Struct Mermaid 

pub struct Mermaid { /* private fields */ }

Pre-render mermaid diagrams to inline SVG via the external mmdc CLI (@mermaid-js/mermaid-cli).

Two input shapes are handled:

• ```mermaid fenced code blocks - replaced with <MermaidDiagram chart="..." {mode}Svg="<svg...>" ... />.
• Author-written <MermaidDiagram chart={…} /> JSX nodes - the existing JSX node is preserved and {mode}Svg attributes are appended.

Theme behavior is driven by MermaidOptions::theme: Single("dark") renders once and emits a single chartSvg attr; Multi({ light: "default", dark: "dark" }) (the default) renders per-mode and emits lightSvg + darkSvg.

Per-block failures emit Code::MermaidRenderFailed. The CLI availability probe runs once per process; missing CLI -> the whole transformer becomes a no-op with Code::MmdcUnavailable.

Implementations

impl Mermaid

pub fn from_options(opts: MermaidOptions) -> Self

Build a Mermaid transformer with the supplied options. Use Mermaid::default() for the bundled defaults.

pub fn with_output(p: impl Into<PathBuf>) -> Self

Convenience constructor preserved for backward compat: enables the disk cache at dir.

Trait Implementations

impl Default for Mermaid

fn default() -> Self

Returns the “default value” for a type.

impl Transformer for Mermaid

fn name(&self) -> &str

Stable identifier for logging / error reporting.

fn transform( &self, doc: &mut Document, _meta: &SourceMeta, diag_engine: &mut DiagnosticEngine<Code>, )

Mutate doc in place. May be a no-op when preconditions (config, environment, feature flags) aren’t met.