mostly working

src/bridge/events.rs

@@ -700,7 +700,7 @@ fn parse_win_external_pos(win_external_pos_arguments: Vec<Value>) -> Result<Redr
     let [grid, _window] = extract_values(win_external_pos_arguments, [Value::Nil, Value::Nil])?;
 
     Ok(RedrawEvent::WindowExternalPosition {
-        grid: parse_u64(grid)?
+        grid: parse_u64(grid)?,
     })
 }
 

src/bridge/mod.rs

@@ -4,12 +4,12 @@ pub mod layouts;
 mod events;
 mod ui_commands;
 
-use std::process::{Stdio, Command};
-use std::sync::atomic::{AtomicBool, Ordering};
-use std::sync::Arc;
-use std::sync::mpsc::{Sender, Receiver};
 use std::env;
 use std::path::Path;
+use std::process::{Command, Stdio};
+use std::sync::atomic::{AtomicBool, Ordering};
+use std::sync::mpsc::{Receiver, Sender};
+use std::sync::Arc;
 use std::thread;
 
 #[cfg(windows)]
@@ -108,10 +108,16 @@ pub fn create_nvim_command() -> Command {
     cmd
 }
 
-pub fn start_bridge(ui_command_sender: Sender<UiCommand>, ui_command_receiver: Receiver<UiCommand>, redraw_event_sender: Sender<RedrawEvent>, running: Arc<AtomicBool>) {
+pub fn start_bridge(
+    ui_command_sender: Sender<UiCommand>,
+    ui_command_receiver: Receiver<UiCommand>,
+    redraw_event_sender: Sender<RedrawEvent>,
+    running: Arc<AtomicBool>,
+) {
     thread::spawn(move || {
         let (width, height) = window_geometry_or_default();
-        let mut session = Session::new_child_cmd(&mut create_nvim_command()).unwrap_or_explained_panic("Could not locate or start neovim process");
+        let mut session = Session::new_child_cmd(&mut create_nvim_command())
+            .unwrap_or_explained_panic("Could not locate or start neovim process");
         let notification_receiver = session.start_event_loop_channel();
 
         let mut nvim = Neovim::new(session);
@@ -126,7 +132,8 @@ pub fn start_bridge(ui_command_sender: Sender<UiCommand>, ui_command_receiver: R
             std::process::exit(0);
         };
 
-        nvim.set_var("neovide", Value::Boolean(true)).unwrap_or_explained_panic("Could not communicate with neovim process");
+        nvim.set_var("neovide", Value::Boolean(true))
+            .unwrap_or_explained_panic("Could not communicate with neovim process");
         if let Err(command_error) = nvim.command("runtime! ginit.vim") {
             nvim.command(&format!(
                 "echomsg \"error encountered in ginit.vim {:?}\"",
@@ -200,15 +207,13 @@ pub fn start_bridge(ui_command_sender: Sender<UiCommand>, ui_command_receiver: R
         SETTINGS.setup_changed_listeners(&mut nvim);
 
         let notification_running = running.clone();
-        thread::spawn(move || {
-            loop {
+        thread::spawn(move || loop {
             if !notification_running.load(Ordering::Relaxed) {
                 break;
             }
 
             match notification_receiver.recv() {
-                    Ok((event_name, arguments)) =>
-                        match event_name.as_ref() {
+                Ok((event_name, arguments)) => match event_name.as_ref() {
                     "redraw" => {
                         for events in arguments {
                             let parsed_events = parse_redraw_event(events)
@@ -233,16 +238,15 @@ pub fn start_bridge(ui_command_sender: Sender<UiCommand>, ui_command_receiver: R
                     _ => {}
                 },
                 Err(error) => {
+                    error!("Notification channel closed: {}", error);
                     notification_running.store(false, Ordering::Relaxed);
                     break;
                 }
             }
-            } 
         });
 
         let ui_command_running = running.clone();
-        thread::spawn(move || {
-            loop {
+        thread::spawn(move || loop {
             if !ui_command_running.load(Ordering::Relaxed) {
                 break;
             }
@@ -250,13 +254,13 @@ pub fn start_bridge(ui_command_sender: Sender<UiCommand>, ui_command_receiver: R
             match ui_command_receiver.recv() {
                 Ok(ui_command) => {
                     ui_command.execute(&mut nvim);
-                    },
+                }
                 Err(error) => {
+                    error!("Ui command channel closed: {}", error);
                     ui_command_running.store(false, Ordering::Relaxed);
                     break;
                 }
             }
-            }
         });
     });
 }

src/bridge/ui_commands.rs

@@ -52,7 +52,14 @@ impl UiCommand {
                 grid_id,
                 position: (grid_x, grid_y),
             } => {
-                nvim.input_mouse("left", &action, "", grid_id as i64, grid_y as i64, grid_x as i64)
+                nvim.input_mouse(
+                    "left",
+                    &action,
+                    "",
+                    grid_id as i64,
+                    grid_y as i64,
+                    grid_x as i64,
+                )
                 .expect("Mouse Input Failed");
             }
             UiCommand::Scroll {
@@ -60,14 +67,28 @@ impl UiCommand {
                 grid_id,
                 position: (grid_x, grid_y),
             } => {
-                nvim.input_mouse("wheel", &direction, "", grid_id as i64, grid_y as i64, grid_x as i64)
+                nvim.input_mouse(
+                    "wheel",
+                    &direction,
+                    "",
+                    grid_id as i64,
+                    grid_y as i64,
+                    grid_x as i64,
+                )
                 .expect("Mouse Scroll Failed");
             }
             UiCommand::Drag {
                 grid_id,
-                position: (grid_x, grid_y)
+                position: (grid_x, grid_y),
             } => {
-                nvim.input_mouse("left", "drag", "", grid_id as i64, grid_y as i64, grid_x as i64)
+                nvim.input_mouse(
+                    "left",
+                    "drag",
+                    "",
+                    grid_id as i64,
+                    grid_y as i64,
+                    grid_x as i64,
+                )
                 .expect("Mouse Drag Failed");
             }
             UiCommand::FocusLost => nvim

src/editor/draw_command_batcher.rs

@@ -0,0 +1,31 @@
+use std::sync::mpsc::{channel, Receiver, SendError, Sender};
+
+use super::DrawCommand;
+
+pub struct DrawCommandBatcher {
+    window_draw_command_sender: Sender<DrawCommand>,
+    window_draw_command_receiver: Receiver<DrawCommand>,
+
+    batched_draw_command_sender: Sender<Vec<DrawCommand>>,
+}
+
+impl DrawCommandBatcher {
+    pub fn new(batched_draw_command_sender: Sender<Vec<DrawCommand>>) -> DrawCommandBatcher {
+        let (sender, receiver) = channel();
+
+        DrawCommandBatcher {
+            window_draw_command_sender: sender,
+            window_draw_command_receiver: receiver,
+            batched_draw_command_sender,
+        }
+    }
+
+    pub fn queue(&self, draw_command: DrawCommand) -> Result<(), SendError<DrawCommand>> {
+        self.window_draw_command_sender.send(draw_command)
+    }
+
+    pub fn send_batch(&self) -> Result<(), SendError<Vec<DrawCommand>>> {
+        let batch = self.window_draw_command_receiver.try_iter().collect();
+        self.batched_draw_command_sender.send(batch)
+    }
+}

src/editor/grid.rs

@@ -71,7 +71,10 @@ impl CharacterGrid {
 
     pub fn row(&self, row_index: u64) -> Option<&[GridCell]> {
         if row_index < self.height {
-            Some(&self.characters[(row_index * self.width) as usize..((row_index + 1) * self.width) as usize])
+            Some(
+                &self.characters
+                    [(row_index * self.width) as usize..((row_index + 1) * self.width) as usize],
+            )
         } else {
             None
         }
@@ -230,7 +233,6 @@ mod tests {
             (thread_rng().gen::<u64>() % 500) + 1,
             (thread_rng().gen::<u64>() % 500) + 1,
         );
-        let new_area = (width * height) as usize;
 
         let grid_cell = Some((
             "foo".to_string(),
@@ -243,6 +245,18 @@ mod tests {
 
         assert_eq!(character_grid.width, width);
         assert_eq!(character_grid.height, height);
-        assert_eq!(character_grid.characters, vec![grid_cell.clone(); new_area]);
+
+        let (original_width, original_height) = context.size;
+        for x in 0..original_width.min(width) {
+            for y in 0..original_height.min(height) {
+                assert_eq!(character_grid.get_cell(x, y).unwrap(), &grid_cell);
+            }
+        }
+
+        for x in original_width..width {
+            for y in original_height..height {
+                assert_eq!(character_grid.get_cell(x, y).unwrap(), &None);
+            }
+        }
     }
 }

src/editor/mod.rs

@@ -1,19 +1,21 @@
 mod cursor;
+mod draw_command_batcher;
 mod grid;
 mod style;
 mod window;
 
 use std::collections::HashMap;
+use std::fmt;
+use std::sync::mpsc::{Receiver, Sender};
 use std::sync::Arc;
-use std::sync::mpsc::{Sender, Receiver};
 use std::thread;
-use std::fmt;
 
-use log::{error, warn, trace};
+use log::{error, trace, warn};
 
 use crate::bridge::{EditorMode, GuiOption, RedrawEvent, WindowAnchor};
 use crate::redraw_scheduler::REDRAW_SCHEDULER;
 pub use cursor::{Cursor, CursorMode, CursorShape};
+pub use draw_command_batcher::DrawCommandBatcher;
 pub use grid::CharacterGrid;
 pub use style::{Colors, Style};
 pub use window::*;
@@ -26,24 +28,18 @@ pub struct AnchorInfo {
 }
 
 impl WindowAnchor {
-    fn modified_top_left(&self, grid_left: f64, grid_top: f64, width: u64, height: u64) -> (f64, f64) {
+    fn modified_top_left(
+        &self,
+        grid_left: f64,
+        grid_top: f64,
+        width: u64,
+        height: u64,
+    ) -> (f64, f64) {
         match self {
-            WindowAnchor::NorthWest => (
-                grid_left,
-                grid_top,
-            ),
-            WindowAnchor::NorthEast => (
-                grid_left - width as f64,
-                grid_top,
-            ),
-            WindowAnchor::SouthWest => (
-                grid_left,
-                grid_top - height as f64,
-            ),
-            WindowAnchor::SouthEast => (
-                grid_left - width as f64,
-                grid_top - height as f64,
-            ),
+            WindowAnchor::NorthWest => (grid_left, grid_top),
+            WindowAnchor::NorthEast => (grid_left - width as f64, grid_top),
+            WindowAnchor::SouthWest => (grid_left, grid_top - height as f64),
+            WindowAnchor::SouthEast => (grid_left - width as f64, grid_top - height as f64),
         }
     }
 }
@@ -52,7 +48,7 @@ pub enum DrawCommand {
     CloseWindow(u64),
     Window {
         grid_id: u64,
-        command: WindowDrawCommand
+        command: WindowDrawCommand,
     },
     UpdateCursor(Cursor),
     FontChanged(String),
@@ -68,7 +64,9 @@ impl fmt::Debug for DrawCommand {
     fn fmt(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
         match self {
             DrawCommand::CloseWindow(_) => write!(formatter, "CloseWindow"),
-            DrawCommand::Window { grid_id, command } => write!(formatter, "Window {} {:?}", grid_id, command),
+            DrawCommand::Window { grid_id, command } => {
+                write!(formatter, "Window {} {:?}", grid_id, command)
+            }
             DrawCommand::UpdateCursor(_) => write!(formatter, "UpdateCursor"),
             DrawCommand::FontChanged(_) => write!(formatter, "FontChanged"),
             DrawCommand::DefaultStyleChanged(_) => write!(formatter, "DefaultStyleChanged"),
@@ -82,28 +80,33 @@ pub struct Editor {
     pub defined_styles: HashMap<u64, Arc<Style>>,
     pub mode_list: Vec<CursorMode>,
     pub current_mode: EditorMode,
-    pub draw_command_sender: Sender<DrawCommand>,
+    pub draw_command_batcher: Arc<DrawCommandBatcher>,
     pub window_command_sender: Sender<WindowCommand>,
 }
 
 impl Editor {
-    pub fn new(draw_command_sender: Sender<DrawCommand>, window_command_sender: Sender<WindowCommand>) -> Editor {
+    pub fn new(
+        batched_draw_command_sender: Sender<Vec<DrawCommand>>,
+        window_command_sender: Sender<WindowCommand>,
+    ) -> Editor {
         Editor {
             windows: HashMap::new(),
             cursor: Cursor::new(),
             defined_styles: HashMap::new(),
             mode_list: Vec::new(),
             current_mode: EditorMode::Unknown(String::from("")),
-            draw_command_sender,
-            window_command_sender
+            draw_command_batcher: Arc::new(DrawCommandBatcher::new(batched_draw_command_sender)),
+            window_command_sender,
         }
     }
 
     pub fn handle_redraw_event(&mut self, event: RedrawEvent) {
         match event {
             RedrawEvent::SetTitle { title } => {
-                self.window_command_sender.send(WindowCommand::TitleChanged(title)).ok();
-            },
+                self.window_command_sender
+                    .send(WindowCommand::TitleChanged(title))
+                    .ok();
+            }
             RedrawEvent::ModeInfoSet { cursor_modes } => self.mode_list = cursor_modes,
             RedrawEvent::OptionSet { gui_option } => self.set_option(gui_option),
             RedrawEvent::ModeChange { mode, mode_index } => {
@@ -113,10 +116,14 @@ impl Editor {
                 }
             }
             RedrawEvent::MouseOn => {
-                self.window_command_sender.send(WindowCommand::SetMouseEnabled(true)).ok();
+                self.window_command_sender
+                    .send(WindowCommand::SetMouseEnabled(true))
+                    .ok();
             }
             RedrawEvent::MouseOff => {
-                self.window_command_sender.send(WindowCommand::SetMouseEnabled(false)).ok();
+                self.window_command_sender
+                    .send(WindowCommand::SetMouseEnabled(false))
+                    .ok();
             }
             RedrawEvent::BusyStart => {
                 trace!("Cursor off");
@@ -129,17 +136,22 @@ impl Editor {
             RedrawEvent::Flush => {
                 trace!("Image flushed");
                 self.send_cursor_info();
+                self.draw_command_batcher.send_batch().ok();
                 REDRAW_SCHEDULER.queue_next_frame();
             }
             RedrawEvent::DefaultColorsSet { colors } => {
-                self.draw_command_sender.send(DrawCommand::DefaultStyleChanged(Style::new(colors))).ok();
+                self.draw_command_batcher
+                    .queue(DrawCommand::DefaultStyleChanged(Style::new(colors)))
+                    .ok();
             }
             RedrawEvent::HighlightAttributesDefine { id, style } => {
                 self.defined_styles.insert(id, Arc::new(style));
             }
-            RedrawEvent::CursorGoto { grid, column: left, row: top } => {
-                self.set_cursor_position(grid, left, top)
-            }
+            RedrawEvent::CursorGoto {
+                grid,
+                column: left,
+                row: top,
+            } => self.set_cursor_position(grid, left, top),
             RedrawEvent::Resize {
                 grid,
                 width,
@@ -154,19 +166,12 @@ impl Editor {
                 cells,
             } => {
                 let defined_styles = &self.defined_styles;
-                self.windows.get_mut(&grid).map(|window| {
-                    window.draw_grid_line(
-                        row,
-                        column_start,
-                        cells,
-                        defined_styles
-                    )
-                });
-            }
-            RedrawEvent::Clear { grid } => {
                 self.windows
                     .get_mut(&grid)
-                    .map(|window| window.clear());
+                    .map(|window| window.draw_grid_line(row, column_start, cells, defined_styles));
+            }
+            RedrawEvent::Clear { grid } => {
+                self.windows.get_mut(&grid).map(|window| window.clear());
             }
             RedrawEvent::Destroy { grid } => self.close_window(grid),
             RedrawEvent::Scroll {
@@ -196,13 +201,9 @@ impl Editor {
                 anchor_column: anchor_left,
                 anchor_row: anchor_top,
                 ..
-            } => {
-                self.set_window_float_position(grid, anchor_grid, anchor, anchor_left, anchor_top)
-            }
+            } => self.set_window_float_position(grid, anchor_grid, anchor, anchor_left, anchor_top),
             RedrawEvent::WindowHide { grid } => {
-                self.windows
-                    .get(&grid)
-                    .map(|window| window.hide());
+                self.windows.get(&grid).map(|window| window.hide());
             }
             RedrawEvent::WindowClose { grid } => self.close_window(grid),
             RedrawEvent::MessageSetPosition { grid, row, .. } => {
@@ -215,7 +216,9 @@ impl Editor {
     fn close_window(&mut self, grid: u64) {
         if let Some(window) = self.windows.remove(&grid) {
             window.close();
-            self.draw_command_sender.send(DrawCommand::CloseWindow(grid)).ok();
+            self.draw_command_batcher
+                .queue(DrawCommand::CloseWindow(grid))
+                .ok();
         }
     }
 
@@ -231,7 +234,8 @@ impl Editor {
                 None,
                 0.0,
                 0.0,
-                self.draw_command_sender.clone());
+                self.draw_command_batcher.clone(),
+            );
             self.windows.insert(grid, window);
         }
     }
@@ -246,12 +250,7 @@ impl Editor {
     ) {
         warn!("position {}", grid);
         if let Some(window) = self.windows.get_mut(&grid) {
-            window.position(
-                width,
-                height,
-                None,
-                start_left as f64,
-                start_top as f64);
+            window.position(width, height, None, start_left as f64, start_top as f64);
             window.show();
         } else {
             let new_window = Window::new(
@@ -261,7 +260,7 @@ impl Editor {
                 None,
                 start_left as f64,
                 start_top as f64,
-                self.draw_command_sender.clone()
+                self.draw_command_batcher.clone(),
             );
             self.windows.insert(grid, new_window);
         }
@@ -280,9 +279,8 @@ impl Editor {
         if let Some(window) = self.windows.get_mut(&grid) {
             let width = window.get_width();
             let height = window.get_height();
-            let (mut modified_left, mut modified_top) = anchor_type.modified_top_left(
-                anchor_left, anchor_top,
-                width, height);
+            let (mut modified_left, mut modified_top) =
+                anchor_type.modified_top_left(anchor_left, anchor_top, width, height);
 
             if let Some((parent_left, parent_top)) = parent_position {
                 modified_left = parent_left + modified_left;
@@ -290,12 +288,17 @@ impl Editor {
             }
 
             window.position(
-                width, height,
+                width,
+                height,
                 Some(AnchorInfo {
                     anchor_grid_id: anchor_grid,
-                    anchor_type, anchor_left, anchor_top
+                    anchor_type,
+                    anchor_left,
+                    anchor_top,
                 }),
-                modified_left, modified_top);
+                modified_left,
+                modified_top,
+            );
             window.show();
         } else {
             error!("Attempted to float window that does not exist.");
@@ -304,14 +307,20 @@ impl Editor {
 
     fn set_message_position(&mut self, grid: u64, grid_top: u64) {
         warn!("message position {}", grid);
-        let parent_width = self.windows.get(&1).map(|parent| parent.get_width()).unwrap_or(1);
+        let parent_width = self
+            .windows
+            .get(&1)
+            .map(|parent| parent.get_width())
+            .unwrap_or(1);
 
         if let Some(window) = self.windows.get_mut(&grid) {
             window.position(
-                parent_width, window.get_height(),
+                parent_width,
+                window.get_height(),
                 None,
                 0.0,
-                grid_top as f64);
+                grid_top as f64,
+            );
             window.show();
         } else {
             let new_window = Window::new(
@@ -321,7 +330,7 @@ impl Editor {
                 None,
                 0.0,
                 grid_top as f64,
-                self.draw_command_sender.clone()
+                self.draw_command_batcher.clone(),
             );
             self.windows.insert(grid, new_window);
         }
@@ -336,11 +345,18 @@ impl Editor {
                 let (parent_anchor_left, parent_anchor_top) =
                     self.get_window_top_left(anchor_info.anchor_grid_id)?;
 
-                let (anchor_modified_left, anchor_modified_top) = anchor_info.anchor_type.modified_top_left(
-                    anchor_info.anchor_left, anchor_info.anchor_top,
-                    window.get_width(), window.get_height());
+                let (anchor_modified_left, anchor_modified_top) =
+                    anchor_info.anchor_type.modified_top_left(
+                        anchor_info.anchor_left,
+                        anchor_info.anchor_top,
+                        window.get_width(),
+                        window.get_height(),
+                    );
 
-                Some((parent_anchor_left + anchor_modified_left, parent_anchor_top + anchor_modified_top))
+                Some((
+                    parent_anchor_left + anchor_modified_left,
+                    parent_anchor_top + anchor_modified_top,
+                ))
             }
             None => Some(window.get_grid_position()),
         }
@@ -355,10 +371,12 @@ impl Editor {
         let (grid_left, grid_top) = self.cursor.grid_position;
         match self.get_window_top_left(self.cursor.parent_window_id) {
             Some((window_left, window_top)) => {
-                self.cursor.position = (window_left + grid_left as f64, window_top + grid_top as f64);
+                self.cursor.position =
+                    (window_left + grid_left as f64, window_top + grid_top as f64);
 
                 if let Some(window) = self.windows.get(&self.cursor.parent_window_id) {
-                    let (character, double_width) = window.get_cursor_character(grid_left, grid_top);
+                    let (character, double_width) =
+                        window.get_cursor_character(grid_left, grid_top);
                     self.cursor.character = character;
                     self.cursor.double_width = double_width;
                 }
@@ -369,20 +387,28 @@ impl Editor {
                 self.cursor.character = " ".to_string();
             }
         }
-        self.draw_command_sender.send(DrawCommand::UpdateCursor(self.cursor.clone())).ok();
+        self.draw_command_batcher
+            .queue(DrawCommand::UpdateCursor(self.cursor.clone()))
+            .ok();
     }
 
     fn set_option(&mut self, gui_option: GuiOption) {
         trace!("Option set {:?}", &gui_option);
         if let GuiOption::GuiFont(guifont) = gui_option {
-            self.draw_command_sender.send(DrawCommand::FontChanged(guifont)).ok();
+            self.draw_command_batcher
+                .queue(DrawCommand::FontChanged(guifont))
+                .ok();
         }
     }
 }
 
-pub fn start_editor(redraw_event_receiver: Receiver<RedrawEvent>, draw_command_sender: Sender<DrawCommand>, window_command_sender: Sender<WindowCommand>) {
+pub fn start_editor(
+    redraw_event_receiver: Receiver<RedrawEvent>,
+    batched_draw_command_sender: Sender<Vec<DrawCommand>>,
+    window_command_sender: Sender<WindowCommand>,
+) {
     thread::spawn(move || {
-        let mut editor = Editor::new(draw_command_sender, window_command_sender);
+        let mut editor = Editor::new(batched_draw_command_sender, window_command_sender);
 
         loop {
             if let Ok(redraw_event) = redraw_event_receiver.recv() {

src/editor/window.rs

@@ -1,14 +1,13 @@
 use std::collections::HashMap;
-use std::sync::Arc;
-use std::sync::mpsc::Sender;
 use std::fmt;
+use std::sync::Arc;
 
 use log::warn;
 use unicode_segmentation::UnicodeSegmentation;
 
-use super::{DrawCommand, AnchorInfo};
 use super::grid::CharacterGrid;
 use super::style::Style;
+use super::{AnchorInfo, DrawCommand, DrawCommandBatcher};
 use crate::bridge::GridLineCell;
 
 #[derive(new, Clone)]
@@ -18,7 +17,7 @@ pub enum WindowDrawCommand {
         grid_top: f64,
         width: u64,
         height: u64,
-        floating: bool
+        floating: bool,
     },
     Cell {
         text: String,
@@ -38,7 +37,7 @@ pub enum WindowDrawCommand {
     Clear,
     Show,
     Hide,
-    Close
+    Close,
 }
 
 impl fmt::Debug for WindowDrawCommand {
@@ -64,7 +63,7 @@ pub struct Window {
     grid_left: f64,
     grid_top: f64,
 
-    draw_command_sender: Sender<DrawCommand>
+    draw_command_batcher: Arc<DrawCommandBatcher>,
 }
 
 impl Window {
@@ -75,7 +74,7 @@ impl Window {
         anchor_info: Option<AnchorInfo>,
         grid_left: f64,
         grid_top: f64,
-        draw_command_sender: Sender<DrawCommand>
+        draw_command_batcher: Arc<DrawCommandBatcher>,
     ) -> Window {
         let window = Window {
             grid_id,
@@ -83,17 +82,19 @@ impl Window {
             anchor_info,
             grid_left,
             grid_top,
-            draw_command_sender
+            draw_command_batcher,
         };
         window.send_updated_position();
         window
     }
 
     fn send_command(&self, command: WindowDrawCommand) {
-        self.draw_command_sender.send(DrawCommand::Window {
+        self.draw_command_batcher
+            .queue(DrawCommand::Window {
                 grid_id: self.grid_id,
-            command
-        }).ok();
+                command,
+            })
+            .ok();
     }
 
     fn send_updated_position(&self) {
@@ -132,7 +133,14 @@ impl Window {
         (self.grid_left, self.grid_top)
     }
 
-    pub fn position(&mut self, width: u64, height: u64, anchor_info: Option<AnchorInfo>, grid_left: f64, grid_top: f64) {
+    pub fn position(
+        &mut self,
+        width: u64,
+        height: u64,
+        anchor_info: Option<AnchorInfo>,
+        grid_left: f64,
+        grid_top: f64,
+    ) {
         self.grid.resize(width, height);
         self.anchor_info = anchor_info;
         self.grid_left = grid_left;
@@ -156,12 +164,8 @@ impl Window {
         // Get the defined style from the style list
         let style = match cell.highlight_id {
             Some(0) => None,
-            Some(style_id) => {
-                defined_styles.get(&style_id).cloned()
-            },
-            None => {
-                previous_style.clone()
-            },
+            Some(style_id) => defined_styles.get(&style_id).cloned(),
+            None => previous_style.clone(),
         };
 
         // Compute text
@@ -185,16 +189,14 @@ impl Window {
             *column_pos += text.graphemes(true).count() as u64;
         }
 
-        if let Some(style) = style {
-            *previous_style = Some(style);
-        }
+        *previous_style = style;
     }
 
     fn send_draw_command(
         &mut self,
         row_index: u64,
         line_start: u64,
-        current_start: u64
+        current_start: u64,
     ) -> Option<u64> {
         let row = self.grid.row(row_index).unwrap();
 
@@ -217,7 +219,6 @@ impl Window {
             }
         }
 
-
         let mut draw_command_end_index = current_start;
         for possible_end_index in draw_command_start_index..self.grid.width {
             if let Some((_, possible_end_style)) = &row[possible_end_index as usize] {
@@ -242,7 +243,7 @@ impl Window {
             cell_width: draw_command_end_index - draw_command_start_index + 1,
             window_left: draw_command_start_index,
             window_top: row_index,
-            style: style.clone()
+            style: style.clone(),
         });
 
         Some(draw_command_end_index + 1)
@@ -253,7 +254,7 @@ impl Window {
         row: u64,
         column_start: u64,
         cells: Vec<GridLineCell>,
-        defined_styles: &HashMap<u64, Arc<Style>>
+        defined_styles: &HashMap<u64, Arc<Style>>,
     ) {
         let mut previous_style = None;
         if row < self.grid.height {
@@ -297,7 +298,12 @@ impl Window {
         };
 
         self.send_command(WindowDrawCommand::Scroll {
-            top, bot, left, right, rows, cols
+            top,
+            bot,
+            left,
+            right,
+            rows,
+            cols,
         });
 
         // Scrolls must not only translate the rendered texture, but also must move the grid data

src/main.rs

@@ -18,10 +18,10 @@ extern crate rust_embed;
 #[macro_use]
 extern crate lazy_static;
 
-use std::sync::Arc;
+use std::process;
 use std::sync::atomic::AtomicBool;
 use std::sync::mpsc::channel;
-use std::process;
+use std::sync::Arc;
 
 use window::window_geometry;
 
@@ -132,11 +132,25 @@ fn main() {
     let running = Arc::new(AtomicBool::new(true));
 
     let (redraw_event_sender, redraw_event_receiver) = channel();
-    let (draw_command_sender, draw_command_receiver) = channel();
+    let (batched_draw_command_sender, batched_draw_command_receiver) = channel();
     let (ui_command_sender, ui_command_receiver) = channel();
     let (window_command_sender, window_command_receiver) = channel();
 
-    start_bridge(ui_command_sender.clone(), ui_command_receiver, redraw_event_sender, running.clone());
-    start_editor(redraw_event_receiver, draw_command_sender, window_command_sender);
-    start_window(draw_command_receiver, window_command_receiver, ui_command_sender, running.clone());
+    start_bridge(
+        ui_command_sender.clone(),
+        ui_command_receiver,
+        redraw_event_sender,
+        running.clone(),
+    );
+    start_editor(
+        redraw_event_receiver,
+        batched_draw_command_sender,
+        window_command_sender,
+    );
+    start_window(
+        batched_draw_command_receiver,
+        window_command_receiver,
+        ui_command_sender,
+        running.clone(),
+    );
 }

src/renderer/cursor_renderer/cursor_vfx.rs

@@ -2,8 +2,8 @@ use log::error;
 use skulpin::skia_safe::{paint::Style, BlendMode, Canvas, Color, Paint, Point, Rect};
 
 use super::CursorSettings;
-use crate::renderer::animation_utils::*;
 use crate::editor::{Colors, Cursor};
+use crate::renderer::animation_utils::*;
 use crate::settings::*;
 
 pub trait CursorVfx {

src/renderer/cursor_renderer/mod.rs

@@ -5,8 +5,8 @@ use skulpin::skia_safe::{Canvas, Paint, Path, Point};
 
 use crate::editor::{Colors, Cursor, CursorShape};
 use crate::redraw_scheduler::REDRAW_SCHEDULER;
-use crate::renderer::CachingShaper;
 use crate::renderer::animation_utils::*;
+use crate::renderer::CachingShaper;
 use crate::settings::*;
 
 use blink::*;
@@ -277,7 +277,9 @@ impl CursorRenderer {
             self.previous_cursor_shape = new_cursor.clone();
             self.set_cursor_shape(
                 &new_cursor.unwrap(),
-                self.cursor.cell_percentage.unwrap_or(DEFAULT_CELL_PERCENTAGE),
+                self.cursor
+                    .cell_percentage
+                    .unwrap_or(DEFAULT_CELL_PERCENTAGE),
             );
 
             if let Some(vfx) = self.cursor_vfx.as_mut() {

src/renderer/mod.rs

@@ -1,28 +1,25 @@
 use std::collections::HashMap;
-use std::sync::Arc;
 use std::sync::mpsc::Receiver;
+use std::sync::Arc;
 
-use log::{trace, warn, error};
-use skulpin::skia_safe::{
-    colors, dash_path_effect, Canvas, Paint, Rect, BlendMode, Color
-};
+use log::{error, trace, warn};
+use skulpin::skia_safe::{colors, dash_path_effect, BlendMode, Canvas, Color, Paint, Rect};
 use skulpin::CoordinateSystemHelper;
 
+pub mod animation_utils;
 mod caching_shaper;
-mod rendered_window;
 pub mod cursor_renderer;
 pub mod font_options;
-pub mod animation_utils;
+mod rendered_window;
 
 pub use caching_shaper::CachingShaper;
 pub use font_options::*;
 
-use crate::editor::{Style, Colors, DrawCommand, WindowDrawCommand};
+use crate::editor::{Colors, DrawCommand, Style, WindowDrawCommand};
 use crate::settings::*;
 use cursor_renderer::CursorRenderer;
 use rendered_window::RenderedWindow;
 
-
 // ----------------------------------------------------------------------------
 
 #[derive(Clone)]
@@ -39,14 +36,19 @@ pub fn initialize_settings() {
         floating_blur: true,
     });
 
-    register_nvim_setting!("window_animation_length", RendererSettings::animation_length);
-    register_nvim_setting!("floating_window_opacity", RendererSettings::floating_opacity);
+    register_nvim_setting!(
+        "window_animation_length",
+        RendererSettings::animation_length
+    );
+    register_nvim_setting!(
+        "floating_window_opacity",
+        RendererSettings::floating_opacity
+    );
     register_nvim_setting!("floating_window_blur", RendererSettings::floating_opacity);
 }
 
 // ----------------------------------------------------------------------------
 
-
 pub struct Renderer {
     rendered_windows: HashMap<u64, RenderedWindow>,
     cursor_renderer: CursorRenderer,
@@ -58,11 +60,11 @@ pub struct Renderer {
     pub font_width: f32,
     pub font_height: f32,
     pub window_regions: Vec<(u64, Rect)>,
-    pub draw_command_receiver: Receiver<DrawCommand>,
+    pub batched_draw_command_receiver: Receiver<Vec<DrawCommand>>,
 }
 
 impl Renderer {
-    pub fn new(draw_command_receiver: Receiver<DrawCommand>) -> Renderer {
+    pub fn new(batched_draw_command_receiver: Receiver<Vec<DrawCommand>>) -> Renderer {
         let rendered_windows = HashMap::new();
         let cursor_renderer = CursorRenderer::new();
         let settings = SETTINGS.get::<RendererSettings>();
@@ -89,7 +91,7 @@ impl Renderer {
             font_width,
             font_height,
             window_regions,
-            draw_command_receiver,
+            batched_draw_command_receiver,
         }
     }
 
@@ -124,7 +126,8 @@ impl Renderer {
         let region = self.compute_text_region(grid_pos, cell_width);
         let style = style.as_ref().unwrap_or(&self.default_style);
 
-        self.paint.set_color(style.background(&self.default_style.colors).to_color());
+        self.paint
+            .set_color(style.background(&self.default_style.colors).to_color());
         canvas.draw_rect(region, &self.paint);
     }
 
@@ -205,44 +208,49 @@ impl Renderer {
         match draw_command {
             DrawCommand::Window {
                 grid_id,
-                command: WindowDrawCommand::Close
+                command: WindowDrawCommand::Close,
             } => {
                 self.rendered_windows.remove(&grid_id);
-            },
-            DrawCommand::Window {
-                grid_id,
-                command
-            } => {
+            }
+            DrawCommand::Window { grid_id, command } => {
                 if let Some(rendered_window) = self.rendered_windows.remove(&grid_id) {
                     warn!("Window positioned {}", grid_id);
                     let rendered_window = rendered_window.handle_window_draw_command(self, command);
                     self.rendered_windows.insert(grid_id, rendered_window);
                 } else if let WindowDrawCommand::Position {
-                    grid_left, grid_top,
-                    width, height, ..
-                } = command {
+                    grid_left,
+                    grid_top,
+                    width,
+                    height,
+                    ..
+                } = command
+                {
                     warn!("Created window {}", grid_id);
                     let new_window = RenderedWindow::new(
-                        root_canvas, &self, grid_id, 
+                        root_canvas,
+                        &self,
+                        grid_id,
                         (grid_left as f32, grid_top as f32).into(),
-                        width, height);
+                        width,
+                        height,
+                    );
                     self.rendered_windows.insert(grid_id, new_window);
                 } else {
                     error!("WindowDrawCommand sent for uninitialized grid {}", grid_id);
                 }
-            },
+            }
             DrawCommand::UpdateCursor(new_cursor) => {
                 self.cursor_renderer.update_cursor(new_cursor);
-            },
+            }
             DrawCommand::FontChanged(new_font) => {
                 if self.update_font(&new_font) {
                     // Resize all the grids
                 }
-            },
+            }
             DrawCommand::DefaultStyleChanged(new_style) => {
                 self.default_style = Arc::new(new_style);
-            },
-            _ => { }
+            }
+            _ => {}
         }
     }
 
@@ -255,7 +263,12 @@ impl Renderer {
         trace!("Rendering");
         let mut font_changed = false;
 
-        let draw_commands: Vec<DrawCommand> = self.draw_command_receiver.try_iter().collect();
+        let draw_commands: Vec<DrawCommand> = self
+            .batched_draw_command_receiver
+            .try_iter() // Iterator of Vec of DrawCommand
+            .map(|batch| batch.into_iter()) // Iterator of Iterator of DrawCommand
+            .flatten() // Iterator of DrawCommand
+            .collect(); // Vec of DrawCommand
         for draw_command in draw_commands.into_iter() {
             if let DrawCommand::FontChanged(_) = draw_command {
                 font_changed = true;
@@ -263,20 +276,36 @@ impl Renderer {
             self.handle_draw_command(root_canvas, draw_command);
         }
 
-        root_canvas.clear(self.default_style.colors.background.clone().unwrap().to_color());
+        root_canvas.clear(
+            self.default_style
+                .colors
+                .background
+                .clone()
+                .unwrap()
+                .to_color(),
+        );
 
         coordinate_system_helper.use_logical_coordinates(root_canvas);
 
         let windows: Vec<&mut RenderedWindow> = {
-            let (mut root_windows, mut floating_windows): (Vec<&mut RenderedWindow>, Vec<&mut RenderedWindow>) = self.rendered_windows
+            let (mut root_windows, mut floating_windows): (
+                Vec<&mut RenderedWindow>,
+                Vec<&mut RenderedWindow>,
+            ) = self
+                .rendered_windows
                 .values_mut()
                 .filter(|window| !window.hidden)
                 .partition(|window| !window.floating);
 
-            root_windows.sort_by(|window_a, window_b| window_a.id.partial_cmp(&window_b.id).unwrap());
-            floating_windows.sort_by(|window_a, window_b| window_a.id.partial_cmp(&window_b.id).unwrap());
+            root_windows
+                .sort_by(|window_a, window_b| window_a.id.partial_cmp(&window_b.id).unwrap());
+            floating_windows
+                .sort_by(|window_a, window_b| window_a.id.partial_cmp(&window_b.id).unwrap());
 
-            root_windows.into_iter().chain(floating_windows.into_iter()).collect()
+            root_windows
+                .into_iter()
+                .chain(floating_windows.into_iter())
+                .collect()
         };
 
         let settings = &self.settings;

src/renderer/rendered_window.rs

@@ -1,14 +1,11 @@
+use skulpin::skia_safe::canvas::{SaveLayerRec, SrcRectConstraint};
 use skulpin::skia_safe::gpu::SurfaceOrigin;
 use skulpin::skia_safe::{
-    Budgeted, Canvas, ImageInfo, Rect, Surface, Point, Paint, Color, BlendMode, image_filters::blur
-};
-use skulpin::skia_safe::canvas::{
-    SaveLayerRec,
-    SrcRectConstraint
+    image_filters::blur, BlendMode, Budgeted, Canvas, Color, ImageInfo, Paint, Point, Rect, Surface,
 };
 
-use super::{Renderer, RendererSettings};
 use super::animation_utils::*;
+use super::{Renderer, RendererSettings};
 use crate::editor::WindowDrawCommand;
 use crate::redraw_scheduler::REDRAW_SCHEDULER;
 
@@ -18,7 +15,10 @@ fn build_window_surface(
     grid_width: u64,
     grid_height: u64,
 ) -> Surface {
-    let dimensions = ((grid_width as f32 * renderer.font_width) as i32, (grid_height as f32 * renderer.font_height) as i32);
+    let dimensions = (
+        (grid_width as f32 * renderer.font_width) as i32,
+        (grid_height as f32 * renderer.font_height) as i32,
+    );
     let mut context = parent_canvas.gpu_context().unwrap();
     let budgeted = Budgeted::Yes;
     let parent_image_info = parent_canvas.image_info();
@@ -39,9 +39,26 @@ fn build_window_surface(
         None,
     )
     .expect("Could not create surface");
-    let canvas = surface.canvas();
+    surface
+}
 
-    canvas.clear(renderer.default_style.colors.background.clone().unwrap().to_color());
+fn build_background_window_surface(
+    parent_canvas: &mut Canvas,
+    renderer: &Renderer,
+    grid_width: u64,
+    grid_height: u64,
+) -> Surface {
+    let mut surface = build_window_surface(parent_canvas, renderer, grid_width, grid_height);
+    let canvas = surface.canvas();
+    canvas.clear(
+        renderer
+            .default_style
+            .colors
+            .background
+            .clone()
+            .unwrap()
+            .to_color(),
+    );
     surface
 }
 
@@ -52,18 +69,28 @@ pub struct RenderedWindow {
     pub hidden: bool,
     pub floating: bool,
 
