Add soundcloud autoresponse plugin.

Currently supports tracks/playlists and users. The /resolve endpoint doesn't send any kind of information about what the item is, except missing items in the response (like .title, which is only in track and playlist responses). So I catch the AttributeError there and switch to returning username instead.

plugins/soundc.py

@@ -0,0 +1,18 @@
+from util import hook, http, web
+import soundcloud
+import re
+
+sc_re = (r'(.*:)//(www.)?(soundcloud.com)(.*)', re.I)
+
+@hook.regex(*sc_re)
+def soundcloud_url(match, bot=None):
+  api_key = bot.config.get("api_keys", {}).get("soundcloud")
+  if not api_key:
+    return "Error: no api key set"
+  url = match.group(1).split(' ')[-1] + "//" + (match.group(2) if match.group(2) else "") + match.group(3) + match.group(4).split(' ')[0]
+  client = soundcloud.Client(client_id=api_key)
+  track = client.get('/resolve', url=url)
+  try:
+    return "SoundCloud track: \x02%s\x02 by \x02%s\x02 - \x02%s\x02" % (track.title, track.user['username'], web.isgd(track.permalink_url))
+  except:
+    return "SoundCloud user: \x02%s\x02 - \x02%s\x02" % (track.username, web.isgd(track.permalink_url))