trend.go

package main

import (
	"context"
	"encoding/json"
	"fmt"
	"log"
	"strings"

	"golang.org/x/oauth2/clientcredentials"
)

// {Country:Japan CountryCode:JP Name:Kitakyushu PlaceType:{Code:7 Name:Town} WOEID:1110809}
// {Country:Japan CountryCode:JP Name:Saitama PlaceType:{Code:7 Name:Town} WOEID:1116753}
// {Country:Japan CountryCode:JP Name:Chiba PlaceType:{Code:7 Name:Town} WOEID:1117034}
// {Country:Japan CountryCode:JP Name:Fukuoka PlaceType:{Code:7 Name:Town} WOEID:1117099}
// {Country:Japan CountryCode:JP Name:Hamamatsu PlaceType:{Code:7 Name:Town} WOEID:1117155}
// {Country:Japan CountryCode:JP Name:Hiroshima PlaceType:{Code:7 Name:Town} WOEID:1117227}
// {Country:Japan CountryCode:JP Name:Kawasaki PlaceType:{Code:7 Name:Town} WOEID:1117502}
// {Country:Japan CountryCode:JP Name:Kobe PlaceType:{Code:7 Name:Town} WOEID:1117545}
// {Country:Japan CountryCode:JP Name:Kumamoto PlaceType:{Code:7 Name:Town} WOEID:1117605}
// {Country:Japan CountryCode:JP Name:Nagoya PlaceType:{Code:7 Name:Town} WOEID:1117817}
// {Country:Japan CountryCode:JP Name:Niigata PlaceType:{Code:7 Name:Town} WOEID:1117881}
// {Country:Japan CountryCode:JP Name:Sagamihara PlaceType:{Code:7 Name:Town} WOEID:1118072}
// {Country:Japan CountryCode:JP Name:Sapporo PlaceType:{Code:7 Name:Town} WOEID:1118108}
// {Country:Japan CountryCode:JP Name:Sendai PlaceType:{Code:7 Name:Town} WOEID:1118129}
// {Country:Japan CountryCode:JP Name:Takamatsu PlaceType:{Code:7 Name:Town} WOEID:1118285}
// {Country:Japan CountryCode:JP Name:Tokyo PlaceType:{Code:7 Name:Town} WOEID:1118370}
// {Country:Japan CountryCode:JP Name:Yokohama PlaceType:{Code:7 Name:Town} WOEID:1118550}
// {Country:Japan CountryCode:JP Name:Okinawa PlaceType:{Code:7 Name:Town} WOEID:2345896}
// {Country:Japan CountryCode:JP Name:Osaka PlaceType:{Code:7 Name:Town} WOEID:15015370}
// {Country:Japan CountryCode:JP Name:Kyoto PlaceType:{Code:7 Name:Town} WOEID:15015372}
// {Country:Japan CountryCode:JP Name:Japan PlaceType:{Code:12 Name:Country} WOEID:23424856}
// {Country:Japan CountryCode:JP Name:Okayama PlaceType:{Code:7 Name:Town} WOEID:90036018}

func main() {
	config := &clientcredentials.Config{
		ClientID:     "*************************",
		ClientSecret: "**************************************************",
		TokenURL:     "https://api.twitter.com/oauth2/token",
	}
	client := config.Client(context.Background())

	res, err := client.Get("https://api.twitter.com/1.1/trends/place.json?id=23424856")
	if err != nil {
		log.Fatal(err)
	}
	defer res.Body.Close()

	type trend struct {
		Name        string `json:"name"`
		TweetVolume int    `json:"tweet_volume"`
	}
	var response []struct {
		Trends []trend `json:"trends"`
	}
	if err := json.NewDecoder(res.Body).Decode(&response); err != nil {
		log.Fatal(err)
	}

	words := []string{}
	for _, t := range response[0].Trends {
		if t.TweetVolume > 0 {
			words = append(words, fmt.Sprintf("「%s」(%d件)", t.Name, t.TweetVolume))
		}
	}
	fmt.Printf("現在のトレンドは %s です\n", strings.Join(words, "、"))
}