diff options
author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-15 16:35:31 +0000 |
---|---|---|
committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-15 16:35:31 +0000 |
commit | 4f1a3b5f9ad05aa7b08715d48909a2b06ee2fcb1 (patch) | |
tree | e5dee7be2f0d963da4faad6517278d03783e3adc /src/prompt_toolkit/key_binding/bindings/emacs.py | |
parent | Initial commit. (diff) | |
download | prompt-toolkit-7636d8a881b219a91fe81306e0a97e2eb8be010b.tar.xz prompt-toolkit-7636d8a881b219a91fe81306e0a97e2eb8be010b.zip |
Adding upstream version 3.0.43.upstream/3.0.43
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/prompt_toolkit/key_binding/bindings/emacs.py')
-rw-r--r-- | src/prompt_toolkit/key_binding/bindings/emacs.py | 557 |
1 files changed, 557 insertions, 0 deletions
diff --git a/src/prompt_toolkit/key_binding/bindings/emacs.py b/src/prompt_toolkit/key_binding/bindings/emacs.py new file mode 100644 index 0000000..80a66fd --- /dev/null +++ b/src/prompt_toolkit/key_binding/bindings/emacs.py @@ -0,0 +1,557 @@ +# pylint: disable=function-redefined +from __future__ import annotations + +from prompt_toolkit.application.current import get_app +from prompt_toolkit.buffer import Buffer, indent, unindent +from prompt_toolkit.completion import CompleteEvent +from prompt_toolkit.filters import ( + Condition, + emacs_insert_mode, + emacs_mode, + has_arg, + has_selection, + in_paste_mode, + is_multiline, + is_read_only, + shift_selection_mode, + vi_search_direction_reversed, +) +from prompt_toolkit.key_binding.key_bindings import Binding +from prompt_toolkit.key_binding.key_processor import KeyPressEvent +from prompt_toolkit.keys import Keys +from prompt_toolkit.selection import SelectionType + +from ..key_bindings import ConditionalKeyBindings, KeyBindings, KeyBindingsBase +from .named_commands import get_by_name + +__all__ = [ + "load_emacs_bindings", + "load_emacs_search_bindings", + "load_emacs_shift_selection_bindings", +] + +E = KeyPressEvent + + +def load_emacs_bindings() -> KeyBindingsBase: + """ + Some e-macs extensions. + """ + # Overview of Readline emacs commands: + # http://www.catonmat.net/download/readline-emacs-editing-mode-cheat-sheet.pdf + key_bindings = KeyBindings() + handle = key_bindings.add + + insert_mode = emacs_insert_mode + + @handle("escape") + def _esc(event: E) -> None: + """ + By default, ignore escape key. + + (If we don't put this here, and Esc is followed by a key which sequence + is not handled, we'll insert an Escape character in the input stream. + Something we don't want and happens to easily in emacs mode. + Further, people can always use ControlQ to do a quoted insert.) + """ + pass + + handle("c-a")(get_by_name("beginning-of-line")) + handle("c-b")(get_by_name("backward-char")) + handle("c-delete", filter=insert_mode)(get_by_name("kill-word")) + handle("c-e")(get_by_name("end-of-line")) + handle("c-f")(get_by_name("forward-char")) + handle("c-left")(get_by_name("backward-word")) + handle("c-right")(get_by_name("forward-word")) + handle("c-x", "r", "y", filter=insert_mode)(get_by_name("yank")) + handle("c-y", filter=insert_mode)(get_by_name("yank")) + handle("escape", "b")(get_by_name("backward-word")) + handle("escape", "c", filter=insert_mode)(get_by_name("capitalize-word")) + handle("escape", "d", filter=insert_mode)(get_by_name("kill-word")) + handle("escape", "f")(get_by_name("forward-word")) + handle("escape", "l", filter=insert_mode)(get_by_name("downcase-word")) + handle("escape", "u", filter=insert_mode)(get_by_name("uppercase-word")) + handle("escape", "y", filter=insert_mode)(get_by_name("yank-pop")) + handle("escape", "backspace", filter=insert_mode)(get_by_name("backward-kill-word")) + handle("escape", "\\", filter=insert_mode)(get_by_name("delete-horizontal-space")) + + handle("c-home")(get_by_name("beginning-of-buffer")) + handle("c-end")(get_by_name("end-of-buffer")) + + handle("c-_", save_before=(lambda e: False), filter=insert_mode)( + get_by_name("undo") + ) + + handle("c-x", "c-u", save_before=(lambda e: False), filter=insert_mode)( + get_by_name("undo") + ) + + handle("escape", "<", filter=~has_selection)(get_by_name("beginning-of-history")) + handle("escape", ">", filter=~has_selection)(get_by_name("end-of-history")) + + handle("escape", ".", filter=insert_mode)(get_by_name("yank-last-arg")) + handle("escape", "_", filter=insert_mode)(get_by_name("yank-last-arg")) + handle("escape", "c-y", filter=insert_mode)(get_by_name("yank-nth-arg")) + handle("escape", "#", filter=insert_mode)(get_by_name("insert-comment")) + handle("c-o")(get_by_name("operate-and-get-next")) + + # ControlQ does a quoted