hugolib: Add a PageOutput wrapper for rendering

hugolib/page_output.go

@@ -0,0 +1,40 @@
+// Copyright 2017 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 (
+	"github.com/spf13/hugo/output"
+)
+
+// PageOutput represents one of potentially many output formats of a given
+// Page.
+type PageOutput struct {
+	*Page
+
+	outputType output.Type
+}
+
+func newPageOutput(p *Page, outputType output.Type) *PageOutput {
+	// TODO(bep) output avoid copy of first?
+	p = p.copy()
+	return &PageOutput{Page: p, outputType: outputType}
+}
+
+// copy creates a copy of this PageOutput with the lazy sync.Once vars reset
+// so they will be evaluated again, for word count calculations etc.
+func (p *PageOutput) copy() *PageOutput {
+	c := *p
+	c.Page = p.Page.copy()
+	return &c
+}