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Expand on hidelines documentation.

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Eric Huss 2023-05-28 13:50:34 -07:00
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guide/src/format/mdbook.md
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## Hiding code lines
There is a feature in mdBook that lets you hide code lines by prepending them
with a `#` [like you would with Rustdoc][rustdoc-hide].
There is a feature in mdBook that lets you hide code lines by prepending them with a specific prefix.
[rustdoc-hide]: https://doc.rust-lang.org/stable/rustdoc/documentation-tests.html#hiding-portions-of-the-example
For the Rust language, you can use the `#` character as a prefix which will hide lines [like you would with Rustdoc][rustdoc-hide].
[rustdoc-hide]: https://doc.rust-lang.org/stable/rustdoc/write-documentation/documentation-tests.html#hiding-portions-of-the-example
```bash
# fn main() {
@ -27,7 +28,7 @@ Will render as
# }
```
The code block has an eyeball icon (<i class="fa fa-eye"></i>) which will toggle the visibility of the hidden lines.
When you tap or hover the mouse over the code block, there will be an eyeball icon (<i class="fa fa-eye"></i>) which will toggle the visibility of the hidden lines.
By default, this only works for code examples that are annotated with `rust`.
However, you can define custom prefixes for other languages by adding a new line-hiding prefix in your `book.toml` with the language name and prefix character(s):
@ -59,7 +60,7 @@ nothidden():
This behavior can be overridden locally with a different prefix. This has the same effect as above:
~~~bash
~~~markdown
```python,hidelines=!!!
!!!hidden()
nothidden():