有什么方法可以替换IPython Vi模式中存在的默认键绑定吗? [英] Is there any way to replace the exists default key bindings in IPython Vi mode?

问题描述

我正在使用IPython Vi模式，并且IPython设置了许多默认键映射此处和此处，发现我可以创建新的使用KeyBindingManager进行键绑定.

I am using IPython Vi mode, and IPython sets lots of default key mappings here. I did a research here and here, finding that I can create new key bindings by using KeyBindingManager.

但是，如果我要创建的绑定存在，那么它将无法正常工作.例如，我在~/.ipython/profile_default/startup/vikeys.py中编写一些代码:

However, if the binding I want to create exists, then it cannot works. For example, I write some code in ~/.ipython/profile_default/startup/vikeys.py:

from prompt_toolkit.filters.cli import ViNavigationMode, ViMode
from prompt_toolkit.filters import Always, IsReadOnly

# create `handle`
from IPython import get_ipython
ip = get_ipython()
if getattr(ip, 'pt_cli'):
    registry = ip.pt_cli.application.key_bindings_registry
    handle = registry.add_binding

navigation_mode = ViNavigationMode() & ViMode() & Always()

@handle('t', filter=navigation_mode)
def _(event):
    """
    Go up, but if we enter a new history entry, move to the start of the
    line.
    """
    event.current_buffer.auto_up(
        count=event.arg, go_to_start_of_line_if_history_changes=True)

由于t被映射

Since the t is mapped here, my binding doesn't work.

我还尝试用下面的代码替换handle，但没有效果:

I also tried to replace the handle with the code below, but there was no effects:

# create `handle`
from prompt_toolkit.key_binding.manager import KeyBindingManager
manager = KeyBindingManager.for_prompt()
handle = manager.registry.add_binding

那么，有什么方法可以替换IPython中现有的键绑定吗?

So, is there any way to replace the existing key bindings in IPython?

推荐答案

我自己回答问题，以帮助遇到相同问题的人.

Answer the question myself, to help those who meet to same problem.

阅读源代码后，我发现在handle上添加eager=True参数将覆盖默认的键绑定.

After reading the source code, I find that adding eager=True argument to the handle will override the default keybindings.

此处是为Dvorak用户替换默认导航键的示例.

Here is an example to replace default navigation keys for Dvorak user.

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