Add support to treat URL's passed in lists as URL's by ytmdl

The URL's passed in a list were earlier treat as a song. Added some
changes to detect if the passed entry is a Youtube URL and accordingly
treat it as one.

Should fix #205

Author: deepjyoti30

bin/ytmdl

@@ -39,6 +39,7 @@ from ytmdl.utils.archive import (
     is_present_in_archive,
     add_song_to_archive
 )
+from ytmdl.yt import is_yt_url
 from ytmdl.__version__ import __version__
 
 # init colorama for windows
@@ -514,7 +515,15 @@ def extract_data():
             logger.info("Downloading songs in {}".format(args.list))
             for song_name in songs:
                 logger.debug(song_name)
-                args.SONG_NAME = [song_name]
+
+                # Set the song name if an URL is not passed, else
+                # pass it as an URL
+                if is_yt_url(song_name):
+                    logger.debug("Detected passed song as URL")
+                    args.url = song_name
+                else:
+                    args.SONG_NAME = [song_name]
+
                 main(args)
         else:
             logger.info("{}: is empty".format(args.list))

ytmdl/yt.py

@@ -257,6 +257,14 @@ def is_playlist(url):
     return match(playlist_part, url)
 
 
+def is_yt_url(url):
+    """
+    Check if the passed URL is a valid youtube URL.
+    """
+    yt_url = r"https?://(www\.|music\.)?youtube\.com/watch\?v=.*?$"
+    return match(yt_url, url)
+
+
 def get_playlist(
     url,
     proxy,