chromium/src/third_party/blink/tools/blinkpy/common/system/user.py

# Copyright (c) 2009, Google Inc. All rights reserved.
#
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# modification, are permitted provided that the following conditions are
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import logging
import os
import platform
import re
import sys
import webbrowser

from six.moves import input

from blinkpy.common.system.executive import Executive
from blinkpy.common.system.filesystem import FileSystem
from blinkpy.common.system.platform_info import PlatformInfo

_log = logging.getLogger(__name__)


class User(object):
    DEFAULT_NO = 'n'
    DEFAULT_YES = 'y'

    def __init__(self, platform_info=None):
        # We cannot get the PlatformInfo object from a SystemHost because
        # User is part of SystemHost itself.
        self._platform_info = platform_info or PlatformInfo(
            sys, platform, FileSystem(), Executive())

    # FIXME: These are @classmethods because bugzilla.py doesn't have a Tool object (thus no User instance).
    @classmethod
    def prompt(cls, message, repeat=1, input_func=input):
        response = None
        while repeat and not response:
            repeat -= 1
            response = input_func(message)
        return response

    @classmethod
    def _wait_on_list_response(cls, list_items, can_choose_multiple,
                               input_func):
        while True:
            if can_choose_multiple:
                response = cls.prompt(
                    'Enter one or more numbers (comma-separated) or ranges (e.g. 3-7), or \'all\': ',
                    input_func=input_func)
                if not response.strip() or response == 'all':
                    return list_items

                try:
                    indices = []
                    for value in re.split(r"\s*,\s*", response):
                        parts = value.split('-')
                        if len(parts) == 2:
                            indices += range(int(parts[0]) - 1, int(parts[1]))
                        else:
                            indices.append(int(value) - 1)
                except ValueError:
                    continue

                return [list_items[i] for i in indices]
            else:
                try:
                    result = int(
                        cls.prompt('Enter a number: ',
                                   input_func=input_func)) - 1
                except ValueError:
                    continue
                return list_items[result]

    @classmethod
    def prompt_with_list(cls,
                         list_title,
                         list_items,
                         can_choose_multiple=False,
                         input_func=input):
        print(list_title)
        i = 0
        for item in list_items:
            i += 1
            print('%2d. %s' % (i, item))
        return cls._wait_on_list_response(list_items, can_choose_multiple,
                                          input_func)

    def confirm(self, message=None, default=DEFAULT_YES, input_func=input):
        if not message:
            message = 'Continue?'
        choice = {'y': 'Y/n', 'n': 'y/N'}[default]
        response = input_func('%s [%s]: ' % (message, choice))
        response = response.strip().lower()
        if not response:
            response = default
        return response and response[0] == 'y'

    def can_open_url(self):
        # Check if dbus is already running. If dbus is not running, avoid taking
        # actions which could cause it to be autolaunched. For example, chrome
        # tends to autolaunch dbus: if this happens inside testing/xvfb.py, that
        # often causes problems when the autolaunched dbus exits, as dbus sends
        # a kill signal to all killable processes on exit (!!!).
        if (self._platform_info.is_linux()
                and 'DBUS_SESSION_BUS_ADDRESS' not in os.environ):
            _log.warning('dbus is not running, not showing results...')
            return False
        try:
            webbrowser.get()
            return True
        except webbrowser.Error:
            return False

    def open_url(self, url):
        if not self.can_open_url():
            _log.warning('Failed to open %s', url)
            return
        webbrowser.open(url)