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"""Application base class for displaying data about a single object.
"""
import abc
import logging
import six
from .display import DisplayCommandBase
LOG = logging.getLogger(__name__)
@six.add_metaclass(abc.ABCMeta)
class ShowOne(DisplayCommandBase):
"""Command base class for displaying data about a single object.
"""
@property
def formatter_namespace(self):
return 'cliff.formatter.show'
@property
def formatter_default(self):
return 'table'
@abc.abstractmethod
def take_action(self, parsed_args):
"""Return a two-part tuple with a tuple of column names
and a tuple of values.
"""
def produce_output(self, parsed_args, column_names, data):
if not parsed_args.columns:
columns_to_include = column_names
else:
columns_to_include = [c for c in column_names
if c in parsed_args.columns]
# Set up argument to compress()
selector = [(c in columns_to_include)
for c in column_names]
data = list(self._compress_iterable(data, selector))
self.formatter.emit_one(columns_to_include,
data,
self.app.stdout,
parsed_args)
return 0
def dict2columns(self, data):
"""Implement the common task of converting a dict-based object
to the two-column output that ShowOne expects.
"""
if not data:
return ({}, {})
else:
return zip(*sorted(data.items()))
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