initial implementation of bufferline (#2759)

* initial implementation of bufferline

* fixed lint

* changed to 'bufferline', added enum for config modes, some cleanup

* fixed lint

* added file modification indicator

* removed redundant code, added proper themeing with fallback, changed 'file modified' indicator

* remove commented code

* Update helix-term/src/ui/editor.rs

simplify text and offset computation

Co-authored-by: Gokul Soumya <gokulps15@gmail.com>

* add ui.bufferline.background key for themes

Co-authored-by: lazytanuki <43273245+lazytanuki@users.noreply.github.com>

* address PR comments

* Update helix-term/src/ui/editor.rs

* simplify computation of editor area:

* change to set_stringn to avoid overflow

* Update configuration.md

Updates documentation to reflect decision re: defaulting to never showing bufferline.

* addressed pr comments

* fix build error

* address pr comments

* revert accidental change

Co-authored-by: Gokul Soumya <gokulps15@gmail.com>
Co-authored-by: lazytanuki <43273245+lazytanuki@users.noreply.github.com>
Co-authored-by: Seth Bromberger <sbromberger@users.noreply.github.com>

1 files changed, 21 insertions, 0 deletions

diff --git a/helix-view/src/editor.rs b/helix-view/src/editor.rs
index ed1813b3..65e64b16 100644
--- a/helix-view/src/editor.rs
+++ b/helix-view/src/editor.rs
@@ -162,6 +162,8 @@ pub struct Config {
     pub rulers: Vec<u16>,
     #[serde(default)]
     pub whitespace: WhitespaceConfig,
+    /// Persistently display open buffers along the top
+    pub bufferline: BufferLine,
     /// Vertical indent width guides.
     pub indent_guides: IndentGuidesConfig,
     /// Whether to color modes with different colors. Defaults to `false`.
@@ -367,6 +369,24 @@ impl Default for CursorShapeConfig {
     }
 }
 
+/// bufferline render modes
+#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
+#[serde(rename_all = "kebab-case")]
+pub enum BufferLine {
+    /// Don't render bufferline
+    Never,
+    /// Always render
+    Always,
+    /// Only if multiple buffers are open
+    Multiple,
+}
+
+impl Default for BufferLine {
+    fn default() -> Self {
+        BufferLine::Never
+    }
+}
+
 #[derive(Debug, Copy, Clone, PartialEq, Eq, Serialize, Deserialize)]
 #[serde(rename_all = "kebab-case")]
 pub enum LineNumber {
@@ -554,6 +574,7 @@ impl Default for Config {
             terminal: get_terminal_provider(),
             rulers: Vec::new(),
             whitespace: WhitespaceConfig::default(),
+            bufferline: BufferLine::default(),
             indent_guides: IndentGuidesConfig::default(),
             color_modes: false,
         }