Blame autoconf/mdate-sh

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#!/bin/sh
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# Get modification time of a file or directory and pretty-print it.
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scriptversion=2010-08-21.06; # UTC
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# Copyright (C) 1995-2014 Free Software Foundation, Inc.
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# written by Ulrich Drepper <drepper@gnu.ai.mit.edu>, June 1995
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2, or (at your option)
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# any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program.  If not, see <http://www.gnu.org/licenses/>.
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# As a special exception to the GNU General Public License, if you
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# distribute this file as part of a program that contains a
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# configuration script generated by Autoconf, you may include it under
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# the same distribution terms that you use for the rest of that program.
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# This file is maintained in Automake, please report
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# bugs to <bug-automake@gnu.org> or send patches to
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# <automake-patches@gnu.org>.
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if test -n "${ZSH_VERSION+set}" && (emulate sh) >/dev/null 2>&1; then
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  emulate sh
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  NULLCMD=:
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  # Pre-4.2 versions of Zsh do word splitting on ${1+"$@"}, which
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  # is contrary to our usage.  Disable this feature.
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  alias -g '${1+"$@"}'='"$@"'
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  setopt NO_GLOB_SUBST
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fi
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case $1 in
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  '')
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     echo "$0: No file.  Try '$0 --help' for more information." 1>&2
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     exit 1;
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     ;;
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  -h | --h*)
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    cat <<\EOF
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Usage: mdate-sh [--help] [--version] FILE
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Pretty-print the modification day of FILE, in the format:
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1 January 1970
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Report bugs to <bug-automake@gnu.org>.
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EOF
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    exit $?
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    ;;
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  -v | --v*)
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    echo "mdate-sh $scriptversion"
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    exit $?
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    ;;
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esac
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error ()
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{
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  echo "$0: $1" >&2
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  exit 1
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}
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# Prevent date giving response in another language.
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LANG=C
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export LANG
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LC_ALL=C
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export LC_ALL
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LC_TIME=C
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export LC_TIME
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# GNU ls changes its time format in response to the TIME_STYLE
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# variable.  Since we cannot assume 'unset' works, revert this
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# variable to its documented default.
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if test "${TIME_STYLE+set}" = set; then
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  TIME_STYLE=posix-long-iso
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  export TIME_STYLE
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fi
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save_arg1=$1
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# Find out how to get the extended ls output of a file or directory.
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if ls -L /dev/null 1>/dev/null 2>&1; then
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  ls_command='ls -L -l -d'
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else
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  ls_command='ls -l -d'
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fi
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# Avoid user/group names that might have spaces, when possible.
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if ls -n /dev/null 1>/dev/null 2>&1; then
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  ls_command="$ls_command -n"
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fi
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# A 'ls -l' line looks as follows on OS/2.
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#  drwxrwx---        0 Aug 11  2001 foo
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# This differs from Unix, which adds ownership information.
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#  drwxrwx---   2 root  root      4096 Aug 11  2001 foo
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#
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# To find the date, we split the line on spaces and iterate on words
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# until we find a month.  This cannot work with files whose owner is a
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# user named "Jan", or "Feb", etc.  However, it's unlikely that '/'
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# will be owned by a user whose name is a month.  So we first look at
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# the extended ls output of the root directory to decide how many
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# words should be skipped to get the date.
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# On HPUX /bin/sh, "set" interprets "-rw-r--r--" as options, so the "x" below.
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set x`$ls_command /`
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# Find which argument is the month.
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month=
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command=
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until test $month
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do
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  test $# -gt 0 || error "failed parsing '$ls_command /' output"
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  shift
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  # Add another shift to the command.
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  command="$command shift;"
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  case $1 in
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    Jan) month=January; nummonth=1;;
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    Feb) month=February; nummonth=2;;
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    Mar) month=March; nummonth=3;;
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    Apr) month=April; nummonth=4;;
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    May) month=May; nummonth=5;;
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    Jun) month=June; nummonth=6;;
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    Jul) month=July; nummonth=7;;
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    Aug) month=August; nummonth=8;;
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    Sep) month=September; nummonth=9;;
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    Oct) month=October; nummonth=10;;
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    Nov) month=November; nummonth=11;;
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    Dec) month=December; nummonth=12;;
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  esac
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done
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test -n "$month" || error "failed parsing '$ls_command /' output"
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# Get the extended ls output of the file or directory.
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set dummy x`eval "$ls_command \"\\\$save_arg1\""`
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# Remove all preceding arguments
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eval $command
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# Because of the dummy argument above, month is in $2.
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#
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# On a POSIX system, we should have
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#
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# $# = 5
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# $1 = file size
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# $2 = month
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# $3 = day
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# $4 = year or time
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# $5 = filename
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#
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# On Darwin 7.7.0 and 7.6.0, we have
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#
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# $# = 4
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# $1 = day
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# $2 = month
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# $3 = year or time
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# $4 = filename
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# Get the month.
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case $2 in
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  Jan) month=January; nummonth=1;;
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  Feb) month=February; nummonth=2;;
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  Mar) month=March; nummonth=3;;
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  Apr) month=April; nummonth=4;;
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  May) month=May; nummonth=5;;
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  Jun) month=June; nummonth=6;;
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  Jul) month=July; nummonth=7;;
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  Aug) month=August; nummonth=8;;
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  Sep) month=September; nummonth=9;;
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  Oct) month=October; nummonth=10;;
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  Nov) month=November; nummonth=11;;
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  Dec) month=December; nummonth=12;;
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esac
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case $3 in
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  ???*) day=$1;;
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  *) day=$3; shift;;
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esac
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# Here we have to deal with the problem that the ls output gives either
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# the time of day or the year.
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case $3 in
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  *:*) set `date`; eval year=\$$#
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       case $2 in
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	 Jan) nummonthtod=1;;
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	 Feb) nummonthtod=2;;
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	 Mar) nummonthtod=3;;
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	 Apr) nummonthtod=4;;
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	 May) nummonthtod=5;;
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	 Jun) nummonthtod=6;;
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	 Jul) nummonthtod=7;;
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	 Aug) nummonthtod=8;;
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	 Sep) nummonthtod=9;;
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	 Oct) nummonthtod=10;;
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	 Nov) nummonthtod=11;;
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	 Dec) nummonthtod=12;;
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       esac
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       # For the first six month of the year the time notation can also
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       # be used for files modified in the last year.
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       if (expr $nummonth \> $nummonthtod) > /dev/null;
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       then
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	 year=`expr $year - 1`
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       fi;;
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  *) year=$3;;
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esac
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# The result.
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echo $day $month $year
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# Local Variables:
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# mode: shell-script
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# sh-indentation: 2
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# eval: (add-hook 'write-file-hooks 'time-stamp)
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# time-stamp-start: "scriptversion="
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# time-stamp-format: "%:y-%02m-%02d.%02H"
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# time-stamp-time-zone: "UTC"
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# time-stamp-end: "; # UTC"
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# End: