# Internationalization
[](https://crates.io/crates/internationalization)
[](https://coveralls.io/github/terry90/internationalization-rs?branch=master)
[](https://travis-ci.org/terry90/internationalization-rs)
An simple compile time i18n implementation in Rust.
It throws a compilation error if the translation key is not present, but since the `lang` argument is dynamic it will panic if the language has not been added for the matching key.
> API documentation [https://crates.io/crates/internationalization](https://crates.io/crates/internationalization)
## Usage
Have a `locales/` folder somewhere in your app, root, src, anywhere. with `.json` files, nested in folders or not.
It uses a glob pattern: `**/locales/**/*.json` to match your translation files.
the files must look like this:
```json
{
"err.user.not_found": {
"fr": "Utilisateur introuvable: $email, $id",
"en": "User not found: $email, $id"
},
"err.answer.all": {
"fr": "Échec lors de la récupération des réponses",
"en": "Failed to retrieve answers"
},
"err.answer.delete.failed": {
"fr": "Échec lors de la suppression de la réponse",
"en": "Failed to delete answer"
}
}
```
Any number of languages can be added, but you should provide them for everything since it will panic if a language is not found when queried for a key.
In your app, jsut call the `t!` macro
```rust
fn main() {
let lang = "en";
let res = t!("err.not_allowed", lang);
assert_eq!("You are not allowed to do this", res);
}
```
You can use interpolation, any number of argument is OK but you should note that they have to be sorted alphabetically.
To use variables, call the `t!` macro like this:
```rust
fn main() {
let lang = "en";
let res = t!("err.user.not_found", email: "me@localhost", id: "1", lang);
assert_eq!("User not found: me@localhost, ID: 1", res);
}
```
## Installation
Internationalization is available on [crates.io](https://crates.io/crates/internationalization), include it in your `Cargo.toml`:
```toml
[dependencies]
internationalization = "0.0.2"
```
Then include it in your code like this:
```rust
#[macro_use]
extern crate internationalization;
```
Or use the macro where you want to use it:
```rust
use internationalization::t;
```
## Note
Internationalization will not work if no `PWD` env var is set at compile time.