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# This file contains functions taken from the user interface of the beet
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# tool (http://beets.radbox.org).
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#
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# Copyright 2013, Adrian Sampson.
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#
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# Permission is hereby granted, free of charge, to any person obtaining
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# a copy of this software and associated documentation files (the
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# "Software"), to deal in the Software without restriction, including
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# without limitation the rights to use, copy, modify, merge, publish,
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# distribute, sublicense, and/or sell copies of the Software, and to
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# permit persons to whom the Software is furnished to do so, subject to
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# the following conditions:
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#
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# The above copyright notice and this permission notice shall be
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# included in all copies or substantial portions of the Software.
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import locale
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import sys
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from .p3 import input
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class UserError(Exception):
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"""UI exception. Commands should throw this in order to display
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nonrecoverable errors to the user.
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"""
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pass
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def _encoding(config):
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"""Tries to guess the encoding used by the terminal."""
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# Configured override?
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# Determine from locale settings.
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try:
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default_enc = locale.getdefaultlocale()[1] or 'utf8'
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except ValueError:
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# Invalid locale environment variable setting. To avoid
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# failing entirely for no good reason, assume UTF-8.
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default_enc = 'utf8'
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return config.get('terminal-encoding', default_enc)
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def input_():
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"""Get input and decodes the result to a Unicode string.
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Raises a UserError if stdin is not available. The prompt is sent to
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stdout rather than stderr. A printed between the prompt and the
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input cursor.
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"""
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# raw_input incorrectly sends prompts to stderr, not stdout, so we
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# use print() explicitly to display prompts.
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# http://bugs.python.org/issue1927
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try:
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resp = input()
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except EOFError:
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raise UserError('stdin stream ended while input required')
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return resp.decode(sys.stdin.encoding or 'utf8', 'ignore')
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