docs/mdate-sh

   1 #!/bin/sh
   2 # Get modification time of a file or directory and pretty-print it.
   3
   4 scriptversion=2007-03-30.02
   5
   6 # Copyright (C) 1995, 1996, 1997, 2003, 2004, 2005, 2007 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, 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@gnu.org> or send patches to
  31 # <automake-patches@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@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=$1
  71
  72 # Find out how to get the extended ls output of a file or directory.
  73 if ls -L /dev/null 1>/dev/null 2>&1; then
  74   ls_command='ls -L -l -d'
  75 else
  76   ls_command='ls -l -d'
  77 fi
  78 # Avoid user/group names that might have spaces, when possible.
  79 if ls -n /dev/null 1>/dev/null 2>&1; then
  80   ls_command="$ls_command -n"
  81 fi
  82
  83 # A `ls -l' line looks as follows on OS/2.
  84 #  drwxrwx---        0 Aug 11  2001 foo
  85 # This differs from Unix, which adds ownership information.
  86 #  drwxrwx---   2 root  root      4096 Aug 11  2001 foo
  87 #
  88 # To find the date, we split the line on spaces and iterate on words
  89 # until we find a month.  This cannot work with files whose owner is a
  90 # user named `Jan', or `Feb', etc.  However, it's unlikely that `/'
  91 # will be owned by a user whose name is a month.  So we first look at
  92 # the extended ls output of the root directory to decide how many
  93 # words should be skipped to get the date.
  94
  95 # On HPUX /bin/sh, "set" interprets "-rw-r--r--" as options, so the "x" below.
  96 set x`$ls_command /`
  97
  98 # Find which argument is the month.
  99 month=
 100 command=
 101 until test $month
 102 do
 103   shift
 104   # Add another shift to the command.
 105   command="$command shift;"
 106   case $1 in
 107     Jan) month=January; nummonth=1;;
 108     Feb) month=February; nummonth=2;;
 109     Mar) month=March; nummonth=3;;
 110     Apr) month=April; nummonth=4;;
 111     May) month=May; nummonth=5;;
 112     Jun) month=June; nummonth=6;;
 113     Jul) month=July; nummonth=7;;
 114     Aug) month=August; nummonth=8;;
 115     Sep) month=September; nummonth=9;;
 116     Oct) month=October; nummonth=10;;
 117     Nov) month=November; nummonth=11;;
 118     Dec) month=December; nummonth=12;;
 119   esac
 120 done
 121
 122 # Get the extended ls output of the file or directory.
 123 set dummy x`eval "$ls_command \"\$save_arg1\""`
 124
 125 # Remove all preceding arguments
 126 eval $command
 127
 128 # Because of the dummy argument above, month is in $2.
 129 #
 130 # On a POSIX system, we should have
 131 #
 132 # $# = 5
 133 # $1 = file size
 134 # $2 = month
 135 # $3 = day
 136 # $4 = year or time
 137 # $5 = filename
 138 #
 139 # On Darwin 7.7.0 and 7.6.0, we have
 140 #
 141 # $# = 4
 142 # $1 = day
 143 # $2 = month
 144 # $3 = year or time
 145 # $4 = filename
 146
 147 # Get the month.
 148 case $2 in
 149   Jan) month=January; nummonth=1;;
 150   Feb) month=February; nummonth=2;;
 151   Mar) month=March; nummonth=3;;
 152   Apr) month=April; nummonth=4;;
 153   May) month=May; nummonth=5;;
 154   Jun) month=June; nummonth=6;;
 155   Jul) month=July; nummonth=7;;
 156   Aug) month=August; nummonth=8;;
 157   Sep) month=September; nummonth=9;;
 158   Oct) month=October; nummonth=10;;
 159   Nov) month=November; nummonth=11;;
 160   Dec) month=December; nummonth=12;;
 161 esac
 162
 163 case $3 in
 164   ???*) day=$1;;
 165   *) day=$3; shift;;
 166 esac
 167
 168 # Here we have to deal with the problem that the ls output gives either
 169 # the time of day or the year.
 170 case $3 in
 171   *:*) set `date`; eval year=\$$#
 172        case $2 in
 173          Jan) nummonthtod=1;;
 174          Feb) nummonthtod=2;;
 175          Mar) nummonthtod=3;;
 176          Apr) nummonthtod=4;;
 177          May) nummonthtod=5;;
 178          Jun) nummonthtod=6;;
 179          Jul) nummonthtod=7;;
 180          Aug) nummonthtod=8;;
 181          Sep) nummonthtod=9;;
 182          Oct) nummonthtod=10;;
 183          Nov) nummonthtod=11;;
 184          Dec) nummonthtod=12;;
 185        esac
 186        # For the first six month of the year the time notation can also
 187        # be used for files modified in the last year.
 188        if (expr $nummonth \> $nummonthtod) > /dev/null;
 189        then
 190          year=`expr $year - 1`
 191        fi;;
 192   *) year=$3;;
 193 esac
 194
 195 # The result.
 196 echo $day $month $year
 197
 198 # Local Variables:
 199 # mode: shell-script
 200 # sh-indentation: 2
 201 # eval: (add-hook 'write-file-hooks 'time-stamp)
 202 # time-stamp-start: "scriptversion="
 203 # time-stamp-format: "%:y-%02m-%02d.%02H"
 204 # time-stamp-end: "$"
 205 # End: