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#!/usr/bin/env perl
use strict;
use warnings;
use POSIX qw/strftime/;
my $click = $ENV{BLOCK_BUTTON} || 0;
my $format = $ENV{BLOCK_INSTANCE} || $ENV{STRFTIME_FORMAT} || "%H:%M";
my $tz_file = shift || $ENV{TZ_FILE} || "$ENV{HOME}/.tz";
$tz_file = glob($tz_file);
my $default_tz = get_default_tz();
my $tzones = $ENV{TZONES} || '$DEFAULT_TZ';
$tzones =~ s/\$DEFAULT_TZ/$default_tz/g;
my @tz_list = split(/,/, $tzones);
my @tz_labels = split(/,/, $ENV{TZ_LABELS} || "");
if (scalar(@tz_list) != scalar(@tz_labels)) {
@tz_labels = @tz_list;
}
my $current_tz;
if ($click == 1) {
$current_tz = get_tz();
my %tzmap;
$tzmap{""} = $tz_list[0];
my $prev = $tz_list[0];
foreach my $tz (@tz_list) {
$tzmap{$prev} = $tz;
$prev = $tz;
}
$tzmap{$prev} = $tz_list[0];
if (exists $tzmap{$current_tz}) {
set_tz($tzmap{$current_tz});
$current_tz = $tzmap{$current_tz};
}
}
# How each timezone will be displayed in the bar.
my %display_map;
for (my $i=0; $i < scalar(@tz_list); $i++) {
$display_map{$tz_list[$i]} = $tz_labels[$i];
}
if (!defined $current_tz) {
$current_tz = get_tz();
set_tz($current_tz);
}
$ENV{TZ} = $current_tz;
my $tz_display = "";
if (!exists $display_map{$ENV{TZ}}) {
$ENV{TZ} = $tz_list[0];
set_tz($tz_list[0]);
}
$tz_display = $display_map{$ENV{TZ}};
my $time = strftime($format, localtime());
if ($tz_display eq "") {
print "$time\n";
} else {
print "$time ($tz_display)\n";
}
sub get_tz {
my $current_tz;
if (-f $tz_file) {
open my $fh, '<', $tz_file || die "Couldn't open file: $tz_file";
$current_tz = <$fh>;
chomp $current_tz;
close $fh;
}
return $current_tz || get_default_tz();
}
sub set_tz {
my $tz = shift;
open my $fh, '>', $tz_file || die "Couldn't open file: $tz_file";
print $fh $tz;
close $fh;
}
sub get_default_tz {
my $tz = "Europe/London";
if (-f "/etc/timezone") {
open my $fh, '<', "/etc/timezone" || die "Couldn't open file: /etc/timezone";
$tz = <$fh>;
chomp $tz;
close $fh;
} elsif (-l "/etc/localtime") {
$tz = readlink "/etc/localtime";
$tz = (split /zoneinfo\//, $tz)[-1];
}
return $tz;
}
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