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#!/usr/bin/perl -w
eval 'exec /usr/bin/perl -w -S $0 ${1+"$@"}'
if 0; # not running under some shell
# Copyright (c) 2009-2013 Sullivan Beck. All rights reserved.
# This program is free software; you can redistribute it and/or modify it
# under the same terms as Perl itself.
###############################################################################
###############################################################################
require 5.010000;
use Date::Manip::Date;
use IO::File;
use strict;
use warnings;
###############################################################################
# HELP
###############################################################################
our($usage);
my $COM = $0;
$COM =~ s/^.*\///;
$usage=
"usage: $COM OPTIONS
-h/--help : Print help.
Options to tell which date to print (only one of
the following should be entered... if none are,
'now' is printed).
-d/--date=STRING : Print information about that date.
-f/--file=FILE : Print out each date (1/line) in FILE
-r/--reference=FILE
: Print out the last modification
time of FILE
Other options
-R/--rfc-2822 : Print the date in RFC 2822 format
(any +FORMAT string is ignored)
Mon, 07 Aug 2006 12:34:56 -0600
-u/--utc/--universal:
Converts date(s) to UT time.
";
=pod
=head1 NAME
dm_date - print out the system date and time
=head1 SYNOPSIS
This performs the same operation as the unix 'date' command, but using
the Date::Manip module.
dm_date [OPTION]... [+FORMAT]
=head1 DESCRIPTION
This displays information about the current system time, or some
other time. Options are:
=over 4
=item -h, --help
Print online help.
=item -d STRING, --date=STRING
Display time described by STRING. STRING can be any string which can
be parsed by Date::Manip. Please refer to the Date::Manip::Date
documentation for details.
=item -f DATEFILE, --file=DATEFILE
This reads each line in DATEFILE, and extracts a date from it and
prints out the information.
Blank lines and lines starting with a pound (#) are ignored. Lines
not containing a valid date are also ignored.
=item -r FILE, --reference=FILE
Displays the last modification time of FILE.
=item -R, --rfc-2822
Displayc the date and time in RFC 2822 format.
Example: Mon, 07 Aug 2006 12:34:56 -0600
=item -u, --utc, --universal
Converts the date to UT (GMT) and prints out the information.
=back
Only one of -d, -f, or -r should be included. If more than
one is included, the first one from the list (-d, -f, -r)
is used and any other is ignored.
The format string starts with a plus (+) and contains any
of the format directives described in Date::Manip::Date.
=head1 KNOWN BUGS
None known.
=head1 BUGS AND QUESTIONS
Please refer to the Date::Manip::Problems documentation for
information on submitting bug reports or questions to the author.
=head1 SEE ALSO
Date::Manip::Date
=head1 LICENSE
This script is free software; you can redistribute it and/or
modify it under the same terms as Perl itself.
=head1 AUTHOR
Sullivan Beck (sbeck@cpan.org)
=cut
###############################################################################
# PARSE ARGUMENTS
###############################################################################
our($date,$file,$ref,$rfc,$ut,$format);
while ($_ = shift) {
(print $usage), exit if ($_ eq "-h" || $_ eq "--help");
$date = shift, next if ($_ eq "-d" || $_ eq "--date");
$date = $1, next if ($_ =~ /^\-\-date=(.*)/);
$file = shift, next if ($_ eq "-f" || $_ eq "--file");
$file = $1, next if ($_ =~ /^\-\-file=(.*)/);
$ref = shift, next if ($_ eq "-r" || $_ eq "--reference");
$ref = $1, next if ($_ =~ /^\-\-reference=(.*)/);
$rfc = 1, next if ($_ eq "-R" || $_ eq "--rfc-2822");
$ut = 1, next if ($_ eq "-u" || $_ eq "--utc" || $_ eq "--universal");
$format = $_, last if ($_ =~ s/^\+//);
die $usage;
}
if ($rfc) {
$format ='%a, %d %b %Y %H:%M:%S %z';
}
if (@ARGV || ! $format) {
die $usage;
}
############################################################################
# MAIN PROGRAM
############################################################################
my $d = new Date::Manip::Date;
if ($date) {
my $err = $d->parse($date);
exit 1 if ($err);
$d->convert("GMT") if ($ut);
print $d->printf($format),"\n";
} elsif ($file) {
my $in = new IO::File;
$in->open($file) || die "ERROR: unable to open date file: $file\n\n$usage";
my @in = <$in>;
$in->close();
chomp(@in);
foreach my $date (@in) {
$date =~ s/\#.*//;
$date =~ s/\s*$//;
next if (! $date);
my $err = $d->parse($date);
next if ($err);
$d->convert("GMT") if ($ut);
print $d->printf($format),"\n";
}
} elsif ($ref) {
if (-e $ref) {
my $date = ( stat($ref) )[9];
my $err = $d->parse("epoch $date");
exit if ($err);
$d->convert("GMT") if ($ut);
print $d->printf($format),"\n";
}
} else {
my $err = $d->parse("now");
exit 1 if ($err);
$d->convert("GMT") if ($ut);
print $d->printf($format),"\n";
}
# Local Variables:
# mode: cperl
# indent-tabs-mode: nil
# cperl-indent-level: 3
# cperl-continued-statement-offset: 2
# cperl-continued-brace-offset: 0
# cperl-brace-offset: 0
# cperl-brace-imaginary-offset: 0
# cperl-label-offset: 0
# End: