Merge branch 'translation' into 'master'

Use xkb layout names from gnome

See merge request Librem5/squeekboard!280

debian/control

@@ -9,6 +9,7 @@ Build-Depends:
  ninja-build,
  pkg-config,
  libglib2.0-dev,
+ libgnome-desktop-3-dev,
  libgtk-3-dev,
  libcroco3-dev,
  librust-bitflags-1-dev (>= 1.0),

src/locale.rs

@@ -1,24 +1,99 @@
-/*! Locale-specific functions */
+/*! Locale-specific functions. 
+ * 
+ * This file is intended as a library:
+ * it must pass errors upwards
+ * and panicking is allowed only when
+ * this code encounters an internal inconsistency.
+ */
 
 use std::cmp;
-use std::ffi::CString;
+use std::ffi::{ CStr, CString };
+use std::os::raw::c_char;
+use std::ptr;
+use std::str::Utf8Error;
 
 mod c {
-    use std::os::raw::c_char;
+    use super::*;
+    use std::os::raw::c_void;
 
     #[allow(non_camel_case_types)]
     pub type c_int = i32;
 
+    #[derive(Clone, Copy)]
+    #[repr(C)]
+    pub struct GnomeXkbInfo(*const c_void);
+
     #[no_mangle]
     extern "C" {
         // from libc
         pub fn strcoll(cs: *const c_char, ct: *const c_char) -> c_int;
+        // from gnome-desktop3
+        pub fn gnome_xkb_info_new() -> GnomeXkbInfo;
+        pub fn gnome_xkb_info_get_layout_info (
+            info: GnomeXkbInfo,
+            id: *const c_char,
+            display_name: *mut *const c_char,
+            short_name: *const *const c_char,
+            xkb_layout: *const *const c_char,
+            xkb_variant: *const *const c_char
+        ) -> c_int;
+        pub fn g_object_unref(o: GnomeXkbInfo);
+    }
+}
+
+#[derive(Debug)]
+pub enum Error {
+    StringConversion(Utf8Error),
+    NoInfo,
+}
+
+pub struct XkbInfo(c::GnomeXkbInfo);
+
+impl XkbInfo {
+    pub fn new() -> XkbInfo {
+        XkbInfo(unsafe { c::gnome_xkb_info_new() })
+    }
+    pub fn get_display_name(&self, id: &str) -> Result<String, Error> {
+        let id = cstring_safe(id);
+        let id_ref = id.as_ptr();
+        let mut display_name: *const c_char = ptr::null();
+        let found = unsafe {
+            c::gnome_xkb_info_get_layout_info(
+                self.0,
+                id_ref,
+                &mut display_name as *mut *const c_char,
+                ptr::null(), ptr::null(), ptr::null(),
+            )
+        };
+        if found != 0 && !display_name.is_null() {
+            let display_name = unsafe { CStr::from_ptr(display_name) };
+            display_name.to_str()
+                .map(str::to_string)
+                .map_err(Error::StringConversion)
+        } else {
+            Err(Error::NoInfo)
+        }
+    }
+}
+
+impl Drop for XkbInfo {
+    fn drop(&mut self) {
+        unsafe { c::g_object_unref(self.0) }
     }
 }
 
 #[derive(Clone, Debug, PartialEq)]
 pub struct Translation<'a>(pub &'a str);
 
+impl<'a> Translation<'a> {
+    pub fn to_owned(&'a self) -> OwnedTranslation {
+        OwnedTranslation(self.0.to_owned())
+    }
+}
+
+#[derive(Clone, Debug, PartialEq)]
+pub struct OwnedTranslation(pub String);
+
 fn cstring_safe(s: &str) -> CString {
     CString::new(s)
         .unwrap_or(CString::new("").unwrap())

src/logging.rs

@@ -70,12 +70,12 @@ pub enum Level {
 /// Approach 2.
 pub trait Warn {
     type Value;
-    fn ok_warn(self, msg: &str) -> Option<Self::Value>;
+    fn or_warn(self, msg: &str) -> Option<Self::Value>;
 }
 
 impl<T, E: Error> Warn for Result<T, E> {
     type Value = T;
-    fn ok_warn(self, msg: &str) -> Option<T> {
+    fn or_warn(self, msg: &str) -> Option<T> {
         self.map_err(|e| {
             eprintln!("{}: {}", msg, e);
             e
@@ -83,6 +83,16 @@ impl<T, E: Error> Warn for Result<T, E> {
     }
 }
 
