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#============================================================= -*-Perl-*-
#
# Template::Plugin::Date
#
# DESCRIPTION
#
# Plugin to generate formatted date strings.
#
# AUTHORS
# Thierry-Michel Barral <kktos@electron-libre.com>
# Andy Wardley <abw@wardley.org>
#
# COPYRIGHT
# Copyright (C) 2000-2007 Thierry-Michel Barral, Andy Wardley.
#
# This module is free software; you can redistribute it and/or
# modify it under the same terms as Perl itself.
#
#============================================================================
package Template::Plugin::Date;
use strict;
use warnings;
use base 'Template::Plugin';
use POSIX ();
use Config ();
use constant HAS_SETLOCALE => $Config::Config{d_setlocale};
our $VERSION = 2.78;
our $FORMAT = '%H:%M:%S %d-%b-%Y'; # default strftime() format
our @LOCALE_SUFFIX = qw( .ISO8859-1 .ISO_8859-15 .US-ASCII .UTF-8 );
#------------------------------------------------------------------------
# new(\%options)
#------------------------------------------------------------------------
sub new {
my ($class, $context, $params) = @_;
bless {
$params ? %$params : ()
}, $class;
}
#------------------------------------------------------------------------
# now()
#
# Call time() to return the current system time in seconds since the epoch.
#------------------------------------------------------------------------
sub now {
return time();
}
#------------------------------------------------------------------------
# format()
# format($time)
# format($time, $format)
# format($time, $format, $locale)
# format($time, $format, $locale, $gmt_flag)
# format(\%named_params);
#
# Returns a formatted time/date string for the specified time, $time,
# (or the current system time if unspecified) using the $format, $locale,
# and $gmt values specified as arguments or internal values set defined
# at construction time). Specifying a Perl-true value for $gmt will
# override the local time zone and force the output to be for GMT.
# Any or all of the arguments may be specified as named parameters which
# get passed as a hash array reference as the final argument.
# ------------------------------------------------------------------------
sub format {
my $self = shift;
my $params = ref($_[$#_]) eq 'HASH' ? pop(@_) : { };
my $time = shift(@_) || $params->{ time } || $self->{ time }
|| $self->now();
my $format = @_ ? shift(@_)
: ($params->{ format } || $self->{ format } || $FORMAT);
my $locale = @_ ? shift(@_)
: ($params->{ locale } || $self->{ locale });
my $gmt = @_ ? shift(@_)
: ($params->{ gmt } || $self->{ gmt });
my (@date, $datestr);
if ($time =~ /^-?\d+$/) {
# $time is now in seconds since epoch
if ($gmt) {
@date = (gmtime($time))[0..6];
}
else {
@date = (localtime($time))[0..6];
}
}
else {
# if $time is numeric, then we assume it's seconds since the epoch
# otherwise, we try to parse it as either a 'Y:M:D H:M:S' or a
# 'H:M:S D:M:Y' string
my @parts = (split(/\D/, $time));
if (@parts >= 6) {
if (length($parts[0]) == 4) {
# year is first; assume 'Y:M:D H:M:S'
@date = @parts[reverse 0..5];
}
else {
# year is last; assume 'H:M:S D:M:Y'
@date = @parts[2,1,0,3..5];
}
}
if (!@date) {
return (undef, Template::Exception->new('date',
"bad time/date string: " .
"expects 'h:m:s d:m:y' got: '$time'"));
}
$date[4] -= 1; # correct month number 1-12 to range 0-11
$date[5] -= 1900; # convert absolute year to years since 1900
$time = &POSIX::mktime(@date);
