generate errors only for generated files

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>

graphqls.go

@@ -0,0 +1,73 @@
+package main
+
+import (
+	"bytes"
+	"os"
+	"path"
+	"path/filepath"
+	"strings"
+
+	"github.com/danielvladco/go-proto-gql/pkg/generator"
+	"github.com/vektah/gqlparser/v2/formatter"
+	"google.golang.org/protobuf/compiler/protogen"
+	"google.golang.org/protobuf/proto"
+	"google.golang.org/protobuf/types/pluginpb"
+)
+
+func (g *Generator) graphqlsGenerate(plugin *protogen.Plugin) error {
+	descs, err := generator.CreateDescriptorsFromProto(plugin.Request)
+	if err != nil {
+		return err
+	}
+
+	gqlDesc, err := generator.NewSchemas(descs, true, true, plugin)
+	if err != nil {
+		return err
+	}
+
+	var outFiles []*pluginpb.CodeGeneratorResponse_File
+
+	for _, schema := range gqlDesc {
+		buf := &bytes.Buffer{}
+		formatter.NewFormatter(buf).FormatSchema(schema.AsGraphql())
+		protoFileName := schema.FileDescriptors[0].GetName()
+
+		outFiles = append(outFiles, &pluginpb.CodeGeneratorResponse_File{
+			Name:    proto.String(resolveGraphqlFilename(protoFileName)),
+			Content: proto.String(buf.String()),
+		})
+	}
+
+	res := &pluginpb.CodeGeneratorResponse{
+		File:              outFiles,
+		SupportedFeatures: proto.Uint64(uint64(pluginpb.CodeGeneratorResponse_FEATURE_PROTO3_OPTIONAL)),
+	}
+
+	if err != nil {
+		res.Error = proto.String(err.Error())
+	}
+
+	out, err := proto.Marshal(res)
+	if err != nil {
+		return err
+	}
+
+	if _, err := os.Stdout.Write(out); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func resolveGraphqlFilename(protoFileName string) string {
+	gqlFileName := "schema." + "graphqls"
+	absProtoFileName, err := filepath.Abs(protoFileName)
+	if err == nil {
+		protoDirSlice := strings.Split(filepath.Dir(absProtoFileName), string(filepath.Separator))
+		if len(protoDirSlice) > 0 {
+			gqlFileName = protoDirSlice[len(protoDirSlice)-1] + "." + "graphqls"
+		}
+	}
+	protoDir, _ := path.Split(protoFileName)
+	return path.Join(protoDir, gqlFileName)
+}