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