irc: add option irc.network.alternate_nick to disable dynamic nick generation when all nicks are already in use on server (task #12281)

src/plugins/irc/irc-config.c

@@ -120,6 +120,7 @@ struct t_config_option *irc_config_color_topic_new;
 
 /* IRC config, network section */
 
+struct t_config_option *irc_config_network_alternate_nick;
 struct t_config_option *irc_config_network_autoreconnect_delay_growing;
 struct t_config_option *irc_config_network_autoreconnect_delay_max;
 struct t_config_option *irc_config_network_colors_receive;
@@ -2471,6 +2472,14 @@ irc_config_init ()
         return 0;
     }
 
+    irc_config_network_alternate_nick = weechat_config_new_option (
+        irc_config_file, ptr_section,
+        "alternate_nick", "boolean",
+        N_("get an alternate nick when the nick is already used on server: add "
+           "some \"_\" until the nick has a length of 9, and then replace last "
+           "char (or the two last chars) by a number from 1 to 99, until we "
+           "find a nick not used on server"),
+        NULL, 0, 0, "on", NULL, 0, NULL, NULL, NULL, NULL, NULL, NULL);
     irc_config_network_autoreconnect_delay_growing = weechat_config_new_option (
         irc_config_file, ptr_section,
         "autoreconnect_delay_growing", "integer",

src/plugins/irc/irc-config.h

@@ -149,6 +149,7 @@ extern struct t_config_option *irc_config_color_reason_quit;
 extern struct t_config_option *irc_config_color_topic_old;
 extern struct t_config_option *irc_config_color_topic_new;
 
+extern struct t_config_option *irc_config_network_alternate_nick;
 extern struct t_config_option *irc_config_network_autoreconnect_delay_growing;
 extern struct t_config_option *irc_config_network_autoreconnect_delay_max;
 extern struct t_config_option *irc_config_network_colors_receive;

src/plugins/irc/irc-server.c

@@ -551,10 +551,13 @@ irc_server_get_alternate_nick (struct t_irc_server *server)
             return nick;
         }
 
-        /*
-         * we have tried all nicks in list, then use main nick
-         * and we will add "_" and then number if needed
-         */
+        /* now we have tried all nicks in list */
+
+        /* if alternate nick is disabled, just return NULL */
+        if (!weechat_config_boolean (irc_config_network_alternate_nick))
+            return NULL;
+
+        /* use main nick and we will add "_" and then number if needed */
         server->nick_alternate_number = 0;
         snprintf (nick, sizeof (nick), "%s", server->nicks_array[0]);
     }