vendor/github.com/gogo/protobuf/protoc-min-version/minversion.go

// Protocol Buffers for Go with Gadgets
//
// Copyright (c) 2013, The GoGo Authors. All rights reserved.
// http://github.com/gogo/protobuf
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

package main

import (
	"fmt"
	"os"
	"os/exec"
	"strings"

	"github.com/gogo/protobuf/version"
)

func filter(ss []string, flag string) ([]string, string) {
	s := make([]string, 0, len(ss))
	var v string
	for i := range ss {
		if strings.Contains(ss[i], flag) {
			vs := strings.Split(ss[i], "=")
			v = vs[1]
			continue
		}
		s = append(s, ss[i])
	}
	return s, v
}

func main() {
	args, min := filter(os.Args[1:], "-version")
	if !version.AtLeast(min) {
		fmt.Printf("protoc version not high enough to parse this proto file\n")
		return
	}
	gen := exec.Command("protoc", args...)
	gen.Stderr = os.Stderr
	gen.Stdout = os.Stdout
	err := gen.Run()
	if err != nil {
		panic(err)
	}
}