Add bing and unsplash to wallpaper script

bin/.bin/get_unsplash_potd.py

@@ -0,0 +1,24 @@
+#!/usr/bin/env python3
+import os
+import subprocess
+from datetime import datetime
+
+import requests
+
+today = datetime.today().strftime("%Y-%m-%d")
+home = os.path.expanduser("~")
+target_path = f"{home}/var/backgrounds/unsplash/{today}.jpg"
+
+# If the file for today already exists, just exit
+if os.path.isfile(target_path):
+    print(f"Unsplash image for {today} already exists, skipping download")
+    exit()
+
+root = "https://source.unsplash.com"
+iotd_uri = f"{root}/random/daily"
+img = requests.get(iotd_uri, stream=True)
+
+handle = open(target_path, "wb")
+for chunk in img.iter_content(chunk_size=512):
+    if chunk:  # filter out keep-alive new chunks
+        handle.write(chunk)