(Git) diff gutter implementation

Cargo.toml

@@ -7,6 +7,7 @@ members = [
   "helix-lsp",
   "helix-dap",
   "helix-loader",
+  "helix-vcs",
   "xtask",
 ]
 

book/src/configuration.md

@@ -46,7 +46,7 @@ on unix operating systems.
 | `line-number` | Line number display: `absolute` simply shows each line's number, while `relative` shows the distance from the current line. When unfocused or in insert mode, `relative` will still show absolute line numbers. | `absolute` |
 | `cursorline` | Highlight all lines with a cursor. | `false` |
 | `cursorcolumn` | Highlight all columns with a cursor. | `false` |
-| `gutters` | Gutters to display: Available are `diagnostics` and `line-numbers` and `spacer`, note that `diagnostics` also includes other features like breakpoints, 1-width padding will be inserted if gutters is non-empty | `["diagnostics", "spacer", "line-numbers"]` |
+| `gutters` | Gutters to display: Available are `diagnostics` and `diff` and `line-numbers` and `spacer`, note that `diagnostics` also includes other features like breakpoints, 1-width padding will be inserted if gutters is non-empty | `["diagnostics", "spacer", "line-numbers", "spacer", "diff"]` |
 | `auto-completion` | Enable automatic pop up of auto-completion. | `true` |
 | `auto-format` | Enable automatic formatting on save. | `true` |
 | `auto-save` | Enable automatic saving on focus moving away from Helix. Requires [focus event support](https://github.com/helix-editor/helix/wiki/Terminal-Support) from your terminal. | `false` |

helix-core/src/lib.rs

@@ -83,7 +83,7 @@ pub fn find_root(root: Option<&str>, root_markers: &[String]) -> std::path::Path
     top_marker.map_or(current_dir, |a| a.to_path_buf())
 }
 
-pub use ropey::{str_utils, Rope, RopeBuilder, RopeSlice};
+pub use ropey::{self, str_utils, Rope, RopeBuilder, RopeSlice};
 
 // pub use tendril::StrTendril as Tendril;
 pub use smartstring::SmartString;

helix-term/Cargo.toml

@@ -17,8 +17,10 @@ build = true
 app = true
 
 [features]
+default = ["git"]
 unicode-lines = ["helix-core/unicode-lines"]
 integration = []
+git = ["helix-vcs/git"]
 
 [[bin]]
 name = "hx"
@@ -29,6 +31,7 @@ helix-core = { version = "0.6", path = "../helix-core" }
 helix-view = { version = "0.6", path = "../helix-view" }
 helix-lsp = { version = "0.6", path = "../helix-lsp" }
 helix-dap = { version = "0.6", path = "../helix-dap" }
+helix-vcs = { version = "0.6", path = "../helix-vcs" }
 helix-loader = { version = "0.6", path = "../helix-loader" }
 
 anyhow = "1"

helix-term/src/application.rs

@@ -274,16 +274,27 @@ impl Application {
     }
 
     #[cfg(feature = "integration")]
-    fn render(&mut self) {}
+    async fn render(&mut self) {}
 
     #[cfg(not(feature = "integration"))]
-    fn render(&mut self) {
+    async fn render(&mut self) {
         let mut cx = crate::compositor::Context {
             editor: &mut self.editor,
             jobs: &mut self.jobs,
             scroll: None,
         };
 
+        // Acquire mutable access to the redraw_handle lock
+        // to ensure that there are no tasks running that want to block rendering
+        drop(cx.editor.redraw_handle.1.write().await);
+        cx.editor.needs_redraw = false;
+        {
+            // exhaust any leftover redraw notifications
+            let notify = cx.editor.redraw_handle.0.notified();
+            tokio::pin!(notify);
+            notify.enable();
+        }
+
         let area = self
             .terminal
             .autoresize()
@@ -304,7 +315,7 @@ impl Application {
     where
         S: Stream<Item = crossterm::Result<crossterm::event::Event>> + Unpin,
     {
-        self.render();
+        self.render().await;
         self.last_render = Instant::now();
 
         loop {
@@ -329,18 +340,18 @@ impl Application {
                 biased;
 
                 Some(event) = input_stream.next() => {
-                    self.handle_terminal_events(event);
+                    self.handle_terminal_events(event).await;
                 }
                 Some(signal) = self.signals.next() => {
                     self.handle_signals(signal).await;
                 }
                 Some(callback) = self.jobs.futures.next() => {
                     self.jobs.handle_callback(&mut self.editor, &mut self.compositor, callback);
-                    self.render();
+                    self.render().await;
                 }
                 Some(callback) = self.jobs.wait_futures.next() => {
                     self.jobs.handle_callback(&mut self.editor, &mut self.compositor, callback);
-                    self.render();
+                    self.render().await;
                 }
                 event = self.editor.wait_event() => {
                     let _idle_handled = self.handle_editor_event(event).await;
@@ -445,25 +456,25 @@ impl Application {
                 self.compositor.resize(area);
                 self.terminal.clear().expect("couldn't clear terminal");
 
