prompt_for_config() - Code Metrics - Inspection of "Merge branch 'freakboy3742-dict_variables'" - audreyr/cookiecutter - Measure and Improve Code Quality continuously with Scrutinizer

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created 2016-10-08 00:20 UTC

prompt_for_config() D

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cc	11
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f	0
dl	0
loc	54
rs	4.4999

How to fix Long Method Complexity

# -*- coding: utf-8 -*-

"""
cookiecutter.prompt
---------------------

Functions for prompting the user for project info.
"""

from collections import OrderedDict
import json

import click
from past.builtins import basestring

from future.utils import iteritems

from jinja2.exceptions import UndefinedError

from .exceptions import UndefinedVariableInTemplate
from .environment import StrictEnvironment


def read_user_variable(var_name, default_value):
    """Prompt the user for the given variable and return the entered value
    or the given default.

    :param str var_name: Variable of the context to query the user
    :param default_value: Value that will be returned if no input happens
    """
    # Please see http://click.pocoo.org/4/api/#click.prompt
    return click.prompt(var_name, default=default_value)


def read_user_yes_no(question, default_value):
    """Prompt the user to reply with 'yes' or 'no' (or equivalent values).

    Note:
      Possible choices are 'true', '1', 'yes', 'y' or 'false', '0', 'no', 'n'

    :param str question: Question to the user
    :param default_value: Value that will be returned if no input happens
    """
    # Please see http://click.pocoo.org/4/api/#click.prompt
    return click.prompt(
        question,
        default=default_value,
        type=click.BOOL
    )


def read_user_choice(var_name, options):
    """Prompt the user to choose from several options for the given variable.

    The first item will be returned if no input happens.

    :param str var_name: Variable as specified in the context
    :param list options: Sequence of options that are available to select from
    :return: Exactly one item of ``options`` that has been chosen by the user
    """
    # Please see http://click.pocoo.org/4/api/#click.prompt
    if not isinstance(options, list):
        raise TypeError

    if not options:
        raise ValueError

    choice_map = OrderedDict(
        (u'{}'.format(i), value) for i, value in enumerate(options, 1)
    )
    choices = choice_map.keys()
    default = u'1'

    choice_lines = [u'{} - {}'.format(*c) for c in choice_map.items()]
    prompt = u'\n'.join((
        u'Select {}:'.format(var_name),
        u'\n'.join(choice_lines),
        u'Choose from {}'.format(u', '.join(choices))
    ))

    user_choice = click.prompt(
        prompt, type=click.Choice(choices), default=default
    )
    return choice_map[user_choice]


def read_user_dict(var_name, default_value):
    """Prompt the user to provide a dictionary of data.

    :param str var_name: Variable as specified in the context
    :param default_value: Value that will be returned if no input is provided
    :return: A Python dictionary to use in the context.
    """
    # Please see http://click.pocoo.org/4/api/#click.prompt
    if not isinstance(default_value, dict):
        raise TypeError

    raw = click.prompt(var_name, default='default')
    if raw != 'default':
        value = json.loads(raw, object_hook=OrderedDict)
    else:
        value = default_value

    return value


def render_variable(env, raw, cookiecutter_dict):
    if raw is None:
        return None
    elif isinstance(raw, dict):
        return {
            render_variable(env, k, cookiecutter_dict):
                render_variable(env, v, cookiecutter_dict)
            for k, v in raw.items()
        }
    elif isinstance(raw, list):
        return [
            render_variable(env, v, cookiecutter_dict)
            for v in raw
        ]
    elif not isinstance(raw, basestring):
        raw = str(raw)

    template = env.from_string(raw)

    rendered_template = template.render(cookiecutter=cookiecutter_dict)
    return rendered_template


def prompt_choice_for_config(cookiecutter_dict, env, key, options, no_input):
    """Prompt the user which option to choose from the given. Each of the
    possible choices is rendered beforehand.
    """
    rendered_options = [
        render_variable(env, raw, cookiecutter_dict) for raw in options
    ]

    if no_input:
        return rendered_options[0]
    return read_user_choice(key, rendered_options)


def prompt_for_config(context, no_input=False):
    """
    Prompts the user to enter new config, using context as a source for the
    field names and sample values.

