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"""Command-line history module.""" |
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import weakref |
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from neovim import Nvim |
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from .prompt import Prompt |
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class History: |
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"""History class which manage a Vim's command-line history for input.""" |
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__slots__ = ('prompt', '_index', '_cached', '_backward', '_threshold') |
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def __init__(self, prompt: Prompt) -> None: |
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"""Constructor. |
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Args: |
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prompt (Prompt): The ``prompt.prompt.Prompt`` instance. The |
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instance is used to initialize internal variables and never |
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stored. |
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""" |
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self.prompt = weakref.proxy(prompt) |
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self._index = 0 |
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self._cached = prompt.text |
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self._backward = prompt.caret.get_backward_text() |
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self._threshold = 0 |
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@property |
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def nvim(self) -> Nvim: |
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"""A ``neovim.Nvim`` instance.""" |
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return self.prompt.nvim |
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def current(self) -> str: |
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"""Current command-line history value of input. |
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Returns: |
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str: A current command-line history value of input which an |
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internal index points to. It returns a cached value when the |
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internal index points to 0. |
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""" |
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if self._index == 0: |
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return self._cached |
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return self.nvim.call('histget', 'input', -self._index) |
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def previous(self) -> str: |
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"""Get previous command-line history value of input. |
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It increases an internal index and points to a previous command-line |
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history value. |
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Note that it cahces a ``prompt.text`` when the internal index was 0 (an |
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initial value) and the cached value is used when the internal index |
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points to 0. |
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This behaviour is to mimic a Vim's builtin command-line history |
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behaviour. |
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Returns: |
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str: A previous command-line history value of input. |
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""" |
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if self._index == 0: |
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self._cached = self.prompt.text |
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self._threshold = self.nvim.call('histnr', 'input') |
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if self._index < self._threshold: |
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self._index += 1 |
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return self.current() |
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def next(self) -> str: |
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"""Get next command-line history value of input. |
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It decreases an internal index and points to a next command-line |
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history value. |
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Returns: |
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str: A next command-line history value of input. |
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""" |
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if self._index == 0: |
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self._cached = self.prompt.text |
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self._threshold = self.nvim.call('histnr', 'input') |
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if self._index > 0: |
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self._index -= 1 |
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return self.current() |
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def previous_match(self) -> str: |
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""" |
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Get previous matched command-line history value of input. |
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The initial query text is a text before the cursor when an internal |
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index was 0 (like a cached value but only before the cursor.) |
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It increases an internal index until a previous command-line history |
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value matches to an initial query text and points to the matched |
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previous history value. |
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This behaviour is to mimic a Vim's builtin command-line history |
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behaviour. |
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Returns: |
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str: A matched previous command-line history value of input. |
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""" |
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if self._index == 0: |
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self._backward = self.prompt.caret.get_backward_text() |
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index = _index = self._index - 1 |
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while _index < self._index: |
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_index = self._index |
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candidate = self.previous() |
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if candidate.startswith(self._backward): |
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return candidate |
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self._index = index |
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return self.previous() |
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def next_match(self) -> str: |
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"""Get next matched command-line history value of input. |
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The initial query text is a text before the cursor when an internal |
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index was 0 (like a cached value but only before the cursor.) |
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It decreases an internal index until a next command-line history value |
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matches to an initial query text and points to the matched next |
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command-line history value. |
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This behaviour is to mimic a Vim's builtin command-line history |
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behaviour. |
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Returns: |
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str: A matched next command-line history value of input. |
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""" |
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if self._index == 0: |
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return self._cached |
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index = _index = self._index + 1 |
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while _index > self._index: |
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_index = self._index |
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candidate = self.next() |
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if candidate.startswith(self._backward): |
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return candidate |
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self._index = index |
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return self.next() |
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lambdalisue /
neovim-prompt
