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"""
This module provides functions for creating CommandLine objects from YAML
and vice versa.
"""
import json
import yaml
from . import dictionary_source
from . import scheme_validator
from .str_utils import indent
from .extended_yaml_parser import ExtendedYAMLParser
from .cli import ExtendedBool
# pylint: disable=redefined-builtin
def option_to_yaml(dictionary):
'''Convert an option dictionary to YAML.'''
option_strings = dictionary['option_strings']
metavar = dictionary.get('metavar', None)
help = dictionary.get('help', None)
optional_arg = dictionary.get('optional_arg', False)
groups = dictionary.get('groups', None)
repeatable = dictionary.get('repeatable', ExtendedBool.INHERIT)
final = dictionary.get('final', False)
hidden = dictionary.get('hidden', False)
complete = dictionary.get('complete', None)
when = dictionary.get('when', None)
capture = dictionary.get('capture', None)
r = '- option_strings: %s\n' % json.dumps(option_strings)
if metavar is not None:
r += ' metavar: %s\n' % json.dumps(metavar)
if help is not None:
r += ' help: %s\n' % json.dumps(help)
if optional_arg is True:
r += ' optional_arg: %s\n' % json.dumps(optional_arg)
if groups is not None:
r += ' groups: %s\n' % json.dumps(groups)
if repeatable != ExtendedBool.INHERIT:
r += ' repeatable: %s\n' % json.dumps(repeatable)
if final is not False:
r += ' final: %s\n' % json.dumps(final)
if hidden is not False:
r += ' hidden: %s\n' % json.dumps(hidden)
if complete is not None:
r += ' complete: %s\n' % json.dumps(complete)
if when is not None:
r += ' when: %s\n' % json.dumps(when)
if capture is not None:
r += ' capture: %s\n' % json.dumps(capture)
return r.rstrip()
def positional_to_yaml(dictionary):
'''Convert a positional dictionary to YAML.'''
number = dictionary['number']
metavar = dictionary.get('metavar', None)
help = dictionary.get('help', None)
repeatable = dictionary.get('repeatable', False)
complete = dictionary.get('complete', None)
when = dictionary.get('when', None)
capture = dictionary.get('capture', None)
r = '- number: %d\n' % number
if metavar is not None:
r += ' metavar: %s\n' % json.dumps(metavar)
if help is not None:
r += ' help: %s\n' % json.dumps(help)
if repeatable is not False:
r += ' repeatable: %s\n' % json.dumps(repeatable)
if complete is not None:
r += ' complete: %s\n' % json.dumps(complete)
if when is not None:
r += ' when: %s\n' % json.dumps(when)
if capture is not None:
r += ' capture: %s\n' % json.dumps(capture)
return r.rstrip()
def to_yaml(dictionary):
'''Convert a single dictionary to YAML.'''
prog = dictionary['prog']
aliases = dictionary.get('aliases', None)
help = dictionary.get('help', None)
abbreviate_commands = dictionary.get('abbreviate_commands', ExtendedBool.INHERIT)
abbreviate_options = dictionary.get('abbreviate_options', ExtendedBool.INHERIT)
inherit_options = dictionary.get('inherit_options', ExtendedBool.INHERIT)
options = dictionary.get('options', None)
positionals = dictionary.get('positionals', None)
r = 'prog: %s\n' % json.dumps(prog)
if aliases is not None:
r += 'aliases: %s\n' % json.dumps(aliases)
if help is not None:
r += 'help: %s\n' % json.dumps(help)
if abbreviate_commands != ExtendedBool.INHERIT:
r += 'abbreviate_commands: %s\n' % json.dumps(abbreviate_commands)
if abbreviate_options != ExtendedBool.INHERIT:
r += 'abbreviate_options: %s\n' % json.dumps(abbreviate_options)
if inherit_options != ExtendedBool.INHERIT:
r += 'inherit_options: %s\n' % json.dumps(inherit_options)
if options:
r += 'options:\n'
for option in options:
r += indent(option_to_yaml(option), 2)
r += '\n\n'
if positionals:
r += 'positionals:\n'
for positional in positionals:
r += indent(positional_to_yaml(positional), 2)
r += '\n\n'
return r.rstrip()
def commandline_to_yaml(commandline):
'''Convert a cli.CommandLine object to YAML.'''
dictionaries = dictionary_source.commandline_to_dictionaries(commandline)
r = []
for dictionary in dictionaries:
r.append(to_yaml(dictionary))
return '\n---\n'.join(r)
def load_from_file(file):
'''Load a YAML file and turn it into a cli.CommandLine object.'''
# First, load using normal yaml loader. It gives better error messages
# in case of syntax errors.
with open(file, 'r', encoding='utf-8') as fh:
dictionaries = list(yaml.safe_load_all(fh))
# Then load using extended yaml loader...
with open(file, 'r', encoding='utf-8') as fh:
content = fh.read()
# Validate YAML...
parser = ExtendedYAMLParser()
parsed = parser.parse(content)
scheme_validator.validate(parsed)
# Finally convert the config structure to CommandLine objects
return dictionary_source.dictionaries_to_commandline(dictionaries)
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