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#!/usr/bin/env perl
use strict;
use warnings;
use 5.010;
use Astro::Sunrise;
use DateTime;
use DateTime::Duration;
use Getopt::Std;
our $VERSION = '0.0';
sub show_usage {
my ($exit_status) = @_;
say
"Usage: $0 [-d <offset>] [-t <twilight altitude>] [-ov] <latitude> <longitude>";
exit( $exit_status // 0 );
}
sub get_rise_and_set {
my ( $ts, $lon, $lat, $alt ) = @_;
my ( $rise_str, $set_str )
= sunrise( $ts->year, $ts->month, $ts->day, $lon, $lat,
$ts->offset / 3600,
0, $alt );
my ( $rise_h, $rise_m ) = ( $rise_str =~ m{(..):(..)} );
my ( $set_h, $set_m ) = ( $set_str =~ m{(..):(..)} );
my $rise = $ts->clone->set(
hour => $rise_h,
minute => $rise_m,
second => 0,
);
my $set = $ts->clone->set(
hour => $set_h,
minute => $set_m,
second => 0,
);
return ( $rise, $set );
}
my %opts;
getopts( 'd:hot:v', \%opts );
if ( $opts{h} ) {
show_usage(0);
}
if ( @ARGV != 2 ) {
show_usage(1);
}
my ( $latitude, $longitude ) = @ARGV;
if ( $opts{d} and not $opts{d} =~ m{ ^ -? [[:digit:]]+ $}x ) {
say STDERR "Error: Offset (-d ...) must be a number\n";
show_usage(1);
}
my $now = DateTime->now( time_zone => 'local' );
my $delta = DateTime::Duration->new( minutes => $opts{d} || 0 );
my $altitude = $opts{t} // Astro::Sunrise::DEFAULT;
my ( $sunrise, $sunset )
= get_rise_and_set( $now, $longitude, $latitude, $altitude );
$sunrise->add_duration($delta);
$sunset->subtract_duration($delta);
if ( $opts{v} ) {
say 'rise at ' . $sunrise->strftime('%H:%M');
say 'now is ' . $now->strftime('%H:%M');
say 'set at ' . $sunset->strftime('%H:%M');
}
if ( $opts{o} ) {
say( ( $now < $sunrise or $now > $sunset ) ? '1' : '0' );
exit 0;
}
if ( $now < $sunrise or $now > $sunset ) {
exit 0;
}
exit 1;
__END__
=head1 NAME
=head1 SYNOPSIS
=head1 VERSION
=head1 DESCRIPTION
=head1 OPTIONS
=over
=back
=head1 EXIT STATUS
=head1 CONFIGURATION
None.
=head1 DEPENDENCIES
=over
=back
=head1 BUGS AND LIMITATIONS
=head1 AUTHOR
Copyright (C) 2012 by Daniel Friesel E<lt>derf@finalrewind.orgE<gt>
=head1 LICENSE
0. You just DO WHAT THE FUCK YOU WANT TO.
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