[gnome-builder] plugins/rust-analyzer: plumb settings to rust-analyzer

[Christian Hergert <chergert src gnome org>]

commit 831ae20570cecfb28913649aad59bdf4fcbc3a04
Author: Christian Hergert <chergert redhat com>
Date:   Mon Sep 5 18:42:57 2022 -0700

    plugins/rust-analyzer: plumb settings to rust-analyzer

 .../rust-analyzer/gbp-rust-analyzer-service.c      | 126 ++++++++++++++++++++-
 1 file changed, 125 insertions(+), 1 deletion(-)
---
diff --git a/src/plugins/rust-analyzer/gbp-rust-analyzer-service.c 
b/src/plugins/rust-analyzer/gbp-rust-analyzer-service.c
index de3c477f3..3e8c5e805 100644
--- a/src/plugins/rust-analyzer/gbp-rust-analyzer-service.c
+++ b/src/plugins/rust-analyzer/gbp-rust-analyzer-service.c
@@ -31,21 +31,124 @@
 struct _GbpRustAnalyzerService
 {
   IdeLspService parent_instance;
+  GSettings *settings;
+  IdeLspClient *client;
 };
 
 G_DEFINE_FINAL_TYPE (GbpRustAnalyzerService, gbp_rust_analyzer_service, IDE_TYPE_LSP_SERVICE)
 
+static void
+gbp_rust_analyzer_service_settings_changed_cb (GbpRustAnalyzerService *self,
+                                               const char             *key,
+                                               GSettings              *settings)
+{
+  IDE_ENTRY;
+
+  g_assert (GBP_RUST_ANALYZER_SERVICE (self));
+  g_assert (G_IS_SETTINGS (settings));
+
+  if (self->client != NULL)
+    {
+      g_autoptr(GVariant) params = JSONRPC_MESSAGE_NEW ("settings", "");
+      ide_lsp_client_send_notification_async (self->client,
+                                              "workspace/didChangeConfiguration",
+                                              params,
+                                              NULL, NULL, NULL);
+    }
+
+  IDE_EXIT;
+}
+
+static void
+gbp_rust_analyzer_service_initialized_cb (GbpRustAnalyzerService *self,
+                                          IdeLspClient           *client)
+{
+  g_autoptr(GVariant) params = NULL;
+
+  IDE_ENTRY;
+
+  g_assert (GBP_RUST_ANALYZER_SERVICE (self));
+  g_assert (IDE_IS_LSP_CLIENT (client));
+
+  params = JSONRPC_MESSAGE_NEW ("settings", "");
+
+  ide_lsp_client_send_notification_async (client,
+                                          "workspace/didChangeConfiguration",
+                                          params,
+                                          NULL, NULL, NULL);
+
+  IDE_EXIT;
+}
+
+static GVariant *
+gbp_rust_analyzer_service_load_configuration_cb (GbpRustAnalyzerService *self,
+                                                 IdeLspClient           *client)
+{
+  g_autoptr(GVariant) ret = NULL;
+  g_autofree char *command = NULL;
+
+  IDE_ENTRY;
+
+  g_assert (IDE_IS_LSP_CLIENT (client));
+  g_assert (GBP_RUST_ANALYZER_SERVICE (self));
+
+  command = g_settings_get_string (self->settings, "cargo-command");
+
+  ret = JSONRPC_MESSAGE_NEW_ARRAY ("{",
+                                     "checkOnSave", "{",
+                                       "enable", JSONRPC_MESSAGE_PUT_BOOLEAN (command[0] != 0),
+                                       "command", JSONRPC_MESSAGE_PUT_STRING (command),
+                                     "}",
+                                   "}");
+
+  IDE_RETURN (g_steal_pointer (&ret));
+}
+
 static void
 gbp_rust_analyzer_service_configure_client (IdeLspService *service,
                                             IdeLspClient  *client)
 {
+  GbpRustAnalyzerService *self = (GbpRustAnalyzerService *)service;
+  g_autoptr(GVariant) params = NULL;
+
   IDE_ENTRY;
 
-  g_assert (GBP_IS_RUST_ANALYZER_SERVICE (service));
+  g_assert (GBP_IS_RUST_ANALYZER_SERVICE (self));
   g_assert (IDE_IS_LSP_CLIENT (client));
 
+  g_set_object (&self->client, client);
+
   ide_lsp_client_add_language (client, "rust");
 
+  /* Opt-in for experimental proc-macro feature to make gtk-rs more
+   * useful for GNOME developers.
+   *
+   * See: https://rust-analyzer.github.io/manual.html#configuration
+   */
+  params = JSONRPC_MESSAGE_NEW (
+    "procMacro", "{",
+      "enable", JSONRPC_MESSAGE_PUT_BOOLEAN (TRUE),
+    "}"
+  );
+
+  ide_lsp_client_set_initialization_options (client, params);
+
+  g_object_set (client,
+                "use-markdown-in-diagnostics", TRUE,
+                NULL);
+
+  g_signal_connect_object (client,
+                           "load-configuration",
+                           G_CALLBACK (gbp_rust_analyzer_service_load_configuration_cb),
+                           self,
+                           G_CONNECT_SWAPPED);
+
+  g_signal_connect_object (client,
+                           "initialized",
+                           G_CALLBACK (gbp_rust_analyzer_service_initialized_cb),
+                           self,
+                           G_CONNECT_SWAPPED);
+
   IDE_EXIT;
 }
 
@@ -63,11 +166,25 @@ gbp_rust_analyzer_service_configure_launcher (IdeLspService         *service,
   IDE_EXIT;
 }
 
+static void
+gbp_rust_analyzer_service_dispose (GObject *object)
+{
+  GbpRustAnalyzerService *self = (GbpRustAnalyzerService *)object;
+
+  g_clear_object (&self->settings);
+  g_clear_object (&self->client);
+
+  G_OBJECT_CLASS (gbp_rust_analyzer_service_parent_class)->dispose (object);
+}
+
 static void
 gbp_rust_analyzer_service_class_init (GbpRustAnalyzerServiceClass *klass)
 {
+  GObjectClass *object_class = G_OBJECT_CLASS (klass);
   IdeLspServiceClass *lsp_service_class = IDE_LSP_SERVICE_CLASS (klass);
 
+  object_class->dispose = gbp_rust_analyzer_service_dispose;
+
   lsp_service_class->configure_client = gbp_rust_analyzer_service_configure_client;
   lsp_service_class->configure_launcher = gbp_rust_analyzer_service_configure_launcher;
 }
@@ -76,4 +193,11 @@ static void
 gbp_rust_analyzer_service_init (GbpRustAnalyzerService *self)
 {
   ide_lsp_service_set_program (IDE_LSP_SERVICE (self), "rust-analyzer");
+
+  self->settings = g_settings_new ("org.gnome.builder.rust-analyzer");
+  g_signal_connect_object (self->settings,
+                           "changed",
+                           G_CALLBACK (gbp_rust_analyzer_service_settings_changed_cb),
+                           self,
+                           G_CONNECT_SWAPPED);
 }