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85 lines
2.3 KiB
Python
85 lines
2.3 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright: Ankitects Pty Ltd and contributors
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# License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
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"""\
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Hooks - hook management and tools for extending Anki
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==============================================================================
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To find available hooks, grep for runHook and runFilter in the source code.
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Instrumenting allows you to modify functions that don't have hooks available.
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If you call wrap() with pos='around', the original function will not be called
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automatically but can be called with _old().
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"""
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from typing import Any, Callable, Dict, List
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import decorator
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# Hooks
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##############################################################################
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_hooks: Dict[str, List[Callable[..., Any]]] = {}
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def runHook(hook: str, *args) -> None:
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"Run all functions on hook."
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hookFuncs = _hooks.get(hook, None)
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if hookFuncs:
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for func in hookFuncs:
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try:
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func(*args)
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except:
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hookFuncs.remove(func)
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raise
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def runFilter(hook: str, arg: Any, *args) -> Any:
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hookFuncs = _hooks.get(hook, None)
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if hookFuncs:
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for func in hookFuncs:
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try:
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arg = func(arg, *args)
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except:
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hookFuncs.remove(func)
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raise
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return arg
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def addHook(hook: str, func: Callable) -> None:
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"Add a function to hook. Ignore if already on hook."
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if not _hooks.get(hook, None):
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_hooks[hook] = []
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if func not in _hooks[hook]:
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_hooks[hook].append(func)
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def remHook(hook, func) -> None:
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"Remove a function if is on hook."
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hook = _hooks.get(hook, [])
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if func in hook:
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hook.remove(func)
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# Instrumenting
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##############################################################################
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def wrap(old, new, pos="after") -> Callable:
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"Override an existing function."
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def repl(*args, **kwargs):
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if pos == "after":
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old(*args, **kwargs)
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return new(*args, **kwargs)
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elif pos == "before":
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new(*args, **kwargs)
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return old(*args, **kwargs)
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else:
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return new(_old=old, *args, **kwargs)
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def decorator_wrapper(f, *args, **kwargs):
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return repl(*args, **kwargs)
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return decorator.decorator(decorator_wrapper)(old)
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