Add file indentation style for statusline (#13632)

book/src/editor.md

@@ -133,6 +133,7 @@ The following statusline elements can be configured:
 | `file-modification-indicator` | The indicator to show whether the file is modified (a `[+]` appears when there are unsaved changes) |
 | `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-indent-style` | The file indentation style |
 | `read-only-indicator` | An indicator that shows `[readonly]` when a file cannot be written |
 | `total-line-numbers` | The total line numbers of the opened file |
 | `file-type` | The type of the opened file |

helix-term/src/ui/statusline.rs

@@ -1,5 +1,6 @@
 use std::borrow::Cow;
 
+use helix_core::indent::IndentStyle;
 use helix_core::{coords_at_pos, encoding, Position};
 use helix_lsp::lsp::DiagnosticSeverity;
 use helix_view::document::DEFAULT_LANGUAGE_NAME;
@@ -142,6 +143,7 @@ where
         helix_view::editor::StatusLineElement::ReadOnlyIndicator => render_read_only_indicator,
         helix_view::editor::StatusLineElement::FileEncoding => render_file_encoding,
         helix_view::editor::StatusLineElement::FileLineEnding => render_file_line_ending,
+        helix_view::editor::StatusLineElement::FileIndentStyle => render_file_indent_style,
         helix_view::editor::StatusLineElement::FileType => render_file_type,
         helix_view::editor::StatusLineElement::Diagnostics => render_diagnostics,
         helix_view::editor::StatusLineElement::WorkspaceDiagnostics => render_workspace_diagnostics,
@@ -554,3 +556,20 @@ where
         write(context, format!(" reg={} ", reg).into())
     }
 }
+
+fn render_file_indent_style<'a, F>(context: &mut RenderContext<'a>, write: F)
+where
+    F: Fn(&mut RenderContext<'a>, Span<'a>) + Copy,
+{
+    let style = context.doc.indent_style;
+
+    write(
+        context,
+        match style {
+            IndentStyle::Tabs => " tabs ".into(),
+            IndentStyle::Spaces(indent) => {
+                format!(" {} space{} ", indent, if indent == 1 { "" } else { "s" }).into()
+            }
+        },
+    );
+}

helix-view/src/editor.rs

@@ -580,6 +580,9 @@ pub enum StatusLineElement {
     /// The file line endings (CRLF or LF)
     FileLineEnding,
 
+    /// The file indentation style
+    FileIndentStyle,
+
     /// The file type (language ID or "text")
     FileType,