json-gettext 4.0.10

A library for getting text from JSON usually for internationalization.
Documentation 
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#[macro_use]
extern crate rocket;

#[macro_use]
extern crate rocket_accept_language;

#[macro_use]
extern crate json_gettext;

use std::error::Error;

use json_gettext::{JSONGetTextManager, Key};
use rocket::State;
use rocket_accept_language::{unic_langid::subtags::Language, AcceptLanguage};

const LANGUAGE_EN: Language = language!("en");

#[get("/")]
fn index(ctx: &State<JSONGetTextManager>, accept_language: &AcceptLanguage) -> String {
    let language = accept_language.get_first_language().unwrap_or(LANGUAGE_EN);

    format!("Ron: {}", get_text!(ctx, Key(language), "hello").unwrap().as_str().unwrap())
}

#[rocket::main]
async fn main() -> Result<(), Box<dyn Error>> {
    rocket::build()
        .attach(static_json_gettext_build_for_rocket!(
            key!("en");
            key!("en") => "langs/en_US.json",
            key!("zh") => "langs/zh_TW.json",
        ))
        .mount("/", routes![index])
        .launch()
        .await?;

    Ok(())
}