//! Vim support for Zed. #[cfg(test)]mod test; mod command;mod editor_events;mod insert;mod mode_indicator;mod motion;mod normal;mod object;mod state;mod utils;mod visual; use anyhow::Result;use collections::HashMap;use command_palette::CommandPaletteInterceptor;use copilot::CommandPaletteFilter;use editor::{movement, Editor, EditorEvent, EditorMode};use gpui::{    actions, impl_actions, Action, AppContext, EntityId, Global, Subscription, View, ViewContext,    WeakView, WindowContext,};use language::{CursorShape, Point, Selection, SelectionGoal};pub use mode_indicator::ModeIndicator;use motion::Motion;use normal::normal_replace;use serde::Deserialize;use settings::{update_settings_file, Settings, SettingsStore};use state::{EditorState, Mode, Operator, RecordedSelection, WorkspaceState};use std::{ops::Range, sync::Arc};use visual::{visual_block_motion, visual_replace};use workspace::{self, Workspace}; use crate::state::ReplayableAction; /// Whether or not to enable Vim mode (work in progress).////// Default: falsepub struct VimModeSetting(pub bool); /// An Action to Switch between modes#[derive(Clone, Deserialize, PartialEq)]pub struct SwitchMode(pub Mode); /// PushOperator is used to put vim into a "minor" mode,/// where it's waiting for a specific next set of keystrokes./// For example 'd' needs a motion to complete.#[derive(Clone, Deserialize, PartialEq)]pub struct PushOperator(pub Operator); /// Number is used to manage vim's count. Pushing a digit/// multiplis the current value by 10 and adds the digit.#[derive(Clone, Deserialize, PartialEq)]struct Number(usize); actions!(    vim,    [Tab, Enter, Object, InnerObject, FindForward, FindBackward]); // in the workspace namespace so it's not filtered out when vim is disabled.actions!(workspace, [ToggleVimMode]); impl_actions!(vim, [SwitchMode, PushOperator, Number]); /// Initializes the `vim` crate.pub fn init(cx: &mut AppContext) {    cx.set_global(Vim::default());    VimModeSetting::register(cx);     editor_events::init(cx);     cx.observe_new_views(|workspace: &mut Workspace, cx| register(workspace, cx))        .detach();     // Any time settings change, update vim mode to match. The Vim struct    // will be initialized as disabled by default, so we filter its commands    // out when starting up.    cx.update_global::<CommandPaletteFilter, _>(|filter, _| {        filter.hidden_namespaces.insert("vim");    });    cx.update_global(|vim: &mut Vim, cx: &mut AppContext| {        vim.set_enabled(VimModeSetting::get_global(cx).0, cx)    });    cx.observe_global::<SettingsStore>(|cx| {        cx.update_global(|vim: &mut Vim, cx: &mut AppContext| {            vim.set_enabled(VimModeSetting::get_global(cx).0, cx)        });    })    .detach();} fn register(workspace: &mut Workspace, cx: &mut ViewContext<Workspace>) {    workspace.register_action(|_: &mut Workspace, &SwitchMode(mode): &SwitchMode, cx| {        Vim::update(cx, |vim, cx| vim.switch_mode(mode, false, cx))    });    workspace.register_action(        |_: &mut Workspace, &PushOperator(operator): &PushOperator, cx| {            Vim::update(cx, |vim, cx| vim.push_operator(operator, cx))        },    );    workspace.register_action(|_: &mut Workspace, n: &Number, cx: _| {        Vim::update(cx, |vim, cx| vim.push_count_digit(n.0, cx));    });     workspace.register_action(|_: &mut Workspace, _: &Tab, cx| {        Vim::active_editor_input_ignored(" ".into(), cx)    });     workspace.register_action(|_: &mut Workspace, _: &Enter, cx| {        Vim::active_editor_input_ignored("\n".into(), cx)    });     workspace.register_action(|workspace: &mut Workspace, _: &ToggleVimMode, cx| {        let fs = workspace.app_state().fs.clone();        let currently_enabled = VimModeSetting::get_global(cx).0;        update_settings_file::<VimModeSetting>(fs, cx, move |setting| {            *setting = Some(!currently_enabled)        })    });     normal::register(workspace, cx);    insert::register(workspace, cx);    motion::register(workspace, cx);    command::register(workspace, cx);    object::register(workspace, cx);    visual::register(workspace, cx);} /// Registers a keystroke observer to observe keystrokes for the Vim integration.pub fn observe_keystrokes(cx: &mut WindowContext) {    cx.observe_keystrokes(|keystroke_event, cx| {        if let Some(action) = keystroke_event            .action            .as_ref()            .map(|action| action.boxed_clone())        {            Vim::update(cx, |vim, _| {                if vim.workspace_state.recording {                    vim.workspace_state                        .recorded_actions                        .push(ReplayableAction::Action(action.boxed_clone()));                     if vim.workspace_state.stop_recording_after_next_action {                        vim.workspace_state.recording = false;                        vim.workspace_state.stop_recording_after_next_action = false;                    }                }            });             // Keystroke is handled by the vim system, so continue forward            if action.name().starts_with("vim::") {                return;            }        } else if cx.has_pending_keystrokes() {            return;        }         Vim::update(cx, |vim, cx| match vim.active_operator() {            Some(                Operator::FindForward { .. } | Operator::FindBackward { .. } | Operator::Replace,            ) => {}            Some(_) => {                vim.clear_operator(cx);            }            _ => {}        });    })    .detach()} /// The state pertaining to Vim mode.#[derive(Default)]struct Vim {    active_editor: Option<WeakView<Editor>>,    editor_subscription: Option<Subscription>,    enabled: bool,    editor_states: HashMap<EntityId, EditorState>,    workspace_state: WorkspaceState,    default_state: EditorState,} impl Global for Vim {} impl Vim {    fn read(cx: &mut AppContext) -> &Self {        cx.global::<Self>()    }     fn update<F, S>(cx: &mut WindowContext, update: F) -> S    where        F: FnOnce(&mut Self, &mut WindowContext) -> S,    {        cx.update_global(update)    }     fn activate_editor(&mut self, editor: View<Editor>, cx: &mut WindowContext) {        if !editor.read(cx).use_modal_editing() {            return;        }         self.active_editor = Some(editor.clone().downgrade());        self.editor_subscription = Some(cx.subscribe(&editor, |editor, event, cx| match event {            EditorEvent::SelectionsChanged { local: true } => {                let editor = editor.read(cx);                if editor.leader_peer_id().is_none() {                    let newest = editor.selections.newest::<usize>(cx);                    let is_multicursor = editor.selections.count() > 1;                    local_selections_changed(newest, is_multicursor, cx);                }            }            EditorEvent::InputIgnored { text } => {                Vim::active_editor_input_ignored(text.clone(), cx);                Vim::record_insertion(text, None, cx)            }            EditorEvent::InputHandled {                text,                utf16_range_to_replace: range_to_replace,            } => Vim::record_insertion(text, range_to_replace.clone(), cx),            _ => {}        }));         let editor = editor.read(cx);        let editor_mode = editor.mode();        let newest_selection_empty = editor.selections.newest::<usize>(cx).is_empty();         if editor_mode == EditorMode::Full                && !newest_selection_empty                && self.state().mode == Mode::Normal                // When following someone, don't switch vim mode.                && editor.leader_peer_id().is_none()        {            self.switch_mode(Mode::Visual, true, cx);        }         self.sync_vim_settings(cx);    }     fn record_insertion(        text: &Arc<str>,        range_to_replace: Option<Range<isize>>,        cx: &mut WindowContext,    ) {        Vim::update(cx, |vim, _| {            if vim.workspace_state.recording {                vim.workspace_state                    .recorded_actions                    .push(ReplayableAction::Insertion {                        text: text.clone(),                        utf16_range_to_replace: range_to_replace,                    });                if vim.workspace_state.stop_recording_after_next_action {                    vim.workspace_state.recording = false;                    vim.workspace_state.stop_recording_after_next_action = false;                }            }        });    }     fn update_active_editor<S>(        &self,        cx: &mut WindowContext,        update: impl FnOnce(&mut Editor, &mut ViewContext<Editor>) -> S,    ) -> Option<S> {        let editor = self.active_editor.clone()?.upgrade()?;        Some(editor.update(cx, update))    }     /// When doing an action that modifies the buffer, we start recording so that `.`    /// will replay the action.    