys.include?(spec.name),
+        }
+      end
+    rescue Bundler::GemfileNotFound
+      []
+    end
+
     sig { void }
     def perform_initial_indexing
       # The begin progress invocation happens during `initialize`, so that the notification is sent before we are

test/executor_test.rb

@@ -364,6 +364,20 @@ def test_initialize_sets_client_name
     assert_equal("Foo", @store.client_name)
   end
 
+  def test_workspace_dependencies
+    result = @executor.execute({
+      method: "rubyLsp/workspace/dependencies",
+      params: {},
+    })
+
+    result.response.each do |gem_info|
+      assert_instance_of(String, gem_info[:name])
+      assert_instance_of(Gem::Version, gem_info[:version])
+      assert_instance_of(String, gem_info[:path])
+      assert(gem_info[:dependency].is_a?(TrueClass) || gem_info[:dependency].is_a?(FalseClass))
+    end
+  end
+
   private
 
   def with_uninstalled_rubocop(&block)