Add --go-module-name flag to support generating Go module compatible code (#7651)

* Add --go-module-name flag to support generating code for go modules

* Rename echo example folder

* Grammar

* Update readme for go-echo example

* Update readme for go-echo example

* Re-enable go modules after test is done

examples/go-echo/net/Request.go

@@ -0,0 +1,82 @@
+// Code generated by the FlatBuffers compiler. DO NOT EDIT.
+
+package net
+
+import (
+	flatbuffers "github.com/google/flatbuffers/go"
+
+	hero "echo/hero"
+)
+
+type RequestT struct {
+	Player *hero.WarriorT `json:"player"`
+}
+
+func (t *RequestT) Pack(builder *flatbuffers.Builder) flatbuffers.UOffsetT {
+	if t == nil { return 0 }
+	playerOffset := t.Player.Pack(builder)
+	RequestStart(builder)
+	RequestAddPlayer(builder, playerOffset)
+	return RequestEnd(builder)
+}
+
+func (rcv *Request) UnPackTo(t *RequestT) {
+	t.Player = rcv.Player(nil).UnPack()
+}
+
+func (rcv *Request) UnPack() *RequestT {
+	if rcv == nil { return nil }
+	t := &RequestT{}
+	rcv.UnPackTo(t)
+	return t
+}
+
+type Request struct {
+	_tab flatbuffers.Table
+}
+
+func GetRootAsRequest(buf []byte, offset flatbuffers.UOffsetT) *Request {
+	n := flatbuffers.GetUOffsetT(buf[offset:])
+	x := &Request{}
+	x.Init(buf, n+offset)
+	return x
+}
+
+func GetSizePrefixedRootAsRequest(buf []byte, offset flatbuffers.UOffsetT) *Request {
+	n := flatbuffers.GetUOffsetT(buf[offset+flatbuffers.SizeUint32:])
+	x := &Request{}
+	x.Init(buf, n+offset+flatbuffers.SizeUint32)
+	return x
+}
+
+func (rcv *Request) Init(buf []byte, i flatbuffers.UOffsetT) {
+	rcv._tab.Bytes = buf
+	rcv._tab.Pos = i
+}
+
+func (rcv *Request) Table() flatbuffers.Table {
+	return rcv._tab
+}
+
+func (rcv *Request) Player(obj *hero.Warrior) *hero.Warrior {
+	o := flatbuffers.UOffsetT(rcv._tab.Offset(4))
+	if o != 0 {
+		x := rcv._tab.Indirect(o + rcv._tab.Pos)
+		if obj == nil {
+			obj = new(hero.Warrior)
+		}
+		obj.Init(rcv._tab.Bytes, x)
+		return obj
+	}
+	return nil
+}
+
+func RequestStart(builder *flatbuffers.Builder) {
+	builder.StartObject(1)
+}
+func RequestAddPlayer(builder *flatbuffers.Builder, player flatbuffers.UOffsetT) {
+	builder.PrependUOffsetTSlot(0, flatbuffers.UOffsetT(player), 0)
+}
+func RequestEnd(builder *flatbuffers.Builder) flatbuffers.UOffsetT {
+	return builder.EndObject()
+}

examples/go-echo/net/Response.go

@@ -0,0 +1,82 @@
+// Code generated by the FlatBuffers compiler. DO NOT EDIT.
+
+package net
+
+import (
+	flatbuffers "github.com/google/flatbuffers/go"
+
+	hero "echo/hero"
+)
+
+type ResponseT struct {
+	Player *hero.WarriorT `json:"player"`
+}
+
+func (t *ResponseT) Pack(builder *flatbuffers.Builder) flatbuffers.UOffsetT {
+	if t == nil { return 0 }
+	playerOffset := t.Player.Pack(builder)
+	ResponseStart(builder)
+	ResponseAddPlayer(builder, playerOffset)
+	return ResponseEnd(builder)
+}
+
+func (rcv *Response) UnPackTo(t *ResponseT) {
+	t.Player = rcv.Player(nil).UnPack()
+}
+
+func (rcv *Response) UnPack() *ResponseT {
+	if rcv == nil { return nil }
+	t := &ResponseT{}
+	rcv.UnPackTo(t)
+	return t
+}
+
+type Response struct {
+	_tab flatbuffers.Table
+}
+
+func GetRootAsResponse(buf []byte, offset flatbuffers.UOffsetT) *Response {
+	n := flatbuffers.GetUOffsetT(buf[offset:])
+	x := &Response{}
+	x.Init(buf, n+offset)
+	return x
+}
+
+func GetSizePrefixedRootAsResponse(buf []byte, offset flatbuffers.UOffsetT) *Response {
+	n := flatbuffers.GetUOffsetT(buf[offset+flatbuffers.SizeUint32:])
+	x := &Response{}
+	x.Init(buf, n+offset+flatbuffers.SizeUint32)
+	return x
+}
+
+func (rcv *Response) Init(buf []byte, i flatbuffers.UOffsetT) {
+	rcv._tab.Bytes = buf
+	rcv._tab.Pos = i
+}
+
+func (rcv *Response) Table() flatbuffers.Table {
+	return rcv._tab
+}
+
+func (rcv *Response) Player(obj *hero.Warrior) *hero.Warrior {
+	o := flatbuffers.UOffsetT(rcv._tab.Offset(4))
+	if o != 0 {
+		x := rcv._tab.Indirect(o + rcv._tab.Pos)
+		if obj == nil {
+			obj = new(hero.Warrior)
+		}
+		obj.Init(rcv._tab.Bytes, x)
+		return obj
+	}
+	return nil
+}
+
+func ResponseStart(builder *flatbuffers.Builder) {
+	builder.StartObject(1)
+}
+func ResponseAddPlayer(builder *flatbuffers.Builder, player flatbuffers.UOffsetT) {
+	builder.PrependUOffsetTSlot(0, flatbuffers.UOffsetT(player), 0)
+}
+func ResponseEnd(builder *flatbuffers.Builder) flatbuffers.UOffsetT {
+	return builder.EndObject()
+}