implemented callback detection and response

bot.sh

@@ -19,12 +19,14 @@ exec 2>"${bot_tmpdir}/error.log"
 . ./bashbot-lib/viewer.sh
 
 while [ "${1}" == "start" ]; do
-  grep "\S" <<< $(getupd) >/dev/null || continue
+  getupd >/dev/null || continue
   declare -A curmsg
   getmsg_content curmsg updates.txt
   view_content curmsg
   for i in $(awk '{print $1}' ./allowed_ids.txt); do
-    [ "${curmsg[user_id]}" == "${i}" ] && [ "${curmsg[text]}" == "/start" ] && {
+    [ "${curmsg[user_id]}" == "${i}" ] && {
+      [ "${curmsg[callback]}" == "recheck" ] || [ "${curmsg[text]}" == "/start" ]
+    } && {
       sendmsg "${curmsg[chat_id]}" $(./getip.sh "${bot_tmpdir}")
       unset curmsg
       declare -A curmsg