util/gettext: Parse unicode escape sequences

Closes #351

Part-of: <https://gitlab.gnome.org/GNOME/loupe/-/merge_requests/426>

po/POTFILES.in

@@ -11,6 +11,7 @@ src/decoder/formats/svg.rs
 src/decoder/tiling.rs
 src/editing.rs
 src/file_model.rs
+src/lib.rs
 src/main.rs
 src/metadata.rs
 src/metadata/file.rs

src/lib.rs

@@ -0,0 +1,121 @@
+// Copyright (c) 2024 Sophie Herold
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+//
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#![allow(clippy::new_without_default)]
+
+/*!
+# Loupe Image Viewer
+
+Code documentation
+
+# Widget Structure
+
+Simplified widget arrangement including the most important widgets.
+
+-   [`LpWindow`]
+    -   [`AdwFlap`]
+        -   [`LpPropertiesView`]
+        -   [`LpImageView`]
+            -   [`LpSlidingView`]
+                -   [`LpImagePage`]
+                    -   [`GtkScrolledWindow`]
+                        -   [`LpImage`]
+                -   …
+
+[`AdwFlap`]: adw::Flap
+[`GtkScrolledWindow`]: gtk::ScrolledWindow
+[`LpImagePage`]: widgets::LpImagePage
+[`LpImageView`]: widgets::LpImageView
+[`LpImage`]: widgets::LpImage
+[`LpPropertiesView`]: widgets::LpPropertiesView
+[`LpSlidingView`]: widgets::LpSlidingView
+[`LpWindow`]: window::LpWindow
+*/
+
+use gettextrs::*;
+use gtk::gio::prelude::*;
+use gtk::gio::{self};
+
+pub mod about;
+pub mod application;
+pub mod config;
+pub mod decoder;
+pub mod editing;
+pub mod file_model;
+pub mod metadata;
+pub mod util;
+pub mod widgets;
+pub mod window;
+
+mod deps {
+    pub use gtk::{cairo, gdk, gio, glib, graphene, gsk};
+}
+
+use application::LpApplication;
+use deps::*;
+use tracing_subscriber::layer::*;
+use tracing_subscriber::util::*;
+
+static GRESOURCE_BYTES: &[u8] =
+    gvdb_macros::include_gresource_from_dir!("/org/gnome/Loupe", "data/resources");
+
+pub fn main() -> glib::ExitCode {
+    // Don't use ngl renderer by default due to performance reasons
+    // <https://gitlab.gnome.org/GNOME/gtk/-/issues/6411>
+    if std::env::var("GSK_RENDERER").map_or(true, |x| x.is_empty()) {
+        std::env::set_var("GSK_RENDERER", "gl");
+    }
+
+    // Don't use gl renderer does not properly support fractional scaling
+    // <https://gitlab.gnome.org/GNOME/loupe/-/issues/346>
+    if std::env::var("GDK_DEBUG").is_err() {
+        std::env::set_var("GDK_DEBUG", "gl-no-fractional");
+    }
+
+    // Follow G_MESSAGES_DEBUG env variable
+    let default_level =
+        if !glib::log_writer_default_would_drop(glib::LogLevel::Debug, Some("loupe")) {
+            tracing_subscriber::filter::LevelFilter::DEBUG
+        } else {
+            tracing_subscriber::filter::LevelFilter::ERROR
+        };
+
+    tracing_subscriber::registry()
+        .with(
+            tracing_subscriber::EnvFilter::builder()
+                .with_default_directive(default_level.into())
+                .from_env_lossy(),
+        )
+        .with(tracing_subscriber::fmt::Layer::default().compact())
+        .init();
+
+    log::debug!("Logger initialized");
+
+    setlocale(LocaleCategory::LcAll, "");
+    bindtextdomain("loupe", config::LOCALEDIR).unwrap();
+    textdomain("loupe").unwrap();
+
+    log::trace!("gettext initialized");
+
+    gio::resources_register(
+        &gio::Resource::from_data(&glib::Bytes::from_static(GRESOURCE_BYTES)).unwrap(),
+    );
+
+    log::trace!("Gio resources registered");
+
+    LpApplication::new().run()
+}

