#! /bin/bash

today=~/vimwiki/diary/$(date --iso-8601).md

specify_date() {
  YEAR=${YEAR:-22}

  while read -p 'Month? ' -r MONTH; do
    [ -z $MONTH ] && MONTH=$(date +%m)
    MONTH=$(printf "%02d" $MONTH)
    date -d $YEAR-$MONTH-01 &>/dev/null && break
  done

  while read -p 'Day? ' -r DAY; do
    [ -z $DAY ] && DAY=$(date +%d)
    DAY=$(printf "%02d" $DAY)
    date -d $YEAR-$MONTH-$DAY &>/dev/null && break
  done

  FILE=~/vimwiki/diary/20$YEAR-$MONTH-$DAY.md
  vim -c 'Goyo' $FILE
}

print_today() {
  cat $today
}

edit_today() {
  vim -c Goyo $today
}

add_entry() {
  [[ $# -ne 0 ]] && echo - "$@" >>$today
  sed -E 's/\t/    /g; s/(^[[:space:]]*)/\1- /' >>$today
}

case "$1" in
  specify) 
    specify_date ;;
  print)
    print_today ;;
  today)
    edit_today ;;
  *)
    add_entry "$@" ;;
esac