aoc.sh

#!/usr/bin/env bash

set -o errexit
set -o pipefail

usage() {
    local name
    name="$(basename "${0}")"
    echo "Fetch inputs and send answers for Advent of Code.

Usage:
  ${name} (input|inputs)   [-d=<day>] [-y=<year>] [-c=<cookie>] [<path>]
  ${name} answer           [-d=<day>] [-y=<year>] [-c=<cookie>] <level> <answer>

Options:
  -d    Day    [default: \$AOC_DAY or current day]
  -y    Year   [default: \$AOC_YEAR or current year]
  -c    Cookie [default: \$AOC_COOKIE or cookie.txt]"

    exit 1
}

if [[ -z ${1} ]]; then usage; fi
mode="${1}"
shift

day="${AOC_DAY:-$(date +"%Oe" | sed 's/[[:blank:]]//')}"
year="${AOC_YEAR:-$(date +"%Y")}"
cookie="${AOC_COOKIE:-$(if [[ -r "cookie.txt" ]]; then cat "cookie.txt"; fi)}"

while getopts d:y:c: opt; do
    case ${opt} in
    d) day="${OPTARG}" ;;
    y) year="${OPTARG}" ;;
    c) cookie="${OPTARG}" ;;
    *) break ;;
    esac
done
shift $((OPTIND - 1))

curl_flags=()
curl_flags+=("--fail")
curl_flags+=("--location")
curl_flags+=("--no-progress-meter")
curl_flags+=("--header")
curl_flags+=("cookie: session=${cookie}")
curl_flags+=("--user-agent")
curl_flags+=("github.com/nothub/advent-of-code/blob/master/aoc.sh aoc@hub.lol")

case ${mode} in
input | inputs)
    path="${1:-"src/test/resources/inputs/${year}/day${day}"}"
    echo >&2 "Downloading input file for ${year}/${day} to: ${path}"
    if [[ -f "${path}" ]]; then
        echo >&2 "File already present, skipping download..."
        exit 0
    fi
    curl "${curl_flags[@]}" \
        --create-dirs \
        --output "${path}" \
        "https://adventofcode.com/${year}/day/${day}/input"
    ;;
answer)
    if [[ ${#} -lt 2 ]]; then usage; fi
    level="${1}"
    answer="${2}"
    echo >&2 "Posting answer for ${year}/${day}/${level}: ${answer}"
    curl "${curl_flags[@]}" \
        --data "level=${level}&answer=${answer}" \
        "https://adventofcode.com/${year}/day/${day}/answer" |
        grep "<article>" |
        sed -E "s/<[^<>]*>|\[.*\]//g"
    ;;
*)
    usage
    ;;
esac