-    grid_width: u64, grid_height: u64,
+    grid_width: u64,
+    grid_height: u64,
 
     grid_start_position: Point,
     grid_current_position: Point,
     grid_destination: Point,
-    t: f32
+    t: f32,
 }
 
 impl RenderedWindow {
-    pub fn new(parent_canvas: &mut Canvas, renderer: &Renderer, id: u64, grid_position: Point, grid_width: u64, grid_height: u64) -> RenderedWindow {
-        let background_surface = build_window_surface(parent_canvas, renderer, grid_width, grid_height);
-        let foreground_surface = build_window_surface(parent_canvas, renderer, grid_width, grid_height);
+    pub fn new(
+        parent_canvas: &mut Canvas,
+        renderer: &Renderer,
+        id: u64,
+        grid_position: Point,
+        grid_width: u64,
+        grid_height: u64,
+    ) -> RenderedWindow {
+        let background_surface =
+            build_background_window_surface(parent_canvas, renderer, grid_width, grid_height);
+        let foreground_surface =
+            build_window_surface(parent_canvas, renderer, grid_width, grid_height);
 
         RenderedWindow {
             background_surface,
@@ -78,15 +105,11 @@ impl RenderedWindow {
             grid_start_position: grid_position,
             grid_current_position: grid_position,
             grid_destination: grid_position,
-            t: 2.0 // 2.0 is out of the 0.0 to 1.0 range and stops animation
+            t: 2.0, // 2.0 is out of the 0.0 to 1.0 range and stops animation
         }
     }
 
-    pub fn update(
-        &mut self,
-        settings: &RendererSettings,
-        dt: f32
-    ) -> bool {
+    pub fn update(&mut self, settings: &RendererSettings, dt: f32) -> bool {
         if (self.t - 1.0).abs() < std::f32::EPSILON {
             return false;
         }
@@ -114,9 +137,12 @@ impl RenderedWindow {
         settings: &RendererSettings,
         font_width: f32,
         font_height: f32,
-        dt: f32
+        dt: f32,
     ) -> (u64, Rect) {
-        let current_pixel_position = Point::new(self.grid_current_position.x * font_width, self.grid_current_position.y * font_height);
+        let current_pixel_position = Point::new(
+            self.grid_current_position.x * font_width,
+            self.grid_current_position.y * font_height,
+        );
 
         let image_width = (self.grid_width as f32 * font_width) as i32;
         let image_height = (self.grid_height as f32 * font_height) as i32;
@@ -132,9 +158,7 @@ impl RenderedWindow {
 
         if self.floating && settings.floating_blur {
             let blur = blur((2.0, 2.0), None, None, None).unwrap();
-            let save_layer_rec = SaveLayerRec::default()
-                .backdrop(&blur)
-                .bounds(&region);
+            let save_layer_rec = SaveLayerRec::default().backdrop(&blur).bounds(&region);
 
             root_canvas.save_layer(&save_layer_rec);
         }
@@ -146,12 +170,20 @@ impl RenderedWindow {
             paint.set_color(Color::from_argb(a, 255, 255, 255));
         }
 
-        self.background_surface.draw(root_canvas.as_mut(), (current_pixel_position.x, current_pixel_position.y), Some(&paint));
+        self.background_surface.draw(
+            root_canvas.as_mut(),
+            (current_pixel_position.x, current_pixel_position.y),
+            Some(&paint),
+        );
 
         let mut paint = Paint::default();
         paint.set_blend_mode(BlendMode::SrcOver);
 
-        self.foreground_surface.draw(root_canvas.as_mut(), (current_pixel_position.x, current_pixel_position.y), Some(&paint));
+        self.foreground_surface.draw(
+            root_canvas.as_mut(),
+            (current_pixel_position.x, current_pixel_position.y),
+            Some(&paint),
+        );
 
         if self.floating {
             root_canvas.restore();
@@ -161,21 +193,31 @@ impl RenderedWindow {
 
         let window_position = current_pixel_position.clone();
 
-        (self.id, Rect::from_point_and_size(window_position, (image_width as f32, image_height as f32)))
+        (
+            self.id,
+            Rect::from_point_and_size(window_position, (image_width as f32, image_height as f32)),
+        )
     }
 
-    pub fn handle_window_draw_command(mut self, renderer: &mut Renderer, draw_command: WindowDrawCommand) -> Self {
+    pub fn handle_window_draw_command(
+        mut self,
+        renderer: &mut Renderer,
+        draw_command: WindowDrawCommand,
+    ) -> Self {
         match draw_command {
             WindowDrawCommand::Position {
-                grid_left, grid_top,
+                grid_left,
+                grid_top,
                 width: grid_width,
                 height: grid_height,
-                floating
+                floating,
             } => {
                 let new_destination: Point = (grid_left as f32, grid_top as f32).into();
 
                 if self.grid_destination != new_destination {
-                    if self.grid_start_position.x.abs() > f32::EPSILON || self.grid_start_position.y.abs() > f32::EPSILON {
+                    if self.grid_start_position.x.abs() > f32::EPSILON
+                        || self.grid_start_position.y.abs() > f32::EPSILON
+                    {
                         self.t = 0.0; // Reset animation as we have a new destination.
                         self.grid_start_position = self.grid_current_position;
                         self.grid_destination = new_destination;
@@ -191,13 +233,23 @@ impl RenderedWindow {
                 if grid_width != self.grid_width || grid_height != self.grid_height {
                     {
                         let mut old_background = self.background_surface;
-                        self.background_surface = build_window_surface(old_background.canvas(), &renderer, grid_width, grid_height);
+                        self.background_surface = build_background_window_surface(
+                            old_background.canvas(),
+                            &renderer,
+                            grid_width,
+                            grid_height,
+                        );
                         old_background.draw(self.background_surface.canvas(), (0.0, 0.0), None);
                     }
 
                     {
                         let mut old_foreground = self.foreground_surface;
-                        self.foreground_surface = build_window_surface(old_foreground.canvas(), &renderer, grid_width, grid_height);
+                        self.foreground_surface = build_window_surface(
+                            old_foreground.canvas(),
+                            &renderer,
+                            grid_width,
+                            grid_height,
+                        );
                         old_foreground.draw(self.foreground_surface.canvas(), (0.0, 0.0), None);
                     }
 
@@ -213,9 +265,13 @@ impl RenderedWindow {
                     self.grid_start_position = new_destination;
                     self.grid_destination = new_destination;
                 }
-            },
+            }
             WindowDrawCommand::Cell {
-                text, cell_width, window_left, window_top, style
+                text,
+                cell_width,
+                window_left,
+                window_top,
+                style,
             } => {
                 let grid_position = (window_left, window_top);
 
@@ -225,7 +281,7 @@ impl RenderedWindow {
                         &mut background_canvas,
                         grid_position,
                         cell_width,
-                        &style
+                        &style,
                     );
                 }
 
@@ -239,15 +295,21 @@ impl RenderedWindow {
                         &style,
                     );
                 }
-            },
+            }
             WindowDrawCommand::Scroll {
-                top, bot, left, right, rows, cols
+                top,
+                bot,
+                left,
+                right,
+                rows,
+                cols,
             } => {
                 let scrolled_region = Rect::new(
                     left as f32 * renderer.font_width,
                     top as f32 * renderer.font_height,
                     right as f32 * renderer.font_width,
-                    bot as f32 * renderer.font_height);
+                    bot as f32 * renderer.font_height,
+                );
 
