xkcdDownloader.go

package main

import (
    "encoding/json"
    "flag"
    "fmt"
    "io"
    "io/ioutil"
    "log"
    "net/http"
    "os"
)

// Marshalling
type XKCD struct {
    Month      string
    Num        int
    Link       string
    Year       string
    News       string
    SafeTitle  string `json:"safe_title"`
    Transcript string
    Alt        string
    Img        string
    Title      string
    Day        string
}

func main() {

    // Flags
    xkcdURL := flag.String("xkcd", "https://xkcd.com/info.0.json", "Link to XKCD data that you want")
    downloadImage := flag.Bool("download", false, "True if you want to download the image else False")

    flag.Parse()

    // Request Endpoint
    resp, err := http.Get(*xkcdURL)

    // Log if it dies
    if err != nil {
        log.Fatal(err)
    }

    // No idea
    defer resp.Body.Close()

    // Get the JSON data
    respBody, err := ioutil.ReadAll(resp.Body)

    if err != nil {
        log.Fatal(err)
    }

    xkcd := XKCD{}

    // Map JSON to the struct
    json.Unmarshal(respBody, &xkcd)

    // If the user wants to download the image
    if *downloadImage {

        // Request the actual image
        resp, err := http.Get(xkcd.Img)

        if err != nil {
            log.Fatal(err)
        } else {
            // Create file to store image
            file, err := os.Create("./download.png")

            defer file.Close()

            if err != nil {
                log.Fatal(err)
            }

            // Write image data
            _, err = io.Copy(file, resp.Body)

            fmt.Println("Downloaded file")
        }
    }
}