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#!/usr/bin/env perl
# Example slave command showing how to easily add additional things to the bar.
#
# You can place this in ~/.local/bin, customize it and direct wmstatus.conf
# towards by setting e.g.: command=~/.local/bin/wmstatus-weather.pl
use strict;
use warnings;
use Time::Piece;
use File::Basename;
# Retrieve current weather information from the Norwegian weather service,
# see https://api.met.no/doc/ for its documentation
my $base = 'https://api.met.no/weatherapi';
my $agent = basename($0) =~ s/[^-!#$%&'*+.^_`|~[:alnum:]]//gr;
# https://www.yr.no/storage/lookup/English.csv.zip
my $where = 'lat=50.08804&lon=14.42076&altitude=202'; # Prague
my %legends;
sub retrieve_legends {
# HTTP/Tiny supports TLS, but with non-core IO::Socket::SSL, so use cURL
open(my $sock, '-|', 'curl', '-sSA', $agent,
"$base/weathericon/2.0/legends.txt") or return $!;
while (local $_ = <$sock>) { $legends{$1} = $2 if /^(.+?),(.+?),/ }
close($sock);
}
sub weather {
# We might want to rewrite this to use the JSON API (/compact),
# see https://developer.yr.no/doc/guides/getting-started-from-forecast-xml
open(my $sock, '-|', 'curl', '-sA', $agent,
"$base/locationforecast/2.0/classic?$where") or return $!;
# Quick and dirty XML parsing is more than fine for our purpose
my ($acceptable, $temp, $symbol) = (0, undef, undef);
while (<$sock>) {
next unless m|<time| .. m|</time|;
# It gives forecast, so it doesn't necessarily contain the present;
# just process the earliest entries that aren't yet invalid
$acceptable = Time::Piece->strptime($2, '%Y-%m-%dT%H:%M:%SZ') >= gmtime
if /from="(.+?)" to="(.+?)"/;
next unless $acceptable;
# Temperature comes from a zero-length time interval, separately
$symbol = $1 if /<symbol.*? code="([^_"]+)/;
$temp = "$2 °" . uc $1 if /<temperature.*? unit="(.).+?" value="(.+?)"/;
if ($temp && $symbol) {
retrieve_legends if !%legends;
close($sock);
return "$temp (" . ($legends{$symbol} || $symbol) . ")";
}
}
close($sock);
return "No weather ($?)";
}
# Be careful not to overload the service so that they don't ban us
binmode STDOUT; $| = 1; while (1) { print weather() . "\n\n"; sleep 3600; }