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#!/bin/sh
#
# Utility to portably get a file's modification time
#
# Copyright (C) 2018, 2019 Patrick McDermott
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
set -u
get_mtime()
{
local file="${1}"
shift 1
local m=
local d=
local y=
local now_m=
local now_y=
read m d y <<-EOF
$(LC_ALL=POSIX ls -l "${file}" | cut -d ' ' -f 6-8)
EOF
case "${m}" in
'Jan') m=1;; 'Feb') m=2;; 'Mar') m=3;; 'Apr') m=4;;
'May') m=5;; 'Jun') m=6;; 'Jul') m=7;; 'Aug') m=8;;
'Sep') m=9;; 'Oct') m=10;; 'Nov') m=11;; 'Dec') m=12;;
esac
case "${y}" in *':'*)
read now_m now_y <<-EOF
$(date '+%m %Y')
EOF
now_m="${now_m#0}"
if [ ${now_m} -ge ${m} ]; then
y=${now_y}
else
y=$((${now_y} - 1))
fi
esac
printf '%d-%02d-%02d\n' ${y} ${m} ${d}
return 0
}
usage()
{
printf 'Usage: %s <file>\n' "${0}"
}
main()
{
if [ ${#} -lt 1 ]; then
usage >&2
exit 1
fi
get_mtime "${1}"
}
main "${@}"
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