add RangeFormatting

components/format.go

@@ -47,3 +47,37 @@ func Format(ctx context.Context, req *defines.DocumentFormattingParams) (result
 		},
 	}, nil
 }
+
+func FormatRange(ctx context.Context, req *defines.DocumentRangeFormattingParams) (result *[]defines.TextEdit, err error) {
+	if !view.IsProtoFile(req.TextDocument.Uri) {
+		return nil, nil
+	}
+	format := exec.Command("clang-format", fmt.Sprintf("--assume-filename=%v", filepath.Base(string(req.TextDocument.Uri))), fmt.Sprintf("--lines=%v:%v", req.Range.Start.Line+1, req.Range.End.Line+1))
+	in, err := format.StdinPipe()
+	if err != nil {
+		return nil, err
+	}
+	proto_file, err := view.ViewManager.GetFile(req.TextDocument.Uri)
+	if err != nil {
+		return nil, err
+	}
+	data, _, _ := proto_file.Read(ctx)
+	go func() {
+		io.WriteString(in, string(data))
+		defer in.Close()
+	}()
+
+	res, err := format.CombinedOutput()
+	if err != nil {
+		log.Fatal(err)
+	}
+	return &[]defines.TextEdit{
+		{
+			Range: defines.Range{
+				Start: defines.Position{Line: 0, Character: 0},
+				End:   defines.Position{Line: math.MaxInt32, Character: math.MaxInt32},
+			},
+			NewText: string(res),
+		},
+	}, nil
+}

main.go

@@ -57,5 +57,6 @@ func main() {
 	server.OnDocumentFormatting(components.Format)
 	server.OnCompletion(components.Completion)
 	server.OnHover(components.Hover)
+	server.OnDocumentRangeFormatting(components.FormatRange)
 	server.Run()
 }