The fluent-rs workspace is a collection of Rust crates implementing Project Fluent, a localization system designed to unleash the entire expressive power of natural language translations.

This is an umbrella crate exposing the combined features of fluent-rs crates with additional convenience macros.

use fluent::{FluentBundle, FluentResource};
use unic_langid::langid;

fn main() {
    let ftl_string = "hello-world = Hello, world!".to_owned();
    let res = FluentResource::try_new(ftl_string)
        .expect("Failed to parse an FTL string.");

    let langid_en = langid!("en-US");
    let mut bundle = FluentBundle::new(vec![langid_en]);

    bundle.add_resource(&res)
        .expect("Failed to add FTL resources to the bundle.");

    let msg = bundle.get_message("hello-world")
        .expect("Message doesn't exist.");
    let mut errors = vec![];
    let pattern = msg.value
        .expect("Message has no value.");
    let value = bundle.format_pattern(&pattern, None, &mut errors);

    assert_eq!(&value, "Hello, world!");
}

FluentBundle, which is the main struct at the moment, is intended to remain a low level API. There is a number of higher level APIs like fluent-resmgr and fluent-fallback intended to wrap around it and provide better ergonomics for bindings and direct usage. Those higher level APIs are not mature yet enough to be included in this package, but will get added once they are.

FTL is a localization file format used for describing translation resources. FTL stands for Fluent Translation List.

FTL is designed to be simple to read, but at the same time allows to represent complex concepts from natural languages like gender, plurals, conjugations, and others.

hello-user = Hello, { $username }!

Read the Fluent Syntax Guide in order to learn more about the syntax. If you're a tool author you may be interested in the formal EBNF grammar.

fluent-rs is open-source, licensed under both the Apache 2.0 and MIT licenses. We encourage everyone to take a look at our code and we'll listen to your feedback.

We'd love to hear your thoughts on Project Fluent! Whether you're a localizer looking for a better way to express yourself in your language, or a developer trying to make your app localizable and multilingual, or a hacker looking for a project to contribute to, please do get in touch on the mailing list and the IRC channel.

• Discourse: https://discourse.mozilla.org/c/fluent
• Matrix channel: #fluent:mozilla.org