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"""Application base class for providing a list of data as output.
"""
import abc
import logging
from .display import DisplayCommandBase
LOG = logging.getLogger(__name__)
class Lister(DisplayCommandBase):
"""Command base class for providing a list of data as output.
"""
__metaclass__ = abc.ABCMeta
@property
def formatter_namespace(self):
return 'cliff.formatter.list'
@property
def formatter_default(self):
return 'table'
@abc.abstractmethod
def take_action(self, parsed_args):
"""Return a tuple containing the column names and an iterable
containing the data to be listed.
"""
def produce_output(self, parsed_args, column_names, data):
if not parsed_args.columns:
columns_to_include = column_names
data_gen = data
else:
columns_to_include = [c for c in column_names
if c in parsed_args.columns
]
if not columns_to_include:
raise ValueError('No recognized column names in %s' %
str(parsed_args.columns))
# Set up argument to compress()
selector = [(c in columns_to_include)
for c in column_names]
# Generator expression to only return the parts of a row
# of data that the user has expressed interest in
# seeing. We have to convert the compress() output to a
# list so the table formatter can ask for its length.
data_gen = (list(self._compress_iterable(row, selector))
for row in data)
self.formatter.emit_list(columns_to_include,
data_gen,
self.app.stdout,
parsed_args,
)
return 0
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