cli,location: new '--location-monitor' action

This action allows us to monitor location updates as signaled via the
'Location' property, only available if location signaling has been
explicitly enabled (e.g. with --location-set-enable-signal)

cli/mmcli-modem-location.c

@@ -65,6 +65,7 @@ static gboolean disable_gps_unmanaged_flag;
 static gboolean set_enable_signal_flag;
 static gboolean set_disable_signal_flag;
 static gboolean get_flag;
+static gboolean monitor_flag;
 static gchar *set_supl_server_str;
 static gchar *inject_assistance_data_str;
 static gchar *set_gps_refresh_rate_str;
@@ -78,6 +79,10 @@ static GOptionEntry entries[] = {
       "Get all available location information.",
       NULL
     },
+    { "location-monitor", 0, 0, G_OPTION_ARG_NONE, &monitor_flag,
+      "Monitor all available location information.",
+      NULL
+    },
     { "location-enable-3gpp", 0, 0, G_OPTION_ARG_NONE, &enable_3gpp_flag,
       "Enable 3GPP location gathering.",
       NULL
@@ -210,6 +215,7 @@ mmcli_modem_location_options_enabled (void)
     n_actions = (status_flag +
                  any_location_setup_flag +
                  get_flag +
+                 monitor_flag +
                  !!set_supl_server_str +
                  !!inject_assistance_data_str +
                  !!set_gps_refresh_rate_str);
@@ -219,7 +225,9 @@ mmcli_modem_location_options_enabled (void)
         exit (EXIT_FAILURE);
     }
 
-    if (status_flag)
+    if (monitor_flag)
+        mmcli_force_async_operation ();
+    else if (status_flag)
         mmcli_force_sync_operation ();
 
     checked = TRUE;
@@ -575,6 +583,34 @@ get_location_process_reply (MMLocation3gpp *location_3gpp,
     g_clear_object (&location_cdma_bs);
 }
 
+static void
+cancelled (GCancellable *cancellable)
+{
+    mmcli_async_operation_done ();
+}
+
+static void
+print_signaled_location (MMModemLocation *modem_location)
+{
+    MMLocation3gpp    *location_3gpp;
+    MMLocationGpsNmea *location_gps_nmea;
+    MMLocationGpsRaw  *location_gps_raw;
+    MMLocationCdmaBs  *location_cdma_bs;
+
+    location_3gpp     = mm_modem_location_get_signaled_3gpp     (modem_location);
+    location_gps_nmea = mm_modem_location_get_signaled_gps_nmea (modem_location);
+    location_gps_raw  = mm_modem_location_get_signaled_gps_raw  (modem_location);
+    location_cdma_bs  = mm_modem_location_get_signaled_cdma_bs  (modem_location);
+
+    get_location_process_reply (location_3gpp, location_gps_nmea, location_gps_raw, location_cdma_bs, NULL);
+}
+
+static void
+signaled_location_updated (MMModemLocation *modem_location)
+{
+    print_signaled_location (modem_location);
+}
+
 static void
 get_location_ready (MMModemLocation *modem_location,
                     GAsyncResult    *result)
@@ -635,6 +671,22 @@ get_modem_ready (GObject      *source,
         return;
     }
 
+    /* Request to monitor location? */
+    if (monitor_flag) {
+        print_signaled_location (ctx->modem_location);
+        g_signal_connect (ctx->modem_location,
+                          "notify::location",
+                          G_CALLBACK (signaled_location_updated),
+                          NULL);
+
+        /* If we get cancelled, operation done */
+        g_cancellable_connect (ctx->cancellable,
+                               G_CALLBACK (cancelled),
+                               NULL,
+                               NULL);
+        return;
+    }
+
     /* Request to set SUPL server? */
     if (set_supl_server_str) {
         g_debug ("Asynchronously setting SUPL server...");