                 {
                     let background_snapshot = self.background_surface.image_snapshot();
@@ -257,9 +319,17 @@ impl RenderedWindow {
                     background_canvas.clip_rect(scrolled_region, None, Some(false));
 
                     let mut translated_region = scrolled_region.clone();
-                    translated_region.offset((-cols as f32 * renderer.font_width, -rows as f32 * renderer.font_height));
-
-                    background_canvas.draw_image_rect(background_snapshot, Some((&scrolled_region, SrcRectConstraint::Fast)), translated_region, &renderer.paint);
+                    translated_region.offset((
+                        -cols as f32 * renderer.font_width,
+                        -rows as f32 * renderer.font_height,
+                    ));
+
+                    background_canvas.draw_image_rect(
+                        background_snapshot,
+                        Some((&scrolled_region, SrcRectConstraint::Fast)),
+                        translated_region,
+                        &renderer.paint,
+                    );
 
                     background_canvas.restore();
                 }
@@ -272,20 +342,38 @@ impl RenderedWindow {
                     foreground_canvas.clip_rect(scrolled_region, None, Some(false));
 
                     let mut translated_region = scrolled_region.clone();
-                    translated_region.offset((-cols as f32 * renderer.font_width, -rows as f32 * renderer.font_height));
-
-                    foreground_canvas.draw_image_rect(foreground_snapshot, Some((&scrolled_region, SrcRectConstraint::Fast)), translated_region, &renderer.paint);
+                    translated_region.offset((
+                        -cols as f32 * renderer.font_width,
+                        -rows as f32 * renderer.font_height,
+                    ));
+
+                    foreground_canvas.draw_image_rect(
+                        foreground_snapshot,
+                        Some((&scrolled_region, SrcRectConstraint::Fast)),
+                        translated_region,
+                        &renderer.paint,
+                    );
 
                     foreground_canvas.restore();
                 }
-            },
+            }
             WindowDrawCommand::Clear => {
                 let background_canvas = self.background_surface.canvas();
-                self.background_surface = build_window_surface(background_canvas, &renderer, self.grid_width, self.grid_height);
+                self.background_surface = build_background_window_surface(
+                    background_canvas,
+                    &renderer,
+                    self.grid_width,
+                    self.grid_height,
+                );
 
                 let foreground_canvas = self.foreground_surface.canvas();
-                self.foreground_surface = build_window_surface(foreground_canvas, &renderer, self.grid_width, self.grid_height);
-            },
+                self.foreground_surface = build_window_surface(
+                    foreground_canvas,
+                    &renderer,
+                    self.grid_width,
+                    self.grid_height,
+                );
+            }
             WindowDrawCommand::Show => {
                 if self.hidden {
                     self.hidden = false;
@@ -293,7 +381,7 @@ impl RenderedWindow {
                     self.grid_start_position = self.grid_destination;
                     self.grid_destination = self.grid_destination;
                 }
-            },
+            }
             WindowDrawCommand::Hide => self.hidden = true,
             _ => {}
         };

src/settings/mod.rs

@@ -170,8 +170,7 @@ impl Settings {
                 ),
                 name
             );
-            nvim.command(&vimscript)
-                .unwrap_or_explained_panic(&format!(
+            nvim.command(&vimscript).unwrap_or_explained_panic(&format!(
                 "Could not setup setting notifier for {}",
                 name
             ));
@@ -191,31 +190,11 @@ impl Settings {
 
 #[cfg(test)]
 mod tests {
+    use neovim_lib::{Neovim, NeovimApi, Session, UiAttachOptions};
 
     use super::*;
 
     use crate::bridge::create_nvim_command;
-    use async_trait::async_trait;
-    use nvim_rs::create::tokio as create;
-    use nvim_rs::{compat::tokio::Compat, Handler, Neovim};
-
-    #[derive(Clone)]
-    pub struct NeovimHandler();
-
-    #[async_trait]
-    impl Handler for NeovimHandler {
-        type Writer = Compat<ChildStdin>;
-
-        async fn handle_notify(
-            &self,
-            _event_name: String,
-            _arguments: Vec<Value>,
-            _neovim: Neovim<Compat<ChildStdin>>,
-        ) {
-        }
-    }
-
-    use tokio;
 
     #[test]
     fn test_set_setting_handlers() {
@@ -288,8 +267,8 @@ mod tests {
         assert_eq!(v2, r2);
     }
 
-    #[tokio::test]
-    async fn test_read_initial_values() {
+    #[test]
+    fn test_read_initial_values() {
         let settings = Settings::new();
 
         let v1: String = "foo".to_string();
@@ -298,12 +277,12 @@ mod tests {
         let v4: String = format!("neovide_{}", v1);
         let v5: String = format!("neovide_{}", v2);
 
-        let (nvim, _, _) = create::new_child_cmd(&mut create_nvim_command(), NeovimHandler())
-            .await
-            .unwrap_or_explained_panic("Could not locate or start the neovim process");
+        let mut session = Session::new_child_cmd(&mut create_nvim_command())
+            .unwrap_or_explained_panic("Could not locate or start neovim process");
+        session.start_event_loop_channel();
+        let mut nvim = Neovim::new(session);
 
-        nvim.set_var(&v4, Value::from(v2.clone())).await.ok();
-        println!("v4 set");
+        nvim.set_var(&v4, Value::from(v2.clone())).unwrap();
 
         fn noop_update(_v: Value) {}
 
@@ -327,10 +306,10 @@ mod tests {
             settings.readers.force_unlock_write();
         }
 
-        settings.read_initial_values(&nvim).await;
+        settings.read_initial_values(&mut nvim);
 
-        let rt1 = nvim.get_var(&v4).await.unwrap();
-        let rt2 = nvim.get_var(&v5).await.unwrap();
+        let rt1 = nvim.get_var(&v4).unwrap();
+        let rt2 = nvim.get_var(&v5).unwrap();
 
         let r1 = rt1.as_str().unwrap();
         let r2 = rt2.as_str().unwrap();

src/window.rs

@@ -1,28 +1,28 @@
+use std::sync::atomic::{AtomicBool, Ordering};
+use std::sync::mpsc::{Receiver, Sender};
+use std::sync::Arc;
 use std::thread::sleep;
 use std::time::{Duration, Instant};
-use std::sync::Arc;
-use std::sync::atomic::{Ordering, AtomicBool};
-use std::sync::mpsc::{Sender, Receiver};
 
-use log::{debug, error, warn, info, trace};
+use log::{debug, error, info, trace, warn};
+use skulpin::ash::prelude::VkResult;
 use skulpin::sdl2;
 use skulpin::sdl2::event::{Event, WindowEvent};
 use skulpin::sdl2::keyboard::Keycode;
 use skulpin::sdl2::video::FullscreenType;
 use skulpin::sdl2::Sdl;
-use skulpin::ash::prelude::VkResult;
 use skulpin::{
     CoordinateSystem, LogicalSize, PhysicalSize, PresentMode, Renderer as SkulpinRenderer,
     RendererBuilder, Sdl2Window, Window,
 };
 
-use crate::editor::{DrawCommand, WindowCommand};
 use crate::bridge::{produce_neovim_keybinding_string, UiCommand};
+use crate::editor::{DrawCommand, WindowCommand};
+use crate::error_handling::ResultPanicExplanation;
 use crate::redraw_scheduler::REDRAW_SCHEDULER;
 use crate::renderer::Renderer;
 use crate::settings::*;
 use crate::INITIAL_DIMENSIONS;
-use crate::error_handling::ResultPanicExplanation;
 
 #[derive(RustEmbed)]
 #[folder = "assets/"]
@@ -37,15 +37,21 @@ fn windows_fix_dpi() {
     }
 }
 
-fn handle_new_grid_size(new_size: LogicalSize, renderer: &Renderer, ui_command_sender: &Sender<UiCommand>) {
+fn handle_new_grid_size(
+    new_size: LogicalSize,
+    renderer: &Renderer,
+    ui_command_sender: &Sender<UiCommand>,
+) {
     if new_size.width > 0 && new_size.height > 0 {
         let new_width = ((new_size.width + 1) as f32 / renderer.font_width) as u32;
         let new_height = ((new_size.height + 1) as f32 / renderer.font_height) as u32;
         // Add 1 here to make sure resizing doesn't change the grid size on startup
-        ui_command_sender.send(UiCommand::Resize {
+        ui_command_sender
+            .send(UiCommand::Resize {
                 width: new_width,
                 height: new_height,
-        }).ok();
+            })
+            .ok();
     }
 }
 
@@ -65,7 +71,7 @@ struct WindowWrapper {
     cached_size: (u32, u32),
     cached_position: (i32, i32),
     ui_command_sender: Sender<UiCommand>,
-    running: Arc<AtomicBool>
+    running: Arc<AtomicBool>,
 }
 
 pub fn window_geometry() -> Result<(u64, u64), String> {
@@ -111,7 +117,11 @@ pub fn window_geometry_or_default() -> (u64, u64) {
 }
 
 impl WindowWrapper {
-    pub fn new(ui_command_sender: Sender<UiCommand>, draw_command_receiver: Receiver<DrawCommand>, running: Arc<AtomicBool>) -> WindowWrapper {
+    pub fn new(
+        ui_command_sender: Sender<UiCommand>,
+        batched_draw_command_receiver: Receiver<Vec<DrawCommand>>,
+        running: Arc<AtomicBool>,
+    ) -> WindowWrapper {
         let context = sdl2::init().expect("Failed to initialize sdl2");
         let video_subsystem = context
             .video()
@@ -120,7 +130,7 @@ impl WindowWrapper {
 
         let (width, height) = window_geometry_or_default();
 
