Query wunderground api, for my irc bot

wunderground.go

// Copyright (c) 2013 Jordon Smith <[email protected]>

// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:

// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

// Doc: http://www.wunderground.com/weather/api/d/docs
// ToS: http://www.wunderground.com/weather/api/d/terms.html

package wunderground

import (
  "encoding/xml"
	"fmt"
	"io/ioutil"
	"net/http"
)

type Response struct {
	CurrentObservation Current `xml:"current_observation"`
	Error              struct {
		XMLName     xml.Name `xml:"error"`
		Description string   `xml:"description"`
	}
	Results []Result `xml:"results"`
}

type Result struct {
	Name string `xml:"name"`
}

// partial, check the api if you want more
type Current struct {
	Location struct {
		XMLName xml.Name `xml:"display_location"`
		Full    string   `xml:"full"`
	}
	Weather     string `xml:"weather"`
	Temperature string `xml:"temperature_string"`
	Humidity    string `xml:"relative_humidity"`
	Wind        string `xml:"wind_string"`
	FeelsLike   string `xml:"feelslike_string"`
	Visibility  string `xml:"visibility_mi"`
}

func GetCurrentWeather(location string) (string, error) {
	addr := "http://api.wunderground.com/api/<your-key>/conditions/q/" + location + ".xml"

	resp, err := http.Get(addr)
	if err != nil {
		return "", err
	}

	defer resp.Body.Close()
	body, err := ioutil.ReadAll(resp.Body)
	if err != nil {
		return "", err
	}

	var response *Response = new(Response)
	if err = xml.Unmarshal(body, response); err != nil {
		return "", err
	}

	if len(response.Error.Description) != 0 {
		return response.Error.Description, nil
	}

	if len(response.Results) > 0 {
		return "Be more specific!", nil
	}

	cw := response.CurrentObservation
	ret := fmt.Sprintf("\x02%s\x02: %s :: Temp: %s (Feels like %s) :: Humidity: %s :: Wind: %s :: Visibility (mi): %s",
		cw.Location.Full, cw.Weather, cw.Temperature, cw.FeelsLike, cw.Humidity, cw.Wind, cw.Visibility)
	return ret, nil
}