# -*- 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
[docs]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)
[docs]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
)
[docs]def read_repo_password(question):
"""Prompt the user to enter a password
:param str question: Question to the user
"""
# Please see http://click.pocoo.org/4/api/#click.prompt
return click.prompt(question, hide_input=True)
[docs]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]
[docs]def process_json(user_value):
try:
user_dict = json.loads(
user_value,
object_pairs_hook=OrderedDict,
)
except Exception:
# Leave it up to click to ask the user again
raise click.UsageError('Unable to decode to JSON.')
if not isinstance(user_dict, dict):
# Leave it up to click to ask the user again
raise click.UsageError('Requires JSON dict.')
return user_dict
[docs]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
default_display = 'default'
user_value = click.prompt(
var_name,
default=default_display,
type=click.STRING,
value_proc=process_json,
)
if user_value == default_display:
# Return the given default w/o any processing
return default_value
return user_value
[docs]def render_variable(env, raw, cookiecutter_dict):
"""Inside the prompting taken from the cookiecutter.json file, this renders
the next variable. For example, if a project_name is "Peanut Butter
Cookie", the repo_name could be be rendered with:
`{{ cookiecutter.project_name.replace(" ", "_") }}`.
This is then presented to the user as the default.
:param Environment env: A Jinja2 Environment object.
:param str raw: The next value to be prompted for by the user.
:param dict cookiecutter_dict: The current context as it's gradually
being populated with variables.
:return: The rendered value for the default variable.
"""
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
[docs]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)
[docs]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