hugo/markup/converter/converter.go
Bjørn Erik Pedersen 90da7664bf Add page fragments support to Related
The main topic of this commit is that you can now index fragments (content heading identifiers) when calling `.Related`.

You can do this by:

* Configure one or more indices with type `fragments`
* The name of those index configurations maps to an (optional) front matter slice with fragment references. This allows you to link
page<->fragment and page<->page.
* This also will index all the fragments (heading identifiers) of the pages.

It's also possible to use type `fragments` indices in shortcode, e.g.:

```
{{ $related := site.RegularPages.Related .Page }}
```

But, and this is important, you need to include the shortcode using the `{{<` delimiter. Not doing so will create infinite loops and timeouts.

This commit also:

* Adds two new methods to Page: Fragments (can also be used to build ToC) and HeadingsFiltered (this is only used in Related Content with
index type `fragments` and `enableFilter` set to true.
* Consolidates all `.Related*` methods into one, which takes either a `Page` or an options map as its only argument.
* Add `context.Context` to all of the content related Page API. Turns out it wasn't strictly needed for this particular feature, but it will
soon become usefil, e.g. in #9339.

Closes #10711
Updates #9339
Updates #10725
2023-02-21 17:56:41 +01:00

140 lines
3.7 KiB
Go

// 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 converter
import (
"bytes"
"github.com/gohugoio/hugo/common/hexec"
"github.com/gohugoio/hugo/common/loggers"
"github.com/gohugoio/hugo/config"
"github.com/gohugoio/hugo/identity"
"github.com/gohugoio/hugo/markup/converter/hooks"
"github.com/gohugoio/hugo/markup/highlight"
"github.com/gohugoio/hugo/markup/markup_config"
"github.com/gohugoio/hugo/markup/tableofcontents"
"github.com/spf13/afero"
)
// ProviderConfig configures a new Provider.
type ProviderConfig struct {
MarkupConfig markup_config.Config
Cfg config.Provider // Site config
ContentFs afero.Fs
Logger loggers.Logger
Exec *hexec.Exec
highlight.Highlighter
}
// ProviderProvider creates converter providers.
type ProviderProvider interface {
New(cfg ProviderConfig) (Provider, error)
}
// Provider creates converters.
type Provider interface {
New(ctx DocumentContext) (Converter, error)
Name() string
}
// NewProvider creates a new Provider with the given name.
func NewProvider(name string, create func(ctx DocumentContext) (Converter, error)) Provider {
return newConverter{
name: name,
create: create,
}
}
type newConverter struct {
name string
create func(ctx DocumentContext) (Converter, error)
}
func (n newConverter) New(ctx DocumentContext) (Converter, error) {
return n.create(ctx)
}
func (n newConverter) Name() string {
return n.name
}
var NopConverter = new(nopConverter)
type nopConverter int
func (nopConverter) Convert(ctx RenderContext) (Result, error) {
return &bytes.Buffer{}, nil
}
func (nopConverter) Supports(feature identity.Identity) bool {
return false
}
// Converter wraps the Convert method that converts some markup into
// another format, e.g. Markdown to HTML.
type Converter interface {
Convert(ctx RenderContext) (Result, error)
Supports(feature identity.Identity) bool
}
// Result represents the minimum returned from Convert.
type Result interface {
Bytes() []byte
}
// DocumentInfo holds additional information provided by some converters.
type DocumentInfo interface {
AnchorSuffix() string
}
// TableOfContentsProvider provides the content as a ToC structure.
type TableOfContentsProvider interface {
TableOfContents() *tableofcontents.Fragments
}
// AnchorNameSanitizer tells how a converter sanitizes anchor names.
type AnchorNameSanitizer interface {
SanitizeAnchorName(s string) string
}
// Bytes holds a byte slice and implements the Result interface.
type Bytes []byte
// Bytes returns itself
func (b Bytes) Bytes() []byte {
return b
}
// DocumentContext holds contextual information about the document to convert.
type DocumentContext struct {
Document any // May be nil. Usually a page.Page
DocumentID string
DocumentName string
Filename string
}
// RenderContext holds contextual information about the content to render.
type RenderContext struct {
// Src is the content to render.
Src []byte
// Whether to render TableOfContents.
RenderTOC bool
// GerRenderer provides hook renderers on demand.
GetRenderer hooks.GetRendererFunc
}
var FeatureRenderHooks = identity.NewPathIdentity("markup", "renderingHooks")