#!/bin/sh

# Get modification time of a file or directory and pretty-print it.

scriptversion=2018-03-07.03; # UTC

# Copyright (C) 1995-2018 Free Software Foundation, Inc.

# written by Ulrich Drepper <drepper@gnu.ai.mit.edu>, June 1995

#

# 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 2, 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 <https://www.gnu.org/licenses/>.

# As a special exception to the GNU General Public License, if you

# distribute this file as part of a program that contains a

# configuration script generated by Autoconf, you may include it under

# the same distribution terms that you use for the rest of that program.

# This file is maintained in Automake, please report

# bugs to <bug-automake@gnu.org> or send patches to

# <automake-patches@gnu.org>.

if test -n "${ZSH_VERSION+set}" && (emulate sh) >/dev/null 2>&1; then

  emulate sh

  NULLCMD=:

  # Pre-4.2 versions of Zsh do word splitting on ${1+"$@"}, which

  # is contrary to our usage.  Disable this feature.

  alias -g '${1+"$@"}'='"$@"'

  setopt NO_GLOB_SUBST

fi

case $1 in

  '')

     echo "$0: No file.  Try '$0 --help' for more information." 1>&2

     exit 1;

     ;;

  -h | --h*)

    cat <<\EOF

Usage: mdate-sh [--help] [--version] FILE

Pretty-print the modification day of FILE, in the format:

1 January 1970

Report bugs to <bug-automake@gnu.org>.

EOF

    exit $?

    ;;

  -v | --v*)

    echo "mdate-sh $scriptversion"

    exit $?

    ;;

esac

error ()

{

  echo "$0: $1" >&2

  exit 1

}

# Prevent date giving response in another language.

LANG=C

export LANG

LC_ALL=C

export LC_ALL

LC_TIME=C

export LC_TIME

# Use UTC to get reproducible result.

TZ=UTC0

export TZ

# GNU ls changes its time format in response to the TIME_STYLE

# variable.  Since we cannot assume 'unset' works, revert this

# variable to its documented default.

if test "${TIME_STYLE+set}" = set; then

  TIME_STYLE=posix-long-iso

  export TIME_STYLE

fi

save_arg1=$1

# Find out how to get the extended ls output of a file or directory.

if ls -L /dev/null 1>/dev/null 2>&1; then

  ls_command='ls -L -l -d'

else

  ls_command='ls -l -d'

fi

# Avoid user/group names that might have spaces, when possible.

if ls -n /dev/null 1>/dev/null 2>&1; then

  ls_command="$ls_command -n"

fi

# A 'ls -l' line looks as follows on OS/2.

#  drwxrwx---        0 Aug 11  2001 foo

# This differs from Unix, which adds ownership information.

#  drwxrwx---   2 root  root      4096 Aug 11  2001 foo

#

# To find the date, we split the line on spaces and iterate on words

# until we find a month.  This cannot work with files whose owner is a

# user named "Jan", or "Feb", etc.  However, it's unlikely that '/'

# will be owned by a user whose name is a month.  So we first look at

# the extended ls output of the root directory to decide how many

# words should be skipped to get the date.

# On HPUX /bin/sh, "set" interprets "-rw-r--r--" as options, so the "x" below.

set x`$ls_command /`

# Find which argument is the month.

month=

command=

until test $month

do

  test $# -gt 0 || error "failed parsing '$ls_command /' output"

  shift

  # Add another shift to the command.

  command="$command shift;"

  case $1 in

    Jan) month=January; nummonth=1;;

    Feb) month=February; nummonth=2;;

    Mar) month=March; nummonth=3;;

    Apr) month=April; nummonth=4;;

    May) month=May; nummonth=5;;

    Jun) month=June; nummonth=6;;

    Jul) month=July; nummonth=7;;

    Aug) month=August; nummonth=8;;

    Sep) month=September; nummonth=9;;

    Oct) month=October; nummonth=10;;

    Nov) month=November; nummonth=11;;

    Dec) month=December; nummonth=12;;

  esac

done

test -n "$month" || error "failed parsing '$ls_command /' output"

# Get the extended ls output of the file or directory.

set dummy x`eval "$ls_command \"\\\$save_arg1\""`

# Remove all preceding arguments

eval $command

# Because of the dummy argument above, month is in $2.

#

# On a POSIX system, we should have

#

# $# = 5

# $1 = file size

# $2 = month

# $3 = day

# $4 = year or time

# $5 = filename

#

# On Darwin 7.7.0 and 7.6.0, we have

#

# $# = 4

# $1 = day

# $2 = month

# $3 = year or time

# $4 = filename

# Get the month.

case $2 in

  Jan) month=January; nummonth=1;;

  Feb) month=February; nummonth=2;;

  Mar) month=March; nummonth=3;;

  Apr) month=April; nummonth=4;;

  May) month=May; nummonth=5;;

  Jun) month=June; nummonth=6;;

  Jul) month=July; nummonth=7;;

  Aug) month=August; nummonth=8;;

  Sep) month=September; nummonth=9;;

  Oct) month=October; nummonth=10;;

  Nov) month=November; nummonth=11;;

  Dec) month=December; nummonth=12;;

esac

case $3 in

  ???*) day=$1;;

  *) day=$3; shift;;

esac

# Here we have to deal with the problem that the ls output gives either

# the time of day or the year.

case $3 in

  *:*) set `date`; eval year=\$$#

       case $2 in

	 Jan) nummonthtod=1;;

	 Feb) nummonthtod=2;;

	 Mar) nummonthtod=3;;

	 Apr) nummonthtod=4;;

	 May) nummonthtod=5;;

	 Jun) nummonthtod=6;;

	 Jul) nummonthtod=7;;

	 Aug) nummonthtod=8;;

	 Sep) nummonthtod=9;;

	 Oct) nummonthtod=10;;

	 Nov) nummonthtod=11;;

	 Dec) nummonthtod=12;;

       esac

       # For the first six month of the year the time notation can also

       # be used for files modified in the last year.

       if (expr $nummonth \> $nummonthtod) > /dev/null;

       then

	 year=`expr $year - 1`

       fi;;

  *) year=$3;;

esac

# The result.

echo $day $month $year

# Local Variables:

# mode: shell-script

# sh-indentation: 2

# eval: (add-hook 'before-save-hook 'time-stamp)

# time-stamp-start: "scriptversion="

# time-stamp-format: "%:y-%02m-%02d.%02H"

# time-stamp-time-zone: "UTC0"

# time-stamp-end: "; # UTC"

# End: