client

#!/usr/bin/env bash

get_size(){ read -r LINES COLUMNS < <(stty size); }
send(){ echo -e "\r\e[K$u> $cht" >&3; }

client(){
   printf '\e[%sH' "$LINES"
	while IFS= read -rsn1 -p $'\r\e[K'"-- NORMAL -- ($u): " chat; do
      case $chat in
	 		i) compose ;;
	 		q) exit ;;
      esac
   done
}

compose(){
	while IFS= read -rsn1 -p $'\r\e[K'"-- INSERT -- ($u): $cht" chat; do
      printf '\e[%sH' "$LINES"
      case "$chat" in
         $'\177') [[ $cht ]] && { echo "delete" >&3; cht="${cht%?}"; } ;;
			$'\033') send; break ;;
         $'\015'|'') send; echo "enter" >&3; cht="" ;;
         " "|*) cht+="$chat" ;;
      esac
		send
   done
}

main(){
	trap 'exec 3-&-' EXIT
   #trap "printf '\e[?1049l'" EXIT
   #printf '\e[?1049h'
   trap "printf '\e[m\e[2J\e[H\e[?25h'" EXIT
   trap "get_size" WINCH

	server=chat

	exec 3>$server
   [[ $1 ]] && u="$1" || read -p "Choose a username: " u
   echo -e "\n\r\e[K$u er tilføjet\n" >&3
   echo -e "useradd" >&3
   client
}

clear
main "$@"