#!/bin/sh
JOURNAL="$HOME/documents/journal.txt"
EDITOR="vim"

add(){
  TMPFILE="$(mktemp)"
  TIME="$(date "+%Y-%m-%d %H:%M")"

  $EDITOR "$TMPFILE"
  test -s "$TMPFILE" || exit

  printf "%s %s\\n\\n" "$TIME" "$(sed '/^\s*$/d' "$TMPFILE")" >> "$JOURNAL"
  rm "$TMPFILE"
}

list(){
  awk -v pattern="$1" \
  '$0 ~ pattern {print $1 " " $2 "\n" substr($0, index($0,$3)) "\n"}' \
  RS= "$JOURNAL" | grep --color -P "$1|"
}

main(){
  case "$1" in
    l|ls|list)    shift; list "$@";;
    a|ad|add)     add;;
    e|ed|edit)    $EDITOR "$JOURNAL";;
    *)            add;;
  esac
}

main "$@"