vega_lite_5 0.8.0

use vega_lite_5::*;

fn main() -> Result<(), Box<dyn std::error::Error>> {
    // the chart
    let chart = Vegalite {
        title: Some(TitleUnion::String("Stock price".to_string())),
        description: Some("Google's stock price over time.".to_string()),
        data: RemovableValue::Specified(UrlData {
            url: Some("https://vega.github.io/vega-datasets/data/stocks.csv".to_string()),
            ..Default::default()
        }),
        transform: Some(vec![Transform {
            filter: Some(
                ConditionalValueDefNumberExprRefPredicateComposition::String(
                    "datum.symbol==='GOOG'".to_string(),
                ),
            ),
            ..Default::default()
        }]),
        mark: Some(AnyMark::Enum(Mark::Line)),
        encoding: Some(Box::new(EdEncoding {
            x: Some(XClass {
                field: Some(Field::String("date".to_string())),
                position_def_type: Some(Type::Temporal),
                ..Default::default()
            }),
            y: Some(YClass {
                field: Some(Field::String("price".to_string())),
                position_def_type: Some(Type::Quantitative),
                ..Default::default()
            }),
            ..Default::default()
        })),
        ..Default::default()
    };

    // display the chart using `showata`
    chart.show()?;

    // print the vega lite spec
    eprint!("{}", chart.to_string()?);

    Ok(())
}