シャニの4コマ漫画をランダムで端末に出力するサンプル (sixel)

main.go

package main

import (
	"encoding/json"
	"fmt"
	"image"
	"image/jpeg"
	"log"
	"math/rand"
	"net/http"
	"os"
	"time"

	"github.com/mattn/go-sixel"
)

type yonkomaResponse struct {
	Category     string   `json:"category"`
	Title        string   `json:"title"`
	Number       int      `json:"number"`
	Idols        []string `json:"idols"`
	Url          string   `json:"url"`
	PhotoURL     string   `json:"photoUrl"`
	PublishedUTC string   `json:"publishedUtc"`
}

func main() {
	raw, err := fetchYonkomaData()
	if err != nil {
		log.Fatalln(err)
	}

	rand.Seed(time.Now().UnixNano())
	url := raw[rand.Intn(len(raw))].PhotoURL
	fmt.Println(url)

	img, err := fetchImage(url)
	if err != nil {
		log.Fatalln(err)
	}

	if err := sixel.NewEncoder(os.Stdout).Encode(img); err != nil {
		log.Fatalln(err)
	}
}

func fetchYonkomaData() ([]yonkomaResponse, error) {
	res, err := http.Get("https://arrow2nd.github.io/shiny-yonkoma/yonkoma.json")
	if err != nil {
		return nil, err
	}

	defer res.Body.Close()
	decorder := json.NewDecoder(res.Body)

	raw := []yonkomaResponse{}
	if err := decorder.Decode(&raw); err != nil {
		return nil, err
	}

	return raw, nil
}

func fetchImage(url string) (image.Image, error) {
	res, err := http.Get(url)
	if err != nil {
		log.Fatalln(err)
	}

	defer res.Body.Close()
	return jpeg.Decode(res.Body)
}