feat: add i18n support for libcosmic widgets

Cargo.toml

@@ -107,6 +107,13 @@ cctk = { git = "https://github.com/pop-os/cosmic-protocols", package = "cosmic-c
 chrono = "0.4.41"
 cosmic-config = { path = "cosmic-config" }
 cosmic-settings-config = { git = "https://github.com/pop-os/cosmic-settings-daemon", optional = true }
+# Internationalization
+i18n-embed = { version = "0.16.0", features = [
+    "fluent-system",
+    "desktop-requester",
+] }
+i18n-embed-fl = "0.10"
+rust-embed = "8.7.2"
 css-color = "0.2.8"
 derive_setters = "0.1.8"
 futures = "0.3"

i18n.toml

@@ -0,0 +1,4 @@
+fallback_language = "en"
+
+[fluent]
+assets_dir = "i18n"

i18n/en/libcosmic.ftl

@@ -0,0 +1,11 @@
+# Context Drawer
+close = Close
+
+# About
+license = License
+links = Links
+developers = Developers
+designers = Designers
+artists = Artists
+translators = Translators
+documenters = Documenters

i18n/sr-Cyrl/libcosmic.ftl

@@ -0,0 +1,11 @@
+# Context Drawer
+close = Затвори
+
+# About
+license = Лиценца
+links = Линкови
+Developers = Програмери
+Designers = Дизајнери
+Artists = Уметници
+Translators = Преводиоци
+Documenters = Документатори

i18n/sr-Latn/libcosmic.ftl

@@ -0,0 +1,11 @@
+# Context Drawer
+close = Zatvori
+
+# About
+license = Licenca
+links = Linkovi
+developers = Programeri
+designers = Dizajneri
+artists = Umetnici
+translators = Prevodioci
+documenters = Dokumentatori

src/lib.rs

@@ -90,6 +90,8 @@ pub use iced_wgpu;
 pub mod icon_theme;
 pub mod keyboard_nav;
 
+mod localize;
+
 #[cfg(all(target_env = "gnu", not(target_os = "windows")))]
 pub(crate) mod malloc;
 

src/localize.rs

@@ -0,0 +1,51 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
+use i18n_embed::{
+    DefaultLocalizer, LanguageLoader, Localizer,
+    fluent::{FluentLanguageLoader, fluent_language_loader},
+};
+use rust_embed::RustEmbed;
+use std::sync::{LazyLock, OnceLock};
+
+#[derive(RustEmbed)]
+#[folder = "i18n/"]
+struct Localizations;
+
+pub static LANGUAGE_LOADER: LazyLock<FluentLanguageLoader> = LazyLock::new(|| {
+    let loader: FluentLanguageLoader = fluent_language_loader!();
+
+    loader
+        .load_fallback_language(&Localizations)
+        .expect("Error while loading fallback language");
+
+    loader
+});
+
+static LOCALIZATION_INITIALIZED: OnceLock<()> = OnceLock::new();
+
+#[macro_export]
+macro_rules! fl {
+    ($message_id:literal) => {{
+        $crate::localize::localize();
+        i18n_embed_fl::fl!($crate::localize::LANGUAGE_LOADER, $message_id)
+    }};
+    ($message_id:literal, $($args:expr),*) => {{
+        $crate::localize::localize();
+        i18n_embed_fl::fl!($crate::localize::LANGUAGE_LOADER, $message_id, $($args), *)
+    }};
+}
+
+// Get the `Localizer` to be used for localizing this library.
+pub fn localizer() -> Box<dyn Localizer> {
+    Box::from(DefaultLocalizer::new(&*LANGUAGE_LOADER, &Localizations))
+}
+
+pub fn localize() {
+    LOCALIZATION_INITIALIZED.get_or_init(|| {
+        let localizer = localizer();
+        let requested_languages = i18n_embed::DesktopLanguageRequester::requested_languages();
+        if let Err(error) = localizer.select(&requested_languages) {
+            eprintln!("Error while loading language for libcosmic {}", error);
+        }
+    });
+}

src/widget/about.rs

@@ -1,6 +1,6 @@
 use {
     crate::{
-        Element,
+        Element, fl,
         iced::{Alignment, Length},
         widget::{self, horizontal_space},
     },
@@ -116,7 +116,7 @@ pub fn about<'a, Message: Clone + 'static>(
         space_xxs, space_m, ..
     } = crate::theme::spacing();
 
-    let section = |list: &'a Vec<(String, String)>, title: &'a str| {
+    let section = |list: &'a Vec<(String, String)>, title: String| {
         (!list.is_empty()).then_some({
             let items: Vec<Element<Message>> =
                 list.iter()
@@ -150,15 +150,15 @@ pub fn about<'a, Message: Clone + 'static>(
     });
     let author = about.author.as_ref().map(widget::text::body);
     let version = about.version.as_ref().map(widget::button::standard);
-    let links_section = section(&about.links, "Links");
-    let developers_section = section(&about.developers, "Developers");
-    let designers_section = section(&about.designers, "Designers");
-    let artists_section = section(&about.artists, "Artists");
-    let translators_section = section(&about.translators, "Translators");
-    let documenters_section = section(&about.documenters, "Documenters");
+    let links_section = section(&about.links, fl!("links"));
+    let developers_section = section(&about.developers, fl!("developers"));
+    let designers_section = section(&about.designers, fl!("designers"));
+    let artists_section = section(&about.artists, fl!("artists"));
+    let translators_section = section(&about.translators, fl!("translators"));
+    let documenters_section = section(&about.documenters, fl!("documenters"));
     let license = about.license.as_ref().map(|license| {
         let url = about.get_license_url();
-        widget::settings::section().title("License").add(
+        widget::settings::section().title(fl!("license")).add(
             widget::button::custom(
                 widget::row()
                     .push(widget::text(license))

src/widget/context_drawer/widget.rs

@@ -1,12 +1,10 @@
 // Copyright 2023 System76 <info@system76.com>
 // SPDX-License-Identifier: MPL-2.0
 
-use std::borrow::Cow;
-
-use crate::widget::{LayerContainer, button, column, container, icon, row, scrollable, text};
-use crate::{Apply, Element, Renderer, Theme};
-
 use super::overlay::Overlay;
+use crate::widget::{LayerContainer, button, column, container, icon, row, scrollable, text};
+use crate::{Apply, Element, Renderer, Theme, fl};
+use std::borrow::Cow;
 
 use iced_core::Alignment;
 use iced_core::event::{self, Event};
@@ -86,7 +84,7 @@ impl<'a, Message: Clone + 'static> ContextDrawer<'a, Message> {
                 )
                 .push_maybe(title)
                 .push(
-                    button::text("Close")
+                    button::text(fl!("close"))
                         .trailing_icon(icon::from_name("go-next-symbolic"))
                         .on_press(on_close)
                         .apply(container)