Feat/tera: Support Tera Templating

[Galitan-dev]

Feat/tera: Support Tera Templating

See Issue #512

Description

I added Tera Templating support (the Tera instance is sent to handlers via the request extensions). I also implemented the i18n tera filters as said in my last PR.

Usage Example

(See the new tera-i18n example)

# ressources/en-US/simple.ftl
hello-world = Hello world!
welcome = welcome { $name }!

<!-- template/hello.html.tera ->
<h1>{{ "welcome" | translate(name=name) }}</h1>

// src/main.rs
#[handler]
fn hello(Path(name): Path<String>, tera: Tera) -> TeraTemplate {
    tera.render("hello.html.tera", &ctx!{ "name": &name })
}

#[tokio::main]
async fn main() -> Result<(), std::io::Error> {
    let app = Route::new()
        .at("/hello/:name", get(hello))
        .with(TeraTemplating::from_glob("templates/**/*"))
        .using(filters::i18n::translate)
        .data(resources);

    Server::new(TcpListener::bind("127.0.0.1:3000"))
        .run(app)
        .await
}

[Galitan-dev]

oops I broke the Locale extractor, I thought that my implementation of FromRequest for FromRequestSync worked
I will fix it

[Galitan-dev]

I think we are good

[Galitan-dev]

I force-pushed because the commit is for the next PR.

[sunli829]

I don't think it's necessary, what do you think? @Galitan-dev

Suggested change

	/// Extract from request head and body synchronously.
	fn from_request_sync(_req: &'a Request, _body: &mut RequestBody) -> Result<Self> {
	panic!("Not implemented, please implement one of from_request and from_request_sync");
	}
	/// Extract from request head synchronously.
	fn from_request_without_body_sync(req: &'a Request) -> Result<Self> {
	Self::from_request_sync(req, &mut Default::default())
	}
	/// Extract from request head and body synchronously.
	fn from_request_sync(_req: &'a Request, _body: &mut RequestBody) -> Result<Self> {
	panic!("Not implemented, please implement one of from_request and from_request_sync");
	}
	/// Extract from request head synchronously.
	fn from_request_without_body_sync(req: &'a Request) -> Result<Self> {
	Self::from_request_sync(req, &mut Default::default())
	}