Merge pull request #103 from jdepoix/bugfix/ISSUE-80

adjusted CLI to be able to handle masked hyphens

README.md

@@ -197,6 +197,12 @@ If you are not sure which languages are available for a given video you can call
 youtube_transcript_api --list-transcripts <first_video_id>
 ```
 
+If a video's ID starts with a hyphen you'll have to mask the hyphen using `\` to prevent the CLI from mistaking it for a argument name. For example to get the transcript for the video with the ID `-abc123` run:
+
+```
+youtube_transcript_api "\-abc123"
+```
+
 ## Proxy  
 
 You can specify a https/http proxy, which will be used during the requests to YouTube:  

youtube_transcript_api/_cli.py

@@ -131,4 +131,8 @@ class YouTubeTranscriptCli(object):
             help='The cookie file that will be used for authorization with youtube.'
         )
             
-        return parser.parse_args(self._args)
+        return self._sanitize_video_ids(parser.parse_args(self._args))
+
+    def _sanitize_video_ids(self, args):
+        args.video_ids = [video_id.replace('\\', '') for video_id in args.video_ids]
+        return args

youtube_transcript_api/test/test_cli.py

@@ -79,6 +79,12 @@ class TestYouTubeTranscriptCli(TestCase):
         self.assertEqual(parsed_args.json, False)
         self.assertEqual(parsed_args.languages, ['en'])
 
+    def test_argument_parsing__video_ids_starting_with_dash(self):
+        parsed_args = YouTubeTranscriptCli('\-v1 \-\-v2 \--v3'.split())._parse_args()
+        self.assertEqual(parsed_args.video_ids, ['-v1', '--v2', '--v3'])
+        self.assertEqual(parsed_args.json, False)
+        self.assertEqual(parsed_args.languages, ['en'])
+
     def test_argument_parsing__fail_without_video_ids(self):
         with self.assertRaises(SystemExit):
             YouTubeTranscriptCli('--json'.split())._parse_args()