}
if ($locale) {
# format the date in a specific locale, saving and subsequently
# restoring the current locale.
my $old_locale = HAS_SETLOCALE
? &POSIX::setlocale(&POSIX::LC_ALL)
: undef;
# some systems expect locales to have a particular suffix
for my $suffix ('', @LOCALE_SUFFIX) {
my $try_locale = $locale.$suffix;
my $setlocale = HAS_SETLOCALE
? &POSIX::setlocale(&POSIX::LC_ALL, $try_locale)
: undef;
if (defined $setlocale && $try_locale eq $setlocale) {
$locale = $try_locale;
last;
}
}
$datestr = &POSIX::strftime($format, @date);
&POSIX::setlocale(&POSIX::LC_ALL, $old_locale) if HAS_SETLOCALE;
}
else {
$datestr = &POSIX::strftime($format, @date);
}
return $datestr;
}
sub calc {
my $self = shift;
eval { require "Date/Calc.pm" };
$self->throw("failed to load Date::Calc: $@") if $@;
return Template::Plugin::Date::Calc->new('no context');
}
sub manip {
my $self = shift;
eval { require "Date/Manip.pm" };
$self->throw("failed to load Date::Manip: $@") if $@;
return Template::Plugin::Date::Manip->new('no context');
}
sub throw {
my $self = shift;
die (Template::Exception->new('date', join(', ', @_)));
}
package Template::Plugin::Date::Calc;
use base qw( Template::Plugin );
use vars qw( $AUTOLOAD );
*throw = \&Template::Plugin::Date::throw;
sub AUTOLOAD {
my $self = shift;
my $method = $AUTOLOAD;
$method =~ s/.*:://;
return if $method eq 'DESTROY';
my $sub = \&{"Date::Calc::$method"};
$self->throw("no such Date::Calc method: $method")
unless $sub;
&$sub(@_);
}
package Template::Plugin::Date::Manip;
use base qw( Template::Plugin );
use vars qw( $AUTOLOAD );
*throw = \&Template::Plugin::Date::throw;
sub AUTOLOAD {
my $self = shift;
my $method = $AUTOLOAD;
$method =~ s/.*:://;
return if $method eq 'DESTROY';
my $sub = \&{"Date::Manip::$method"};
$self->throw("no such Date::Manip method: $method")
unless $sub;
&$sub(@_);
}
1;
__END__
=head1 NAME
Template::Plugin::Date - Plugin to generate formatted date strings
=head1 SYNOPSIS
[% USE date %]
# use current time and default format
[% date.format %]
# specify time as seconds since epoch
# or as a 'h:m:s d-m-y' or 'y-m-d h:m:s' string
[% date.format(960973980) %]
[% date.format('4:20:36 21/12/2000') %]
[% date.format('2000/12/21 4:20:36') %]
# specify format
[% date.format(mytime, '%H:%M:%S') %]
# specify locale
[% date.format(date.now, '%a %d %b %y', 'en_GB') %]
# named parameters
[% date.format(mytime, format = '%H:%M:%S') %]
[% date.format(locale = 'en_GB') %]
[% date.format(time = date.now,
format = '%H:%M:%S',
locale = 'en_GB) %]
# specify default format to plugin
[% USE date(format = '%H:%M:%S', locale = 'de_DE') %]
[% date.format %]
...
=head1 DESCRIPTION
The C<Date> plugin provides an easy way to generate formatted time and date
strings by delegating to the C<POSIX> C<strftime()> routine.
The plugin can be loaded via the familiar USE directive.
[% USE date %]
This creates a plugin object with the default name of 'C<date>'. An alternate
name can be specified as such:
[% USE myname = date %]
The plugin provides the C<format()> method which accepts a time value, a
format string and a locale name. All of these parameters are optional
with the current system time, default format ('C<%H:%M:%S %d-%b-%Y>') and
current locale being used respectively, if undefined. Default values
for the time, format and/or locale may be specified as named parameters
in the C<USE> directive.
[% USE date(format = '%a %d-%b-%Y', locale = 'fr_FR') %]
When called without any parameters, the C<format()> method returns a string
representing the current system time, formatted by C<strftime()> according
to the default format and for the default locale (which may not be the
current one, if locale is set in the C<USE> directive).
[% date.format %]
The plugin allows a time/date to be specified as seconds since the epoch,
as is returned by C<time()>.
File last modified: [% date.format(filemod_time) %]
The time/date can also be specified as a string of the form C<h:m:s d/m/y>
or C<y/m/d h:m:s>. Any of the characters : / - or space may be used to
delimit fields.
[% USE day = date(format => '%A', locale => 'en_GB') %]
[% day.format('4:20:00 9-13-2000') %]
Output:
Tuesday
A format string can also be passed to the C<format()> method, and a locale
specification may follow that.
[% date.format(filemod, '%d-%b-%Y') %]
[% date.format(filemod, '%d-%b-%Y', 'en_GB') %]
A fourth parameter allows you to force output in GMT, in the case of
seconds-since-the-epoch input:
[% date.format(filemod, '%d-%b-%Y', 'en_GB', 1) %]
Note that in this case, if the local time is not GMT, then also specifying
'C<%Z>' (time zone) in the format parameter will lead to an extremely
misleading result.
Any or all of these parameters may be named. Positional parameters
should always be in the order C<($time, $format, $locale)>.
[% date.format(format => '%H:%M:%S') %]
[% date.format(time => filemod, format => '%H:%M:%S') %]
[% date.format(mytime, format => '%H:%M:%S') %]
[% date.format(mytime, format => '%H:%M:%S', locale => 'fr_FR') %]
[% date.format(mytime, format => '%H:%M:%S', gmt => 1) %]
...etc...
The C<now()> method returns the current system time in seconds since the
epoch.
[% date.format(date.now, '%A') %]
The C<calc()> method can be used to create an interface to the C<Date::Calc>
module (if installed on your system).
[% calc = date.calc %]
[% calc.Monday_of_Week(22, 2001).join('/') %]
The C<manip()> method can be used to create an interface to the C<Date::Manip>
module (if installed on your system).
[% manip = date.manip %]
[% manip.UnixDate("Noon Yesterday","%Y %b %d %H:%M") %]
=head1 AUTHORS
Thierry-Michel Barral wrote the original plugin.
Andy Wardley provided some minor
fixups/enhancements, a test script and documentation.
Mark D. Mills cloned C<Date::Manip> from the C<Date::Calc> sub-plugin.
=head1 COPYRIGHT
Copyright (C) 2000-2007 Thierry-Michel Barral, Andy Wardley.
This module is free software; you can redistribute it and/or
modify it under the same terms as Perl itself.
=head1 SEE ALSO
L<Template::Plugin>, L<POSIX>
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