Downloads NASA Astronomy Picture of the Day and displays it as the background using feh

apod.ts

#!/usr/bin/env -S deno run --allow-net=api.nasa.gov,apod.nasa.gov --allow-env --allow-write=${HOME}/.apodwallpaper --allow-run

// Filename: apod.ts
// Purposes: Downloads NASA Astronomy Picture of the Day and displays it as the background using feh
// Author(s): Nikolay "Lierdakil" Yakimov https://github.com/lierdakil

// !!! Replace this with your NASA API key; go to https://api.nasa.gov/ to get one
const api_key = 'DEMO_KEY'

// Read home variable
const home = Deno.env.get('HOME')
if(home == undefined) {
  throw new Error('$HOME undefined')
}

// Create directory
const apod_dir = `${home}/.apodwallpaper`
try {
  await Deno.mkdir(apod_dir)
} catch (e) {
  if (e.name !== 'AlreadyExists') {
    throw e
  }
}

// Get random record
const response = await fetch(`https://api.nasa.gov/planetary/apod?api_key=${api_key}&count=1`)
const result = await response.json()

// Get image url
const hdurl = result[0].hdurl

// Fetch image
const response_img = await fetch(hdurl)
const result_img = await response_img.blob()

const ext = hdurl.match(/\.([^.]*)$/)[1]
const apod_file = `${home}/.apodwallpaper/apod.${ext}`

// Save image
await Deno.writeFile(apod_file, new Deno.Buffer(await result_img.arrayBuffer()).bytes())

// Run feh
const proc = Deno.run({
  cmd: ['feh', '--no-xinerama', '--bg-fill', apod_file],
  stderr: 'inherit',
  stdout: 'inherit',
})

await proc.status()