Statusline indicator to show number of selected chars

Feature request: #4624

helix-term/src/ui/statusline.rs

@@ -142,6 +142,7 @@ where
         helix_view::editor::StatusLineElement::FileType => render_file_type,
         helix_view::editor::StatusLineElement::Diagnostics => render_diagnostics,
         helix_view::editor::StatusLineElement::Selections => render_selections,
+        helix_view::editor::StatusLineElement::TotalCharsSelected => render_total_chars_selected,
         helix_view::editor::StatusLineElement::Position => render_position,
         helix_view::editor::StatusLineElement::PositionPercentage => render_position_percentage,
         helix_view::editor::StatusLineElement::TotalLineNumbers => render_total_line_numbers,
@@ -254,6 +255,21 @@ where
     );
 }
 
+fn render_total_chars_selected<F>(context: &mut RenderContext, write: F)
+where
+    F: Fn(&mut RenderContext, String, Option<Style>) + Copy,
+{
+    let tot_sel = context
+        .doc
+        .selections()
+        .get(&context.view.id)
+        .unwrap()
+        .ranges()[0]
+        .len();
+
+    write(context, format!(" {} ", tot_sel), None);
+}
+
 fn get_position(context: &RenderContext) -> Position {
     coords_at_pos(
         context.doc.text().slice(..),

helix-view/src/editor.rs

@@ -276,7 +276,13 @@ impl Default for StatusLineConfig {
         Self {
             left: vec![E::Mode, E::Spinner, E::FileName],
             center: vec![],
-            right: vec![E::Diagnostics, E::Selections, E::Position, E::FileEncoding],
+            right: vec![
+                E::Diagnostics,
+                E::Selections,
+                E::TotalCharsSelected,
+                E::Position,
+                E::FileEncoding
+            ],
             separator: String::from("│"),
             mode: ModeConfig::default(),
         }
@@ -328,6 +334,9 @@ pub enum StatusLineElement {
     /// The number of selections (cursors)
     Selections,
 
+    /// The number of chars highlighted
+    TotalCharsSelected,
+
     /// The cursor position
     Position,