Zsh / Bash: Getting the current function name invoked

func_name.sh

function func_name {
  case "${SHELL}" in
    */bash)
      # Bash
      echo ${FUNCNAME[2]}
      ;;
    */zsh)
      # Zsh
      echo ${funcstack[2]}
      ;;
    *)
      echo "Unsupported shell: ${SHELL}."
  esac
}

This function works only inside another function.

Examples:

function tar_compress {
  if [ -z "${1}" ]; then
    echo "usage: $(func_name) DIR_NAME"
    return 1
  fi

  tar -czvf "${1}.tar.gz" "${1}"
}

function tar_extract {
  if [ -z "${1}" ]; then
    echo "usage: $(func_name) TAR_FILENAME"
    return 1
  fi

  tar -zxvf
}