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"""Utility module.""" |
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from typing import AnyStr, Union |
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from neovim import Nvim |
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_cached_encoding = None # type: str |
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def get_encoding(nvim: Nvim) -> str: |
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"""Return a Vim's internal encoding. |
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The retrieve encoding is cached to the function instance while encoding |
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options should not be changed in Vim's live session (see :h encoding) to |
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enhance performance. |
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Args: |
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nvim (neovim.Nvim): A ``neovim.Nvim`` instance. |
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Returns: |
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str: A Vim's internal encoding. |
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""" |
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global _cached_encoding |
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if _cached_encoding is None: |
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_cached_encoding = nvim.options['encoding'] |
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return _cached_encoding |
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def ensure_bytes(nvim: Nvim, seed: AnyStr) -> bytes: |
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"""Encode `str` to `bytes` if necessary and return. |
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Args: |
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nvim (neovim.Nvim): A ``neovim.Nvim`` instance. |
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seed (AnyStr): A str or bytes instance. |
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Example: |
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>>> from unittest.mock import MagicMock |
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>>> nvim = MagicMock() |
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>>> nvim.options = {'encoding': 'utf-8'} |
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>>> ensure_bytes(nvim, b'a') |
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b'a' |
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>>> ensure_bytes(nvim, 'a') |
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b'a' |
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Returns: |
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bytes: A bytes represantation of ``seed``. |
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""" |
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if isinstance(seed, str): |
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encoding = get_encoding(nvim) |
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return seed.encode(encoding, 'surrogateescape') |
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return seed |
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def ensure_str(nvim: Nvim, seed: AnyStr) -> str: |
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"""Decode `bytes` to `str` if necessary and return. |
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Args: |
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nvim (neovim.Nvim): A ``neovim.Nvim`` instance. |
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seed (AnyStr): A str or bytes instance. |
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Example: |
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>>> from unittest.mock import MagicMock |
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>>> nvim = MagicMock() |
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>>> nvim.options = {'encoding': 'utf-8'} |
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>>> ensure_str(nvim, b'a') |
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'a' |
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>>> ensure_str(nvim, 'a') |
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'a' |
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Returns: |
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str: A str represantation of ``seed``. |
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""" |
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if isinstance(seed, bytes): |
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encoding = get_encoding(nvim) |
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return seed.decode(encoding, 'surrogateescape') |
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return seed |
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def int2char(nvim: Nvim, code: int) -> str: |
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"""Return a corresponding char of `code`. |
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It uses "nr2char()" in Vim script when 'encoding' option is not utf-8. |
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Otherwise it uses "chr()" in Python to improve the performance. |
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Args: |
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nvim (neovim.Nvim): A ``neovim.Nvim`` instance. |
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code (int): A int which represent a single character. |
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Example: |
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>>> from unittest.mock import MagicMock |
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>>> nvim = MagicMock() |
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>>> nvim.options = {'encoding': 'utf-8'} |
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>>> int2char(nvim, 97) |
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'a' |
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Returns: |
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str: A str of ``code``. |
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""" |
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encoding = get_encoding(nvim) |
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if encoding in ('utf-8', 'utf8'): |
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return chr(code) |
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return nvim.call('nr2char', code) |
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def int2repr(nvim: Nvim, code: Union[int, bytes]) -> str: |
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from .key import Key |
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if isinstance(code, int): |
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return int2char(nvim, code) |
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return Key.represent(nvim, ensure_bytes(nvim, code)) |
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def getchar(nvim: Nvim, *args) -> Union[int, bytes]: |
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"""Call getchar and return int or bytes instance. |
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Args: |
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nvim (neovim.Nvim): A ``neovim.Nvim`` instance. |
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*args: Arguments passed to getchar function in Vim. |
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Returns: |
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Union[int, bytes]: A int or bytes. |
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""" |
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try: |
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ret = nvim.call('getchar', *args) |
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if isinstance(ret, int): |
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return ret |
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return ensure_bytes(nvim, ret) |
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except nvim.error as e: |
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# NOTE: |
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# Vim returns 0x03 when ^C is pressed but Neovim. |
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# Additionally, KeyboardInterrupt is not raised but |
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# A general nvim.error and only the following dirty |
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# implementation works. |
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if str(e) == "b'Keyboard interrupt'": |
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return 0x03 # ^C |
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raise e |
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def safeget(l: list, index: int, default=None): |
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"""Return an index item of list or default.""" |
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try: |
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return l[index] |
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except IndexError: |
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return default |
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# http://python-3-patterns-idioms-test.readthedocs.io/en/latest/Metaprogramming.html |
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class Singleton(type): |
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"""A singleton metaclass.""" |
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instance = None |
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def __call__(cls, *args, **kwargs): |
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if not cls.instance: |
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cls.instance = super().__call__(*args, **kwargs) |
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return cls.instance |
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lambdalisue /
neovim-prompt
