lib/mdate-sh

   1 #!/bin/sh
   2 # Get modification time of a file or directory and pretty-print it.
   3
   4 scriptversion=2003-11-09.00
   5
   6 # Copyright (C) 1995, 1996, 1997, 2003  Free Software Foundation, Inc.
   7 # written by Ulrich Drepper <drepper@gnu.ai.mit.edu>, June 1995
   8 #
   9 # This program is free software; you can redistribute it and/or modify
  10 # it under the terms of the GNU General Public License as published by
  11 # the Free Software Foundation; either version 2, or (at your option)
  12 # any later version.
  13 #
  14 # This program is distributed in the hope that it will be useful,
  15 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 # GNU General Public License for more details.
  18 #
  19 # You should have received a copy of the GNU General Public License
  20 # along with this program; if not, write to the Free Software Foundation,
  21 # Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  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 0
  46     ;;
  47   -v | --v*)
  48     echo "mdate-sh $scriptversion"
  49     exit 0
  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 save_arg1="$1"
  62
  63 # Find out how to get the extended ls output of a file or directory.
  64 if ls -L /dev/null 1>/dev/null 2>&1; then
  65   ls_command='ls -L -l -d'
  66 else
  67   ls_command='ls -l -d'
  68 fi
  69
  70 # A `ls -l' line looks as follows on OS/2.
  71 #  drwxrwx---        0 Aug 11  2001 foo
  72 # This differs from Unix, which adds ownership information.
  73 #  drwxrwx---   2 root  root      4096 Aug 11  2001 foo
  74 #
  75 # To find the date, we split the line on spaces and iterate on words
  76 # until we find a month.  This cannot work with files whose owner is a
  77 # user named `Jan', or `Feb', etc.  However, it's unlikely that `/'
  78 # will be owned by a user whose name is a month.  So we first look at
  79 # the extended ls output of the root directory to decide how many
  80 # words should be skipped to get the date.
  81
  82 # On HPUX /bin/sh, "set" interprets "-rw-r--r--" as options, so the "x" below.
  83 set - x`$ls_command /`
  84
  85 # Find which argument is the month.
  86 month=
  87 command=
  88 until test $month
  89 do
  90   shift
  91   # Add another shift to the command.
  92   command="$command shift;"
  93   case $1 in
  94     Jan) month=January; nummonth=1;;
  95     Feb) month=February; nummonth=2;;
  96     Mar) month=March; nummonth=3;;
  97     Apr) month=April; nummonth=4;;
  98     May) month=May; nummonth=5;;
  99     Jun) month=June; nummonth=6;;
 100     Jul) month=July; nummonth=7;;
 101     Aug) month=August; nummonth=8;;
 102     Sep) month=September; nummonth=9;;
 103     Oct) month=October; nummonth=10;;
 104     Nov) month=November; nummonth=11;;
 105     Dec) month=December; nummonth=12;;
 106   esac
 107 done
 108
 109 # Get the extended ls output of the file or directory.
 110 set - x`eval "$ls_command \"\$save_arg1\""`
 111
 112 # Remove all preceding arguments
 113 eval $command
 114
 115 # Get the month.  Next argument is day, followed by the year or time.
 116 case $1 in
 117   Jan) month=January; nummonth=1;;
 118   Feb) month=February; nummonth=2;;
 119   Mar) month=March; nummonth=3;;
 120   Apr) month=April; nummonth=4;;
 121   May) month=May; nummonth=5;;
 122   Jun) month=June; nummonth=6;;
 123   Jul) month=July; nummonth=7;;
 124   Aug) month=August; nummonth=8;;
 125   Sep) month=September; nummonth=9;;
 126   Oct) month=October; nummonth=10;;
 127   Nov) month=November; nummonth=11;;
 128   Dec) month=December; nummonth=12;;
 129 esac
 130
 131 day=$2
 132
 133 # Here we have to deal with the problem that the ls output gives either
 134 # the time of day or the year.
 135 case $3 in
 136   *:*) set `date`; eval year=\$$#
 137        case $2 in
 138          Jan) nummonthtod=1;;
 139          Feb) nummonthtod=2;;
 140          Mar) nummonthtod=3;;
 141          Apr) nummonthtod=4;;
 142          May) nummonthtod=5;;
 143          Jun) nummonthtod=6;;
 144          Jul) nummonthtod=7;;
 145          Aug) nummonthtod=8;;
 146          Sep) nummonthtod=9;;
 147          Oct) nummonthtod=10;;
 148          Nov) nummonthtod=11;;
 149          Dec) nummonthtod=12;;
 150        esac
 151        # For the first six month of the year the time notation can also
 152        # be used for files modified in the last year.
 153        if (expr $nummonth \> $nummonthtod) > /dev/null;
 154        then
 155          year=`expr $year - 1`
 156        fi;;
 157   *) year=$3;;
 158 esac
 159
 160 # The result.
 161 echo $day $month $year
 162
 163 # Local Variables:
 164 # mode: shell-script
 165 # sh-indentation: 2
 166 # eval: (add-hook 'write-file-hooks 'time-stamp)
 167 # time-stamp-start: "scriptversion="
 168 # time-stamp-format: "%:y-%02m-%02d.%02H"
 169 # time-stamp-end: "$"
 170 # End: