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#! /bin/sh
if [ "$1" = "-f" ]; then
shift
DATE_FORMAT="$1"
shift
fi
: ${FILE:=$1}
: ${DATE_FILE:=$(dirname "$FILE")/.$(basename "${FILE}").date}
: ${DEFAULT_DATE:=$2}
: ${DATE_FORMAT:=%Y-%m-%d}
LC_TIME=C; export LC_TIME
date=
[ -n "${FILE}" ] || {
echo >&2 "$0 $(dirname "$0")/file [$(dirname "$0")/file.date [DEFAULT_DATE]]"
exit 1
}
[ -f "${DATE_FILE}" ] && date="$(cat "${DATE_FILE}")"
[ -n "${date}" ] ||
date="$(git log -n 1 --format=format:%cD --no-patch "${FILE}")"
[ -n "${date}" ] ||
date="${DEFAULT_DATE}"
[ -n "${date}" ] ||
[ -z "${SOURCE_DATE_EPOCH-}" ] ||
date="$(date -u -d "@${SOURCE_DATE_EPOCH}")"
[ -n "${date}" ] ||
date="$(date -u)"
[ -n "${date}" ] || {
echo >&2 'Undefined date.'
exit 1
}
exec printf "%s" $(date -u "+${DATE_FORMAT}" -d "${date}")
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