You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: description.go
    path of file: ./repos/gitkube/vendor/github.com/gogo/protobuf/plugin/description
    
    the code of the file until where you have to start completion: // 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.

/*
The description (experimental) plugin generates a Description method for each message.
The Description method returns a populated google_protobuf.FileDescriptorSet struct.
This contains the description of the files used to generate this message.

It is enabled by the following extensions:

  - description
  - description_all

The description plugin also generates a test given it is enabled using one of the following extensions:

  - testgen
  - testgen_all

Let us look at:

  github.com/gogo/protobuf/test/example/example.proto

Btw all the output can be seen at:

  github.com/gogo/protobuf/test/example/*

The following message:

  message B {
	option (gogoproto.description) = true;
	optional A A = 1 [(gogoproto.nulla
    
func (p *plugin) Generate(file *generator.FileDescriptor) {
	used := false
	localName := generator.FileName(file)

	p.PluginImports = generator.NewPluginImports(p.Generator)
	descriptorPkg := p.NewImport("github.com/gogo/protobuf/protoc-gen-gogo/descriptor")
	protoPkg := p.NewImport("github.com/gogo/protobuf/proto")
	gzipPkg := p.NewImport("compress/gzip")
	bytesPkg := p.NewImport("bytes")
	ioutilPkg := p.NewImport("io/ioutil")

	for _, message := range file.Messages() {
		if !gogoproto.HasDescription(file.FileDescriptorProto, message.DescriptorProto) {
			continue
		}
		if message.DescriptorProto.GetOptions().GetMapEntry() {
			continue
		}
		used = true
		ccTypeName := generator.CamelCaseSlice(message.TypeName())
		p.P(`func (this *`, ccTypeName, `) Description() (desc *`, descriptorPkg.Use(), `.FileDescriptorSet) {`)
		p.In()
		p.P(`return `, localName, `Description()`)
		p.Out()
		p.P(`}`)
	}

	if used {

		p.P(`func `, localName, `Description() (desc *`, descriptorPkg.Use(), `.FileDescriptorSet) {`)
		p.In()
		//Don't generate SourceCodeInfo, since it will create too much code.

		ss := make([]*descriptor.SourceCodeInfo, 0)
		for _, f := range p.Generator.AllFiles().GetFile() {
			ss = append(ss, f.SourceCodeInfo)
			f.SourceCodeInfo = nil
		}
		b, err := proto.Marshal(p.Generator.AllFiles())
		if err != nil {
			panic(err)
		}
		for i, f := range p.Generator.AllFiles().GetFile() {
			f.SourceCodeInfo = ss[i]
		}
		p.P(`d := &`, descriptorPkg.Use(), `.FileDescriptorSet{}`)
		var buf bytes.Buffer
		w, _ := gzip.NewWriterLevel(&buf, gzip.BestCompression)
		w.Write(b)
		w.Close()
		b = buf.Bytes()
		p.P("var gzipped = []byte{")
		p.In()
		p.P("// ", len(b), " bytes of a gzipped FileDescriptorSet")
		for len(b) > 0 {
			n := 16
			if n > len(b) {
				n = len(b)
			}

			s := ""
			for _, c := range b[:n] {
				s += fmt.Sprintf("0x%02x,", c)
			}
			p.P(s)

			b = b[n:]
		}
		p.Out()
		p.P("}")
		p.P(`r := `, bytesPkg.Use(), `.NewReader(gzipped)`)
		p.P(`gzipr, err := `, gzipPkg.Use(), `.NewReader(r)`)
		p.P(`if err != nil {`)
		p.In()
		p.P(`panic(err)`)
		p.Out()
		p.P(`}`)
		p.P(`ungzipped, err := `, ioutilPkg.Use(), `.ReadAll(gzipr)`)
		p.P(`if err != nil {`)
		p.In()
		p.P(`panic(err)`)
		p.Out()
		p.P(`}`)
		p.P(`if err := `, protoPkg.Use(), `.Unmarshal(ungzipped, d); err != nil {`)
		p.In()
		p.P(`panic(err)`)
		p.Out()
		p.P(`}`)
		p.P(`return d`)
		p.Out()
		p.P(`}`)
	}
}