Add support for translations (#469)

* Reformat code with idea tool * Pierwsza działająca wersja tłumaczeń * Działa? I dobrze, bo ma działać * Ćma szła i się potkła * Ściął śmiałek źółty rząd pąków.
qarmin · Dec 11, 2021 · 77a48ca · 77a48ca
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diff --git a/Cargo.lock b/Cargo.lock
diff --git a/README.md b/README.md
@@ -11,6 +11,7 @@
 - CLI frontend - for easy automation
 - GUI frontend - uses modern GTK 3 and looks similar to FSlint
 - No spying - Czkawka does not have access to the Internet, nor does it collect any user information or statistics
+- Multilingual - app support multiple languages
 - Multiple tools to use:
   - Duplicates - Finds duplicates based on file name, size or hash
   - Empty Folders - Finds empty folders with the help of an advanced algorithm
@@ -131,6 +132,7 @@ You can help by creating:
 - Pull Requests - implementing a new feature yourself or fixing bugs.
   If the change is bigger, then it's a good idea to open a new issue to discuss changes.
 - Documentation - There is an [instruction](instructions/Instruction.md) which you can improve.
+- Translations - Instruction how to translate files is available [here](instructions/Translations.md)
 
 You can also help by doing different things:
 - Creating text articles - [LinuxUprising](https://www.linuxuprising.com/2021/03/find-and-remove-duplicate-files-similar.html) or [Ubunlog](https://ubunlog.com/en/czkawka-finds-and-removes-empty-and-broken-duplicate-files/)

diff --git a/czkawka_core/Cargo.toml b/czkawka_core/Cargo.toml
@@ -50,6 +50,11 @@ serde = "1.0.130"
 bincode = "1.3.3"
 serde_json = "1.0.72"
 
+# Language
+i18n-embed = { version = "0.13", features = ["fluent-system", "desktop-requester"] }
+i18n-embed-fl = "0.6"
+rust-embed = "6.2.0"
+once_cell = "1.8.0"
 
 [features]
 default = []

diff --git a/czkawka_core/i18n.toml b/czkawka_core/i18n.toml
@@ -0,0 +1,13 @@
+# (Required) The language identifier of the language used in the
+# source code for gettext system, and the primary fallback language
+# (for which all strings must be present) when using the fluent
+# system.
+fallback_language = "en"
+
+# Use the fluent localization system.
+[fluent]
+# (Required) The path to the assets directory.
+# The paths inside the assets directory should be structured like so:
+# `assets_dir/{language}/{domain}.ftl`
+assets_dir = "../i18n"
+
diff --git a/czkawka_core/src/lib.rs b/czkawka_core/src/lib.rs
@@ -18,5 +18,6 @@ pub mod common_extensions;
 pub mod common_items;
 pub mod common_messages;
 pub mod common_traits;
+pub mod localizer;
 
 pub const CZKAWKA_VERSION: &str = env!("CARGO_PKG_VERSION");
diff --git a/czkawka_core/src/localizer.rs b/czkawka_core/src/localizer.rs
@@ -0,0 +1,34 @@
+use i18n_embed::{
+    fluent::{fluent_language_loader, FluentLanguageLoader},
+    DefaultLocalizer, LanguageLoader, Localizer,
+};
+use once_cell::sync::Lazy;
+use rust_embed::RustEmbed;
+
+#[derive(RustEmbed)]
+#[folder = "../i18n/"]
+struct Localizations;
+
+pub static LANGUAGE_LOADER: Lazy<FluentLanguageLoader> = Lazy::new(|| {
+    let loader: FluentLanguageLoader = fluent_language_loader!();
+
+    loader.load_fallback_language(&Localizations).expect("Error while loading fallback language");
+
+    loader
+});
+
+#[macro_export]
+macro_rules! fl {
+    ($message_id:literal) => {{
+        i18n_embed_fl::fl!($crate::localizer::LANGUAGE_LOADER, $message_id)
+    }};
+
+    ($message_id:literal, $($args:expr),*) => {{
+        i18n_embed_fl::fl!($crate::localizer::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))
+}
diff --git a/czkawka_core/src/similar_images.rs b/czkawka_core/src/similar_images.rs
@@ -23,6 +23,7 @@ use crate::common_directory::Directories;
 use crate::common_items::ExcludedItems;
 use crate::common_messages::Messages;
 use crate::common_traits::{DebugPrint, PrintResults, SaveResults};
+use crate::fl;
 