-        let renderer = Renderer::new(draw_command_receiver);
+        let renderer = Renderer::new(batched_draw_command_receiver);
         let logical_size = LogicalSize {
             width: (width as f32 * renderer.font_width) as u32,
             height: (height as f32 * renderer.font_height + 1.0) as u32,
@@ -172,7 +182,7 @@ impl WindowWrapper {
             cached_size: (0, 0),
             cached_position: (0, 0),
             ui_command_sender,
-            running
+            running,
         }
     }
 
@@ -270,7 +280,9 @@ impl WindowWrapper {
 
         if let Some(keybinding_string) = produce_neovim_keybinding_string(keycode, text, modifiers)
         {
-            self.ui_command_sender.send(UiCommand::Keyboard(keybinding_string)).unwrap_or_explained_panic(
+            self.ui_command_sender
+                .send(UiCommand::Keyboard(keybinding_string))
+                .unwrap_or_explained_panic(
                     "Could not send UI command from the window system to the neovim process.",
                 );
         }
@@ -279,19 +291,25 @@ impl WindowWrapper {
     pub fn handle_pointer_motion(&mut self, x: i32, y: i32) {
         let previous_position = self.mouse_position;
         let sdl_window_wrapper = Sdl2Window::new(&self.window);
-        let logical_position = PhysicalSize::new(x as u32, y as u32)
-            .to_logical(sdl_window_wrapper.scale_factor());
+        let logical_position =
+            PhysicalSize::new(x as u32, y as u32).to_logical(sdl_window_wrapper.scale_factor());
 
         let mut top_window_position = (0.0, 0.0);
         let mut top_grid_position = None;
 
         for (grid_id, window_region) in self.renderer.window_regions.iter() {
-            if logical_position.width >= window_region.left as u32 && logical_position.width < window_region.right as u32 &&
-                logical_position.height >= window_region.top as u32 && logical_position.height < window_region.bottom as u32 {
+            if logical_position.width >= window_region.left as u32
+                && logical_position.width < window_region.right as u32
+                && logical_position.height >= window_region.top as u32
+                && logical_position.height < window_region.bottom as u32
+            {
                 top_window_position = (window_region.left, window_region.top);
                 top_grid_position = Some((
                     grid_id,
-                    LogicalSize::new(logical_position.width - window_region.left as u32, logical_position.height - window_region.top as u32)
+                    LogicalSize::new(
+                        logical_position.width - window_region.left as u32,
+                        logical_position.height - window_region.top as u32,
+                    ),
                 ));
             }
         }
@@ -300,40 +318,48 @@ impl WindowWrapper {
             self.grid_id_under_mouse = *grid_id;
             self.mouse_position = LogicalSize::new(
                 (grid_position.width as f32 / self.renderer.font_width) as u32,
-                (grid_position.height as f32 / self.renderer.font_height) as u32
+                (grid_position.height as f32 / self.renderer.font_height) as u32,
             );
 
             if self.mouse_enabled && self.mouse_down && previous_position != self.mouse_position {
                 let (window_left, window_top) = top_window_position;
-                let adjusted_drag_left = self.mouse_position.width + (window_left / self.renderer.font_width) as u32;
-                let adjusted_drag_top = self.mouse_position.height + (window_top / self.renderer.font_height) as u32;
+                let adjusted_drag_left =
+                    self.mouse_position.width + (window_left / self.renderer.font_width) as u32;
+                let adjusted_drag_top =
+                    self.mouse_position.height + (window_top / self.renderer.font_height) as u32;
 
-                self.ui_command_sender.send(UiCommand::Drag {
+                self.ui_command_sender
+                    .send(UiCommand::Drag {
                         grid_id: self.grid_id_under_mouse,
                         position: (adjusted_drag_left, adjusted_drag_top),
-                }).ok();
+                    })
+                    .ok();
             }
         }
     }
 
     pub fn handle_pointer_down(&mut self) {
         if self.mouse_enabled {
-            self.ui_command_sender.send(UiCommand::MouseButton {
+            self.ui_command_sender
+                .send(UiCommand::MouseButton {
                     action: String::from("press"),
                     grid_id: self.grid_id_under_mouse,
                     position: (self.mouse_position.width, self.mouse_position.height),
-            }).ok();
+                })
+                .ok();
         }
         self.mouse_down = true;
     }
 
     pub fn handle_pointer_up(&mut self) {
         if self.mouse_enabled {
-            self.ui_command_sender.send(UiCommand::MouseButton {
+            self.ui_command_sender
+                .send(UiCommand::MouseButton {
                     action: String::from("release"),
                     grid_id: self.grid_id_under_mouse,
                     position: (self.mouse_position.width, self.mouse_position.height),
-            }).ok();
+                })
+                .ok();
         }
         self.mouse_down = false;
     }
@@ -350,11 +376,13 @@ impl WindowWrapper {
         };
 
         if let Some(input_type) = vertical_input_type {
-            self.ui_command_sender.send(UiCommand::Scroll {
+            self.ui_command_sender
+                .send(UiCommand::Scroll {
                     direction: input_type.to_string(),
                     grid_id: self.grid_id_under_mouse,
                     position: (self.mouse_position.width, self.mouse_position.height),
-            }).ok();
+                })
+                .ok();
         }
 
         let horizontal_input_type = match y {
@@ -364,11 +392,13 @@ impl WindowWrapper {
         };
 
         if let Some(input_type) = horizontal_input_type {
-            self.ui_command_sender.send(UiCommand::Scroll {
+            self.ui_command_sender
+                .send(UiCommand::Scroll {
                     direction: input_type.to_string(),
                     grid_id: self.grid_id_under_mouse,
                     position: (self.mouse_position.width, self.mouse_position.height),
-            }).ok();
+                })
+                .ok();
         }
     }
 
@@ -396,12 +426,14 @@ impl WindowWrapper {
 
         if REDRAW_SCHEDULER.should_draw() || SETTINGS.get::<WindowSettings>().no_idle {
             let renderer = &mut self.renderer;
-            self.skulpin_renderer
-                .draw(&sdl_window_wrapper, |canvas, coordinate_system_helper| {
+            self.skulpin_renderer.draw(
+                &sdl_window_wrapper,
+                |canvas, coordinate_system_helper| {
                     if renderer.draw_frame(canvas, &coordinate_system_helper, dt) {
                         handle_new_grid_size(current_size, &renderer, &ui_command_sender);
                     }
-                })?;
+                },
+            )?;
 
             Ok(true)
         } else {
@@ -436,8 +468,17 @@ pub fn initialize_settings() {
     register_nvim_setting!("fullscreen", WindowSettings::fullscreen);
 }
 
-pub fn start_window(draw_command_receiver: Receiver<DrawCommand>, window_command_receiver: Receiver<WindowCommand>, ui_command_sender: Sender<UiCommand>, running: Arc<AtomicBool>) {
-    let mut window = WindowWrapper::new(ui_command_sender.clone(), draw_command_receiver, running.clone());
+pub fn start_window(
+    batched_draw_command_receiver: Receiver<Vec<DrawCommand>>,
+    window_command_receiver: Receiver<WindowCommand>,
+    ui_command_sender: Sender<UiCommand>,
+    running: Arc<AtomicBool>,
+) {
+    let mut window = WindowWrapper::new(
+        ui_command_sender.clone(),
+        batched_draw_command_receiver,
+        running.clone(),
+    );
 
     info!("Starting window event loop");
     let mut event_pump = window
@@ -507,14 +548,16 @@ pub fn start_window(draw_command_receiver: Receiver<DrawCommand>, window_command
         for window_command in window_command_receiver.try_iter() {
             match window_command {
                 WindowCommand::TitleChanged(new_title) => window.handle_title_changed(new_title),
-                WindowCommand::SetMouseEnabled(mouse_enabled) => window.mouse_enabled = mouse_enabled,
+                WindowCommand::SetMouseEnabled(mouse_enabled) => {
+                    window.mouse_enabled = mouse_enabled
+                }
             }
         }
 
         match window.draw_frame(dt) {
             Ok(animating) => {
                 was_animating = animating;
-            },
+            }
             Err(error) => {
                 error!("Render failed: {}", error);
                 break;