get_input

#!/usr/bin/env zsh
# More safety, by turning some bugs into errors.
set -o errexit -o pipefail -o noclobber -o nounset

# option --output/-o requires 1 argument
LONGOPTS=year:,day:,token::
OPTIONS=y:,d:,t::

# -temporarily store output to be able to check for errors
# -activate quoting/enhanced mode (e.g. by writing out “--options”)
# -pass arguments only via   -- "$@"   to separate them correctly
# -if getopt fails, it complains itself to stdout
PARSED=$(getopt --options=$OPTIONS --longoptions=$LONGOPTS --name "$0" -- "$@") || exit 2
# read getopt’s output this way to handle the quoting right:
eval set -- "$PARSED"

year=- day=- token=-
# now enjoy the options in order and nicely split until we see --
while true; do
  case "$1" in
  --year)
    year="$2"
    shift 2
    ;;
  --day)
    day="$2"
    shift 2
    ;;
  --token)
    token="$2"
    shift 2
    ;;
  --)
    shift
    break
    ;;
  *)
    echo "Programming error"
    exit 3
    ;;
  esac
done

# check date is not in the future
if [[ $(date -d $year-12-$day +%s) > $(date +%s) ]]; then
  echo "Can not access the future"
  exit 4
fi

# set token to env token
if [[ $token == "-" ]]; then
  token=$AOC_SESSION_TOKEN
fi

# ensure input directory exists
INPUT_DIRECTORY="$(git rev-parse --show-toplevel)/${year}/input"
if [[ ! -d "$INPUT_DIRECTORY" ]]; then
  mkdir -p $INPUT_DIRECTORY
fi

# download input data if not already present
INPUT_FILE_PATH=$(printf "%s/day%02d.txt" $INPUT_DIRECTORY $day)
if [[ ! -f $INPUT_FILE_PATH ]]; then
  printf "Downloading input data for AoC-%s day %d into '%s' ...\n" $year $day $INPUT_FILE_PATH
  curl "https://adventofcode.com/${year}/day/${day}/input" --cookie "session=$token" -o $INPUT_FILE_PATH
else
  printf "Input data for AoC-%s day %d already exist!\n" $year $day $INPUT_FILE_PATH
fi