insert. Not that for vt100 terminals, you have to + # disable flow control by running ``stty -ixon``, otherwise Ctrl-Q and + # Ctrl-S are captured by the terminal. + handle("c-q", filter=~has_selection)(get_by_name("quoted-insert")) + + handle("c-x", "(")(get_by_name("start-kbd-macro")) + handle("c-x", ")")(get_by_name("end-kbd-macro")) + handle("c-x", "e")(get_by_name("call-last-kbd-macro")) + + @handle("c-n") + def _next(event: E) -> None: + "Next line." + event.current_buffer.auto_down() + + @handle("c-p") + def _prev(event: E) -> None: + "Previous line." + event.current_buffer.auto_up(count=event.arg) + + def handle_digit(c: str) -> None: + """ + Handle input of arguments. + The first number needs to be preceded by escape. + """ + + @handle(c, filter=has_arg) + @handle("escape", c) + def _(event: E) -> None: + event.append_to_arg_count(c) + + for c in "0123456789": + handle_digit(c) + + @handle("escape", "-", filter=~has_arg) + def _meta_dash(event: E) -> None: + """""" + if event._arg is None: + event.append_to_arg_count("-") + + @handle("-", filter=Condition(lambda: get_app().key_processor.arg == "-")) + def _dash(event: E) -> None: + """ + When '-' is typed again, after exactly '-' has been given as an + argument, ignore this. + """ + event.app.key_processor.arg = "-" + + @Condition + def is_returnable() -> bool: + return get_app().current_buffer.is_returnable + + # Meta + Enter: always accept input. + handle("escape", "enter", filter=insert_mode & is_returnable)( + get_by_name("accept-line") + ) + + # Enter: accept input in single line mode. + handle("enter", filter=insert_mode & is_returnable & ~is_multiline)( + get_by_name("accept-line") + ) + + def character_search(buff: Buffer, char: str, count: int) -> None: + if count < 0: + match = buff.document.find_backwards( + char, in_current_line=True, count=-count + ) + else: + match = buff.document.find(char, in_current_line=True, count=count) + + if match is not None: + buff.cursor_position += match + + @handle("c-]", Keys.Any) + def _goto_char(event: E) -> None: + "When Ctl-] + a character is pressed. go to that character." + # Also named 'character-search' + character_search(event.current_buffer, event.data, event.arg) + + @handle("escape", "c-]", Keys.Any) + def _goto_char_backwards(event: E) -> None: + "Like Ctl-], but backwards." + # Also named 'character-search-backward' + character_search(event.current_buffer, event.data, -event.arg) + + @handle("escape", "a") + def _prev_sentence(event: E) -> None: + "Previous sentence." + # TODO: + + @handle("escape", "e") + def _end_of_sentence(event: E) -> None: + "Move to end of sentence." + # TODO: + + @handle("escape", "t", filter=insert_mode) + def _swap_characters(event: E) -> None: + """ + Swap the last two words before the cursor. + """ + # TODO + + @handle("escape", "*", filter=insert_mode) + def _insert_all_completions(event: E) -> None: + """ + `meta-*`: Insert all possible completions of the preceding text. + """ + buff = event.current_buffer + + # List all completions. + complete_event = CompleteEvent(text_inserted=False, completion_requested=True) + completions = list( + buff.completer.get_completions(buff.document, complete_event) + ) + + # Insert them. + text_to_insert = " ".join(c.text for c in completions) + buff.insert_text(text_to_insert) + + @handle("c-x", "c-x") + def _toggle_start_end(event: E) -> None: + """ + Move cursor back and forth between the start and end of the current + line. + """ + buffer = event.current_buffer + + if buffer.document.is_cursor_at_the_end_of_line: + buffer.cursor_position += buffer.document.get_start_of_line_position( + after_whitespace=False + ) + else: + buffer.cursor_position += buffer.document.get_end_of_line_position() + + @handle("c-@") # Control-space or Control-@ + def _start_selection(event: E) -> None: + """ + Start of the selection (if the current buffer is not empty). + """ + # Take the current cursor position as the start of this selection. + buff = event.current_buffer + if buff.text: + buff.start_selection(selection_type=SelectionType.CHARACTERS) + + @handle("c-g", filter=~has_selection) + def _cancel(event: E) -> None: + """ + Control + G: Cancel completion menu and validation state. + """ + event.current_buffer.complete_state = None + event.current_buffer.validation_error = None + + @handle("c-g", filter=has_selection) + def _cancel_selection(event: E) -> None: + """ + Cancel selection. + """ + event.current_buffer.exit_selection() + + @handle("c-w", filter=has_selection) + @handle("c-x", "r", "k", filter=has_selection) + def _cut(event: E) -> None: + """ + Cut selected text. + """ + data = event.current_buffer.cut_selection() + event.app.clipboard.set_data(data) + + @handle("escape", "w", filter=has_selection) + def _copy(event: E) -> None: + """ + Copy selected text. + """ + data = event.current_buffer.copy_selection() + event.app.clipboard.set_data(data) + + @handle("escape", "left") + def _start_of_word(event: E) -> None: + """ + Cursor to start of previous word. + """ + buffer = event.current_buffer + buffer.cursor_position += ( + buffer.document.find_previous_word_beginning(count=event.arg) or 0 + ) + + @handle("escape", "right") + def _start_next_word(event: E) -> None: + """ + Cursor to start of next word. + """ + buffer = event.current_buffer + buffer.cursor_position += ( + buffer.document.find_next_word_beginning(count=event.arg) + or buffer.document.get_end_of_document_position() + ) + + @handle("escape", "/", filter=insert_mode) + def _complete(event: E) -> None: + """ + M-/: Complete. + """ + b = event.current_buffer + if b.complete_state: + b.complete_next() + else: + b.start_completion(select_first=True) + + @handle("c-c", ">", filter=has_selection) + def _indent(event: E) -> None: + """ + Indent selected text. + """ + buffer = event.current_buffer + + buffer.cursor_position += buffer.document.get_start_of_line_position( + after_whitespace=True + ) + + from_, to = buffer.document.selection_range() + from_, _ = buffer.document.translate_index_to_position(from_) + to, _ = buffer.document.translate_index_to_position(to) + + indent(buffer, from_, to + 1, count=event.arg) + + @handle("c-c", "<", filter=has_selection) + def _unindent(event: E) -> None: + """ + Unindent selected text. + """ + buffer = event.current_buffer + + from_, to = buffer.document.selection_range() + from_, _ = buffer.document.translate_index_to_position(from_) + to, _ = buffer.document.translate_index_to_position(to) + + unindent(buffer, from_, to + 1, count=event.arg) + + return ConditionalKeyBindings(key_bindings, emacs_mode) + + +def load_emacs_search_bindings() -> KeyBindingsBase: + key_bindings = KeyBindings() + handle = key_bindings.add + from . import search + + # NOTE: We don't bind 'Escape' to 'abort_search'. The reason is that we + # want Alt+Enter to accept input directly in incremental search mode. + # Instead, we have double escape. + + handle("c-r")(search.start_reverse_incremental_search) + handle("c-s")(search.start_forward_incremental_search) + + handle("c-c")(search.abort_search) + handle("c-g")(search.abort_search) + handle("c-r")(search.reverse_incremental_search) + handle("c-s")(search.forward_incremental_search) + handle("up")(search.reverse_incremental_search) + handle("down")(search.forward_incremental_search) + handle("enter")(search.accept_search) + + # Handling of escape. + handle("escape", eager=True)(search.accept_search) + + # Like Readline, it's more natural to accept the search when escape has + # been pressed, however instead the following two bindings could be used + # instead. + # #handle('escape', 'escape', eager=True)(search.abort_search) + # #handle('escape', 'enter', eager=True)(search.accept_search_and_accept_input) + + # If Read-only: also include the following key bindings: + + # '/' and '?' key bindings for searching, just like Vi mode. + handle("?", filter=is_read_only & ~vi_search_direction_reversed)( + search.start_reverse_incremental_search + ) + handle("/", filter=is_read_only & ~vi_search_direction_reversed)( + search.start_forward_incremental_search + ) + handle("?", filter=is_read_only & vi_search_direction_reversed)( + search.start_forward_incremental_search + ) + handle("/", filter=is_read_only & vi_search_direction_reversed)( + search.start_reverse_incremental_search + ) + + @handle("n", filter=is_read_only) + def _jump_next(event: E) -> None: + "Jump to next match." + event.current_buffer.apply_search( + event.app.current_search_state, + include_current_position=False, + count=event.arg, + ) + + @handle("N", filter=is_read_only) + def _jump_prev(event: E) -> None: + "Jump to previous match." + event.current_buffer.apply_search( + ~event.app.current_search_state, + include_current_position=False, + count=event.arg, + ) + + return ConditionalKeyBindings(key_bindings, emacs_mode) + + +def load_emacs_shift_selection_bindings() -> KeyBindingsBase: + """ + Bindings to select text with shift + cursor movements + """ + + key_bindings = KeyBindings() + handle = key_bindings.add + + def unshift_move(event: E) -> None: + """ + Used for the shift selection mode. When called with + a shift + movement key press event, moves the cursor + as if shift is not pressed. + """ + key = event.key_sequence[0].key + + if key == Keys.ShiftUp: + event.current_buffer.auto_up(count=event.arg) + return + if key == Keys.ShiftDown: + event.current_buffer.auto_down(count=event.arg) + return + + # the other keys are handled through their readline command + key_to_command: dict[Keys | str, str] = { + Keys.ShiftLeft: "backward-char", + Keys.ShiftRight: "forward-char", + Keys.ShiftHome: "beginning-of-line", + Keys.ShiftEnd: "end-of-line", + Keys.ControlShiftLeft: "backward-word", + Keys.ControlShiftRight: "forward-word", + Keys.ControlShiftHome: "beginning-of-buffer", + Keys.ControlShiftEnd: "end-of-buffer", + } + + try: + # Both the dict lookup and `get_by_name` can raise KeyError. + binding = get_by_name(key_to_command[key]) + except KeyError: + pass + else: # (`else` is not really needed here.) + if isinstance(binding, Binding): + # (It should always be a binding here) + binding.call(event) + + @handle("s-left", filter=~has_selection) + @handle("s-right", filter=~has_selection) + @handle("s-up", filter=~has_selection) + @handle("s-down", filter=~has_selection) + @handle("s-home", filter=~has_selection) + @handle("s-end", filter=~has_selection) + @handle("c-s-left", filter=~has_selection) + @handle("c-s-right", filter=~has_selection) + @handle("c-s-home", filter=~has_selection) + @handle("c-s-end", filter=~has_selection) + def _start_selection(event: E) -> None: + """ + Start selection with shift + movement. + """ + # Take the current cursor position as the start of this selection. + buff = event.current_buffer + if buff.text: + buff.start_selection(selection_type=SelectionType.CHARACTERS) + + if buff.selection_state is not None: + # (`selection_state` should never be `None`, it is created by + # `start_selection`.) + buff.selection_state.enter_shift_mode() + + # Then move the cursor + original_position = buff.cursor_position + unshift_move(event) + if buff.cursor_position == original_position: + # Cursor didn't actually move - so cancel selection + # to avoid having an empty selection + buff.exit_selection() + + @handle("s-left", filter=shift_selection_mode) + @handle("s-right", filter=shift_selection_mode) + @handle("s-up", filter=shift_selection_mode) + @handle("s-down", filter=shift_selection_mode) + @handle("s-home", filter=shift_selection_mode) + @handle("s-end", filter=shift_selection_mode) + @handle("c-s-left", filter=shift_selection_mode) + @handle("c-s-right", filter=shift_selection_mode) + @handle("c-s-home", filter=shift_selection_mode) + @handle("c-s-end", filter=shift_selection_mode) + def _extend_selection(event: E) -> None: + """ + Extend the selection + """ + # Just move the cursor, like shift was not pressed + unshift_move(event) + buff = event.current_buffer + + if buff.selection_state is not None: + if buff.cursor_position == buff.selection_state.original_cursor_position: + # selection is now empty, so cancel selection + buff.exit_selection() + + @handle(Keys.Any, filter=shift_selection_mode) + def _replace_selection(event: E) -> None: + """ + Replace selection by what is typed + """ + event.current_buffer.cut_selection() + get_by_name("self-insert").call(event) + + @handle("enter", filter=shift_selection_mode & is_multiline) + def _newline(event: E) -> None: + """ + A newline replaces the selection + """ + event.current_buffer.cut_selection() + event.current_buffer.newline(copy_margin=not in_paste_mode()) + + @handle("backspace", filter=shift_selection_mode) + def _delete(event: E) -> None: + """ + Delete selection. + """ + event.current_buffer.cut_selection() + + @handle("c-y", filter=shift_selection_mode) + def _yank(event: E) -> None: + """ + In shift selection mode, yanking (pasting) replace the selection. + """ + buff = event.current_buffer + if buff.selection_state: + buff.cut_selection() + get_by_name("yank").call(event) + + # moving the cursor in shift selection mode cancels the selection + @handle("left", filter=shift_selection_mode) + @handle("right", filter=shift_selection_mode) + @handle("up", filter=shift_selection_mode) + @handle("down", filter=shift_selection_mode) + @handle("home", filter=shift_selection_mode) + @handle("end", filter=shift_selection_mode) + @handle("c-left", filter=shift_selection_mode) + @handle("c-right", filter=shift_selection_mode) + @handle("c-home", filter=shift_selection_mode) + @handle("c-end", filter=shift_selection_mode) + def _cancel(event: E) -> None: + """ + Cancel selection. + """ + event.current_buffer.exit_selection() + # we then process the cursor movement + key_press = event.key_sequence[0] + event.key_processor.feed(key_press, first=True) + + return ConditionalKeyBindings(key_bindings, emacs_mode) |