 // TODO check for better values
 pub const SIMILAR_VALUES: [[u32; 6]; 4] = [
@@ -905,35 +906,35 @@ pub fn get_string_from_similarity(similarity: &Similarity, hash_size: u8) -> Str
             #[cfg(debug_assertions)]
             {
                 if *h <= SIMILAR_VALUES[index_preset][0] {
-                    format!("Very High {}", *h)
+                    format!("{} {}", fl!("core_similarity_very_high"), *h)
                 } else if *h <= SIMILAR_VALUES[index_preset][1] {
-                    format!("High {}", *h)
+                    format!("{} {}", fl!("core_similarity_high"), *h)
                 } else if *h <= SIMILAR_VALUES[index_preset][2] {
-                    format!("Medium {}", *h)
+                    format!("{} {}", fl!("core_similarity_medium"), *h)
                 } else if *h <= SIMILAR_VALUES[index_preset][3] {
-                    format!("Small {}", *h)
+                    format!("{} {}", fl!("core_similarity_small"), *h)
                 } else if *h <= SIMILAR_VALUES[index_preset][4] {
-                    format!("Very Small {}", *h)
+                    format!("{} {}", fl!("core_similarity_very_small"), *h)
                 } else if *h <= SIMILAR_VALUES[index_preset][5] {
-                    format!("Minimal {}", *h)
+                    format!("{} {}", fl!("core_similarity_minimal"), *h)
                 } else {
                     panic!();
                 }
             }
             #[cfg(not(debug_assertions))]
             {
                 if *h <= SIMILAR_VALUES[index_preset][0] {
-                    format!("Very High")
+                    fl!("core_similarity_very_high")
                 } else if *h <= SIMILAR_VALUES[index_preset][1] {
-                    format!("High")
+                    fl!("core_similarity_high")
                 } else if *h <= SIMILAR_VALUES[index_preset][2] {
-                    format!("Medium")
+                    fl!("core_similarity_medium")
                 } else if *h <= SIMILAR_VALUES[index_preset][3] {
-                    format!("Small")
+                    fl!("core_similarity_small")
                 } else if *h <= SIMILAR_VALUES[index_preset][4] {
-                    format!("Very Small")
+                    fl!("core_similarity_very_small")
                 } else if *h <= SIMILAR_VALUES[index_preset][5] {
-                    format!("Minimal")
+                    fl!("core_similarity_minimal")
                 } else {
                     panic!();
                 }

diff --git a/czkawka_gui/Cargo.toml b/czkawka_gui/Cargo.toml
@@ -43,6 +43,12 @@ trash = "1.3.0"
 # For moving files(why std::fs doesn't have such features)
 fs_extra = "1.2.0"
 
+# Language
+i18n-embed = { version = "0.13", features = ["fluent-system", "desktop-requester"] }
+i18n-embed-fl = "0.6"
+rust-embed = "6.2.0"
+once_cell = "1.8.0"
+
 [target.'cfg(windows)'.dependencies]
 winapi = { version = "0.3.9", features = ["combaseapi", "objbase", "shobjidl_core", "windef", "winerror", "wtypesbase", "winuser"] }
 

diff --git a/czkawka_gui/i18n.toml b/czkawka_gui/i18n.toml
@@ -0,0 +1,13 @@
+# (Required) The language identifier of the language used in the
+# source code for gettext system, and the primary fallback language
+# (for which all strings must be present) when using the fluent
+# system.
+fallback_language = "en"
+
+# Use the fluent localization system.
+[fluent]
+# (Required) The path to the assets directory.
+# The paths inside the assets directory should be structured like so:
+# `assets_dir/{language}/{domain}.ftl`
+assets_dir = "../i18n"
+