pub fn start_recording(&mut self, cx: &mut WindowContext) {        if !self.workspace_state.replaying {            self.workspace_state.recording = true;            self.workspace_state.recorded_actions = Default::default();            self.workspace_state.recorded_count = None;             let selections = self                .active_editor                .as_ref()                .and_then(|editor| editor.upgrade())                .map(|editor| {                    let editor = editor.read(cx);                    (                        editor.selections.oldest::<Point>(cx),                        editor.selections.newest::<Point>(cx),                    )                });             if let Some((oldest, newest)) = selections {                self.workspace_state.recorded_selection = match self.state().mode {                    Mode::Visual if newest.end.row == newest.start.row => {                        RecordedSelection::SingleLine {                            cols: newest.end.column - newest.start.column,                        }                    }                    Mode::Visual => RecordedSelection::Visual {                        rows: newest.end.row - newest.start.row,                        cols: newest.end.column,                    },                    Mode::VisualLine => RecordedSelection::VisualLine {                        rows: newest.end.row - newest.start.row,                    },                    Mode::VisualBlock => RecordedSelection::VisualBlock {                        rows: newest.end.row.abs_diff(oldest.start.row),                        cols: newest.end.column.abs_diff(oldest.start.column),                    },                    _ => RecordedSelection::None,                }            } else {                self.workspace_state.recorded_selection = RecordedSelection::None;            }        }    }     /// When finishing an action that modifies the buffer, stop recording.    /// as you usually call this within a keystroke handler we also ensure that    /// the current action is recorded.    pub fn stop_recording(&mut self) {        if self.workspace_state.recording {            self.workspace_state.stop_recording_after_next_action = true;        }    }     /// Stops recording actions immediately rather than waiting until after the    /// next action to stop recording.    ///    /// This doesn't include the current action.    pub fn stop_recording_immediately(&mut self, action: Box<dyn Action>) {        if self.workspace_state.recording {            self.workspace_state                .recorded_actions                .push(ReplayableAction::Action(action.boxed_clone()));            self.workspace_state.recording = false;            self.workspace_state.stop_recording_after_next_action = false;        }    }     /// Explicitly record one action (equivalents to start_recording and stop_recording)    pub fn record_current_action(&mut self, cx: &mut WindowContext) {        self.start_recording(cx);        self.stop_recording();    }     fn switch_mode(&mut self, mode: Mode, leave_selections: bool, cx: &mut WindowContext) {        let state = self.state();        let last_mode = state.mode;        let prior_mode = state.last_mode;        self.update_state(|state| {            state.last_mode = last_mode;            state.mode = mode;            state.operator_stack.clear();        });        if mode != Mode::Insert {            self.take_count(cx);        }         // Sync editor settings like clip mode        self.sync_vim_settings(cx);         if leave_selections {            return;        }         // Adjust selections        self.update_active_editor(cx, |editor, cx| {            if last_mode != Mode::VisualBlock && last_mode.is_visual() && mode == Mode::VisualBlock            {                visual_block_motion(true, editor, cx, |_, point, goal| Some((point, goal)))            }             editor.change_selections(None, cx, |s| {                // we cheat with visual block mode and use multiple cursors.                // the cost of this cheat is we need to convert back to a single                // cursor whenever vim would.                