#!/usr/bin/env sh
# 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)
#
# Produces:
#   YYYY-W.txt in your $NOTES_DIRECTORY (this is set below).

set -e

YEAR="$(date +"%Y")"
WEEK="$(date +"%W")"
NOTES_DIRECTORY="${NOTES_DIRECTORY:-${HOME}/stuff/notes/notes}"
NOTES_EDITOR="${EDITOR:-vim}"
NOTES_FILE="${YEAR}-${WEEK}.md"
NOTES_PATH="${NOTES_DIRECTORY}/${NOTES_FILE}"

readonly YEAR WEEK NOTES_FILE NOTES_PATH NOTES_EDITOR NOTES_DIRECTORY

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

if [ ! -f "${NOTES_PATH}" ]; then
  printf '# %s Week %s\n' "${YEAR}" "${WEEK}" > "${NOTES_PATH}"
fi

if [ ${#} -eq 0 ]; then
    if [ -p "/dev/stdin" ]; then
        (cat; printf "\n") >> "${NOTES_PATH}"
    else
        eval "${NOTES_EDITOR}" "${NOTES_PATH}"
    fi
else
    printf "%s\n" "${*}" >> "${NOTES_PATH}"
fi