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, 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
32case $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
39Usage: mdate-sh [--help] [--version] FILE
40
41Pretty-print the modification time of FILE.
42
43Report bugs to <bug-automake@gnu.org>.
44EOF
45    exit $?
46    ;;
47  -v | --v*)
48    echo "mdate-sh $scriptversion"
49    exit $?
50    ;;
51esac
52
53# Prevent date giving response in another language.
54LANG=C
55export LANG
56LC_ALL=C
57export LC_ALL
58LC_TIME=C
59export LC_TIME
60
61# GNU ls changes its time format in response to the TIME_STYLE
62# variable.  Since we cannot assume `unset' works, revert this
63# variable to its documented default.
64if test "${TIME_STYLE+set}" = set; then
65  TIME_STYLE=posix-long-iso
66  export TIME_STYLE
67fi
68
69save_arg1=$1
70
71# Find out how to get the extended ls output of a file or directory.
72if ls -L /dev/null 1>/dev/null 2>&1; then
73  ls_command='ls -L -l -d'
74else
75  ls_command='ls -l -d'
76fi
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.
91set x`ls -l -d /`
92
93# Find which argument is the month.
94month=
95command=
96until test $month
97do
98  shift
99  # Add another shift to the command.
100  command="$command shift;"
101  case $1 in
102    Jan) month=January; nummonth=1;;
103    Feb) month=February; nummonth=2;;
104    Mar) month=March; nummonth=3;;
105    Apr) month=April; nummonth=4;;
106    May) month=May; nummonth=5;;
107    Jun) month=June; nummonth=6;;
108    Jul) month=July; nummonth=7;;
109    Aug) month=August; nummonth=8;;
110    Sep) month=September; nummonth=9;;
111    Oct) month=October; nummonth=10;;
112    Nov) month=November; nummonth=11;;
113    Dec) month=December; nummonth=12;;
114  esac
115done
116
117# Get the extended ls output of the file or directory.
118set dummy x`eval "$ls_command \"\$save_arg1\""`
119
120# Remove all preceding arguments
121eval $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.
143case $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;;
156esac
157
158case $3 in
159  ???*) day=$1;;
160  *) day=$3; shift;;
161esac
162
163# Here we have to deal with the problem that the ls output gives either
164# the time of day or the year.
165case $3 in
166  *:*) set `date`; eval year=\$$#
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;;
188esac
189
190# The result.
191echo $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:
201