Struct Template 

pub struct Template { /* private fields */ }

A simple template engine for prompt templates.

Templates use {{VARIABLE}} syntax for placeholders and {{> partial}} for including shared templates. Variables are replaced with the provided values. Comments using {# comment #} syntax are stripped.

Example

let partials = HashMap::from([("header", "Common Header\n")]);
let template = Template::new("{{> header}}\nReview this diff:\n{{DIFF}}");
let variables = HashMap::from([("DIFF", "+ new line")]);
let rendered = template.render_with_partials(&variables, &partials)?;

Implementations

impl Template

pub fn new(content: &str) -> Self

Create a template from a string.

Comments ({# ... #}) are stripped during creation. All features are enabled by default: variables, conditionals, loops, and defaults.

impl Template

pub fn render( &self, variables: &HashMap<&str, String>, ) -> Result<String, TemplateError>

Render the template with the provided variables.

Errors

Returns error if the operation fails.

pub fn render_with_partials( &self, variables: &HashMap<&str, String>, partials: &HashMap<String, String>, ) -> Result<String, TemplateError>

Render the template with variables and partials support.

Partials are processed recursively, with the same variables passed to each partial. Circular references are detected and reported with a clear error.

Errors

Returns error if the operation fails.

pub fn render_with_log( &self, template_name: &str, variables: &HashMap<&str, String>, partials: &HashMap<String, String>, ) -> Result<RenderedTemplate, TemplateError>

Render the template with variables and partials, returning substitution log.

This is the primary method for reducer-integrated rendering. It returns both the rendered content and a detailed log of all substitutions, enabling validation based on what was actually substituted rather than regex scanning.

Errors

Returns error if the operation fails.

Trait Implementations

impl Clone for Template

fn clone(&self) -> Template

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Template

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.