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#!/usr/bin/env python
"""
Example of adding a custom Vi operator and text object.
(Note that this API is not guaranteed to remain stable.)
"""
from prompt_toolkit import prompt
from prompt_toolkit.enums import EditingMode
from prompt_toolkit.key_binding import KeyBindings
from prompt_toolkit.key_binding.bindings.vi import (
TextObject,
create_operator_decorator,
create_text_object_decorator,
)
def main():
# We start with a `Registry` of default key bindings.
bindings = KeyBindings()
# Create the decorators to be used for registering text objects and
# operators in this registry.
operator = create_operator_decorator(bindings)
text_object = create_text_object_decorator(bindings)
# Create a custom operator.
@operator("R")
def _(event, text_object):
"Custom operator that reverses text."
buff = event.current_buffer
# Get relative start/end coordinates.
start, end = text_object.operator_range(buff.document)
start += buff.cursor_position
end += buff.cursor_position
text = buff.text[start:end]
text = "".join(reversed(text))
event.app.current_buffer.text = buff.text[:start] + text + buff.text[end:]
# Create a text object.
@text_object("A")
def _(event):
"A custom text object that involves everything."
# Note that a `TextObject` has coordinates, relative to the cursor position.
buff = event.current_buffer
return TextObject(
-buff.document.cursor_position, # The start.
len(buff.text) - buff.document.cursor_position,
) # The end.
# Read input.
print('There is a custom text object "A" that applies to everything')
print('and a custom operator "r" that reverses the text object.\n')
print("Things that are possible:")
print("- Riw - reverse inner word.")
print("- yA - yank everything.")
print("- RA - reverse everything.")
text = prompt(
"> ", default="hello world", key_bindings=bindings, editing_mode=EditingMode.VI
)
print("You said: %s" % text)
if __name__ == "__main__":
main()
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