src/main.rs

@@ -1,5 +1,5 @@
-// Copyright (c) 2020-2022 Christopher Davis
-// Copyright (c) 2023-2024 Sophie Herold
+// Copyright (c) 2020 Christopher Davis
+// Copyright (c) 2024 Sophie Herold
 //
 // This program is free software: you can redistribute it and/or modify
 // it under the terms of the GNU General Public License as published by
@@ -16,107 +16,7 @@
 //
 // SPDX-License-Identifier: GPL-3.0-or-later
 
-#![allow(clippy::new_without_default)]
-
-/*!
-# Loupe Image Viewer
-
-Code documentation
-
-# Widget Structure
-
-Simplified widget arrangement including the most important widgets.
-
--   [`LpWindow`]
-    -   [`AdwFlap`]
-        -   [`LpPropertiesView`]
-        -   [`LpImageView`]
-            -   [`LpSlidingView`]
-                -   [`LpImagePage`]
-                    -   [`GtkScrolledWindow`]
-                        -   [`LpImage`]
-                -   …
-
-[`AdwFlap`]: adw::Flap
-[`GtkScrolledWindow`]: gtk::ScrolledWindow
-[`LpImagePage`]: widgets::LpImagePage
-[`LpImageView`]: widgets::LpImageView
-[`LpImage`]: widgets::LpImage
-[`LpPropertiesView`]: widgets::LpPropertiesView
-[`LpSlidingView`]: widgets::LpSlidingView
-[`LpWindow`]: window::LpWindow
-*/
-
-use gettextrs::*;
-use gtk::gio::prelude::*;
-use gtk::gio::{self};
-
-mod about;
-mod application;
-mod config;
-mod decoder;
-mod editing;
-mod file_model;
-mod metadata;
-mod util;
-mod widgets;
-mod window;
-
-mod deps {
-    pub use gtk::{cairo, gdk, gio, glib, graphene, gsk};
-}
-
-use application::LpApplication;
-use deps::*;
-use tracing_subscriber::layer::*;
-use tracing_subscriber::util::*;
-
-static GRESOURCE_BYTES: &[u8] =
-    gvdb_macros::include_gresource_from_dir!("/org/gnome/Loupe", "data/resources");
-
-fn main() -> glib::ExitCode {
-    // Don't use ngl renderer by default due to performance reasons
-    // <https://gitlab.gnome.org/GNOME/gtk/-/issues/6411>
-    if std::env::var("GSK_RENDERER").map_or(true, |x| x.is_empty()) {
-        std::env::set_var("GSK_RENDERER", "gl");
-    }
-
-    // Don't use gl renderer does not properly support fractional scaling
-    // <https://gitlab.gnome.org/GNOME/loupe/-/issues/346>
-    if std::env::var("GDK_DEBUG").is_err() {
-        std::env::set_var("GDK_DEBUG", "gl-no-fractional");
-    }
-
-    // Follow G_MESSAGES_DEBUG env variable
-    let default_level =
-        if !glib::log_writer_default_would_drop(glib::LogLevel::Debug, Some("loupe")) {
-            tracing_subscriber::filter::LevelFilter::DEBUG
-        } else {
-            tracing_subscriber::filter::LevelFilter::ERROR
-        };
-
-    tracing_subscriber::registry()
-        .with(
-            tracing_subscriber::EnvFilter::builder()
-                .with_default_directive(default_level.into())
-                .from_env_lossy(),
-        )
-        .with(tracing_subscriber::fmt::Layer::default().compact())
-        .init();
-
-    log::debug!("Logger initialized");
-
-    setlocale(LocaleCategory::LcAll, "");
-    bindtextdomain("loupe", config::LOCALEDIR).unwrap();
-    textdomain("loupe").unwrap();
-
-    log::trace!("gettext initialized");
-
-    gio::resources_register(
-        &gio::Resource::from_data(&glib::Bytes::from_static(GRESOURCE_BYTES)).unwrap(),
-    );
-
-    log::trace!("Gio resources registered");
-
-    LpApplication::new().run()
+use gtk::glib;
+pub fn main() -> glib::ExitCode {
+    loupe::main()
 }

