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package main
import (
"encoding/json"
"fmt"
"image"
_ "image/png"
_ "image/jpeg"
"io"
"math/rand"
"net/http"
"os"
"strconv"
"github.com/mattn/go-sixel"
"github.com/urfave/cli/v2"
)
const (
hostname = "https://xkcd.com"
target = "info.0.json"
)
var version string
type Comic struct {
Month string
Num int
Link string
Year string
News string
Safe_title string
Transcript string
Alt string
Img string
Title string
Day string
}
func main() {
app := &cli.App{
Name: "siXKCD",
Usage: "Sixel viewer/fetcher for XKCD Comics",
Version: version,
Authors: []*cli.Author{
{
Name: "Benjamin Chausse",
Email: "benjamin@chausse.xyz",
},
},
Flags: []cli.Flag{
&cli.StringFlag{
Name: "id",
Aliases: []string{"i"},
Usage: "Specify which comic `ID` to fetch.\nA value of 0 will fetch the latest comic (default: random)",
},
&cli.BoolFlag{
Name: "raw",
Aliases: []string{"r"},
Usage: "Output only the sixel image without the title or the alternate caption.",
},
},
Action: appAction,
}
if err := app.Run(os.Args); err != nil {
fmt.Printf("Error: %s\n", err.Error())
os.Exit(1)
}
}
func appAction(ctx *cli.Context) error {
var comic *Comic
var fetchErr error
comic, fetchErr = fetchComic("latest")
if fetchErr != nil {
return fetchErr
}
switch ctx.String("id") {
case "0":
// Latest is already fetched
break
case "":
// Random
rand := rand.Intn(comic.Num+1)
comic, fetchErr = fetchComic(strconv.Itoa(rand))
default:
comic, fetchErr = fetchComic(ctx.String("id"))
}
if fetchErr != nil {
return fetchErr
}
img, err := fetchImg(comic.Img)
if err != nil {
return err
}
isRaw := ctx.Bool("raw")
if !isRaw {
fmt.Println("Title: ", comic.Title)
}
if err := sixel.NewEncoder(os.Stdout).Encode(img); err != nil {
return err
}
if !isRaw && comic.Alt != "" {
fmt.Println(comic.Alt)
}
return nil
}
func fetchComic(id string) (*Comic, error){
comicUrl := hostname+"/"+id+"/"+target
if id == "latest" {
comicUrl = hostname+"/"+target
}
res, err := http.Get(comicUrl)
if err != nil {
return nil, err
}
defer res.Body.Close()
if res.StatusCode != http.StatusOK {
return nil, fmt.Errorf("GET %s status code: %d", comicUrl, res.StatusCode)
}
content, err := io.ReadAll(res.Body)
if err != nil {
return nil, err
}
comic := Comic{}
if err := json.Unmarshal(content, &comic); err != nil {
return nil, err
}
return &comic, nil
}
func fetchImg(url string) (image.Image, error) {
res, err := http.Get(url)
if err != nil {
return nil, err
}
defer res.Body.Close()
img, _, err := image.Decode(res.Body)
if err != nil {
return nil, err
}
return img, nil
}
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