Crate funcy

Simple function based template engine.

Renders template strings with functions embedded, e.g. "<!$ echo Hello>, World" // -> "Hello, World!"

Examples

Echo

struct Echo();
impl funcy::PlaceholderFunction for Echo {
    fn placeholder_fn_handler<'a>(&mut self, _name: &'a str, arg: &'a str) -> Result<String, String> {
        Ok(arg.to_string())
    }
}

let mut tr = funcy::TemplateRenderer::with_template("<!$ echo Hello>, World!");
tr.set_placeholder_fn("echo", Box::new(Echo()));
assert_eq!(tr.render().unwrap(), "Hello, World!");

Counter

struct Counter(usize);
impl funcy::PlaceholderFunction for Counter {
    fn placeholder_fn_handler<'a>(&mut self, _name: &'a str, _arg: &'a str) -> Result<String, String> {
        self.0 += 1;
        Ok(self.0.to_string())
    }
}

let mut tr = funcy::TemplateRenderer::with_template("<!$ counter> <!$ counter> <!$ counter>");
let counter = Counter(0);
tr.set_placeholder_fn("counter", Box::new(counter));
assert_eq!(tr.render().unwrap(), "1 2 3");

Structs

TemplateRenderer

Renders Funcy template strings.

Enums

RenderError

Error returned by TemplateRenderer::render.

Traits

PlaceholderFunction

Trait used to define functions that can be called from placeholders.