+impl<T> Warn for Option<T> {
+    type Value = T;
+    fn or_warn(self, msg: &str) -> Option<T> {
+        self.or_else(|| {
+            eprintln!("{}", msg);
+            None
+        })
+    }
+}
+
 /// A mutable handler for text warnings.
 /// Approach 3.
 pub trait WarningHandler {

src/meson.build

@@ -39,6 +39,7 @@ cc = meson.get_compiler('c')
 deps = [
 #  dependency('glib-2.0', version: '>=2.26.0'),
   dependency('gio-2.0', version: '>=2.26.0'),
+  dependency('gnome-desktop-3.0', version: '>=3.0'),
   dependency('gtk+-3.0', version: '>=3.0'),
   dependency('libcroco-0.6'),
   dependency('wayland-client', version: '>=1.14'),

src/popover.rs

@@ -4,7 +4,8 @@ use gio;
 use gtk;
 use std::ffi::CString;
 use ::layout::c::{ Bounds, EekGtkKeyboard };
-use ::locale::{ Translation, compare_current_locale };
+use ::locale;
+use ::locale::{ OwnedTranslation, Translation, compare_current_locale };
 use ::locale_config::system_locale;
 use ::manager;
 use ::resources;
@@ -17,6 +18,7 @@ use glib::variant::ToVariant;
 use gtk::PopoverExt;
 use gtk::WidgetExt;
 use std::io::Write;
+use ::logging::Warn;
 
 mod variants {
     use glib;
@@ -94,7 +96,7 @@ mod variants {
     }
 }
 
-fn make_menu_builder(inputs: Vec<(&str, Translation)>) -> gtk::Builder {
+fn make_menu_builder(inputs: Vec<(&str, OwnedTranslation)>) -> gtk::Builder {
     let mut xml: Vec<u8> = Vec::new();
     writeln!(
         xml,
@@ -194,6 +196,82 @@ fn get_current_layout(
     }
 }
 
+/// Translates all provided layout names according to current locale,
+/// for the purpose of display (i.e. errors will be caught and reported)
+fn translate_layout_names(layouts: &Vec<LayoutId>) -> Vec<OwnedTranslation> {
+    // This procedure is rather ugly...
+    // Xkb lookup *must not* be applied to non-system layouts,
+    // so both translators can't be merged into one lookup table,
+    // therefore must be done in two steps.
+    // `XkbInfo` being temporary also means
+    // that its return values must be copied,
+    // forcing the use of `OwnedTranslation`.
+    enum Status {
+        /// xkb names should get all translated here
+        Translated(OwnedTranslation),
+        /// Builtin names need builtin translations
+        Remaining(String),
+    }
+
+    // Attempt to take all xkb names from gnome-desktop's xkb info.
+    let xkb_translator = locale::XkbInfo::new();
+
+    let translated_names = layouts.iter()
+        .map(|id| match id {
+            LayoutId::System { name, kind: _ } => {
+                xkb_translator.get_display_name(name)
+                    .map(|s| Status::Translated(OwnedTranslation(s)))
+                    .unwrap_or_else(|e| {
+                        eprintln!(
+                            "No display name for xkb layout {}: {:?}",
+                            name,
+                            e,
+                        );
+                        Status::Remaining(name.clone())
+                    })
+            },
+            LayoutId::Local(name) => Status::Remaining(name.clone()),
+        });
+
+    // Non-xkb layouts and weird xkb layouts
+    // still need to be looked up in the internal database.
+    let builtin_translations = system_locale()
+        .map(|locale|
+            locale.tags_for("messages")
+                .next().unwrap() // guaranteed to exist
+                .as_ref()
+                .to_owned()
+        )
+        .or_warn("No locale detected")
+        .and_then(|lang| {
+            resources::get_layout_names(lang.as_str())
+                .or_warn(&format!("No translations for locale {}", lang))
+        });
+
+    match builtin_translations {
+        Some(translations) => {
+            translated_names
+                .map(|status| match status {
+                    Status::Remaining(name) => {
+                        translations.get(name.as_str())
+                            .unwrap_or(&Translation(name.as_str()))
+                            .to_owned()
+                    },
+                    Status::Translated(t) => t,
+                })
+                .collect()
+        },
+        None => {
+            translated_names
+                .map(|status| match status {
+                    Status::Remaining(name) => OwnedTranslation(name),
+                    Status::Translated(t) => t,
+                })
+                .collect()
+        },
+    }
+}
+
 pub fn show(
     window: EekGtkKeyboard,
     position: Bounds,
@@ -218,46 +296,21 @@ pub fn show(
         .chain(overlay_layouts)
         .collect();
 
