Allow different names for swagger specs

gen/gen.go

@@ -309,6 +309,6 @@ func (s *s) ReadDoc() string {
 }
 
 func init() {
-	swag.Register(swag.Name, &s{})
+	swag.Register({{ printf "%q + %q" .Host .BasePath}}, &s{})
 }
 `

swagger.go

@@ -2,6 +2,7 @@ package swag
 
 import (
 	"errors"
+	"fmt"
 	"sync"
 )
 
@@ -10,7 +11,7 @@ const Name = "swagger"
 
 var (
 	swaggerMu sync.RWMutex
-	swag      Swagger
+	swags     map[string]Swagger
 )
 
 // Swagger is a interface to read swagger document.
@@ -22,20 +23,33 @@ type Swagger interface {
 func Register(name string, swagger Swagger) {
 	swaggerMu.Lock()
 	defer swaggerMu.Unlock()
+
 	if swagger == nil {
 		panic("swagger is nil")
 	}
 
-	if swag != nil {
+	if swags == nil {
+		swags = make(map[string]Swagger)
+	}
+
+	if _, ok := swags[name]; ok {
 		panic("Register called twice for swag: " + name)
 	}
-	swag = swagger
+	swags[name] = swagger
 }
 
 // ReadDoc reads swagger document.
 func ReadDoc() (string, error) {
-	if swag != nil {
+	return ReadDocName(Name)
+}
+
+// ReadDocName reads swagger document with specific name.
+func ReadDocName(name string) (string, error) {
+	if swags == nil {
+		return "", errors.New("no swag has yet been registered")
+	} else if swag, ok := swags[name]; !ok {
+		return "", fmt.Errorf("no swag named \"%s\" was registered", name)
+	} else {
 		return swag.ReadDoc(), nil
 	}
-	return "", errors.New("not yet registered swag")
 }

swagger_test.go

@@ -185,5 +185,5 @@ func TestCalledTwicelRegister(t *testing.T) {
 }
 
 func setup() {
-	swag = nil
+	swags = make(map[string]Swagger)
 }