use editor::{movement, scroll::Autoscroll, DisplayPoint, Editor};use gpui::{actions, Action};use language::{CharClassifier, CharKind};use ui::ViewContext; use crate::{motion::Motion, state::Mode, Vim}; actions!(vim, [HelixNormalAfter, HelixDelete]); pub fn register(editor: &mut Editor, cx: &mut ViewContext<Vim>) {    Vim::action(editor, cx, Vim::helix_normal_after);    Vim::action(editor, cx, Vim::helix_delete);} impl Vim {    pub fn helix_normal_after(&mut self, action: &HelixNormalAfter, cx: &mut ViewContext<Self>) {        if self.active_operator().is_some() {            self.operator_stack.clear();            self.sync_vim_settings(cx);            return;        }        self.stop_recording_immediately(action.boxed_clone(), cx);        self.switch_mode(Mode::HelixNormal, false, cx);        return;    }     pub fn helix_normal_motion(        &mut self,        motion: Motion,        times: Option<usize>,        cx: &mut ViewContext<Self>,    ) {        self.helix_move_cursor(motion, times, cx);    }     fn helix_find_range_forward(        &mut self,        times: Option<usize>,        cx: &mut ViewContext<Self>,        mut is_boundary: impl FnMut(char, char, &CharClassifier) -> bool,    ) {        self.update_editor(cx, |_, editor, cx| {            editor.change_selections(Some(Autoscroll::fit()), cx, |s| {                s.move_with(|map, selection| {                    let times = times.unwrap_or(1);                     if selection.head() == map.max_point() {                        return;                    }                     // collapse to block cursor                    if selection.tail() < selection.head() {                        selection.set_tail(movement::left(map, selection.head()), selection.goal);                    } else {                        selection.set_tail(selection.head(), selection.goal);                        selection.set_head(movement::right(map, selection.head()), selection.goal);                    }                     // create a classifier                    let classifier = map                        .buffer_snapshot                        .char_classifier_at(selection.head().to_point(map));                     let mut last_selection = selection.clone();                    for _ in 0..times {                        let (new_tail, new_head) =                            movement::find_boundary_trail(map, selection.head(), |left, right| {                                is_boundary(left, right, &classifier)                            });                         selection.set_head(new_head, selection.goal);                        if let Some(new_tail) = new_tail {                            selection.set_tail(new_tail, selection.goal);                        }                         if selection.head() == last_selection.head()                            && selection.tail() == last_selection.tail()                        {                            break;                        }                        last_selection = selection.clone();                    }                });            });        });    }     fn helix_find_range_backward(        &mut self,        times: Option<usize>,        cx: &mut ViewContext<Self>,        mut is_boundary: impl FnMut(char, char, &CharClassifier) -> bool,    ) {        self.update_editor(cx, |_, editor, cx| {            editor.change_selections(Some(Autoscroll::fit()), cx, |s| {                s.move_with(|map, selection| {                    let times = times.unwrap_or(1);                     if selection.head() == DisplayPoint::zero() {                        return;                    }                     // collapse to block cursor                    if selection.tail() < selection.head() {                        selection.set_tail(movement::left(map, selection.head()), selection.goal);                    } else {                        selection.set_tail(selection.head(), selection.goal);                        selection.set_head(movement::right(map, selection.head()), selection.goal);                    }                     // flip the selection                    selection.swap_head_tail();                     // create a classifier                    let classifier = map                        .buffer_snapshot                        .char_classifier_at(selection.head().to_point(map));                     let mut last_selection = selection.clone();                    for _ in 0..times {                        let (new_tail, new_head) = movement::find_preceding_boundary_trail(                            map,                            selection.head(),                            |left, right| is_boundary(left, right, &classifier),                        );                         selection.set_head(new_head, selection.goal);                        if let Some(new_tail) = new_tail {                            selection.set_tail(new_tail, selection.goal);                        }                         if selection.head() == last_selection.head()                            && selection.tail() == last_selection.tail()                        {                            break;                        }                        last_selection = selection.clone();                    }                });            })        });    }     pub fn helix_move_and_collapse(        &mut self,        motion: Motion,        times: Option<usize>,        cx: &mut ViewContext<Self>,    ) {        self.update_editor(cx, |_, editor, cx| {            let text_layout_details = editor.text_layout_details(cx);            editor.change_selections(Some(Autoscroll::fit()), cx, |s| {                s.move_with(|map, selection| {                    let goal = selection.goal;                    let cursor = if selection.is_empty() || selection.reversed {                        selection.head()                    } else {                        movement::left(map, selection.head())                    };                     let (point, goal) = motion                        .move_point(map, cursor, selection.goal, times, &text_layout_details)                        .unwrap_or((cursor, goal));                     selection.collapse_to(point, goal)                })            });        });    }     pub fn helix_move_cursor(        &mut self,        motion: Motion,        times: Option<usize>,        cx: &mut ViewContext<Self>,    ) {        match motion {            Motion::NextWordStart { ignore_punctuation } => {                self.helix_find_range_forward(times, cx, |left, right, classifier| {                    let left_kind = classifier.kind_with(left, ignore_punctuation);                    let right_kind = classifier.kind_with(right, ignore_punctuation);                    let at_newline = right == '\n';                     let found =                        left_kind != right_kind && right_kind != CharKind::Whitespace || at_newline;                     found                })            }            Motion::NextWordEnd { ignore_punctuation } => {                self.helix_find_range_forward(times, cx, |left, right, classifier| {                    let left_kind = classifier.kind_with(left, ignore_punctuation);                    let right_kind = classifier.kind_with(right, ignore_punctuation);                    let at_newline = right == '\n';                     let found = left_kind != right_kind                        && (left_kind != CharKind::Whitespace || at_newline);                     found                })            }            Motion::PreviousWordStart { ignore_punctuation } => {                self.helix_find_range_backward(times, cx, |left, right, classifier| {                    let left_kind = classifier.kind_with(left, ignore_punctuation);                    let right_kind = classifier.kind_with(right, ignore_punctuation);                    let at_newline = right == '\n';                     let found = left_kind != right_kind                        && (left_kind != CharKind::Whitespace || at_newline);                     found                })            }            Motion::PreviousWordEnd { ignore_punctuation } => {                self.helix_find_range_backward(times, cx, |left, right, classifier| {                    let left_kind = classifier.kind_with(left, ignore_punctuation);                    let right_kind = classifier.kind_with(right, ignore_punctuation);                    let at_newline = right == '\n';                     let found = left_kind != right_kind                        && right_kind != CharKind::Whitespace                        && !at_newline;                     found                })            }            _ => self.helix_move_and_collapse(motion, times, cx),        }    }     pub fn helix_delete(&mut self, _: &HelixDelete, cx: &mut ViewContext<Self>) {        self.store_visual_marks(cx);        self.update_editor(cx, |vim, editor, cx| {            // Fixup selections so they have helix's semantics.            // Specifically:            //  - Make sure that each cursor acts as a 1 character wide selection            editor.transact(cx, |editor, cx| {                editor.change_selections(Some(Autoscroll::fit()), cx, |s| {                    s.move_with(|map, selection| {                        if selection.is_empty() && !selection.reversed {                            selection.end = movement::right(map, selection.end);                        }                    });                });            });             vim.copy_selections_content(editor, false, cx);            editor.insert("", cx);        });    }} #[cfg(test)]mod test {    use indoc::indoc;     use crate::{state::Mode, test::VimTestContext};     #[gpui::test]    async fn test_next_word_start(cx: &mut gpui::TestAppContext) {        let mut cx = VimTestContext::new(cx, true).await;        // «        // ˇ        // »        cx.set_state(            indoc! {"            The quˇick brown            fox jumps over            the lazy dog."},            Mode::HelixNormal,        );         cx.simulate_keystrokes("w");         cx.assert_state(            indoc! {"            The qu«ick ˇ»brown            fox jumps over            the lazy dog."},            Mode::HelixNormal,        );         cx.simulate_keystrokes("w");         cx.assert_state(            indoc! {"            The quick «brownˇ»            fox jumps over            the lazy dog."},            Mode::HelixNormal,        );    }     #[gpui::test]    async fn test_delete(cx: &mut gpui::TestAppContext) {        let mut cx = VimTestContext::new(cx, true).await;         // test delete a selection        cx.set_state(            indoc! {"            The qu«ick ˇ»brown            fox jumps over            the lazy dog."},            Mode::HelixNormal,        );         cx.simulate_keystrokes("d");         cx.assert_state(            indoc! {"            The quˇbrown            fox jumps over            the lazy dog."},            Mode::HelixNormal,        );         // test deleting a single character        cx.simulate_keystrokes("d");         cx.assert_state(            indoc! {"            The quˇrown            fox jumps over            the lazy dog."},            Mode::HelixNormal,        );    }     #[gpui::test]    async fn test_delete_character_end_of_line(cx: &mut gpui::TestAppContext) {        let mut cx = VimTestContext::new(cx, true).await;         cx.set_state(            indoc! {"            The quick brownˇ            fox jumps over            the lazy dog."},            Mode::HelixNormal,        );         cx.simulate_keystrokes("d");         cx.assert_state(            indoc! {"            The quick brownˇfox jumps over            the lazy dog."},            Mode::HelixNormal,        );    }     #[gpui::test]    async fn test_delete_character_end_of_buffer(cx: &mut gpui::TestAppContext) {        let mut cx = VimTestContext::new(cx, true).await;         cx.set_state(            indoc! {"            The quick brown            fox jumps over            the lazy dog.ˇ"},            Mode::HelixNormal,        );         cx.simulate_keystrokes("d");         cx.assert_state(            indoc! {"            The quick brown            fox jumps over            the lazy dog.ˇ"},            Mode::HelixNormal,        );    }}