Simplify Enums from JSONMarshaler to TextMarshaler interface (#29)

* Simplify Enums from JSONMarshaler to TextMarshaler interface

Compared to JSONMarshaler interface, this removes:
1. an extra bytes.NewBufferString() buffer during the marshaling
2. an extra json.Unmarshal() call during the unmarshaling
3. need for "bytes" import in the server-only code

* Regenerate examples

Author: VojtechVitek

_examples/golang-basics/example.gen.go

@@ -31,20 +31,12 @@ func (x {{$name}}) String() string {
 	return {{$name}}_name[{{$type}}(x)]
 }
 
-func (x {{$name}}) MarshalJSON() ([]byte, error) {
-	buf := bytes.NewBufferString(`"`)
-	buf.WriteString({{$name}}_name[{{$type}}(x)])
-	buf.WriteString(`"`)
-	return buf.Bytes(), nil
+func (x Status) MarshalText() ([]byte, error) {
+	return []byte({{$name}}_name[{{$type}}(x)]), nil
 }
 
-func (x *{{$name}}) UnmarshalJSON(b []byte) error {
-	var j string
-	err := json.Unmarshal(b, &j)
-	if err != nil {
-		return err
-	}
-	*x = {{$name}}({{$name}}_value[j])
+func (x *{{$name}}) UnmarshalText(b []byte) error {
+	*x = {{$name}}({{$name}}_value[string(b)])
 	return nil
 }
 

_examples/golang-imports/api.gen.go

@@ -14,11 +14,8 @@
 	{{- set $stdlibImports "encoding/json" "" -}}
 {{- end -}}
 
-{{- if or $opts.client (not $opts.types) }}
-	{{- set $stdlibImports "bytes" "" -}}
-{{- end -}}
-
 {{- if $opts.client }}
+	{{- set $stdlibImports "bytes" "" -}}
 	{{- set $stdlibImports "io" "" -}}
 	{{- set $stdlibImports "net/url" "" -}}
 {{- end -}}