#!/usr/bin/perl
use XML::Simple;
my $xml = new XML::Simple;
my $data_new = undef;
my $data_old = undef;


&startup;
while (true) {
    if($status_new != $status_old){
        system("espeak -v de \"Das Wetter hat sich von $status_old in $status_new verändert\"");
    }
    sleep(300);
    &get_status;
}


# The startup sub is used to get the first weather state. it should only be used on startup. sorry.
sub startup(){
    system("w3m -dump \"http://www.google.com/ig/api?weather=70327-stuttgart&hl=de\" > /tmp/kachelmann/weather.xml");
    $data_new = $xml->XMLin("/tmp/kachelmann/weather.xml");
    $data_new = $data_new->{weather}->{current_conditions}->{condition}->{data};
}

# The get_status sub moves the current data to $data_old and then gets a new one from Googles API
sub get_status(){
    system("w3m -dump \"http://www.google.com/ig/api?weather=70327-stuttgart&hl=de\" > /tmp/kachelmann/weather.xml");
    $data_old = $data_new;
    $data_new = $xml->XMLin("/tmp/kachelmann/weather.xml");
    $data_new = $data_new->{weather}->{current_conditions}->{condition}->{data};
}