src/metadata.rs

@@ -244,7 +244,11 @@ impl Metadata {
             .as_ref()
             .and_then(|exif| exif.get_field(exif::Tag::FNumber, exif::In::PRIMARY))
         {
-            return Some(format!("ƒ\u{2215}{}", field.display_value()));
+            // Translators: Display of the f-number <https://en.wikipedia.org/wiki/F-number>. {} will be replaced with the number
+            return Some(gettext_f(
+                r"\u{192}\u{2215}{}",
+                [field.display_value().to_string()],
+            ));
         }
 
         None
@@ -259,7 +263,7 @@ impl Metadata {
                 if speed <= 0.5 {
                     let exposure = format!("{:.0}", 1. / speed);
                     // Translators: Fractional exposure time (photography) in seconds
-                    return Some(gettext_f("1\u{2215}{}\u{202F}s", [exposure]));
+                    return Some(gettext_f(r"1\u{2215}{}\u{202F}s", [exposure]));
                 } else {
                     let exposure = if speed < 5. {
                         format!("{:.1}", speed)
@@ -267,7 +271,7 @@ impl Metadata {
                         format!("{:.0}", speed)
                     };
                     // Translators: Exposure time (photography) in seconds
-                    return Some(gettext_f("{}\u{202F}s", [exposure]));
+                    return Some(gettext_f(r"{}\u{202F}s", [exposure]));
                 }
             }
         }
@@ -293,7 +297,7 @@ impl Metadata {
             if let exif::Value::Rational(rational) = &field.value {
                 let length = format!("{:.0}", rational.first()?.to_f32());
                 // Translators: Unit for focal length in millimeters
-                return Some(gettext_f("{}\u{202F}mm", [length]));
+                return Some(gettext_f(r"{}\u{202F}mm", [length]));
             }
         }
 

src/util/gettext.rs

@@ -26,6 +26,64 @@ fn freplace(mut s: String, args: impl IntoIterator<Item = impl AsRef<str>>) -> S
 }
 
 pub fn gettext_f(format: &str, args: impl IntoIterator<Item = impl AsRef<str>>) -> String {
-    let s = gettextrs::gettext(format);
+    let s = ugettext(format);
     freplace(s, args)
 }
+
+/// Same as `gettext` but evaluates unicode escape sequences
+pub fn ugettext(msgid: &str) -> String {
+    let msg = gettext(msgid);
+    apply_unicode_escapes(&msg).unwrap_or(msg)
+}
+
+enum State {
+    None,
+    UnicodeHex,
+}
+
+/// Replace unicode escape sequences with the actual `char`
+///
+/// ```
+/// assert_eq!(
+///    loupe::util::gettext::apply_unicode_escapes(r"abc \u{03a6} \u{2764} d"),
+///    Some("abc \u{03a6} \u{2764} d".into())
+/// );
+pub fn apply_unicode_escapes(s: impl AsRef<str>) -> Option<String> {
+    let mut state = State::None;
+    let mut new = String::new();
+    let mut hex = String::new();
+    let mut char_iter = s.as_ref().chars();
+    while let Some(c) = char_iter.next() {
+        match state {
+            State::None if c == '\\' => {
+                if let (Some(c1), Some(c2)) = (char_iter.next(), char_iter.next()) {
+                    if c1 == 'u' && c2 == '{' {
+                        state = State::UnicodeHex;
+                    }
+                }
+            }
+            State::None => new.push(c),
+            State::UnicodeHex => {
+                if c == '}' {
+                    new.push(hex_to_char(&hex)?);
+                    hex.clear();
+                    state = State::None;
+                } else {
+                    hex.push(c);
+                }
+            }
+        }
+    }
+
+    Some(new)
+}
+
+/// Convert hex string to char
+///
+/// ```
+/// assert_eq!(loupe::util::gettext::hex_to_char("03a6"), Some('Φ'))
+/// ```
+pub fn hex_to_char(hex: &str) -> Option<char> {
+    let u = u32::from_str_radix(hex, 16).ok()?;
+    char::from_u32(u)
+}

