Re-enable format_selections for a single selection range

helix-term/src/commands.rs

@@ -3748,7 +3748,7 @@ fn format_selections(cx: &mut Context) {
     let (view, doc) = current!(cx.editor);
 
     // via lsp if available
-    // else via tree-sitter indentation calculations
+    // TODO: else via tree-sitter indentation calculations
 
     let language_server = match doc.language_server() {
         Some(language_server) => language_server,
@@ -3761,33 +3761,34 @@ fn format_selections(cx: &mut Context) {
         .map(|range| range_to_lsp_range(doc.text(), *range, language_server.offset_encoding()))
         .collect();
 
-    // TODO: all of the TODO's and commented code inside the loop,
-    // to make this actually work.
-    for _range in ranges {
-        let _language_server = match doc.language_server() {
-            Some(language_server) => language_server,
-            None => return,
-        };
-        // TODO: handle fails
-        // TODO: concurrent map
+    if ranges.len() != 1 {
+        cx.editor
+            .set_error("format_selections only supports a single selection for now");
+        return;
+    }
 
-        // TODO: need to block to get the formatting
+    // TODO: handle fails
+    // TODO: concurrent map over all ranges
 
-        // let edits = block_on(language_server.text_document_range_formatting(
-        //     doc.identifier(),
-        //     range,
-        //     lsp::FormattingOptions::default(),
-        // ))
-        // .unwrap_or_default();
+    let range = ranges[0];
 
-        // let transaction = helix_lsp::util::generate_transaction_from_edits(
-        //     doc.text(),
-        //     edits,
-        //     language_server.offset_encoding(),
-        // );
+    let edits = tokio::task::block_in_place(|| {
+        helix_lsp::block_on(language_server.text_document_range_formatting(
+            doc.identifier(),
+            range,
+            lsp::FormattingOptions::default(),
+            None,
+        ))
+    })
+    .unwrap_or_default();
 
-        // apply_transaction(&transaction, doc, view);
-    }
+    let transaction = helix_lsp::util::generate_transaction_from_edits(
+        doc.text(),
+        edits,
+        language_server.offset_encoding(),
+    );
+
+    apply_transaction(&transaction, doc, view);
 }
 
 fn join_selections_inner(cx: &mut Context, select_space: bool) {