feat(i18n): add t_args method for localized strings with arguments

Author: Bli-AIk

src/i18n.rs

@@ -1,6 +1,7 @@
 //! Internationalization support using Fluent.
 
 use bevy::prelude::*;
+pub use fluent_bundle::FluentArgs;
 use fluent_bundle::FluentResource;
 use fluent_bundle::concurrent::FluentBundle;
 use std::sync::Arc;
@@ -110,6 +111,21 @@ impl I18n {
         }
     }
 
+    /// Get a localized string with named arguments.
+    pub fn t_args(&self, id: &str, args: &fluent_bundle::FluentArgs) -> String {
+        let msg = self.bundle.get_message(id);
+        match msg {
+            Some(msg) => {
+                let pattern = msg.value().expect("message has no value");
+                let mut errors = vec![];
+                self.bundle
+                    .format_pattern(pattern, Some(args), &mut errors)
+                    .to_string()
+            }
+            None => id.to_string(),
+        }
+    }
+
     fn build_bundle(locale: Locale, custom: &[(Locale, String)]) -> FluentBundle<FluentResource> {
         let lang_id = locale.lang_id();
         let source = locale.ftl_source();