if last_mode == Mode::VisualBlock                    && (mode != Mode::VisualBlock && mode != Mode::Insert)                {                    let tail = s.oldest_anchor().tail();                    let head = s.newest_anchor().head();                    s.select_anchor_ranges(vec![tail..head]);                } else if last_mode == Mode::Insert                    && prior_mode == Mode::VisualBlock                    && mode != Mode::VisualBlock                {                    let pos = s.first_anchor().head();                    s.select_anchor_ranges(vec![pos..pos])                }                 s.move_with(|map, selection| {                    if last_mode.is_visual() && !mode.is_visual() {                        let mut point = selection.head();                        if !selection.reversed && !selection.is_empty() {                            point = movement::left(map, selection.head());                        }                        selection.collapse_to(point, selection.goal)                    } else if !last_mode.is_visual() && mode.is_visual() {                        if selection.is_empty() {                            selection.end = movement::right(map, selection.start);                        }                    }                });            })        });    }     fn push_count_digit(&mut self, number: usize, cx: &mut WindowContext) {        if self.active_operator().is_some() {            self.update_state(|state| {                state.post_count = Some(state.post_count.unwrap_or(0) * 10 + number)            })        } else {            self.update_state(|state| {                state.pre_count = Some(state.pre_count.unwrap_or(0) * 10 + number)            })        }        // update the keymap so that 0 works        self.sync_vim_settings(cx)    }     fn take_count(&mut self, cx: &mut WindowContext) -> Option<usize> {        if self.workspace_state.replaying {            return self.workspace_state.recorded_count;        }         let count = if self.state().post_count == None && self.state().pre_count == None {            return None;        } else {            Some(self.update_state(|state| {                state.post_count.take().unwrap_or(1) * state.pre_count.take().unwrap_or(1)            }))        };        if self.workspace_state.recording {            self.workspace_state.recorded_count = count;        }        self.sync_vim_settings(cx);        count    }     fn push_operator(&mut self, operator: Operator, cx: &mut WindowContext) {        if matches!(            operator,            Operator::Change | Operator::Delete | Operator::Replace        ) {            self.start_recording(cx)        };        self.update_state(|state| state.operator_stack.push(operator));        self.sync_vim_settings(cx);    }     fn maybe_pop_operator(&mut self) -> Option<Operator> {        self.update_state(|state| state.operator_stack.pop())    }     fn pop_operator(&mut self, cx: &mut WindowContext) -> Operator {        let popped_operator = self.update_state( |state| state.operator_stack.pop()        )            .expect("Operator popped when no operator was on the stack. This likely means there is an invalid keymap config");        self.sync_vim_settings(cx);        popped_operator    }    fn clear_operator(&mut self, cx: &mut WindowContext) {        self.take_count(cx);        self.update_state(|state| state.operator_stack.clear());        self.sync_vim_settings(cx);    }     fn active_operator(&self) -> Option<Operator> {        self.state().operator_stack.last().copied()    }     fn active_editor_input_ignored(text: Arc<str>, cx: &mut WindowContext) {        if text.is_empty() {            return;        }         match Vim::read(cx).active_operator() {            Some(Operator::FindForward { before }) => {                let find = Motion::FindForward {                    before,                    char: text.chars().next().unwrap(),                };                Vim::update(cx, |vim, _| {                    vim.workspace_state.last_find = Some(find.clone())                });                motion::motion(find, cx)            }            Some(Operator::FindBackward { after }) => {                let find = Motion::FindBackward {                    after,                    char: text.chars().next().unwrap(),                };                Vim::update(cx, |vim, _| {                    vim.workspace_state.last_find = Some(find.clone())                });                motion::motion(find, cx)            }            Some(Operator::Replace) => match Vim::read(cx).state().mode {                Mode::Normal => normal_replace(text, cx),

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