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"""Functions to collect user input.
"""
from milc import cli
try:
from milc import format_ansi
except ImportError:
from milc.ansi import format_ansi
def yesno(prompt, *args, default=None, **kwargs):
"""Displays prompt to the user and gets a yes or no response.
Returns True for a yes and False for a no.
If you add `--yes` and `--no` arguments to your program the user can answer questions by passing command line flags.
@add_argument('-y', '--yes', action='store_true', arg_only=True, help='Answer yes to all questions.')
@add_argument('-n', '--no', action='store_true', arg_only=True, help='Answer no to all questions.')
Arguments:
prompt
The prompt to present to the user. Can include ANSI and format strings like milc's `cli.echo()`.
default
Whether to default to a Yes or No when the user presses enter.
None- force the user to enter Y or N
True- Default to yes
False- Default to no
"""
if not args and kwargs:
args = kwargs
if 'no' in cli.args and cli.args.no:
return False
if 'yes' in cli.args and cli.args.yes:
return True
if default is not None:
if default:
prompt = prompt + ' [Y/n] '
else:
prompt = prompt + ' [y/N] '
while True:
cli.echo('')
answer = input(format_ansi(prompt % args))
cli.echo('')
if not answer and prompt is not None:
return default
elif answer.lower() in ['y', 'yes']:
return True
elif answer.lower() in ['n', 'no']:
return False
def question(prompt, *args, default=None, confirm=False, answer_type=str, validate=None, **kwargs):
"""Prompt the user to answer a question with a free-form input.
Arguments:
prompt
The prompt to present to the user. Can include ANSI and format strings like milc's `cli.echo()`.
default
The value to return when the user doesn't enter any value. Use None to prompt until they enter a value.
confirm
Present the user with a confirmation dialog before accepting their answer.
answer_type
Specify a type function for the answer. Will re-prompt the user if the function raises any errors. Common choices here include int, float, and decimal.Decimal.
validate
This is an optional function that can be used to validate the answer. It should return True or False and have the following signature:
def function_name(answer, *args, **kwargs):
"""
if not args and kwargs:
args = kwargs
if default is not None:
prompt = '%s [%s] ' % (prompt, default)
while True:
cli.echo('')
answer = input(format_ansi(prompt % args))
cli.echo('')
if answer:
if validate is not None and not validate(answer, *args, **kwargs):
continue
elif confirm:
if yesno('Is the answer "%s" correct?', answer, default=True):
try:
return answer_type(answer)
except Exception as e:
cli.log.error('Could not convert answer (%s) to type %s: %s', answer, answer_type.__name__, str(e))
else:
try:
return answer_type(answer)
except Exception as e:
cli.log.error('Could not convert answer (%s) to type %s: %s', answer, answer_type.__name__, str(e))
elif default is not None:
return default
def choice(heading, options, *args, default=None, confirm=False, prompt='Please enter your choice: ', **kwargs):
"""Present the user with a list of options and let them pick one.
Users can enter either the number or the text of their choice.
This will return the value of the item they choose, not the numerical index.
Arguments:
heading
The text to place above the list of options.
options
A sequence of items to choose from.
default
The index of the item to return when the user doesn't enter any value. Use None to prompt until they enter a value.
confirm
Present the user with a confirmation dialog before accepting their answer.
prompt
The prompt to present to the user. Can include ANSI and format strings like milc's `cli.echo()`.
"""
if not args and kwargs:
args = kwargs
if prompt and default:
prompt = prompt + ' [%s] ' % (default + 1,)
while True:
# Prompt for an answer.
cli.echo('')
cli.echo(heading % args)
cli.echo('')
for i, option in enumerate(options, 1):
cli.echo('\t{fg_cyan}%d.{fg_reset} %s', i, option)
cli.echo('')
answer = input(format_ansi(prompt))
cli.echo('')
# If the user types in one of the options exactly use that
if answer in options:
return answer
# Massage the answer into a valid integer
if answer == '' and default:
answer = default
else:
try:
answer = int(answer) - 1
except Exception:
# Normally we would log the exception here, but in the interest of clean UI we do not.
cli.log.error('Invalid choice: %s', answer + 1)
continue
# Validate the answer
if answer >= len(options) or answer < 0:
cli.log.error('Invalid choice: %s', answer + 1)
continue
if confirm and not yesno('Is the answer "%s" correct?', answer + 1, default=True):
continue
# Return the answer they chose.
return options[answer]
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