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|
+++
title = "Reveal.js 3.9.0 highlighting example"
outputs = ["Reveal"]
[reveal_hugo]
theme = "white"
highlight_theme = "vs"
+++
## Multiline highlighting with Highlight.js
---
This presentation shows the use of the [new highlighting features](https://github.com/hakimel/reveal.js/blob/master/README.md#step-by-step-highlights) which were introduced with Reveal.js [v3.9.0](https://github.com/hakimel/reveal.js/releases/tag/3.9.0).
---
## Prerequisite
Disable `codeFences` in to your `config.toml` to prevent Hugo's built-in highlighting for code inside of `---` fences.
{{< highlight toml "style=github" >}}
[markup.highlight]
codeFences = false
{{< /highlight >}}
---
## Theme
Specify a theme for Highlight.js in `config.toml`
{{< highlight toml "style=github" >}}
[params.reveal_hugo]
highlight_theme = "github"
{{< /highlight >}}
---
...or in the `_index.md` front matter
{{< highlight toml "style=github" >}}
[reveal_hugo]
highlight_theme = "github"
{{< /highlight >}}
---
## Usage
The line highlighting is configured by adding `{}` immediately after the language selection of the markdown code block.
{{< highlight md >}}
```foo{}
```
{{< /highlight >}}
---
## Just line numbers
`{}`
{{< highlight md >}}
```go{}
package main
import "fmt"
func main() {
fmt.Println("Hello world!")
}
```
{{< /highlight >}}
```go{}
package main
import "fmt"
func main() {
fmt.Println("Hello world!")
}
```
---
## Highlight specific lines
`{<line numbers separated by comma>}`
{{< highlight md >}}
```go{1,3-5}
package main
import "fmt"
func main() {
fmt.Println("Hello world!")
}
```
{{< /highlight >}}
```go{1,3-5}
package main
import "fmt"
func main() {
fmt.Println("Hello world!")
}
```
---
## Multi step highlight
`{<line numbers separated by pipe>}`
{{< highlight md >}}
```go{1|2|3-5}
package main
import "fmt"
func main() {
fmt.Println("Hello world!")
}
```
{{< /highlight >}}
```go{1|2|3-5}
package main
import "fmt"
func main() {
fmt.Println("Hello world!")
}
```
---
## Hiding the line numbers
There is no Reveal.js parameter to use line highlighting *without* line numbers.
However it can be achieved by adding the some [custom CSS](https://github.com/dzello/reveal-hugo#adding-html-to-the-layout).
{{< highlight html "style=github" >}}
<style>
.hljs-ln-numbers {
display: none;
}
</style>
{{< /highlight >}}
---
💡 Put the custom CSS in either of these partials:
```text
# for all presentations
layouts/partials/reveal-hugo/body.html
```
```text
# for one presentation
layouts/partials/{presentation-name}/reveal-hugo/body.html
```
---
Thanks!
|
