Home | History | Annotate | Download | only in build-aux
      1 #!/bin/sh
      2 # Get modification time of a file or directory and pretty-print it.
      3 
      4 scriptversion=2005-06-29.22
      5 
      6 # Copyright (C) 1995, 1996, 1997, 2003, 2004, 2005 Free Software
      7 # Foundation, Inc.
      8 # written by Ulrich Drepper <drepper (at] gnu.ai.mit.edu>, June 1995
      9 #
     10 # This program is free software; you can redistribute it and/or modify
     11 # it under the terms of the GNU General Public License as published by
     12 # the Free Software Foundation; either version 2, or (at your option)
     13 # any later version.
     14 #
     15 # This program is distributed in the hope that it will be useful,
     16 # but WITHOUT ANY WARRANTY; without even the implied warranty of
     17 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     18 # GNU General Public License for more details.
     19 #
     20 # You should have received a copy of the GNU General Public License
     21 # along with this program; if not, write to the Free Software Foundation,
     22 # Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
     23 
     24 # As a special exception to the GNU General Public License, if you
     25 # distribute this file as part of a program that contains a
     26 # configuration script generated by Autoconf, you may include it under
     27 # the same distribution terms that you use for the rest of that program.
     28 
     29 # This file is maintained in Automake, please report
     30 # bugs to <bug-automake (at] gnu.org> or send patches to
     31 # <automake-patches (at] gnu.org>.
     32 
     33 case $1 in
     34   '')
     35      echo "$0: No file.  Try \`$0 --help' for more information." 1>&2
     36      exit 1;
     37      ;;
     38   -h | --h*)
     39     cat <<\EOF
     40 Usage: mdate-sh [--help] [--version] FILE
     41 
     42 Pretty-print the modification time of FILE.
     43 
     44 Report bugs to <bug-automake (at] gnu.org>.
     45 EOF
     46     exit $?
     47     ;;
     48   -v | --v*)
     49     echo "mdate-sh $scriptversion"
     50     exit $?
     51     ;;
     52 esac
     53 
     54 # Prevent date giving response in another language.
     55 LANG=C
     56 export LANG
     57 LC_ALL=C
     58 export LC_ALL
     59 LC_TIME=C
     60 export LC_TIME
     61 
     62 # GNU ls changes its time format in response to the TIME_STYLE
     63 # variable.  Since we cannot assume `unset' works, revert this
     64 # variable to its documented default.
     65 if test "${TIME_STYLE+set}" = set; then
     66   TIME_STYLE=posix-long-iso
     67   export TIME_STYLE
     68 fi
     69 
     70 save_arg1=$1
     71 
     72 # Find out how to get the extended ls output of a file or directory.
     73 if ls -L /dev/null 1>/dev/null 2>&1; then
     74   ls_command='ls -L -l -d'
     75 else
     76   ls_command='ls -l -d'
     77 fi
     78 
     79 # A `ls -l' line looks as follows on OS/2.
     80 #  drwxrwx---        0 Aug 11  2001 foo
     81 # This differs from Unix, which adds ownership information.
     82 #  drwxrwx---   2 root  root      4096 Aug 11  2001 foo
     83 #
     84 # To find the date, we split the line on spaces and iterate on words
     85 # until we find a month.  This cannot work with files whose owner is a
     86 # user named `Jan', or `Feb', etc.  However, it's unlikely that `/'
     87 # will be owned by a user whose name is a month.  So we first look at
     88 # the extended ls output of the root directory to decide how many
     89 # words should be skipped to get the date.
     90 
     91 # On HPUX /bin/sh, "set" interprets "-rw-r--r--" as options, so the "x" below.
     92 set x`ls -l -d /`
     93 
     94 # Find which argument is the month.
     95 month=
     96 command=
     97 until test $month
     98 do
     99   shift
    100   # Add another shift to the command.
    101   command="$command shift;"
    102   case $1 in
    103     Jan) month=January; nummonth=1;;
    104     Feb) month=February; nummonth=2;;
    105     Mar) month=March; nummonth=3;;
    106     Apr) month=April; nummonth=4;;
    107     May) month=May; nummonth=5;;
    108     Jun) month=June; nummonth=6;;
    109     Jul) month=July; nummonth=7;;
    110     Aug) month=August; nummonth=8;;
    111     Sep) month=September; nummonth=9;;
    112     Oct) month=October; nummonth=10;;
    113     Nov) month=November; nummonth=11;;
    114     Dec) month=December; nummonth=12;;
    115   esac
    116 done
    117 
    118 # Get the extended ls output of the file or directory.
    119 set dummy x`eval "$ls_command \"\$save_arg1\""`
    120 
    121 # Remove all preceding arguments
    122 eval $command
    123 
    124 # Because of the dummy argument above, month is in $2.
    125 #
    126 # On a POSIX system, we should have
    127 #
    128 # $# = 5
    129 # $1 = file size
    130 # $2 = month
    131 # $3 = day
    132 # $4 = year or time
    133 # $5 = filename
    134 #
    135 # On Darwin 7.7.0 and 7.6.0, we have
    136 #
    137 # $# = 4
    138 # $1 = day
    139 # $2 = month
    140 # $3 = year or time
    141 # $4 = filename
    142 
    143 # Get the month.
    144 case $2 in
    145   Jan) month=January; nummonth=1;;
    146   Feb) month=February; nummonth=2;;
    147   Mar) month=March; nummonth=3;;
    148   Apr) month=April; nummonth=4;;
    149   May) month=May; nummonth=5;;
    150   Jun) month=June; nummonth=6;;
    151   Jul) month=July; nummonth=7;;
    152   Aug) month=August; nummonth=8;;
    153   Sep) month=September; nummonth=9;;
    154   Oct) month=October; nummonth=10;;
    155   Nov) month=November; nummonth=11;;
    156   Dec) month=December; nummonth=12;;
    157 esac
    158 
    159 case $3 in
    160   ???*) day=$1;;
    161   *) day=$3; shift;;
    162 esac
    163 
    164 # Here we have to deal with the problem that the ls output gives either
    165 # the time of day or the year.
    166 case $3 in
    167   *:*) set `date`; eval year=\$$#
    168        case $2 in
    169 	 Jan) nummonthtod=1;;
    170 	 Feb) nummonthtod=2;;
    171 	 Mar) nummonthtod=3;;
    172 	 Apr) nummonthtod=4;;
    173 	 May) nummonthtod=5;;
    174 	 Jun) nummonthtod=6;;
    175 	 Jul) nummonthtod=7;;
    176 	 Aug) nummonthtod=8;;
    177 	 Sep) nummonthtod=9;;
    178 	 Oct) nummonthtod=10;;
    179 	 Nov) nummonthtod=11;;
    180 	 Dec) nummonthtod=12;;
    181        esac
    182        # For the first six month of the year the time notation can also
    183        # be used for files modified in the last year.
    184        if (expr $nummonth \> $nummonthtod) > /dev/null;
    185        then
    186 	 year=`expr $year - 1`
    187        fi;;
    188   *) year=$3;;
    189 esac
    190 
    191 # The result.
    192 echo $day $month $year
    193 
    194 # Local Variables:
    195 # mode: shell-script
    196 # sh-indentation: 2
    197 # eval: (add-hook 'write-file-hooks 'time-stamp)
    198 # time-stamp-start: "scriptversion="
    199 # time-stamp-format: "%:y-%02m-%02d.%02H"
    200 # time-stamp-end: "$"
    201 # End:
    202