hugo/resources/page/page_outputformat.go

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// 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 page contains the core interfaces and types for the Page resource,
// a core component in Hugo.
package page
import (
"strings"
"github.com/gohugoio/hugo/media"
"github.com/gohugoio/hugo/output"
)
// OutputFormats holds a list of the relevant output formats for a given page.
type OutputFormats []OutputFormat
// OutputFormat links to a representation of a resource.
type OutputFormat struct {
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// Rel contains a value that can be used to construct a rel link.
// This is value is fetched from the output format definition.
// Note that for pages with only one output format,
// this method will always return "canonical".
// As an example, the AMP output format will, by default, return "amphtml".
//
// See:
// https://www.ampproject.org/docs/guides/deploy/discovery
//
// Most other output formats will have "alternate" as value for this.
Rel string
Format output.Format
relPermalink string
permalink string
}
// Name returns this OutputFormat's name, i.e. HTML, AMP, JSON etc.
func (o OutputFormat) Name() string {
return o.Format.Name
}
// MediaType returns this OutputFormat's MediaType (MIME type).
func (o OutputFormat) MediaType() media.Type {
return o.Format.MediaType
}
// Permalink returns the absolute permalink to this output format.
func (o OutputFormat) Permalink() string {
return o.permalink
}
// RelPermalink returns the relative permalink to this output format.
func (o OutputFormat) RelPermalink() string {
return o.relPermalink
}
func NewOutputFormat(relPermalink, permalink string, isCanonical bool, f output.Format) OutputFormat {
isUserConfigured := true
for _, d := range output.DefaultFormats {
if strings.EqualFold(d.Name, f.Name) {
isUserConfigured = false
}
}
rel := f.Rel
// If the output format is the canonical format for the content, we want
// to specify this in the "rel" attribute of an HTML "link" element.
// However, for custom output formats, we don't want to surprise users by
// overwriting "rel"
if isCanonical && !isUserConfigured {
rel = "canonical"
}
return OutputFormat{Rel: rel, Format: f, relPermalink: relPermalink, permalink: permalink}
}
// Get gets a OutputFormat given its name, i.e. json, html etc.
// It returns nil if none found.
func (o OutputFormats) Get(name string) *OutputFormat {
for _, f := range o {
if strings.EqualFold(f.Format.Name, name) {
return &f
}
}
return nil
}