-                self.render();
+                self.render().await;
             }
             signal::SIGUSR1 => {
                 self.refresh_config();
-                self.render();
+                self.render().await;
             }
             _ => unreachable!(),
         }
     }
 
-    pub fn handle_idle_timeout(&mut self) {
+    pub async fn handle_idle_timeout(&mut self) {
         let mut cx = crate::compositor::Context {
             editor: &mut self.editor,
             jobs: &mut self.jobs,
             scroll: None,
         };
         let should_render = self.compositor.handle_event(&Event::IdleTimeout, &mut cx);
-        if should_render {
-            self.render();
+        if should_render || self.editor.needs_redraw {
+            self.render().await;
         }
     }
 
@@ -536,31 +547,31 @@ impl Application {
         match event {
             EditorEvent::DocumentSaved(event) => {
                 self.handle_document_write(event);
-                self.render();
+                self.render().await;
             }
             EditorEvent::ConfigEvent(event) => {
                 self.handle_config_events(event);
-                self.render();
+                self.render().await;
             }
             EditorEvent::LanguageServerMessage((id, call)) => {
                 self.handle_language_server_message(call, id).await;
                 // limit render calls for fast language server messages
                 let last = self.editor.language_servers.incoming.is_empty();
 
                 if last || self.last_render.elapsed() > LSP_DEADLINE {
-                    self.render();
+                    self.render().await;
                     self.last_render = Instant::now();
                 }
             }
             EditorEvent::DebuggerEvent(payload) => {
                 let needs_render = self.editor.handle_debugger_message(payload).await;
                 if needs_render {
-                    self.render();
+                    self.render().await;
                 }
             }
             EditorEvent::IdleTimer => {
                 self.editor.clear_idle_timer();
-                self.handle_idle_timeout();
+                self.handle_idle_timeout().await;
 
                 #[cfg(feature = "integration")]
                 {
@@ -572,7 +583,10 @@ impl Application {
         false
     }
 
-    pub fn handle_terminal_events(&mut self, event: Result<CrosstermEvent, crossterm::ErrorKind>) {
+    pub async fn handle_terminal_events(
+        &mut self,
+        event: Result<CrosstermEvent, crossterm::ErrorKind>,
+    ) {
         let mut cx = crate::compositor::Context {
             editor: &mut self.editor,
             jobs: &mut self.jobs,
@@ -596,7 +610,7 @@ impl Application {
         };
 
         if should_redraw && !self.editor.should_close() {
-            self.render();
+            self.render().await;
         }
     }
 

helix-term/src/commands/typed.rs

@@ -1028,10 +1028,12 @@ fn reload(
     }
 
     let scrolloff = cx.editor.config().scrolloff;
+    let redraw_handle = cx.editor.redraw_handle.clone();
     let (view, doc) = current!(cx.editor);
-    doc.reload(view).map(|_| {
-        view.ensure_cursor_in_view(doc, scrolloff);
-    })
+    doc.reload(view, &cx.editor.diff_providers, redraw_handle)
+        .map(|_| {
+            view.ensure_cursor_in_view(doc, scrolloff);
+        })
 }
 
 fn reload_all(
@@ -1066,7 +1068,8 @@ fn reload_all(
 
         // Every doc is guaranteed to have at least 1 view at this point.
         let view = view_mut!(cx.editor, view_ids[0]);
-        doc.reload(view)?;
+        let redraw_handle = cx.editor.redraw_handle.clone();
+        doc.reload(view, &cx.editor.diff_providers, redraw_handle)?;
 
         for view_id in view_ids {
             let view = view_mut!(cx.editor, view_id);

helix-term/src/ui/editor.rs

@@ -730,7 +730,7 @@ impl EditorView {
         let mut text = String::with_capacity(8);
 
         for gutter_type in view.gutters() {
-            let gutter = gutter_type.style(editor, doc, view, theme, is_focused);
+            let mut gutter = gutter_type.style(editor, doc, view, theme, is_focused);
             let width = gutter_type.width(view, doc);
             text.reserve(width); // ensure there's enough space for the gutter
             for (i, line) in (view.offset.row..(last_line + 1)).enumerate() {

helix-vcs/Cargo.toml

@@ -0,0 +1,28 @@
+[package]
+name = "helix-vcs"
+version = "0.6.0"
+authors = ["Blaž Hrastnik <blaz@mxxn.io>"]
+edition = "2021"
+license = "MPL-2.0"
+categories = ["editor"]
+repository = "https://github.com/helix-editor/helix"
+homepage = "https://helix-editor.com"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+helix-core = { version = "0.6", path = "../helix-core" }
+
+tokio = { version = "1", features = ["rt", "rt-multi-thread", "time", "sync", "parking_lot", "macros"] }
+parking_lot = "0.12"
+
+git-repository = { version = "0.26", default-features = false , optional = true }
+imara-diff = "0.1.5"
+
+log = "0.4"
+
+[features]
+git = ["git-repository"]
+
+[dev-dependencies]
+tempfile = "3.3"