main: Remove support for --gst-* and --help-gst

Use GStreamer's environment variables instead, e.g. GST_DEBUG=3.

mopidy/__main__.py

@@ -16,18 +16,10 @@ import pkg_resources
 import pykka.debug
 
 
-# Extract any non-GStreamer arguments, and leave the GStreamer arguments for
-# processing by GStreamer. This needs to be done before GStreamer is imported,
-# so that GStreamer doesn't hijack e.g. ``--help``.
-# NOTE This naive fix does not support values like ``bar`` in
-# ``--gst-foo bar``. Use equals to pass values, like ``--gst-foo=bar``.
-
-def is_gst_arg(argument):
-    return argument.startswith('--gst') or argument == '--help-gst'
-
-gstreamer_args = [arg for arg in sys.argv[1:] if is_gst_arg(arg)]
-mopidy_args = [arg for arg in sys.argv[1:] if not is_gst_arg(arg)]
-sys.argv[1:] = gstreamer_args
+# Extract any command line arguments. This needs to be done before GStreamer is
+# imported, so that GStreamer doesn't hijack e.g. ``--help``.
+mopidy_args = sys.argv[1:]
+sys.argv[1:] = []
 
 
 from mopidy import exceptions, settings
@@ -101,10 +93,6 @@ def parse_options():
 
     # NOTE First argument to add_option must be bytestrings on Python < 2.6.2
     # See https://github.com/mopidy/mopidy/issues/302 for details
-    parser.add_option(
-        b'--help-gst',
-        action='store_true', dest='help_gst',
-        help='show GStreamer help options')
     parser.add_option(
         b'-i', '--interactive',
         action='store_true', dest='interactive',

tests/help_test.py

@@ -17,7 +17,6 @@ class HelpTest(unittest.TestCase):
         output = process.communicate()[0]
         self.assertIn('--version', output)
         self.assertIn('--help', output)
-        self.assertIn('--help-gst', output)
         self.assertIn('--interactive', output)
         self.assertIn('--quiet', output)
         self.assertIn('--verbose', output)
@@ -25,10 +24,3 @@ class HelpTest(unittest.TestCase):
         self.assertIn('--show-config', output)
         self.assertIn('--config', output)
         self.assertIn('--option', output)
-
-    def test_help_gst_has_gstreamer_options(self):
-        mopidy_dir = os.path.dirname(mopidy.__file__)
-        args = [sys.executable, mopidy_dir, '--help-gst']
-        process = subprocess.Popen(args, stdout=subprocess.PIPE)
-        output = process.communicate()[0]
-        self.assertIn('--gst-version', output)