add Twitch mime parser

tuir/mime_parsers.py

@@ -320,6 +320,16 @@ class StreamableMIMEParser(OpenGraphMIMEParser):
     """
     pattern = re.compile(r'https?://(www\.)?streamable\.com/[^.]+$')
 
+class TwitchMIMEParser(BaseMIMEParser):
+    """
+    Twitch videos can be streamed with vlc or downloaded with youtube-dl.
+    Assign a custom mime-type so they can be referenced in mailcap.
+    """
+    pattern = re.compile(r'https?://(clips|go|m|player|www)\.?twitch\.tv/[^.]+$')
+
+    @staticmethod
+    def get_mimetype(url):
+        return url, 'video/x-youtube'
 
 class LiveleakMIMEParser(BaseMIMEParser):
     """
@@ -479,6 +489,7 @@ parsers = [
     GiphyMIMEParser,
     ImgflipMIMEParser,
     LivememeMIMEParser,
+    TwitchMIMEParser,
     MakeamemeMIMEParser,
     WorldStarHipHopMIMEParser,
     GifvMIMEParser,