    :param no_input: Prompt the user at command line for manual configuration?
    """
    cookiecutter_dict = {}
    env = StrictEnvironment(context=context)

    # First pass: Handle simple and raw variables, plus choices.
    # These must be done first because the dictionaries keys and
    # values might refer to them.
    for key, raw in iteritems(context[u'cookiecutter']):
        if key.startswith(u'_'):
            cookiecutter_dict[key] = raw
            continue

        try:
            if isinstance(raw, list):
                # We are dealing with a choice variable
                val = prompt_choice_for_config(
                    cookiecutter_dict, env, key, raw, no_input
                )
                cookiecutter_dict[key] = val
            elif not isinstance(raw, dict):
                # We are dealing with a regular variable
                val = render_variable(env, raw, cookiecutter_dict)

                if not no_input:
                    val = read_user_variable(key, val)

                cookiecutter_dict[key] = val
        except UndefinedError as err:
            msg = "Unable to render variable '{}'".format(key)
            raise UndefinedVariableInTemplate(msg, err, context)

    # Second pass; handle the dictionaries.
    for key, raw in iteritems(context[u'cookiecutter']):

        try:
            if isinstance(raw, dict):
                # We are dealing with a dict variable
                val = render_variable(env, raw, cookiecutter_dict)

                if not no_input:
                    val = read_user_dict(key, val)

                cookiecutter_dict[key] = val
        except UndefinedError as err:
            msg = "Unable to render variable '{}'".format(key)
            raise UndefinedVariableInTemplate(msg, err, context)

