feat(statusline): add option to show total line numbers in file (helix-editor#3960)

* feat(statusline): add option to show total line numbers in file

* feat(line numbers): add config to doc book

Author: 0xfourzerofour

book/src/configuration.md

@@ -93,6 +93,7 @@ The following statusline elements can be configured:
 | `file-name` | The path/name of the opened file |
 | `file-encoding` | The encoding of the opened file if it differs from UTF-8 |
 | `file-line-ending` | The file line endings (CRLF or LF) |
+| `total-line-numbers` | The total line numbers of the opened file |
 | `file-type` | The type of the opened file |
 | `diagnostics` | The number of warnings and/or errors |
 | `selections` | The number of active selections |

helix-term/src/ui/statusline.rs

@@ -144,6 +144,7 @@ where
         helix_view::editor::StatusLineElement::Selections => render_selections,
         helix_view::editor::StatusLineElement::Position => render_position,
         helix_view::editor::StatusLineElement::PositionPercentage => render_position_percentage,
+        helix_view::editor::StatusLineElement::TotalLineNumbers => render_total_line_numbers,
         helix_view::editor::StatusLineElement::Separator => render_separator,
         helix_view::editor::StatusLineElement::Spacer => render_spacer,
     }
@@ -276,6 +277,15 @@ where
     );
 }
 
+fn render_total_line_numbers<F>(context: &mut RenderContext, write: F)
+where
+    F: Fn(&mut RenderContext, String, Option<Style>) + Copy,
+{
+    let total_line_numbers = context.doc.text().len_lines();
+
+    write(context, format!(" {} ", total_line_numbers), None);
+}
+
 fn render_position_percentage<F>(context: &mut RenderContext, write: F)
 where
     F: Fn(&mut RenderContext, String, Option<Style>) + Copy,

helix-view/src/editor.rs

@@ -331,6 +331,9 @@ pub enum StatusLineElement {
     /// The cursor position as a percent of the total file
     PositionPercentage,
 
+    /// The total line numbers of the current file
+    TotalLineNumbers,
+
     /// A single space
     Spacer,
 }