Simple note taking app on terminal

notes.sh

#!/bin/bash
# Create a dated text file at a specific location and append text to it.
#
# Usage:
#   $ notes something you want to jot down (appends that text to the file)
#   $ xclip -o | notes                     (appends your clipboard to the file)
#   $ notes                                (opens the file in your editor)
#
# This script is almost completely copied from nickjj's below project
# https://github.com/nickjj/notes

# Settings
readonly NOTES_DIRECTORY="${NOTES_DIRECTORY:-"${HOME}/notes"}"
readonly NOTES_EDITOR="nvim"

# Create notes directory if doesn't exist
if [ ! -d "${NOTES_DIRECTORY}" ]; then
    while true; do
        printf "%s does not exist, do you want to create it? (y/n) " "${NOTES_DIRECTORY}"
        read -r yn

        case "${yn}" in
            [Yy]* ) mkdir -p "${NOTES_DIRECTORY}"; break;;
            [Nn]* ) exit;;
            * ) printf "Please answer y or n\n\n";;
        esac
    done
fi

# Touch file with todays date
file="$(date +'%d-%b-%Y').txt"
NOTES_PATH=${NOTES_DIRECTORY}/$file
touch -a $NOTES_PATH

# If no argument is supplied open today's note in editor
# If there are notes given as arguments append to today's note
if [ $# -eq 0 ]
  then
    eval "${NOTES_EDITOR}" "${NOTES_PATH}"
else
    printf "%s\n\n" "${*}" >> $NOTES_PATH
fi