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https://github.com/abhinav/goldmark-anchor
Generates anchors next to headings in a Markdown document.
https://github.com/abhinav/goldmark-anchor
goldmark markdown
Last synced: about 2 months ago
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Generates anchors next to headings in a Markdown document.
- Host: GitHub
- URL: https://github.com/abhinav/goldmark-anchor
- Owner: abhinav
- License: bsd-3-clause
- Created: 2023-02-04T23:36:00.000Z (almost 2 years ago)
- Default Branch: main
- Last Pushed: 2024-10-30T12:14:14.000Z (about 2 months ago)
- Last Synced: 2024-11-02T11:11:38.849Z (about 2 months ago)
- Topics: goldmark, markdown
- Language: Go
- Homepage: https://abhinav.github.io/goldmark-anchor/
- Size: 99.6 KB
- Stars: 7
- Watchers: 2
- Forks: 0
- Open Issues: 1
-
Metadata Files:
- Readme: README.md
- Changelog: CHANGELOG.md
- License: LICENSE
Awesome Lists containing this project
README
# goldmark-anchor
[](https://pkg.go.dev/go.abhg.dev/goldmark/anchor)
[](https://github.com/abhinav/goldmark-anchor/actions/workflows/ci.yml)
[](https://codecov.io/gh/abhinav/goldmark-anchor)
goldmark-anchor is an extension for the [goldmark] Markdown parser
that adds support for anchors next to all headers.
[goldmark]: http://github.com/yuin/goldmark
**Demo**:
A web-based demonstration of the extension is available at
.
## Installation
```bash
go get go.abhg.dev/goldmark/anchor@latest
```
## Usage
To use goldmark-anchor, import the `anchor` package.
```go
import "go.abhg.dev/goldmark/anchor"
```
Then include the `anchor.Extender` in the list of extensions
when constructing your [`goldmark.Markdown`].
[`goldmark.Markdown`]: https://pkg.go.dev/github.com/yuin/goldmark#Markdown
```go
goldmark.New(
goldmark.WithParserOptions(
parser.WithAutoHeadingID(), // read note
),
goldmark.WithExtensions(
// ...
&anchor.Extender{},
),
).Convert(src, out)
```
This will begin adding '¶' anchors next to all headers in your Markdown files.
> **NOTE**:
> The example above adds the `parser.WithAutoHeadingID` option.
> Without this, or a custom implementation of `parser.IDs`,
> Goldmark will not add `id` attributes to headers.
> If a header does not have an `id`,
> then goldmark-anchor will not generate an anchor for it.
### Changing anchor text
Change the anchor text by setting the `Texter` field
of the `Extender` to an `anchor.Text` value.
```go
&anchor.Extender{
Texter: anchor.Text("#"),
}
```
#### Dynamic anchor text
You can dynamically calculate anchor text
by supplying a custom implementation of `Texter`
to the `Extender`.
For example, the following `Texter` repeats '#' matching the header level,
providing anchors similar to Markdown `#`-style headers.
```go
type customTexter struct{}
func (*customTexter) AnchorText(h *anchor.HeaderInfo) []byte {
return bytes.Repeat([]byte{'#'}, h.Level)
}
// Elsewhere:
&anchor.Extender{
Texter: &customTexter{},
}
```
### Skipping headers
To skip headers, supply a custom `Texter` that returns an empty output
for the `AnchorText` method.
The following `Texter` will not render anchors for level 1 headers.
```go
type customTexter struct{}
func (*customTexter) AnchorText(h *anchor.HeaderInfo) []byte {
if h.Level == 1 {
return nil
}
return []byte("#")
}
```
### Changing anchor attributes
Change the anchor attributes by setting the `Attributer` field
of the `Extender`.
```go
&anchor.Extender{
Attributer: anchor.Attributes{
"class": "permalink",
},
}
```
By default, goldmark-anchor will add `class="anchor"` to all anchors.
Set `Attributer` to `anchor.Attributes{}` to disable this.
```go
&anchor.Extender{
Attributer: anchor.Attributes{},
}
```
### Changing anchor positioning
Anchors can appear either at the start of the header before the header text,
or at the end after the header text.
```html
# Foo
Foo ¶
```
You can choose the placement by setting the `Position` field of `Extender`.
```go
&anchor.Extender{
Position: anchor.Before, // or anchor.After
}
```
By default, goldmark-anchor will place anchors after the header text.
## FAQ
### Why are no anchors being generated?
By default, Goldmark does not generate IDs for headings.
Since goldmark-anchor generates anchors only for headings with IDs,
this can result in no anchors being generated
You must enable heading ID generation using one of the following methods:
- set the [`parser.WithAutoHeadingID`] option
- supply your own [`parser.IDs`] implementation
Alternatively, if your document specifies heading attributes manually,
enable the [`parser.WithHeadingAttribute`] option and manually specify
heading IDs next to each heading.
[`parser.WithAutoHeadingID`]: https://pkg.go.dev/github.com/yuin/goldmark/parser#WithAutoHeadingID
[`parser.IDs`]: https://pkg.go.dev/github.com/yuin/goldmark/parser#IDs
[`parser.WithHeadingAttribute`]: https://pkg.go.dev/github.com/yuin/goldmark/parser#WithHeadingAttribute
## License
This software is made available under the BSD3 license.