feat(bar): add cjk font fallbacks

This commit adds CJK font fallbacks to Microsoft YaHei and Malgun
Gothic. This will be looked up at runtime on the user's system, and only
loaded if the files exist in the default Windows font installation
location.

resolve #1139

komorebi-bar/src/bar.rs

@@ -44,6 +44,7 @@ use komorebi_themes::Base16Value;
 use komorebi_themes::Catppuccin;
 use komorebi_themes::CatppuccinValue;
 use std::cell::RefCell;
+use std::collections::HashMap;
 use std::path::PathBuf;
 use std::rc::Rc;
 use std::sync::atomic::Ordering;
@@ -503,28 +504,45 @@ impl Komobar {
         let mut fonts = FontDefinitions::default();
         egui_phosphor::add_to_fonts(&mut fonts, egui_phosphor::Variant::Regular);
 
+        let mut fallbacks = HashMap::new();
+
+        fallbacks.insert("Microsoft YaHei", "C:\\Windows\\Fonts\\msyh.ttc"); // chinese
+        fallbacks.insert("Malgun Gothic", "C:\\Windows\\Fonts\\malgun.ttf"); // korean
+
+        for (name, path) in fallbacks {
+            if let Ok(bytes) = std::fs::read(path) {
+                fonts
+                    .font_data
+                    .insert(name.to_owned(), Arc::from(FontData::from_owned(bytes)));
+
+                for family in [FontFamily::Proportional, FontFamily::Monospace] {
+                    fonts
+                        .families
+                        .entry(family)
+                        .or_default()
+                        .insert(0, name.to_owned());
+                }
+            }
+        }
+
         let property = FontPropertyBuilder::new().family(name).build();
 
         if let Some((font, _)) = system_fonts::get(&property) {
             fonts
                 .font_data
                 .insert(name.to_owned(), Arc::new(FontData::from_owned(font)));
 
-            fonts
-                .families
-                .entry(FontFamily::Proportional)
-                .or_default()
-                .insert(0, name.to_owned());
-
-            fonts
-                .families
-                .entry(FontFamily::Monospace)
-                .or_default()
-                .push(name.to_owned());
-
-            // Tell egui to use these fonts:
-            ctx.set_fonts(fonts);
+            for family in [FontFamily::Proportional, FontFamily::Monospace] {
+                fonts
+                    .families
+                    .entry(family)
+                    .or_default()
+                    .insert(0, name.to_owned());
+            }
         }
+
+        // Tell egui to use these fonts:
+        ctx.set_fonts(fonts);
     }
 }
 impl eframe::App for Komobar {