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// Copyright (c) 2020, Andinus <andinus@inventati.org>
// Permission to use, copy, modify, and/or distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice appear in all copies.
// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
package main
import (
"encoding/json"
"flag"
"fmt"
"io/ioutil"
"log"
"net/http"
"os/exec"
"time"
)
var (
err error
timeout time.Duration
)
func main() {
var (
imgPath string
apod bool
apodAPI string
apodAPIKey string
)
// Parse flags passed to program
flag.StringVar(&imgPath, "img-path", "", "Image to set as wallpaper")
flag.BoolVar(&apod, "apod", false, "Set Astronomy Picture of the Day as wallpaper")
flag.StringVar(&apodAPI, "apod-api", "https://api.nasa.gov/planetary/apod", "APOD API URL")
flag.StringVar(&apodAPIKey, "apod-api-key", "DEMO_KEY", "APOD API Key")
flag.DurationVar(&timeout, "timeout", 16, "Timeout for http client")
flag.Parse()
if len(imgPath) > 0 {
err = setWall(imgPath)
errChk(err)
return
}
if apod != false {
apodI := make(map[string]string)
apodI["api"] = apodAPI
apodI["apiKey"] = apodAPIKey
err = setWallFromAPOD(apodI)
errChk(err)
return
}
}
// Calls feh to set the wallpaper
func setWall(imgPath string) error {
feh, err := exec.LookPath("feh")
if err != nil {
fmt.Println("Error: feh is not in $PATH")
return err
}
fmt.Printf("Path to set as Wallpaper: %s\n", imgPath)
err = exec.Command(feh, "--bg-fill", imgPath).Run()
return err
}
// Get url of Astronomy Picture of the Day & pass it to setWall()
func setWallFromAPOD(apodI map[string]string) error {
type apodRes struct {
Copyright string `json:"copyright"`
Date string `json:"string"`
Explanation string `json:"explanation"`
HDURL string `json:"hdurl"`
MediaType string `json:"media_type"`
ServiceVersion string `json:"service_version"`
Title string `json:"title"`
URL string `json:"url"`
}
apodNow := apodRes{}
req, err := http.NewRequest(http.MethodGet, apodI["api"], nil)
if err != nil {
return err
}
q := req.URL.Query()
q.Add("api_key", apodI["apiKey"])
req.URL.RawQuery = q.Encode()
res, err := getRes(req)
if err != nil {
fmt.Printf("Error: GET %s\n", apodI["api"])
return err
}
defer res.Body.Close()
apiBody, err := ioutil.ReadAll(res.Body)
if err != nil {
return err
}
err = json.Unmarshal([]byte(apiBody), &apodNow)
if err != nil {
return err
}
// Set Astronomy Picture of the Day as wallpaper
err = setWall(apodNow.HDURL)
return err
}
func getRes(req *http.Request) (*http.Response, error) {
client := http.Client{
Timeout: time.Second * timeout,
}
res, err := client.Do(req)
return res, err
}
func errChk(err error) {
if err != nil {
log.Fatal(err)
}
}
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