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 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@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
  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: