package main import ( "encoding/xml" "fmt" "net/http" "time" ) func toTime(s string) time.Time { t, _ := time.Parse("2006-01-02T15:04:05", s) return t } type Weather struct { Temp Temperature `xml:"temperature"` Symbol struct { Number int `xml:"number,attr"` } `xml:"symbol"` From string `xml:"from,attr"` URL string Icon string } func (w *Weather) prepIcon(sun Sun) { rise := toTime(sun.Rise) set := toTime(sun.Set) t := toTime(w.From) night := t.Before(rise) || t.After(set) format := "http://symbol.yr.no/grafikk/sym/b100/%02d" switch w.Symbol.Number { case 1, 2, 3, 5, 6, 7, 8, 20, 21: if night { format += "n.50" } else { format += "d" } } format += ".png" w.Icon = fmt.Sprintf(format, w.Symbol.Number) } type Temperature struct { Value int `xml:"value,attr"` Unit string `xml:"unit,attr"` } type Sun struct { Rise string `xml:"rise,attr"` Set string `xml:"set,attr"` } type weatherdata struct { Sun Sun `xml:"sun"` Forecast []*Weather `xml:"forecast>tabular>time"` } const place = "Germany/Schleswig-Holstein/Lübeck" func CurrentWeather() (Weather, Sun, error) { url := "http://www.yr.no/place/" + place + "/forecast_hour_by_hour.xml" resp, err := http.Get(url) if err != nil { return Weather{}, Sun{}, err } defer resp.Body.Close() var wd weatherdata dec := xml.NewDecoder(resp.Body) if err := dec.Decode(&wd); err != nil { return Weather{}, Sun{}, err } w := wd.Forecast[0] w.URL = "http://www.yr.no/place/" + place w.prepIcon(wd.Sun) return *w, wd.Sun, nil }