check for valid username, start working on download code

main.py

@@ -62,17 +62,21 @@ if "accounts" not in cfg:
 	accounts = []
 	while i != "":
 		i = input("User: ")
-		if not re.match("@(\w){1,15}$", i):
+		if not re.match("@(\w){1,16}$", i):
+			if i == "":
+				print("Accounts to learn from: {}".format(", ".join(accounts)))
+				break
 			print("Invalid username")
 			continue
 		if i == "" and len(accounts) == 0:
 			print("You must enter at least one account")
 			continue
 		print("Checking account...")
-		print(api.GetUser(screen_name=i))
-
-
-		
+		try:
+			user = api.GetUser(screen_name=i)
+			accounts.append(i)
+		except:
+			print("Invalid username.")
 
 
 # connect to database
@@ -81,11 +85,19 @@ db = sqlite3.connect("tip.db")
 db.text_factory=str
 c = db.cursor()
 
-c.execute("CREATE TABLE IF NOT EXISTS `images` (post_id INT NOT NULL UNIQUE PRIMARY KEY, user_id INT NOT NULL, image_url VARCHAR) WITHOUT ROWID")
+c.execute("CREATE TABLE IF NOT EXISTS `images` (post_id INT NOT NULL UNIQUE PRIMARY KEY, screen_name VARCHAR NOT NULL, image_url VARCHAR) WITHOUT ROWID")
 db.commit()
-last_tweet = c.execute("SELECT post_id FROM `images` WHERE user_id LIKE ? ORDER BY post_id DESC LIMIT 1", (f.id,)).fetchone()
 
-print("Downloading tweets from {}".format())
+for acct in accounts:
+	last_tweet = c.execute("SELECT post_id FROM `images` WHERE user_id LIKE ? ORDER BY post_id DESC LIMIT 1", (acct,)).fetchone()
+	if last_tweet != None:
+		last_tweet = last_tweet[0]
+	else:
+		last_tweet = 0 # start from the first one
+	print("Downloading tweets from account {}, starting from {}".format(acct, last_tweet))
+	tl = api.GetUserTimeline(screen_name = acct, since_id = last_tweet, exclude_replies = True)
+
+
 
 client = Mastodon(
 	client_id=cfg['client']['id'],