#!/usr/bin/env bash
# Print the next build version, YYYYMMDD.NN: today's date in the household's
# time zone, then a counter that starts at .01 each day.
#
# Reads the last version from the VERSION file (or $1). Set TODAY=YYYYMMDD to
# pretend it's another day, which the tests use.
set -euo pipefail
cd "$(dirname "$0")/.."

previous="${1:-$(cat VERSION 2>/dev/null || true)}"
today="${TODAY:-$(TZ="${TZ:-America/New_York}" date +%Y%m%d)}"

if [[ "$previous" =~ ^${today}\.([0-9]+)$ ]]; then
  counter=$((10#${BASH_REMATCH[1]} + 1))
else
  counter=1
fi

printf '%s.%02d\n' "$today" "$counter"