1#!/bin/sh
2# Get modification time of a file or directory and pretty-print it.
3
4scriptversion=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
33case $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
40Usage: mdate-sh [--help] [--version] FILE
41
42Pretty-print the modification time of FILE.
43
44Report bugs to <bug-automake@gnu.org>.
45EOF
46    exit $?
47    ;;
48  -v | --v*)
49    echo "mdate-sh $scriptversion"
50    exit $?
51    ;;
52esac
53
54# Prevent date giving response in another language.
55LANG=C
56export LANG
57LC_ALL=C
58export LC_ALL
59LC_TIME=C
60export LC_TIME
61
62# GNU ls changes its time format in response to the TIME_STYLE
63# variable.  Since we cannot assume `unset' works, revert this
64# variable to its documented default.
65if test "${TIME_STYLE+set}" = set; then
66  TIME_STYLE=posix-long-iso
67  export TIME_STYLE
68fi
69
70save_arg1=$1
71
72# Find out how to get the extended ls output of a file or directory.
73if ls -L /dev/null 1>/dev/null 2>&1; then
74  ls_command='ls -L -l -d'
75else
76  ls_command='ls -l -d'
77fi
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.
92set x`ls -l -d /`
93
94# Find which argument is the month.
95month=
96command=
97until test $month
98do
99  shift
100  # Add another shift to the command.
101  command="$command shift;"
102  case $1 in
103    Jan) month=January; nummonth=1;;
104    Feb) month=February; nummonth=2;;
105    Mar) month=March; nummonth=3;;
106    Apr) month=April; nummonth=4;;
107    May) month=May; nummonth=5;;
108    Jun) month=June; nummonth=6;;
109    Jul) month=July; nummonth=7;;
110    Aug) month=August; nummonth=8;;
111    Sep) month=September; nummonth=9;;
112    Oct) month=October; nummonth=10;;
113    Nov) month=November; nummonth=11;;
114    Dec) month=December; nummonth=12;;
115  esac
116done
117
118# Get the extended ls output of the file or directory.
119set dummy x`eval "$ls_command \"\$save_arg1\""`
120
121# Remove all preceding arguments
122eval $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.
144case $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;;
157esac
158
159case $3 in
160  ???*) day=$1;;
161  *) day=$3; shift;;
162esac
163
164# Here we have to deal with the problem that the ls output gives either
165# the time of day or the year.
166case $3 in
167  *:*) set `date`; eval year=\$$#
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;;
189esac
190
191# The result.
192echo $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:
202