Add statusline element 'file-indexer'

book/src/configuration.md

@@ -100,6 +100,7 @@ The following statusline elements can be configured:
 | `file-base-name` | The basename 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) |
+| `file-count` | The number of open files and current index |
 | `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 |

helix-term/src/ui/statusline.rs

@@ -144,6 +144,7 @@ where
         helix_view::editor::StatusLineElement::FileEncoding => render_file_encoding,
         helix_view::editor::StatusLineElement::FileLineEnding => render_file_line_ending,
         helix_view::editor::StatusLineElement::FileType => render_file_type,
+        helix_view::editor::StatusLineElement::FileCount => render_file_count,
         helix_view::editor::StatusLineElement::Diagnostics => render_diagnostics,
         helix_view::editor::StatusLineElement::WorkspaceDiagnostics => render_workspace_diagnostics,
         helix_view::editor::StatusLineElement::Selections => render_selections,
@@ -447,6 +448,21 @@ where
     write(context, title, None);
 }
 
+fn render_file_count<F>(context: &mut RenderContext, write: F)
+where
+    F: Fn(&mut RenderContext, String, Option<Style>) + Copy,
+{
+    let docs = &context.editor.documents;
+    let id = context.doc.id();
+    let index = match docs.keys().enumerate().find(|(_, &key)| key == id) {
+        Some((num, _)) => num.checked_add(1).unwrap_or(0),
+        None => 0,
+    };
+    let count = docs.len();
+
+    write(context, format!(" {}/{} ", index, count), None);
+}
+
 fn render_separator<F>(context: &mut RenderContext, write: F)
 where
     F: Fn(&mut RenderContext, String, Option<Style>) + Copy,

helix-view/src/editor.rs

@@ -329,6 +329,9 @@ pub enum StatusLineElement {
     /// The file type (language ID or "text")
     FileType,
 
+    /// The number of open files and current index
+    FileCount,
+
     /// A summary of the number of errors and warnings
     Diagnostics,