41 lines
1.2 KiB
Rust
41 lines
1.2 KiB
Rust
use crate::prelude::*;
|
|
|
|
/// Exposes a value to the query system without producing visible content.
|
|
///
|
|
/// This element can be retrieved with the [`query`]($query) function and from
|
|
/// the command with [`typst query`]($reference/meta/query/#cli-queries). Its
|
|
/// purpose is to expose an arbitrary value to the introspection system. To
|
|
/// identify a metadata value among others, you can attach a [`label`]($label)
|
|
/// to it and query for that label.
|
|
///
|
|
/// The `metadata` element is especially useful for command line queries because
|
|
/// it allows you to expose arbitrary values to the outside world.
|
|
///
|
|
/// ```example
|
|
/// // Put metadata somewhere.
|
|
/// #metadata("This is a note") <note>
|
|
///
|
|
/// // And find it from anywhere else.
|
|
/// #locate(loc => {
|
|
/// query(<note>, loc).first().value
|
|
/// })
|
|
/// ```
|
|
#[elem(Behave, Show, Locatable)]
|
|
pub struct MetadataElem {
|
|
/// The value to embed into the document.
|
|
#[required]
|
|
pub value: Value,
|
|
}
|
|
|
|
impl Show for MetadataElem {
|
|
fn show(&self, _vt: &mut Vt, _styles: StyleChain) -> SourceResult<Content> {
|
|
Ok(Content::empty())
|
|
}
|
|
}
|
|
|
|
impl Behave for MetadataElem {
|
|
fn behaviour(&self) -> Behaviour {
|
|
Behaviour::Invisible
|
|
}
|
|
}
|