#!/bin/zsh

echo "Press any key combination. Press Ctrl+C to exit."
while true; do
  result=""
  escape_sequence=""
  read -sk 1 key
  if [[ $key == $'\x1b' ]]; then
    escape_sequence+="^["
    while read -sk 1 -t 0.01 next_key; do
      escape_sequence+="$next_key"
    done
    result="$escape_sequence"
  else
    result="$key"
  fi
  echo -E "Key: $result"
done