commit 01fda372f3423aeb0d0f5bca9118449c12ed63b4
Author: Andrew Ekstedt <andrew.ekstedt@gmail.com>
Date:   Thu Nov 30 04:45:30 2023 +0000

    initial commit

diff --git a/cron.sh b/cron.sh
new file mode 100755
index 0000000..53a7f92
--- /dev/null
+++ b/cron.sh
@@ -0,0 +1,72 @@
+#!/bin/bash
+set -euo pipefail
+
+year=2023
+root=~/adventofcode${year}
+
+getinput() {
+    curl -fsS -b "$root/cookie" -O "https://adventofcode.com/$year/day/$1/input"
+}
+
+getsamples() {
+    curl -fsS "https://adventofcode.com/$year/day/$1" |
+    awk '/<pre><code>/ {sub("<pre><code>", ""); CODE=1; IDX+=1} /<\/code>/ {CODE=0} CODE {print > sprintf("sample%d.in", IDX)}'
+}
+
+if [[ "$*" = "auto" ]]; then
+    # get the current day in UTC with and without zero padding.
+    # UTC is a few hours ahead of US Eastern time, so
+    # it should match the day of the current puzzle even
+    # if the clocks on tilde.town and AoC aren't synced exactly
+    day_unpadded=$(TZ=UTC date '+%-d')
+    day_padded=$(TZ=UTC date '+%0d')
+    dir=$root/day$day_padded
+elif (( $# == 1 || $# == 2 )); then
+    day_unpadded=$(printf "%d" "$1")
+    day_padded=$(printf "%02d" "$1")
+    dir=${2:-}
+else
+    echo >&2 "usage: $0 day [out_dir]"
+    echo >&2 "       $0 auto"
+    exit 0
+fi
+
+if [[ -z "$dir" ]]; then
+    dir=$root/day$day_padded
+fi
+
+if test -e "$dir"; then
+    echo >&2 "'$dir' already exists! refusing to continue"
+    exit 1
+fi
+
+cwd=${PWD:-`pwd`}
+mkdir "$dir"
+cd "$dir" || exit 1
+
+error=0
+
+if ! getinput "$day_unpadded"; then
+    echo >&2 "error: failed to get input for day $day_unpadded"
+    error=1
+fi
+
+if ! getsamples "$day_unpadded"; then
+    echo >&2 "error: failed to get sample inputs for day $day_unpadded"
+    error=1
+fi
+
+if [[ $error -ne 0 ]]; then
+    # we might not have managed to grab any files
+    # at all. try to clean up after ourselves by removing
+    # the directory (if it's empty)
+    if cd "$cwd" && rmdir --ignore-fail-on-non-empty "$dir" >&2; then
+        if ! test -d "$dir"; then
+            echo "cleaning up '$dir'"
+        else
+            echo "not cleaning up '$dir'"
+        fi
+    fi
+fi
+
+exit $error