tools/qvm-prefs: re-add --help-properties action

Specific VM object is required to get list of properties and help on
them, so convert HelpPropertiesAction into normal action (like --get or
--set).

qubesmgmt/tools/__init__.py

@@ -105,48 +105,6 @@ class SinglePropertyAction(argparse.Action):
             if self.const is None else self.const
 
 
-# class HelpPropertiesAction(argparse.Action):
-#     '''Action for argument parser that displays all properties and exits.'''
-#     # pylint: disable=redefined-builtin,too-few-public-methods
-#     def __init__(self,
-#             option_strings,
-#             klass=None,
-#             dest=argparse.SUPPRESS,
-#             default=argparse.SUPPRESS,
-#             help='list all available properties with short descriptions'
-#                 ' and exit'):
-#         super(HelpPropertiesAction, self).__init__(
-#             option_strings=option_strings,
-#             dest=dest,
-#             default=default,
-#             nargs=0,
-#             help=help)
-#
-#         # late import because of circular dependency
-#         import qubes # pylint: disable=redefined-outer-name
-#         self._klass = klass if klass is not None else qubes.Qubes
-#
-#
-#     def __call__(self, parser, namespace, values, option_string=None):
-#         # pylint: disable=redefined-outer-name
-#         properties = self._klass.property_list()
-#         width = max(len(prop.__name__) for prop in properties)
-#         wrapper = textwrap.TextWrapper(width=80,
-#             initial_indent='  ', subsequent_indent=' ' * (width + 6))
-#
-#         text = 'Common properties:\n' + '\n'.join(
-#             wrapper.fill('{name:{width}s}  {doc}'.format(
-#                 name=prop.__name__,
-#                 doc=qubesmgmt.utils.format_doc(prop.__doc__) if prop.__doc__
-#                 else'',
-#                 width=width))
-#             for prop in sorted(properties))
-#         if self._klass is not qubes.Qubes:
-#             text += '\n\n' \
-#                 'There may be more properties in specific domain classes.\n'
-#         parser.exit(message=text)
-#
-
 class VmNameAction(QubesAction):
     ''' Action for parsing one ore multiple domains from provided VMNAMEs '''
 

qubesmgmt/tools/qvm_ls.py

@@ -451,8 +451,11 @@ class _HelpColumnsAction(argparse.Action):
                 doc=column.__doc__ or '',
                 width=width))
             for column in sorted(Column.columns.values()))
+        text += '\n\nAdditionally any VM property may be used as a column, ' \
+                'see qvm-prefs --help-properties for available values'
         parser.exit(message=text + '\n')
 
+
 class _HelpFormatsAction(argparse.Action):
     '''Action for argument parser that displays all formats and exits.'''
     # pylint: disable=redefined-builtin

qubesmgmt/tools/qvm_prefs.py

@@ -19,12 +19,12 @@
 # with this program; if not, see <http://www.gnu.org/licenses/>.
 
 ''' Manipulate VM properties.'''
-# TODO list properties for all classes
 # TODO list only non-default properties
 
 from __future__ import print_function
 
 import sys
+import textwrap
 
 import qubesmgmt
 import qubesmgmt.tools
@@ -37,9 +37,9 @@ def get_parser(vmname_nargs=1):
     parser = qubesmgmt.tools.QubesArgumentParser(
         vmname_nargs=vmname_nargs)
 
-    # parser.add_argument('--help-properties',
-    #     action=qubesmgmt.tools.HelpPropertiesAction,
-    #     klass=qubesmgmt.vm.QubesVM)
+    parser.add_argument('--help-properties',
+        action='store_true',
+        help='list all available properties with short descriptions and exit')
 
     parser.add_argument('--get', '-g',
         action='store_true',
@@ -75,6 +75,20 @@ def process_actions(parser, args, target):
     :param args: arguments to handle
     :param target: object on which actions should be performed
     '''
+    if args.help_properties:
+        properties = target.property_list()
+        width = max(len(prop) for prop in properties)
+        wrapper = textwrap.TextWrapper(width=80,
+            initial_indent='  ', subsequent_indent=' ' * (width + 6))
+
+        for prop in sorted(properties):
+            help_text = target.property_help(prop)
+
+            print(wrapper.fill('{name:{width}s}  {help_text!s}'.format(
+                name=prop, width=width, help_text=help_text)))
+
+        return 0
+
     if args.property is None:
         properties = target.property_list()
         width = max(len(prop) for prop in properties)