src/widgets/image/input_handling.rs

@@ -1,4 +1,5 @@
 // Copyright (c) 2023-2024 Sophie Herold
+// Copyright (c) 2024 Fina Wilke
 //
 // This program is free software: you can redistribute it and/or modify
 // it under the terms of the GNU General Public License as published by

src/widgets/image/loading.rs

@@ -1,4 +1,5 @@
 // Copyright (c) 2023-2024 Sophie Herold
+// Copyright (c) 2024 Fina Wilke
 //
 // This program is free software: you can redistribute it and/or modify
 // it under the terms of the GNU General Public License as published by

src/widgets/image_page.rs

@@ -1,5 +1,5 @@
 // Copyright (c) 2022-2024 Sophie Herold
-// Copyright (c) 2022 Christopher Davis
+// Copyright (c) 2022, 2024 Christopher Davis
 // Copyright (c) 2024 Anders Jonsson
 //
 // This program is free software: you can redistribute it and/or modify

src/widgets/image_view.rs

@@ -4,6 +4,7 @@
 // Copyright (c) 2023 FineFindus
 // Copyright (c) 2023 Huan Nguyen
 // Copyright (c) 2023 Philipp Kiemle
+// Copyright (c) 2024 Fina Wilke
 //
 // This program is free software: you can redistribute it and/or modify
 // it under the terms of the GNU General Public License as published by

src/widgets/properties_view.rs

@@ -1,5 +1,7 @@
 // Copyright (c) 2022-2024 Sophie Herold
 // Copyright (c) 2022 Christopher Davis
+// Copyright (c) 2024 Lukáš Tyrychtr
+// Copyright (c) 2024 Fina Wilke
 //
 // This program is free software: you can redistribute it and/or modify
 // it under the terms of the GNU General Public License as published by
@@ -264,7 +266,7 @@ mod imp {
 
             if let Some(bit_depth) = metadata.bit_depth() {
                 // Translators: Addition of bit size to format name
-                format.push_str(&gettext_f(", {}\u{202F}bit", [bit_depth.to_string()]));
+                format.push_str(&gettext_f(r", {}\u{202F}bit", [bit_depth.to_string()]));
             }
 
             Some(format)
@@ -279,7 +281,11 @@ mod imp {
                     _ => {
                         let (width, height) = image.image_size();
                         if width > 0 && height > 0 {
-                            Some(format!("{width}\u{202F}\u{D7}\u{202F}{height}"))
+                            // Translators: Image "<width> x <height>"
+                            Some(gettext_f(
+                                r"{}\u{202F}\u{D7}\u{202F}{}",
+                                [width.to_string(), height.to_string()],
+                            ))
                         } else {
                             None
                         }

src/widgets/sliding_view.rs

@@ -2,6 +2,7 @@
 // Copyright (c) 2023 Alice Mikhaylenko
 // Copyright (c) 2023 Christopher Davis
 // Copyright (c) 2023 Lubosz Sarnecki
+// Copyright (c) 2024 Fina Wilke
 //
 // This program is free software: you can redistribute it and/or modify
 // it under the terms of the GNU General Public License as published by

src/window.rs

@@ -6,6 +6,7 @@
 // Copyright (c) 2023 FineFindus
 // Copyright (c) 2023 qwel
 // Copyright (c) 2023 Huan Thieu Nguyen
+// Copyright (c) 2024 Fina Wilke
 // Copyright (c) 2024 DaPigGuy
 // Copyright (c) 2024 James Frost
 //