merman 0.9.0

Parity-focused, headless Rust implementation of Mermaid for parsing, layout, and rendering.
Documentation 
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use merman::{OperationControl, RenderOutput, RenderRequest, Renderer, SvgRequest};
use std::io::Write as _;

const SOURCE: &str = "flowchart TD\n  A[Parse] --> B[Layout]\n  B --> C[Geometry]\n";

fn main() -> Result<(), Box<dyn std::error::Error>> {
    let renderer = Renderer::new().with_parse_options(merman::ParseOptions::strict());
    let output = renderer.render(RenderRequest::layout_json(
        SOURCE,
        OperationControl::new(),
        SvgRequest::default(),
    ))?;
    let RenderOutput::LayoutJson(Some(layout)) = output else {
        return Err("no Mermaid diagram detected".into());
    };

    let mut stdout = std::io::stdout().lock();
    layout.layout().write_json_pretty(&mut stdout)?;
    writeln!(stdout)?;
    Ok(())
}