feat: support format range code

server/src/deno.ts

@@ -62,7 +62,7 @@ class Deno {
       let stdout = "";
       let stderr = "";
       subprocess.on("exit", (exitCode: number) => {
-        if (exitCode != 0) {
+        if (exitCode !== 0 || stderr) {
           reject(new Error(stderr));
         } else {
           resolve(stdout);

server/src/language/document_formatting.ts

@@ -29,15 +29,7 @@ export class DocumentFormatting {
 
       const cwd = workspaceFolder ? workspaceFolder.uri.fsPath : "./";
 
-      connection.console.log(
-        `Formatting '${uri.toString()}' at ${
-          workspaceFolder ? workspaceFolder.uri.fsPath : ""
-        }`
-      );
-
-      const formatted = await deno.format(text, {
-        cwd
-      });
+      const formatted = await deno.format(text, { cwd });
 
       const start = doc.positionAt(0);
       const end = doc.positionAt(text.length);
@@ -46,5 +38,27 @@ export class DocumentFormatting {
 
       return [TextEdit.replace(range, formatted)];
     });
+
+    connection.onDocumentRangeFormatting(async params => {
+      const uri = params.textDocument.uri;
+      const range = params.range;
+      const doc = documents.get(uri);
+
+      if (!doc) {
+        return;
+      }
+
+      const text = doc.getText(range);
+
+      const workspaceFolder = await bridge.getWorkspace(uri);
+
+      const cwd = workspaceFolder ? workspaceFolder.uri.fsPath : "./";
+
+      const formatted = await deno.format(text, { cwd });
+
+      // why trim it?
+      // Because we are just formatting some of them, we don't need to keep the trailing \n
+      return [TextEdit.replace(range, formatted.trim())];
+    });
   }
 }

server/src/server.ts

@@ -57,6 +57,7 @@ connection.onInitialize(
     return {
       capabilities: {
         documentFormattingProvider: true,
+        documentRangeFormattingProvider: true,
         textDocumentSync: {
           openClose: true,
           change: TextDocumentSyncKind.Full