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"""Output formatters using shell syntax.
"""
from .base import SingleFormatter
import argparse
import six
class ShellFormatter(SingleFormatter):
def add_argument_group(self, parser):
group = parser.add_argument_group(
title='shell formatter',
description='a format a UNIX shell can parse (variable="value")',
)
group.add_argument(
'--variable',
action='append',
default=[],
dest='variables',
metavar='VARIABLE',
help=argparse.SUPPRESS,
)
group.add_argument(
'--prefix',
action='store',
default='',
dest='prefix',
help='add a prefix to all variable names',
)
def emit_one(self, column_names, data, stdout, parsed_args):
variable_names = [c.lower().replace(' ', '_')
for c in column_names
]
desired_columns = parsed_args.variables
for name, value in zip(variable_names, data):
if name in desired_columns or not desired_columns:
if isinstance(value, six.string_types):
value = value.replace('"', '\\"')
stdout.write('%s%s="%s"\n' % (parsed_args.prefix, name, value))
return
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