Struct EmailRenderer 

pub struct EmailRenderer { /* private fields */ }

Holds a Tera engine plus per-instance rendering helpers.

Cheap to clone (the inner Tera is wrapped in Arc internally when shared across handlers — pass Arc<EmailRenderer> if you want to avoid the Tera clone cost).

Implementations

impl EmailRenderer

pub fn from_dir(dir: impl AsRef<Path>) -> Result<Self, EmailRenderError>

Load every *.txt, *.html, *.subject.txt under dir. Subdirectories are walked.

Errors

Returns the underlying Tera error when a template doesn’t parse, or the directory glob can’t be evaluated.

pub fn from_pairs(pairs: Vec<(&str, &str)>) -> Result<Self, EmailRenderError>

Build from in-memory (name, source) pairs. Useful for tests and one-off scripts that don’t want a templates dir.

Errors

Returns the underlying Tera error if a template doesn’t parse.

pub fn tera(&self) -> &Tera

Borrow the inner Tera. Useful when you want to register custom filters / functions.

pub fn tera_mut(&mut self) -> &mut Tera

Mutable borrow for filter/function registration at startup.

pub fn render( &self, name: &str, context: &Context, ) -> Result<Email, EmailRenderError>

Render {name}.subject.txt, {name}.txt, and (optionally) {name}.html and pack them into an Email. The returned email has only subject, body, and html_body populated — chain .to() / .from() / etc. before sending.

Errors

Missing(name) when subject or text body is absent; Tera(_) for any template error.