1// Copyright 2018 The Go Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style
3// license that can be found in the LICENSE file.
4
5// The protoc-gen-go binary is a protoc plugin to generate Go code for
6// both proto2 and proto3 versions of the protocol buffer language.
7//
8// For more information about the usage of this plugin, see:
9//	https://developers.google.com/protocol-buffers/docs/reference/go-generated
10package main
11
12import (
13	"errors"
14	"flag"
15	"fmt"
16	"os"
17	"path/filepath"
18
19	gengo "google.golang.org/protobuf/cmd/protoc-gen-go/internal_gengo"
20	"google.golang.org/protobuf/compiler/protogen"
21	"google.golang.org/protobuf/internal/version"
22)
23
24const genGoDocURL = "https://developers.google.com/protocol-buffers/docs/reference/go-generated"
25const grpcDocURL = "https://grpc.io/docs/languages/go/quickstart/#regenerate-grpc-code"
26
27func main() {
28	if len(os.Args) == 2 && os.Args[1] == "--version" {
29		fmt.Fprintf(os.Stdout, "%v %v\n", filepath.Base(os.Args[0]), version.String())
30		os.Exit(0)
31	}
32	if len(os.Args) == 2 && os.Args[1] == "--help" {
33		fmt.Fprintf(os.Stdout, "See "+genGoDocURL+" for usage information.\n")
34		os.Exit(0)
35	}
36
37	var (
38		flags   flag.FlagSet
39		plugins = flags.String("plugins", "", "deprecated option")
40	)
41	protogen.Options{
42		ParamFunc: flags.Set,
43	}.Run(func(gen *protogen.Plugin) error {
44		if *plugins != "" {
45			return errors.New("protoc-gen-go: plugins are not supported; use 'protoc --go-grpc_out=...' to generate gRPC\n\n" +
46				"See " + grpcDocURL + " for more information.")
47		}
48		for _, f := range gen.Files {
49			if f.Generate {
50				gengo.GenerateFile(gen, f)
51			}
52		}
53		gen.SupportedFeatures = gengo.SupportedFeatures
54		return nil
55	})
56}
57