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