use std::cmp::Ordering; use crate::Vim;use editor::{display_map::ToDisplayPoint, scroll::scroll_amount::ScrollAmount, Editor};use gpui::{actions, AppContext, ViewContext};use language::Bias;use workspace::Workspace; actions!(    vim,    [LineUp, LineDown, ScrollUp, ScrollDown, PageUp, PageDown,]); pub fn init(cx: &mut AppContext) {    cx.add_action(|_: &mut Workspace, _: &LineDown, cx| {        scroll(cx, |c| ScrollAmount::Line(c.unwrap_or(1.)))    });    cx.add_action(|_: &mut Workspace, _: &LineUp, cx| {        scroll(cx, |c| ScrollAmount::Line(-c.unwrap_or(1.)))    });    cx.add_action(|_: &mut Workspace, _: &PageDown, cx| {        scroll(cx, |c| ScrollAmount::Page(c.unwrap_or(1.)))    });    cx.add_action(|_: &mut Workspace, _: &PageUp, cx| {        scroll(cx, |c| ScrollAmount::Page(-c.unwrap_or(1.)))    });    cx.add_action(|_: &mut Workspace, _: &ScrollDown, cx| {        scroll(cx, |c| {            if let Some(c) = c {                ScrollAmount::Line(c)            } else {                ScrollAmount::Page(0.5)            }        })    });    cx.add_action(|_: &mut Workspace, _: &ScrollUp, cx| {        scroll(cx, |c| {            if let Some(c) = c {                ScrollAmount::Line(-c)            } else {                ScrollAmount::Page(-0.5)            }        })    });} fn scroll(cx: &mut ViewContext<Workspace>, by: fn(c: Option<f32>) -> ScrollAmount) {    Vim::update(cx, |vim, cx| {        let amount = by(vim.pop_number_operator(cx).map(|c| c as f32));        vim.update_active_editor(cx, |editor, cx| scroll_editor(editor, &amount, cx));    })} fn scroll_editor(editor: &mut Editor, amount: &ScrollAmount, cx: &mut ViewContext<Editor>) {    let should_move_cursor = editor.newest_selection_on_screen(cx).is_eq();    editor.scroll_screen(amount, cx);    if should_move_cursor {        let selection_ordering = editor.newest_selection_on_screen(cx);        if selection_ordering.is_eq() {            return;        }         let visible_rows = if let Some(visible_rows) = editor.visible_line_count() {            visible_rows as u32        } else {            return;        };         let top_anchor = editor.scroll_manager.anchor().anchor;         editor.change_selections(None, cx, |s| {            s.replace_cursors_with(|snapshot| {                let mut new_point = top_anchor.to_display_point(&snapshot);                 match selection_ordering {                    Ordering::Less => {                        new_point = snapshot.clip_point(new_point, Bias::Right);                    }                    Ordering::Greater => {                        *new_point.row_mut() += visible_rows - 1;                        new_point = snapshot.clip_point(new_point, Bias::Left);                    }                    Ordering::Equal => unreachable!(),                }                 vec![new_point]            })        });    }} #[cfg(test)]mod test {    use crate::{state::Mode, test::VimTestContext};    use gpui::geometry::vector::vec2f;    use indoc::indoc;     #[gpui::test]    async fn test_scroll(cx: &mut gpui::TestAppContext) {        let mut cx = VimTestContext::new(cx, true).await;         cx.set_state(indoc! {"ˇa\nb\nc\nd\ne\n"}, Mode::Normal);         cx.update_editor(|editor, cx| {            assert_eq!(editor.snapshot(cx).scroll_position(), vec2f(0., 0.))        });        cx.simulate_keystrokes(["ctrl-e"]);        cx.update_editor(|editor, cx| {            assert_eq!(editor.snapshot(cx).scroll_position(), vec2f(0., 1.))        });        cx.simulate_keystrokes(["2", "ctrl-e"]);        cx.update_editor(|editor, cx| {            assert_eq!(editor.snapshot(cx).scroll_position(), vec2f(0., 3.))        });        cx.simulate_keystrokes(["ctrl-y"]);        cx.update_editor(|editor, cx| {            assert_eq!(editor.snapshot(cx).scroll_position(), vec2f(0., 2.))        });    }}