cli: specify common options in a new group

Actions on modems from specific interfaces, like 3GPP, will also need the modem
to be specified.

The new 'Common' option group will handle all options to specify objects.

cli/mmcli-common.c

@@ -549,3 +549,47 @@ mmcli_get_lock_string (MMModemLock lock)
     value = g_enum_get_value (enum_class, lock);
     return value->value_nick;
 }
+
+/* Common options */
+static gchar *modem_str;
+static gchar *bearer_str;
+
+static GOptionEntry entries[] = {
+    { "modem", 'm', 0, G_OPTION_ARG_STRING, &modem_str,
+      "Specify modem by path or index. Shows modem information if no action specified.",
+      "[PATH|INDEX]"
+    },
+    { "bearer", 'b', 0, G_OPTION_ARG_STRING, &bearer_str,
+      "Specify bearer by path. Shows bearer information if no action specified.",
+      "[PATH]"
+    },
+    { NULL }
+};
+
+GOptionGroup *
+mmcli_get_common_option_group (void)
+{
+	GOptionGroup *group;
+
+	/* Status options */
+	group = g_option_group_new ("common",
+	                            "Common options",
+	                            "Show common options",
+	                            NULL,
+	                            NULL);
+	g_option_group_add_entries (group, entries);
+
+	return group;
+}
+
+const gchar *
+mmcli_get_common_modem_string (void)
+{
+    return modem_str;
+}
+
+const gchar *
+mmcli_get_common_bearer_string (void)
+{
+    return bearer_str;
+}