extension-tool: Use enable/disable D-Bus API if possible

Commit 4589da957 added D-Bus API for enabling/disabling extensions,
use that if possible to provide better feedback and not clutter the
settings with non-existent UUIDs.

The old code path is preserved as fallback to keep the commands
working from outside a running shell session.

https://gitlab.gnome.org/GNOME/gnome-shell/issues/2391

subprojects/extensions-tool/src/command-disable.c

@@ -26,7 +26,37 @@
 #include "config.h"
 
 static gboolean
-disable_extension (const char *uuid)
+disable_extension_dbus (GDBusProxy *proxy,
+                        const char *uuid)
+{
+  g_autoptr (GVariant) response = NULL;
+  g_autoptr (GError) error = NULL;
+  gboolean success = FALSE;
+
+  response = g_dbus_proxy_call_sync (proxy,
+                                     "DisableExtension",
+                                     g_variant_new ("(s)", uuid),
+                                     0,
+                                     -1,
+                                     NULL,
+                                     &error);
+
+  if (response == NULL)
+    {
+      g_printerr (_("Failed to connect to GNOME Shell\n"));
+      return FALSE;
+    }
+
+  g_variant_get (response, "(b)", &success);
+
+  if (!success)
+    g_printerr (_("Extension “%s” does not exist\n"), uuid);
+
+  return success;
+}
+
+static gboolean
+disable_extension_gsettings (const char *uuid)
 {
   g_autoptr(GSettings) settings = get_shell_settings ();
 
@@ -37,6 +67,20 @@ disable_extension (const char *uuid)
          settings_list_add (settings, "disabled-extensions", uuid);
 }
 
+static gboolean
+disable_extension (const char *uuid)
+{
+  g_autoptr (GDBusProxy) proxy = NULL;
+  g_autoptr (GError) error = NULL;
+
+  proxy = get_shell_proxy (&error);
+
+  if (proxy != NULL)
+    return disable_extension_dbus (proxy, uuid);
+  else
+    return disable_extension_gsettings (uuid);
+}
+
 int
 handle_disable (int argc, char *argv[], gboolean do_help)
 {

subprojects/extensions-tool/src/command-enable.c

@@ -26,7 +26,37 @@
 #include "config.h"
 
 static gboolean
-enable_extension (const char *uuid)
+enable_extension_dbus (GDBusProxy *proxy,
+                       const char *uuid)
+{
+  g_autoptr (GVariant) response = NULL;
+  g_autoptr (GError) error = NULL;
+  gboolean success = FALSE;
+
+  response = g_dbus_proxy_call_sync (proxy,
+                                     "EnableExtension",
+                                     g_variant_new ("(s)", uuid),
+                                     0,
+                                     -1,
+                                     NULL,
+                                     &error);
+
+  if (response == NULL)
+    {
+      g_printerr (_("Failed to connect to GNOME Shell\n"));
+      return FALSE;
+    }
+
+  g_variant_get (response, "(b)", &success);
+
+  if (!success)
+    g_printerr (_("Extension “%s” does not exist\n"), uuid);
+
+  return success;
+}
+
+static gboolean
+enable_extension_gsettings (const char *uuid)
 {
   g_autoptr(GSettings) settings = get_shell_settings ();
 
@@ -37,6 +67,20 @@ enable_extension (const char *uuid)
          settings_list_remove (settings, "disabled-extensions", uuid);
 }
 
+static gboolean
+enable_extension (const char *uuid)
+{
+  g_autoptr (GDBusProxy) proxy = NULL;
+  g_autoptr (GError) error = NULL;
+
+  proxy = get_shell_proxy (&error);
+
+  if (proxy != NULL)
+    return enable_extension_dbus (proxy, uuid);
+  else
+    return enable_extension_gsettings (uuid);
+}
+
 int
 handle_enable (int argc, char *argv[], gboolean do_help)
 {