scripts/mdate-sh

   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@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, see <http://www.gnu.org/licenses/>.
  22 # As a special exception to the GNU General Public License, if you
  23 # distribute this file as part of a program that contains a
  24 # configuration script generated by Autoconf, you may include it under
  25 # the same distribution terms that you use for the rest of that program.
  26
  27 # This file is maintained in Automake, please report
  28 # bugs to <bug-automake@gnu.org> or send patches to
  29 # <automake-patches@gnu.org>.
  30
  31 case $1 in
  32   '')
  33      echo "$0: No file.  Try \`$0 --help' for more information." 1>&2
  34      exit 1;
  35      ;;
  36   -h | --h*)
  37     cat <<\EOF
  38 Usage: mdate-sh [--help] [--version] FILE
  39
  40 Pretty-print the modification time of FILE.
  41
  42 Report bugs to <bug-automake@gnu.org>.
  43 EOF
  44     exit $?
  45     ;;
  46   -v | --v*)
  47     echo "mdate-sh $scriptversion"
  48     exit $?
  49     ;;
  50 esac
  51
  52 # Prevent date giving response in another language.
  53 LANG=C
  54 export LANG
  55 LC_ALL=C
  56 export LC_ALL
  57 LC_TIME=C
  58 export LC_TIME
  59
  60 # GNU ls changes its time format in response to the TIME_STYLE
  61 # variable.  Since we cannot assume `unset' works, revert this
  62 # variable to its documented default.
  63 if test "${TIME_STYLE+set}" = set; then
  64   TIME_STYLE=posix-long-iso
  65   export TIME_STYLE
  66 fi
  67
  68 save_arg1=$1
  69
  70 # Find out how to get the extended ls output of a file or directory.
  71 if ls -L /dev/null 1>/dev/null 2>&1; then
  72   ls_command='ls -L -l -d'
  73 else
  74   ls_command='ls -l -d'
  75 fi
  76
  77 # A `ls -l' line looks as follows on OS/2.
  78 #  drwxrwx---        0 Aug 11  2001 foo
  79 # This differs from Unix, which adds ownership information.
  80 #  drwxrwx---   2 root  root      4096 Aug 11  2001 foo
  81 #
  82 # To find the date, we split the line on spaces and iterate on words
  83 # until we find a month.  This cannot work with files whose owner is a
  84 # user named `Jan', or `Feb', etc.  However, it's unlikely that `/'
  85 # will be owned by a user whose name is a month.  So we first look at
  86 # the extended ls output of the root directory to decide how many
  87 # words should be skipped to get the date.
  88
  89 # On HPUX /bin/sh, "set" interprets "-rw-r--r--" as options, so the "x" below.
  90 set x`ls -l -d /`
  91
  92 # Find which argument is the month.
  93 month=
  94 command=
  95 until test $month
  96 do
  97   shift
  98   # Add another shift to the command.
  99   command="$command shift;"
 100   case $1 in
 101     Jan) month=January; nummonth=1;;
 102     Feb) month=February; nummonth=2;;
 103     Mar) month=March; nummonth=3;;
 104     Apr) month=April; nummonth=4;;
 105     May) month=May; nummonth=5;;
 106     Jun) month=June; nummonth=6;;
 107     Jul) month=July; nummonth=7;;
 108     Aug) month=August; nummonth=8;;
 109     Sep) month=September; nummonth=9;;
 110     Oct) month=October; nummonth=10;;
 111     Nov) month=November; nummonth=11;;
 112     Dec) month=December; nummonth=12;;
 113   esac
 114 done
 115
 116 # Get the extended ls output of the file or directory.
 117 set dummy x`eval "$ls_command \"\$save_arg1\""`
 118
 119 # Remove all preceding arguments
 120 eval $command
 121
 122 # Because of the dummy argument above, month is in $2.
 123 #
 124 # On a POSIX system, we should have
 125 #
 126 # $# = 5
 127 # $1 = file size
 128 # $2 = month
 129 # $3 = day
 130 # $4 = year or time
 131 # $5 = filename
 132 #
 133 # On Darwin 7.7.0 and 7.6.0, we have
 134 #
 135 # $# = 4
 136 # $1 = day
 137 # $2 = month
 138 # $3 = year or time
 139 # $4 = filename
 140
 141 # Get the month.
 142 case $2 in
 143   Jan) month=January; nummonth=1;;
 144   Feb) month=February; nummonth=2;;
 145   Mar) month=March; nummonth=3;;
 146   Apr) month=April; nummonth=4;;
 147   May) month=May; nummonth=5;;
 148   Jun) month=June; nummonth=6;;
 149   Jul) month=July; nummonth=7;;
 150   Aug) month=August; nummonth=8;;
 151   Sep) month=September; nummonth=9;;
 152   Oct) month=October; nummonth=10;;
 153   Nov) month=November; nummonth=11;;
 154   Dec) month=December; nummonth=12;;
 155 esac
 156
 157 case $3 in
 158   ???*) day=$1;;
 159   *) day=$3; shift;;
 160 esac
 161
 162 # Here we have to deal with the problem that the ls output gives either
 163 # the time of day or the year.
 164 case $3 in
 165   *:*) set `date`; eval year=\$$#
 166        case $2 in
 167          Jan) nummonthtod=1;;
 168          Feb) nummonthtod=2;;
 169          Mar) nummonthtod=3;;
 170          Apr) nummonthtod=4;;
 171          May) nummonthtod=5;;
 172          Jun) nummonthtod=6;;
 173          Jul) nummonthtod=7;;
 174          Aug) nummonthtod=8;;
 175          Sep) nummonthtod=9;;
 176          Oct) nummonthtod=10;;
 177          Nov) nummonthtod=11;;
 178          Dec) nummonthtod=12;;
 179        esac
 180        # For the first six month of the year the time notation can also
 181        # be used for files modified in the last year.
 182        if (expr $nummonth \> $nummonthtod) > /dev/null;
 183        then
 184          year=`expr $year - 1`
 185        fi;;
 186   *) year=$3;;
 187 esac
 188
 189 # The result.
 190 echo $day $month $year
 191
 192 # Local Variables:
 193 # mode: shell-script
 194 # sh-indentation: 2
 195 # eval: (add-hook 'write-file-hooks 'time-stamp)
 196 # time-stamp-start: "scriptversion="
 197 # time-stamp-format: "%:y-%02m-%02d.%02H"
 198 # time-stamp-end: "$"
 199 # End: