Make sure there are only one HugoInfo instance

See #570

hugolib/hugo.go

@@ -7,6 +7,8 @@ var (
 	BuildDate  string
 )
 
+var hugoInfo *HugoInfo
+
 // HugoInfo contains information about the current Hugo environment
 type HugoInfo struct {
 	Version    string
@@ -15,11 +17,14 @@ type HugoInfo struct {
 	BuildDate  string
 }
 
-func newHugoInfo() *HugoInfo {
-	return &HugoInfo{
-		Version:    Version,
-		CommitHash: CommitHash,
-		BuildDate:  BuildDate,
-		Generator:  `<meta name="generator" content="Hugo ` + Version + `" />`,
+func getHugoInfo() *HugoInfo {
+	if hugoInfo == nil {
+		hugoInfo = &HugoInfo{
+			Version:    Version,
+			CommitHash: CommitHash,
+			BuildDate:  BuildDate,
+			Generator:  `<meta name="generator" content="Hugo ` + Version + `" />`,
+		}
 	}
+	return hugoInfo
 }

hugolib/node.go

@@ -29,7 +29,6 @@ type Node struct {
 	Params      map[string]interface{}
 	Date        time.Time
 	Sitemap     Sitemap
-	hugo        *HugoInfo
 	UrlPath
 }
 
@@ -79,10 +78,7 @@ func (n *Node) IsMenuCurrent(menuId string, inme *MenuEntry) bool {
 }
 
 func (n *Node) Hugo() *HugoInfo {
-	if n.hugo == nil {
-		n.hugo = newHugoInfo()
-	}
-	return n.hugo
+	return getHugoInfo()
 }
 
 func (n *Node) isSameAsDescendantMenu(inme *MenuEntry, parent *MenuEntry) bool {