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119 lines
3.6 KiB
Python
119 lines
3.6 KiB
Python
# The MIT License (MIT)
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#
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# Copyright (c) 2016 Digital Sapphire
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#
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# Permission is hereby granted, free of charge, to any person obtaining a copy
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# of this software and associated documentation files (the "Software"), to deal
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# in the Software without restriction, including without limitation the rights
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# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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# copies of the Software, and to permit persons to whom the Software is
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# furnished to do so, subject to the following conditions:
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#
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# The above copyright notice and this permission notice shall be included in
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# all copies or substantial portions of the Software.
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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# SOFTWARE.
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import logging
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import sys
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import six
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from menus.exceptions import MenusError
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# Preventing import errors on non windows
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# platforms
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if sys.platform == 'win32':
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import msvcrt
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else:
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import termios
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import tty
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log = logging.getLogger(__name__)
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if sys.platform == 'win32':
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clear_screen_cmd = 'cls'
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else:
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clear_screen_cmd = 'clear'
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def check_commands_else_raise(options):
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# We need a least one thing to display
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# Using this as a teaching aid. Also making the use of
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# Engine(example=Ture) very explicit
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if len(options) == 0:
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msg = ('You must pass a menus object or initilize '
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'like -> Engine(example=True)')
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raise MenusError(msg, expected=True)
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# We need a list or tuple to loop through
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if not isinstance(options, list):
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if not isinstance(options, tuple):
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msg = ('You must pass a list or tuple to menus.')
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raise MenusError(msg, expected=True)
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if len(options) > 9:
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msg = ('Cannot have more then 8 options per menu')
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raise MenusError(msg, expected=True)
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for o in options:
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# Ensuring each item in list/tuple is a tuple
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if not isinstance(o, tuple):
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raise MenusError('Item must be tuple: {}'.format(o), expected=True)
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if len(o) != 2:
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raise MenusError('Invalid number of tuple '
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'items:\n\n{}'.format(o))
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# Ensure index 0 is a str
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if not isinstance(o[0], six.string_types):
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msg = 'Menus are passed as [("Menu Name", MenuObject())]'
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raise MenusError(msg)
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return True
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# Gets a single character form standard input. Does not echo to the screen
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class Getch(object):
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def __init__(self):
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if sys.platform == 'win32':
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self.impl = GetchWindows()
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else:
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self.impl = GetchUnix()
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def __call__(self):
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return self.impl()
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class GetchUnix(object):
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def __init__(self):
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# Not sure if these imports are required here
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# import tty, sys
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pass
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def __call__(self):
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fd = sys.stdin.fileno()
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old_settings = termios.tcgetattr(fd)
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try:
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tty.setraw(sys.stdin.fileno())
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ch = sys.stdin.read(1)
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finally:
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termios.tcsetattr(fd, termios.TCSADRAIN, old_settings)
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return ch
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class GetchWindows(object):
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def __init__(self):
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# Not sure if this import is required
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# import msvcrt
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pass
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def __call__(self):
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return msvcrt.getch()
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