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# -*- coding: utf-8 -*-
"""A delimited data output adapter (e.g. CSV, TSV)."""
from __future__ import unicode_literals
import contextlib
from cli_helpers.compat import csv, StringIO
from cli_helpers.utils import filter_dict_by_key
from .preprocessors import bytes_to_string, override_missing_value
supported_formats = ('csv', 'csv-tab')
preprocessors = (override_missing_value, bytes_to_string)
class linewriter(object):
def __init__(self):
self.reset()
def reset(self):
self.line = None
def write(self, d):
self.line = d
def adapter(data, headers, table_format='csv', **kwargs):
"""Wrap the formatting inside a function for TabularOutputFormatter."""
keys = ('dialect', 'delimiter', 'doublequote', 'escapechar',
'quotechar', 'quoting', 'skipinitialspace', 'strict')
if table_format == 'csv':
delimiter = ','
elif table_format == 'csv-tab':
delimiter = '\t'
else:
raise ValueError('Invalid table_format specified.')
ckwargs = {'delimiter': delimiter, 'lineterminator': ''}
ckwargs.update(filter_dict_by_key(kwargs, keys))
l = linewriter()
writer = csv.writer(l, **ckwargs)
writer.writerow(headers)
yield l.line
for row in data:
l.reset()
writer.writerow(row)
yield l.line
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