new

#!/bin/bash

# Compute some constants
YEAR=${PWD##*/}
[[ $YEAR =~ 20[[:digit:]][[:digit:]] ]] || { echo "Run from year directory." >&2; exit 2; }
DAY=${1}
[[ $DAY =~ [[:digit:]]?[[:digit:]] && 0 -lt "$DAY" && "$DAY" -lt 32 ]] || {
    echo "You have a bad day: $DAY" >&2; exit 2; }
SCRIPTDIR=$( cd -- "$( dirname -- "${BASH_SOURCE[0]}" )" && pwd )
PYFILE="./${DAY}/${DAY}.py"
URL="https://adventofcode.com/${YEAR}/day/${DAY}"

# Create day directory and python file
mkdir -p "./${DAY}" || { echo "Could not make directory: ./${DAY}" >&2; exit 3; }
cp -i --no-preserve=mode,timestamps "${SCRIPTDIR}/template.py" "$PYFILE" && \
chmod 755 "$PYFILE" 

# Fill values into python file docstring
tempfile=$(mktemp) && \
curl --silent --fail \
    --user-agent 'https://github.com/jacktose/advent-of-code by jacktose' \
    "${URL}" \
> "$tempfile" && \
title="$(sed -n '/^<article class="day-desc"><h2>--- \(Day [12]\?[0-9]: .\+\) ---<\/h2>.*/{s//\1/p;q}' "$tempfile")" && \
sed -i '/^"""/{n;s~^https:\/\/adventofcode.com\/[0-9]\{4\}\/day\/_~'"$URL"'~;n;s/^$/'"$title"'/; :loop n; b loop}' "$PYFILE" || \
echo "Could not edit $pyfile" >&2
rm -f "$tempfile"

# Get input file
COOKIE=$(<"${SCRIPTDIR}/.session_cookie") && \
tempfile=$(mktemp) && \
curl --silent --fail \
    --cookie "$COOKIE" \
    --user-agent 'https://github.com/jacktose/advent-of-code by jacktose' \
    "${URL}/input" \
> "$tempfile" && \
mv "$tempfile" "./${DAY}/input.txt" && \
chmod 444 "./${DAY}/input.txt" || \
echo "Could not download input" >&2
rm -f "$tempfile"

# Create example file
touch "./${DAY}/example.txt"

exit 0