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# Copyright 1999-2009 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
from __future__ import print_function
import sys
from portage.output import bold, create_color_func
def userquery(prompt, enter_invalid, responses=None, colours=None):
"""Displays a prompt and a set of responses, then waits for a response
which is checked against the responses and the first to match is
returned. An empty response will match the first value in responses,
unless enter_invalid is True. The input buffer is *not* cleared prior
to the prompt!
prompt: a String.
responses: a List of Strings.
colours: a List of Functions taking and returning a String, used to
process the responses for display. Typically these will be functions
like red() but could be e.g. lambda x: "DisplayString".
If responses is omitted, defaults to ["Yes", "No"], [green, red].
If only colours is omitted, defaults to [bold, ...].
Returns a member of the List responses. (If called without optional
arguments, returns "Yes" or "No".)
KeyboardInterrupt is converted to SystemExit to avoid tracebacks being
printed."""
if responses is None:
responses = ["Yes", "No"]
colours = [
create_color_func("PROMPT_CHOICE_DEFAULT"),
create_color_func("PROMPT_CHOICE_OTHER")
]
elif colours is None:
colours=[bold]
colours=(colours*len(responses))[:len(responses)]
print(bold(prompt), end=' ')
try:
while True:
if sys.hexversion >= 0x3000000:
response=input("["+"/".join([colours[i](responses[i]) for i in range(len(responses))])+"] ")
else:
response=raw_input("["+"/".join([colours[i](responses[i]) for i in range(len(responses))])+"] ")
if response or not enter_invalid:
for key in responses:
# An empty response will match the
# first value in responses.
if response.upper()==key[:len(response)].upper():
return key
print("Sorry, response '%s' not understood." % response, end=' ')
except (EOFError, KeyboardInterrupt):
print("Interrupted.")
sys.exit(1)
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