-    let translations = system_locale()
+    let translated_names = translate_layout_names(&all_layouts);
-        .map(|locale|
+    
-            locale.tags_for("messages")
-                .next().unwrap() // guaranteed to exist
-                .as_ref()
-                .to_owned()
-        )
-        .and_then(|lang| resources::get_layout_names(lang.as_str()));
-
-    let translated_names = all_layouts.iter()
-        .map(LayoutId::get_name);
-    let translated_names: Vec<Translation> = match translations {
-        Some(translations) => {
-            translated_names
-                .map(move |name| {
-                    translations.get(name)
-                        .map(|translation| translation.clone())
-                        .unwrap_or(Translation(name))
-                })
-                .collect()
-        },
-        None => {
-            translated_names.map(|name| Translation(name))
-                .collect()
-        },
-    };
-
     // sorted collection of human and machine names
-    let mut human_names: Vec<(Translation, LayoutId)> = translated_names
+    let mut human_names: Vec<(OwnedTranslation, LayoutId)> = translated_names
         .into_iter()
         .zip(all_layouts.clone().into_iter())
         .collect();
 
     human_names.sort_unstable_by(|(tr_a, _), (tr_b, _)| {
-        compare_current_locale(tr_a.0, tr_b.0)
+        compare_current_locale(&tr_a.0, &tr_b.0)
     });
 
     // GVariant doesn't natively support `enum`s,
     // so the `choices` vector will serve as a lookup table.
-    let choices_with_translations: Vec<(String, (Translation, LayoutId))>
+    let choices_with_translations: Vec<(String, (OwnedTranslation, LayoutId))>
         = human_names.into_iter()
             .enumerate()
                 .map(|(i, human_entry)| {(
@@ -268,7 +321,7 @@ pub fn show(
 
     let builder = make_menu_builder(
         choices_with_translations.iter()
-            .map(|(id, (translation, _))| (id.as_str(), translation.clone()))
+            .map(|(id, (translation, _))| (id.as_str(), (*translation).clone()))
             .collect()
     );
 

src/style.rs

@@ -16,7 +16,7 @@
  * License along with this library. If not, see <http://www.gnu.org/licenses/>.Free
  */
 
-/*! CSS data loading */
+/*! CSS data loading. */
 
 use std::env;
 
@@ -83,6 +83,7 @@ fn get_theme_name(settings: &gtk::Settings) -> GtkTheme {
         .map_err(|e| {
             match &e {
                 env::VarError::NotPresent => {},
+                // maybe TODO: forward this warning?
                 e => eprintln!("GTK_THEME variable invalid: {}", e),
             };
             e
@@ -93,13 +94,15 @@ fn get_theme_name(settings: &gtk::Settings) -> GtkTheme {
         None => GtkTheme {
             name: {
                 settings.get_property("gtk-theme-name")
-                    .ok_warn("No theme name")
+                    // maybe TODO: is this worth a warning?
+                    .or_warn("No theme name")
                     .and_then(|value| value.get::<String>())
                     .unwrap_or(DEFAULT_THEME_NAME.into())
             },
             variant: {
                 settings.get_property("gtk-application-prefer-dark-theme")
-                    .ok_warn("No settings key")
+                    // maybe TODO: is this worth a warning?
+                    .or_warn("No settings key")
                     .and_then(|value| value.get::<bool>())
                     .and_then(|dark_preferred| match dark_preferred {
                         true => Some("dark".into()),

src/util.rs

@@ -190,6 +190,11 @@ impl<T> Borrow<Rc<T>> for Pointer<T> {
     }
 }
 
+pub trait WarningHandler {
+    /// Handle a warning
+    fn handle(&mut self, warning: &str);
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;