3 releases
0.1.2 | Sep 18, 2023 |
---|---|
0.1.1 | Aug 29, 2023 |
0.1.0 | Aug 11, 2023 |
#382 in Template engine
24 downloads per month
14KB
321 lines
rhai-tpl
Customizable template engine that uses rhai
for its logic.
Templating
Use <% %>
for running logic you don't want to write to the template and use <%= %>
for writing.
<%
let a = [42, 123, 999, 0, true, "hello", "world!", 987.6543];
// Loop through the array
for (item, count) in a { %>
Item #<%= count + 1 %> = <%= item %>
<% } %>
Returns:
Item #1 = 42
Item #2 = 123
Item #3 = 999
Item #4 = 0
Item #5 = true
Item #6 = hello
Item #7 = world!
Item #8 = 987.6543
Rendering
The rhai_tpl::Engine
enables rendering and customization. It has 2 generic params: W: Write
and S: State
which is state you can use when modifying the engine. it is implemented by default for any type implementing Clone + Send + Sync + 'static
.
let f = std::fs::OpenOptions::new()
.create(true)
.write(true)
.open(&filepath)?;
let engine = rhai_tpl::Engine::new::<std::fs::File, ()>();
let input = ""; // you'd fetch this from a file or whatever
let tpl = engine.compile(input)?;
tpl.render(f, ())?;
Customizing
You can mutate the engine directly by adding / modifying functions available to users:
let mut engine = Engine::new::<std::fs::File, ()>();
engine.register_fn(
"write",
|tw: &mut TemplateWriter<std::fs::File, ()>,
d: Dynamic|
-> Result<(), Box<EvalAltResult>> {
tw.write_all(format!("overloaded: {d}").as_bytes())
.map_err(|e| Box::new(EvalAltResult::from(e.to_string())))?;
Ok(())
},
);
This modification overrides the default write
output for the rhai::Dynamic
type and prefixes it with overloaded:
. It's not particularly useful, but it gives you an idea.
Dependencies
~7–12MB
~115K SLoC