Add '--list-settings' option

docs/changes.rst

@@ -33,6 +33,8 @@ greatly improved MPD client support.
 - Exit early if not Python >= 2.6, < 3.
 - Validate settings at startup and print useful error messages if the settings
   has not been updated or anything is misspelled.
+- Add command line option :option:`--list-settings` to print the currently
+  active settings.
 - Include Sphinx scripts for building docs, pylintrc, tests and test data in
   the packages created by ``setup.py`` for i.e. PyPI.
 - MPD frontend:
@@ -207,8 +209,8 @@ the established pace of at least a release per month.
 
 - Improvements to MPD protocol handling, making Mopidy work much better with a
   group of clients, including ncmpc, MPoD, and Theremin.
-- New command line flag ``--dump`` for dumping debug log to ``dump.log`` in the
-  current directory.
+- New command line flag :option:`--dump` for dumping debug log to ``dump.log``
+  in the current directory.
 - New setting :attr:`mopidy.settings.MIXER_ALSA_CONTROL` for forcing what ALSA
   control :class:`mopidy.mixers.alsa.AlsaMixer` should use.
 

mopidy/__main__.py

@@ -13,6 +13,7 @@ from mopidy import get_version, settings, SettingsError
 from mopidy.process import CoreProcess
 from mopidy.utils import get_class
 from mopidy.utils.path import get_or_create_folder
+from mopidy.utils.settings import list_settings_optparse_callback
 
 logger = logging.getLogger('mopidy.main')
 
@@ -42,6 +43,9 @@ def _parse_options():
     parser.add_option('--dump',
         action='store_true', dest='dump',
         help='dump debug log to file')
+    parser.add_option('--list-settings',
+        action='callback', callback=list_settings_optparse_callback,
+        help='list current settings')
     return parser.parse_args()[0]
 
 def _setup_logging(verbosity_level, dump):

mopidy/utils/settings.py

@@ -102,3 +102,26 @@ def validate_settings(defaults, settings):
             continue
 
     return errors
+
+def list_settings_optparse_callback(*args):
+    """
+    Prints a list of all settings.
+
+    Called by optparse when Mopidy is run with the :option:`--list-settings`
+    option.
+    """
+    from mopidy import settings
+    errors = settings.get_errors()
+    lines = []
+    for (key, value) in sorted(settings.raw_settings.iteritems()):
+        default_value = settings.default_settings.get(key)
+        if key.endswith('PASSWORD'):
+            value = u'********'
+        lines.append(u'%s:' % key)
+        lines.append(u'  Value: %s' % repr(value))
+        if value != default_value and default_value is not None:
+            lines.append(u'  Default: %s' % repr(default_value))
+        if errors.get(key) is not None:
+            lines.append(u'  Error: %s' % errors[key])
+    print u'Settings: %s' % indent('\n'.join(lines), places=2)
+    sys.exit(0)