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"""Keymap.""" |
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import time |
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from datetime import datetime, timedelta |
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from typing import cast, Iterator, Optional, Sequence, Tuple, Union |
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from neovim import Nvim |
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from .key import Key, KeyCode |
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from .keystroke import Keystroke, KeystrokeExpr |
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from .util import getchar |
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Rule = Union[ |
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Tuple[KeystrokeExpr, KeystrokeExpr], |
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Tuple[KeystrokeExpr, KeystrokeExpr, bool], |
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] |
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class Keymap: |
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"""Keymap.""" |
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__slots__ = ('registry',) |
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def __init__(self) -> None: |
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"""Constructor.""" |
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self.registry = {} # type: Dict[Keystroke, tuple] |
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def register(self, |
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lhs: Keystroke, |
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rhs: Keystroke, |
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noremap: bool=False) -> None: |
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"""Register.""" |
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self.registry[lhs] = (lhs, rhs, noremap) |
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def register_from_rule(self, nvim: Nvim, rule: Rule) -> None: |
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"""Register.""" |
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if len(rule) == 2: |
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lhs, rhs = cast('Tuple[KeystrokeExpr, KeystrokeExpr]', rule) |
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noremap = False |
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else: |
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lhs, rhs, noremap = cast( |
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'Tuple[KeystrokeExpr, KeystrokeExpr, bool]', |
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rule |
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) |
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lhs = Keystroke.parse(nvim, lhs) |
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rhs = Keystroke.parse(nvim, rhs) |
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self.register(lhs, rhs, noremap) |
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def register_from_rules(self, |
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nvim: Nvim, |
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rules: Sequence[Rule]) -> None: |
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"""Register keymaps from rule tuple.""" |
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for rule in rules: |
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self.register_from_rule(nvim, rule) |
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def filter(self, lhs: Keystroke) -> Iterator[Keystroke]: |
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"""Filter.""" |
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candidates = ( |
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self.registry[k] |
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for k in self.registry.keys() if k.startswith(lhs) |
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) |
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return cast('Iterator[Keystroke]', sorted(candidates)) |
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def resolve(self, lhs: Keystroke, nowait: bool) -> Optional[Keystroke]: |
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"""Resolve.""" |
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candidates = list(self.filter(lhs)) |
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n = len(candidates) |
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if n == 0: |
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return lhs |
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elif n == 1: |
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_lhs, rhs, noremap = candidates[0] |
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if lhs == _lhs: |
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return rhs if noremap else self.resolve(rhs, nowait) |
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elif nowait: |
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_lhs, rhs, noremap = candidates[0] |
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if lhs == _lhs: |
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return rhs if noremap else self.resolve(rhs, nowait) |
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return None |
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def harvest(self, nvim: Nvim) -> Keystroke: |
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if nvim.options['timeout']: |
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timeoutlen = timedelta( |
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milliseconds=int(nvim.options['timeoutlen']) |
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) |
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else: |
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timeoutlen = None |
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previous = None |
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while True: |
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code = _getcode(nvim, datetime.now() + timeoutlen) |
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if code is None and previous is None: |
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continue |
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elif code is None: |
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return self.resolve(previous, nowait=True) or previous |
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previous = Keystroke((previous or ()) + (Key.parse(nvim, code),)) |
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keystroke = self.resolve(previous, nowait=False) |
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if keystroke: |
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return keystroke |
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@classmethod |
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def from_rules(cls, nvim: Nvim, rules: Sequence[Rule]) -> 'Keymap': |
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"""Create keymap from rule.""" |
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keymap = cls() |
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keymap.register_from_rules(nvim, rules) |
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return keymap |
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def _getcode(nvim: 'Nvim', timeout: Optional[datetime]) -> Optional[KeyCode]: |
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while not timeout or timeout > datetime.now(): |
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code = getchar(nvim, False) |
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if code != 0: |
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return code |
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time.sleep(0.01) |
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return None |
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DEFAULT_KEYMAP_RULES = ( |
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('<CR>', '<prompt:accept>', True), |
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('<ESC>', '<prompt:cancel>', True), |
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('<INSERT>', '<prompt:toggle_insert_mode>', True), |
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('<BS>', '<prompt:delete_char_before_caret>', True), |
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('<DEL>', '<prompt:delete_char_under_caret>', True), |
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('<C-U>', '<prompt:delete_entire_text>', True), |
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('<Left>', '<prompt:move_caret_to_left>', True), |
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('<Right>', '<prompt:move_caret_to_right>', True), |
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('<Home>', '<prompt:move_caret_to_head>', True), |
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('<End>', '<prompt:move_caret_to_tail>', True), |
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('<C-P>', '<prompt:assign_previous_text>', True), |
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('<C-N>', '<prompt:assign_next_text>', True), |
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('<Up>', '<prompt:assign_previous_matched_text>', True), |
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('<Down>', '<prompt:assign_next_matched_text>', True), |
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('<C-R>', '<prompt:paste_from_register>', True), |
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) |
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lambdalisue /
neovim-prompt
