Allow users to define custom reddit thread from .env or generate random one as usual

.env.template

@@ -11,5 +11,8 @@ THEME=""
 # Enter a subreddit, e.g. "AskReddit"
 SUBREDDIT=""
 
+# Enter a reddit thread URL, leave it blank to load a random one from the Subreddit
+REDDITTHREAD=""
+
 # Range is 0 -> 1
 OPACITY="0.9"

reddit/subreddit.py

@@ -45,9 +45,14 @@ def get_subreddit_threads():
             subreddit = reddit.subreddit("askreddit")
             print_substep("Subreddit not defined. Using AskReddit.")
 
+    if os.getenv("REDDITTHREAD"):
+        submission = reddit.submission(url=os.getenv("REDDITTHREAD"))
+    else:
         threads = subreddit.hot(limit=25)
         submission = list(threads)[random.randrange(0, 25)]
+        
     print_substep(f"Video will be: {submission.title} :thumbsup:")
+    
     try:
 
         content["thread_url"] = submission.url