Format mentions and urls in tweets

bot.py

@@ -3,6 +3,7 @@
 import asyncio
 import configparser
 import datetime
+import html
 import json
 import logging
 import os
@@ -93,12 +94,27 @@ class Bot(discord.Client):
         return tweepy.API(handler)
 
     def make_twitter_embed(self, tweet):
+        def format_description(tweet_url):
+            text = tweet.get('text')
+            replacements = []
+            for mention in tweet.get('entities', {}).get('user_mentions', []):
+                indices = mention.get('indices')
+                if indices:
+                    replacements.append((indices, '[{0}]({1}{2})'.format(text[slice(*indices)],
+                        TWITTER_USER_URL, mention.get('id_str'))))
+            for url in tweet.get('entities', {}).get('urls', []):
+                indices = url.get('indices')
+                if indices:
+                    replacements.append((indices, '[{0}]({1})'.format(url.get('display_url',
+                        text[slice(*indices)]), url.get('expanded_url'))))
+            for indices, replacement in sorted(replacements, key=lambda x: x[0][0], reverse=True):
+                text = text[:indices[0]] + replacement + text[indices[1]:]
+            return '{0}\n[{1}]({1})'.format(html.unescape(text), tweet_url)
         tweet_url = '{0}{1}'.format(TWITTER_STATUS_URL, tweet.get('id_str'))
         author_url = '{0}{1}'.format(TWITTER_USER_URL, tweet.get('user', {}).get('id_str'))
         author_handle = '@{0}'.format(tweet.get('user', {}).get('screen_name'))
-        description = '{0}\n[{1}]({1})'.format(tweet.get('text'), tweet_url)
         embed = discord.Embed(
-            description=description,
+            description=format_description(tweet_url),
             url=tweet_url,
             color=TWITTER_COLOR
         )