Add alternick support

rowbot

@@ -410,6 +410,7 @@ on_sys_exit_998_net() {
 
 annoyatron900() {
   irc_ping "row your bot gently down the stream"
+  run_callbacks annoyatron900_
 }
 
 on_sys_before_999_annoyatron900() {
@@ -884,6 +885,45 @@ on_init_sysfacts() {
   plugin_reg sysfact get_sysfact
 }
 
+# alternick tracking
+
+on_init_alternick() {
+  get_option registered no
+}
+
+on_register_alternick() {
+  config[registered]=yes
+}
+
+on_msg_433_alternick() {
+  if [[ ${config[registered]} = yes ]]; then
+    log_debug "somebody is already using ${config[nick/]}"
+    return 1
+  fi
+}
+
+on_late_msg_433_alternick() {
+  if [[ ${config[registered]} = no ]]; then
+    log_info "using nick ${config[nick]}_"
+    irc_nick "${config[nick]}_"
+    desired_nick=${config[nick]}
+  fi
+}
+
+annoyatron900_alternick() {
+  if [[ $desired_nick ]]; then
+    irc_nick "$desired_nick"
+  fi
+}
+
+on_late_msg_NICK_alternick() {
+  if [[ ${msg[from]} = "${config[nick]}" ]]; then
+    desired_nick=
+    log_info "got desired nick!"
+    config[nick]=${msg_args[-1]}
+  fi
+}
+
 ###
 # cleanup
 ###