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package main
// TODO: allow free-text lookups of place names, rather than ids
// TODO: decode weather type number
// TODO: split out met office specific stuff to separate module
// TODO: add other weather providers
import (
"encoding/json"
"flag"
"fmt"
"io/ioutil"
"log"
"net/http"
)
const defid = "310118"
type Response struct {
BestFcst struct {
Forecast struct {
Location struct {
Days []Day `json:"Day"`
}
}
}
}
type Day struct {
Date string `json:"@date"`
DayValues struct {
WeatherParameters WeatherParams
}
NightValues struct {
WeatherParameters WeatherParams
}
TimeSteps struct {
TimeStep []struct {
Time string `json:"@time"`
WeatherParameters WeatherParams
}
}
}
type WeatherParams struct {
AQIndex int // Air Quality
F float64 // Feels Like Temperature
H int // Humidity
P int // Pressure
PP int // Precipitation Probability
T float64 // Temperature
UV int // Max UV Index
V int // Visibility
WD string // Wind Direction
WG float64 // Wind Gust
WS float64 // Wind Speed
WT int // Weather Type
}
var (
numdays = flag.Int("n", 2, "number of days to show")
verbose = flag.Bool("v", false, "verbose: show all weather details")
)
func main() {
var r Response
var id string
flag.Parse()
if flag.NArg() > 0 {
id = flag.Arg(0)
} else {
id = defid
}
resp, err := http.Get("https://www.metoffice.gov.uk/public/data/PWSCache/BestForecast/Forecast/" + id + ".json?concise=true")
if err != nil {
log.Fatal(err)
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
log.Fatalf("HTTP status code: %d\n", resp.StatusCode)
}
b, err := ioutil.ReadAll(resp.Body)
err = json.Unmarshal(b, &r)
if err != nil {
log.Fatal(err)
}
for i, d := range r.BestFcst.Forecast.Location.Days {
if *numdays > 0 && i >= *numdays {
break
}
if i > 0 {
fmt.Printf("---------------------------------------------------------\n")
}
fmt.Printf("%s\n", d.Date)
prettyWeather(" Day", d.DayValues.WeatherParameters)
prettyWeather(" Night", d.NightValues.WeatherParameters)
for _, t := range d.TimeSteps.TimeStep {
prettyWeather(t.Time, t.WeatherParameters)
}
}
}
func prettyWeather(t string, w WeatherParams) {
fmt.Printf("%s Type: %2d, Temp: %4.1f°C, Rain: %2d%%, Wind: %2.1fm/s\n", t, w.WT, w.T, w.PP, w.WS)
if *verbose {
fmt.Printf(" %+v\n", w)
}
}
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