Opinionated to scrolling

book/src/configuration.md

@@ -59,26 +59,13 @@ Its settings will be merged with the configuration directory `config.toml` and t
 | `true-color` | Set to `true` to override automatic detection of terminal truecolor support in the event of a false negative | `false` |
 | `undercurl` | Set to `true` to override automatic detection of terminal undercurl support in the event of a false negative | `false` |
 | `rulers` | List of column positions at which to display the rulers. Can be overridden by language specific `rulers` in `languages.toml` file | `[]` |
+| `bufferline` | Renders a line at the top of the editor displaying open buffers. Can be `always`, `never` or `multiple` (only shown if more than one buffer is in use) | `never` |
 | `color-modes` | Whether to color the mode indicator with different colors depending on the mode itself | `false` |
 | `text-width` | Maximum line length. Used for the `:reflow` command and soft-wrapping if `soft-wrap.wrap-at-text-width` is set | `80` |
 | `workspace-lsp-roots` | Directories relative to the workspace root that are treated as LSP roots. Should only be set in `.helix/config.toml` | `[]` |
 | `default-line-ending` | The line ending to use for new documents. Can be `native`, `lf`, `crlf`, `ff`, `cr` or `nel`. `native` uses the platform's native line ending (`crlf` on Windows, otherwise `lf`). | `native` |
 | `insert-final-newline` | Whether to automatically insert a trailing line-ending on write if missing | `true` |
 
-### `[editor.bufferline]` Section
-
-Allows configuring the bufferline at the top of the editor.
-
-```toml
-[editor.bufferline]
-show = "always"
-style = "scroll"
-```
-
-| Key     | Description | Default |
-| ---     | ---         | ---     |
-| `show`  | Can be `always`, `never` or `multiple` (only shown if more than one buffer is in use) | `never` |
-| `style` | Can be `overflow`, `wrap` or `scroll`. | `overflow` |
 
 ### `[editor.statusline]` Section
 

helix-term/src/ui/editor.rs

@@ -23,7 +23,7 @@ use helix_core::{
 };
 use helix_view::{
     document::{Mode, SavePoint, SCRATCH_BUFFER_NAME},
-    editor::{BufferLine, BufferLineStyle, CompleteAction, CursorShapeConfig},
+    editor::{BufferLine, CompleteAction, CursorShapeConfig},
     graphics::{Color, CursorKind, Modifier, Rect, Style},
     input::{KeyEvent, MouseButton, MouseEvent, MouseEventKind},
     keyboard::{KeyCode, KeyModifiers},
@@ -64,7 +64,6 @@ pub struct BufferTab {
     text: String,
     width: u16,
     x: i32,
-    y: i32,
     style: Style,
 }
 
@@ -530,24 +529,7 @@ impl EditorView {
     }
 
     /// Render bufferline at the top
-    pub fn render_bufferline(
-        editor: &Editor,
-        viewport: Rect,
-        surface: &mut Surface,
-        config: BufferLine,
-    ) -> u16 {
-        // check if bufferline should be rendered
-        use helix_view::editor::BufferLineShow;
-        let use_bufferline = match config.show {
-            BufferLineShow::Always => true,
-            BufferLineShow::Multiple if editor.documents.len() > 1 => true,
-            _ => false,
-        };
-
-        if !use_bufferline {
-            return 0;
-        }
-
+    pub fn render_bufferline(editor: &Editor, viewport: Rect, surface: &mut Surface) {
         // Define styles
         let bufferline_active = editor
             .theme
@@ -560,7 +542,6 @@ impl EditorView {
             .unwrap_or_else(|| editor.theme.get("ui.statusline.inactive"));
 
         let mut x = viewport.x as i32;
-        let mut y = viewport.y as i32;
         let current_doc = view!(editor).doc;
 
         // Gather info on buffertabs
@@ -587,28 +568,16 @@ impl EditorView {
             let text = format!(" {}{} ", fname, if doc.is_modified() { "[+]" } else { "" });
             let text_width = text.grapheme_indices(true).count();
 
-            if config.style == BufferLineStyle::Wrap
-                && x.saturating_add(text_width as i32) >= viewport.right() as i32
-            {
-                y = y.saturating_add(1);
-                x = viewport.x as _;
-            }
-
             buffertabs.push(BufferTab {
                 active,
                 text,
                 width: text_width as _,
                 x,
-                y,
                 style,
             });
             x = x.saturating_add(text_width as _);
         }
 
-        let height =
-            (if x != 0 { y.saturating_add(1) } else { y } as u16).saturating_sub(viewport.y);
-
-        let viewport = viewport.with_height(height);
         surface.clear_with(
             viewport,
             editor
@@ -617,31 +586,29 @@ impl EditorView {
                 .unwrap_or_else(|| editor.theme.get("ui.statusline")),
         );
 
-        if config.style == BufferLineStyle::Scroll {
-            let viewport_center = (viewport.width as f64 / 2.).floor() as i32 + viewport.x as i32;
+        // Scroll the tabs correctly
+        let viewport_center = (viewport.width as f64 / 2.).floor() as i32 + viewport.x as i32;
 
