1 files changed, 74 insertions, 0 deletions
diff --git a/hugolib/page__menus.go b/hugolib/page__menus.go
new file mode 100644
index 000000000..0c9616a6d
--- /dev/null
+++ b/hugolib/page__menus.go
@@ -0,0 +1,74 @@
+// Copyright 2019 The Hugo Authors. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package hugolib
+
+import (
+	"sync"
+
+	"github.com/gohugoio/hugo/navigation"
+)
+
+type pageMenus struct {
+	p *pageState
+
+	q navigation.MenyQueryProvider
+
+	pmInit sync.Once
+	pm     navigation.PageMenus
+}
+
+func (p *pageMenus) HasMenuCurrent(menuID string, me *navigation.MenuEntry) bool {
+	p.p.s.init.menus.Do()
+	p.init()
+	return p.q.HasMenuCurrent(menuID, me)
+}
+
+func (p *pageMenus) IsMenuCurrent(menuID string, inme *navigation.MenuEntry) bool {
+	p.p.s.init.menus.Do()
+	p.init()
+	return p.q.IsMenuCurrent(menuID, inme)
+}
+
+func (p *pageMenus) Menus() navigation.PageMenus {
+	// There is a reverse dependency here. initMenus will, once, build the
+	// site menus and update any relevant page.
+	p.p.s.init.menus.Do()
+
+	return p.menus()
+}
+
+func (p *pageMenus) menus() navigation.PageMenus {
+	p.init()
+	return p.pm
+
+}
+
+func (p *pageMenus) init() {
+	p.pmInit.Do(func() {
+		p.q = navigation.NewMenuQueryProvider(
+			p.p.s.Info.sectionPagesMenu,
+			p,
+			p.p.s,
+			p.p,
+		)
+
+		var err error
+		p.pm, err = navigation.PageMenusFromPage(p.p)
+		if err != nil {
+			p.p.s.Log.ERROR.Println(p.p.wrapError(err))
+		}
+
+	})
+
+}