add spacer element to statusline (#3165)

* add spacer element to statusline

* docs

book/src/configuration.md

@@ -78,6 +78,7 @@ ### `[editor.statusline]` Section
 | `diagnostics` | The number of warnings and/or errors |
 | `selections` | The number of active selections |
 | `position` | The cursor position |
+| `spacer` | Inserts a space between elements (multiple/contiguous spacers may be specified) |
 
 ### `[editor.lsp]` Section
 

helix-term/src/ui/statusline.rs

@@ -143,6 +143,7 @@ fn get_render_function<F>(element_id: StatusLineElementID) -> impl Fn(&mut Rende
         helix_view::editor::StatusLineElement::Diagnostics => render_diagnostics,
         helix_view::editor::StatusLineElement::Selections => render_selections,
         helix_view::editor::StatusLineElement::Position => render_position,
+        helix_view::editor::StatusLineElement::Spacer => render_spacer,
     }
 }
 
@@ -334,3 +335,10 @@ fn render_file_name<F>(context: &mut RenderContext, write: F)
 
     write(context, title, None);
 }
+
+fn render_spacer<F>(context: &mut RenderContext, write: F)
+where
+    F: Fn(&mut RenderContext, String, Option<Style>) + Copy,
+{
+    write(context, String::from(" "), None);
+}

helix-view/src/editor.rs

@@ -246,6 +246,9 @@ pub enum StatusLineElement {
 
     /// The cursor position
     Position,
+
+    /// A single space
+    Spacer,
 }
 
 // Cursor shape is read and used on every rendered frame and so needs