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"""
Key bindings for extra page navigation: bindings for up/down scrolling through
long pages, like in Emacs or Vi.
"""
from __future__ import annotations
from prompt_toolkit.filters import buffer_has_focus, emacs_mode, vi_mode
from prompt_toolkit.key_binding.key_bindings import (
ConditionalKeyBindings,
KeyBindings,
KeyBindingsBase,
merge_key_bindings,
)
from .scroll import (
scroll_backward,
scroll_forward,
scroll_half_page_down,
scroll_half_page_up,
scroll_one_line_down,
scroll_one_line_up,
scroll_page_down,
scroll_page_up,
)
__all__ = [
"load_page_navigation_bindings",
"load_emacs_page_navigation_bindings",
"load_vi_page_navigation_bindings",
]
def load_page_navigation_bindings() -> KeyBindingsBase:
"""
Load both the Vi and Emacs bindings for page navigation.
"""
# Only enable when a `Buffer` is focused, otherwise, we would catch keys
# when another widget is focused (like for instance `c-d` in a
# ptterm.Terminal).
return ConditionalKeyBindings(
merge_key_bindings(
[
load_emacs_page_navigation_bindings(),
load_vi_page_navigation_bindings(),
]
),
buffer_has_focus,
)
def load_emacs_page_navigation_bindings() -> KeyBindingsBase:
"""
Key bindings, for scrolling up and down through pages.
This are separate bindings, because GNU readline doesn't have them.
"""
key_bindings = KeyBindings()
handle = key_bindings.add
handle("c-v")(scroll_page_down)
handle("pagedown")(scroll_page_down)
handle("escape", "v")(scroll_page_up)
handle("pageup")(scroll_page_up)
return ConditionalKeyBindings(key_bindings, emacs_mode)
def load_vi_page_navigation_bindings() -> KeyBindingsBase:
"""
Key bindings, for scrolling up and down through pages.
This are separate bindings, because GNU readline doesn't have them.
"""
key_bindings = KeyBindings()
handle = key_bindings.add
handle("c-f")(scroll_forward)
handle("c-b")(scroll_backward)
handle("c-d")(scroll_half_page_down)
handle("c-u")(scroll_half_page_up)
handle("c-e")(scroll_one_line_down)
handle("c-y")(scroll_one_line_up)
handle("pagedown")(scroll_page_down)
handle("pageup")(scroll_page_up)
return ConditionalKeyBindings(key_bindings, vi_mode)
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