-            let active_buffertab = buffertabs.iter().find(|tab| tab.active).unwrap();
+        let active_buffertab = buffertabs.iter().find(|tab| tab.active).unwrap();
 
-            let active_buffertab_center =
-                (active_buffertab.width as f64 / 2.).floor() as i32 + active_buffertab.x;
+        let active_buffertab_center =
+            (active_buffertab.width as f64 / 2.).floor() as i32 + active_buffertab.x;
 
-            let right_of_center = active_buffertab_center as i32 - viewport_center as i32;
+        let right_of_center = active_buffertab_center as i32 - viewport_center as i32;
 
-            if right_of_center > 0 {
-                let rightmost = buffertabs.last().unwrap();
-                let full_width = rightmost.x + rightmost.width as i32;
+        if right_of_center > 0 {
+            let rightmost = buffertabs.last().unwrap();
+            let full_width = rightmost.x + rightmost.width as i32;
 
-                let max_displacement = (full_width - viewport.width as i32).max(0);
-                let displacement = right_of_center.min(max_displacement);
+            let max_displacement = (full_width - viewport.width as i32).max(0);
+            let displacement = right_of_center.min(max_displacement);
 
-                for tab in buffertabs.iter_mut() {
-                    tab.x = tab.x.saturating_sub(displacement.abs());
-                }
-            } // If on center, or left of center, nothing to do
-        }
+            for tab in buffertabs.iter_mut() {
+                tab.x = tab.x.saturating_sub(displacement.abs());
+            }
+        } // If on center, or left of center, nothing to do
 
         // Itterate over buffertabs, skip or slice them if left off screen, stop if right of screen.
-        // If wrapping no buffers will go off screen and all are drawn.
         for tab in buffertabs.iter_mut() {
             if tab.x < viewport.x as i32 {
                 if tab.x + tab.width as i32 > viewport.x as i32 {
@@ -671,15 +638,13 @@ impl EditorView {
             let _ = surface
                 .set_stringn(
                     tab.x as _,
-                    tab.y as _,
+                    viewport.y,
                     tab.text.clone(),
                     (viewport.right() as usize).saturating_sub(tab.x as _),
                     tab.style,
                 )
                 .0;
         }
-
-        height
     }
 
     pub fn render_gutter<'d>(
@@ -1511,15 +1476,26 @@ impl Component for EditorView {
         surface.set_style(area, cx.editor.theme.get("ui.background"));
         let config = cx.editor.config();
 
+        // check if bufferline should be rendered
+        let use_bufferline = match config.bufferline {
+            BufferLine::Always => true,
+            BufferLine::Multiple if cx.editor.documents.len() > 1 => true,
+            _ => false,
+        };
+
         // -1 for commandline and -1 for bufferline
         let mut editor_area = area.clip_bottom(1);
-        let buffer_line_height =
-            Self::render_bufferline(cx.editor, area, surface, config.bufferline.clone());
-        editor_area = editor_area.clip_top(buffer_line_height);
+        if use_bufferline {
+            editor_area = editor_area.clip_top(1);
+        }
 
         // if the terminal size suddenly changed, we need to trigger a resize
         cx.editor.resize(editor_area);
 
+        if use_bufferline {
+            Self::render_bufferline(cx.editor, area.with_height(1), surface);
+        }
+
         for (view, is_focused) in cx.editor.tree.views() {
             let doc = cx.editor.document(view.doc).unwrap();
             self.render_view(cx.editor, doc, view, area, surface, is_focused);

helix-view/src/editor.rs

@@ -576,20 +576,10 @@ impl Default for CursorShapeConfig {
     }
 }
 
-/// bufferline configuration
-#[derive(Debug, Default, Clone, PartialEq, Eq, Serialize, Deserialize)]
-#[serde(rename_all = "kebab-case", default, deny_unknown_fields)]
-pub struct BufferLine {
-    // Set when to show the bufferline
-    pub show: BufferLineShow,
-    // Set how to handle overflowing
-    pub style: BufferLineStyle,
-}
-
 /// bufferline render modes
 #[derive(Debug, Default, Clone, PartialEq, Eq, Serialize, Deserialize)]
 #[serde(rename_all = "kebab-case")]
-pub enum BufferLineShow {
+pub enum BufferLine {
     /// Don't render bufferline
     #[default]
     Never,
@@ -599,19 +589,6 @@ pub enum BufferLineShow {
     Multiple,
 }
 
-/// bufferline render style
-#[derive(Debug, Default, Clone, PartialEq, Eq, Serialize, Deserialize)]
-#[serde(rename_all = "kebab-case")]
-pub enum BufferLineStyle {
-    /// Overflow bufferline on the right
-    #[default]
-    Overflow,
-    /// Wrap when the bufferline overflows
-    Wrap,
-    /// Scroll active buffer as centered in the bufferline as possible
-    Scroll,
-}
-
 #[derive(Debug, Copy, Clone, PartialEq, Eq, Serialize, Deserialize)]
 #[serde(rename_all = "kebab-case")]
 pub enum LineNumber {