made getcbk_data implementation-agnostic and also it works now

bashbot-lib.sh

@@ -101,11 +101,10 @@ getchat_title(){
   || getusr_name "${1}"
 }
 
-get_cbks() {
+getcbk_data() {
   local callbacks="$(tail -n 1 "${bot_tmpdir}${1}"\
-   | grep "\"callback_query\"" | grep "\"callback_data\":\"recheck\"")"
-   [ ! -z "${callbacks}" ] && is_callback=0 && printf "%s\n" "${callbacks}"\
-   >> "${bot_tmpdir}callbacks.txt"
+   | grep "\"callback_query\"" | grep -om1 '"data":"\(\\"\|[^"]*\)*"}')"
+   [ ! -z "${callbacks}" ] && utf-16-surrogate-pair-decode "${callbacks:8:-2}"
 }
 
 sendmsg() {
@@ -145,4 +144,5 @@ getmsg_content(){
   _REF[chat_title]="$(getchat_title "${2}")"
   _REF[msg_id]="$(getmsg_id "${2}")"
   _REF[text]="$(gettext "${2}")"
+  _REF[callback]="$(getcbk_data "${2}")"
 }