Fix count bugs (#1)

* tail/head working
* check if votes is null.

rfd/rfd_cli.py

@@ -28,9 +28,10 @@ def cli():
 
 
 @cli.command(short_help="Displays posts in a specific thread.")
-@click.option('--count', default=5, help='Number of topics. 0 for all topics')
+@click.option('--head', default=0, help='Number of topics. Default is 0, for all topics')
+@click.option('--tail', default=0, help='Number of topics. Default is disabled. This will override head.')
 @click.argument('post_id')
-def posts(count, post_id):
+def posts(post_id, head, tail):
     """Displays posts in a specific thread.
 
     post_id can be a full url or post id only
@@ -41,13 +42,23 @@ def posts(count, post_id):
     url: https://forums.redflagdeals.com/koodo-targeted-public-mobile-12-120-koodo-5gb-40-no-referrals-2173603
     post_id: 2173603
     """
-    if count < 0:
-        click.echo("Invalid count.")
+    if head < 0:
+        click.echo("Invalid head.")
         sys.exit(1)
 
+    if tail < 0:
+        click.echo("Invalid tail.")
+        sys.exit(1)
+
+    # Tail overrides head
+    if tail > 0:
+        count = tail
+    else:
+        count = head
+
     try:
         click.echo("-" * get_terminal_width())
-        for post in get_posts(post_id, count):
+        for post in get_posts(post=post_id, count=count, tail=tail > 0):
             click.echo(" -" + get_vote_color(post.get('score')) + Fore.RESET +
                        post.get('body') + Fore.YELLOW + " ({})".format(post.get('user')))
             click.echo(Style.RESET_ALL)