    return cookiecutter_dict


1			# -- coding: utf-8 --
2
3			"""
4			cookiecutter.prompt
5			---------------------
6
7			Functions for prompting the user for project info.
8			"""
9
10			from collections import OrderedDict
11			import json
12
13			import click
14			from past.builtins import basestring
15
16			from future.utils import iteritems
17
18			from jinja2.exceptions import UndefinedError
19
20			from .exceptions import UndefinedVariableInTemplate
21			from .environment import StrictEnvironment
22
23
24			def read_user_variable(var_name, default_value):
25			"""Prompt the user for the given variable and return the entered value
26			or the given default.
27
28			:param str var_name: Variable of the context to query the user
29			:param default_value: Value that will be returned if no input happens
30			"""
31			# Please see http://click.pocoo.org/4/api/#click.prompt
32			return click.prompt(var_name, default=default_value)
33
34
35			def read_user_yes_no(question, default_value):
36			"""Prompt the user to reply with 'yes' or 'no' (or equivalent values).
37
38			Note:
39			Possible choices are 'true', '1', 'yes', 'y' or 'false', '0', 'no', 'n'
40
41			:param str question: Question to the user
42			:param default_value: Value that will be returned if no input happens
43			"""
44			# Please see http://click.pocoo.org/4/api/#click.prompt
45			return click.prompt(
46			question,
47			default=default_value,
48			type=click.BOOL
49			)
50
51
52			def read_user_choice(var_name, options):
53			"""Prompt the user to choose from several options for the given variable.
54
55			The first item will be returned if no input happens.
56
57			:param str var_name: Variable as specified in the context
58			:param list options: Sequence of options that are available to select from
59			:return: Exactly one item of ``options`` that has been chosen by the user
60			"""
61			# Please see http://click.pocoo.org/4/api/#click.prompt
62			if not isinstance(options, list):
63			raise TypeError
64
65			if not options:
66			raise ValueError
67
68			choice_map = OrderedDict(
69			(u'{}'.format(i), value) for i, value in enumerate(options, 1)
70			)
71			choices = choice_map.keys()
72			default = u'1'
73
74			choice_lines = [u'{} - {}'.format(*c) for c in choice_map.items()]
75			prompt = u'\n'.join((
76			u'Select {}:'.format(var_name),
77			u'\n'.join(choice_lines),
78			u'Choose from {}'.format(u', '.join(choices))
79			))
80
81			user_choice = click.prompt(
82			prompt, type=click.Choice(choices), default=default
83			)
84			return choice_map[user_choice]
85
86
87			def read_user_dict(var_name, default_value):
88			"""Prompt the user to provide a dictionary of data.
89
90			:param str var_name: Variable as specified in the context
91			:param default_value: Value that will be returned if no input is provided
92			:return: A Python dictionary to use in the context.
93			"""
94			# Please see http://click.pocoo.org/4/api/#click.prompt
95			if not isinstance(default_value, dict):
96			raise TypeError
97
98			raw = click.prompt(var_name, default='default')
99			if raw != 'default':
100			value = json.loads(raw, object_hook=OrderedDict)
101			else:
102			value = default_value
103
104			return value
105
106
107			def render_variable(env, raw, cookiecutter_dict):
108			if raw is None:
109			return None
110			elif isinstance(raw, dict):
111			return {
112			render_variable(env, k, cookiecutter_dict):
113			render_variable(env, v, cookiecutter_dict)
114			for k, v in raw.items()
115			}
116			elif isinstance(raw, list):
117			return [
118			render_variable(env, v, cookiecutter_dict)
119			for v in raw
120			]
121			elif not isinstance(raw, basestring):
122			raw = str(raw)
123
124			template = env.from_string(raw)
125
126			rendered_template = template.render(cookiecutter=cookiecutter_dict)
127			return rendered_template
128
129
130			def prompt_choice_for_config(cookiecutter_dict, env, key, options, no_input):
131			"""Prompt the user which option to choose from the given. Each of the
132			possible choices is rendered beforehand.
133			"""
134			rendered_options = [
135			render_variable(env, raw, cookiecutter_dict) for raw in options
136			]
137
138			if no_input:
139			return rendered_options[0]
140			return read_user_choice(key, rendered_options)
141
142
143			def prompt_for_config(context, no_input=False):
144			"""
145			Prompts the user to enter new config, using context as a source for the
146			field names and sample values.
147
148			:param no_input: Prompt the user at command line for manual configuration?
149			"""
150			cookiecutter_dict = {}
151			env = StrictEnvironment(context=context)
152
153			# First pass: Handle simple and raw variables, plus choices.
154			# These must be done first because the dictionaries keys and
155			# values might refer to them.
156			for key, raw in iteritems(context[u'cookiecutter']):
157			if key.startswith(u'_'):
158			cookiecutter_dict[key] = raw
159			continue
160
161			try:
162			if isinstance(raw, list):
163			# We are dealing with a choice variable
164			val = prompt_choice_for_config(
165			cookiecutter_dict, env, key, raw, no_input
166			)
167			cookiecutter_dict[key] = val
168			elif not isinstance(raw, dict):
169			# We are dealing with a regular variable
170			val = render_variable(env, raw, cookiecutter_dict)
171
172			if not no_input:
173			val = read_user_variable(key, val)
174
175			cookiecutter_dict[key] = val
176			except UndefinedError as err:
177			msg = "Unable to render variable '{}'".format(key)
178			raise UndefinedVariableInTemplate(msg, err, context)
179
180			# Second pass; handle the dictionaries.
181			for key, raw in iteritems(context[u'cookiecutter']):
182
183			try:
184			if isinstance(raw, dict):
185			# We are dealing with a dict variable
186			val = render_variable(env, raw, cookiecutter_dict)
187
188			if not no_input:
189			val = read_user_dict(key, val)
190
191			cookiecutter_dict[key] = val
192			except UndefinedError as err:
193			msg = "Unable to render variable '{}'".format(key)
194			raise UndefinedVariableInTemplate(msg, err, context)
195
196			return cookiecutter_dict
197

audreyr / cookiecutter

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