fix: Theme detection issues on all OSes

lib/libimhex/include/hex/helpers/utils_macos.hpp

@@ -5,5 +5,6 @@
     #include <string>
 
     extern "C" void openWebpageMacos(const char *url);
+    extern "C" bool isMacosSystemDarkModeEnabled();
 
 #endif

lib/libimhex/source/helpers/utils_macos.m

@@ -13,4 +13,15 @@
         CFRelease(urlRef);
     }
 
+    bool isMacosSystemDarkModeEnabled() {
+        NSString * appleInterfaceStyle = [[NSUserDefaults standardUserDefaults] stringForKey:@"AppleInterfaceStyle"];
+
+        if (appleInterfaceStyle && [appleInterfaceStyle length] > 0) {
+            return [[appleInterfaceStyle lowercaseString] containsString:@"dark"];
+        } else {
+            return false;
+        }
+    }
+}
+
 #endif

main/source/window/linux_window.cpp

@@ -38,7 +38,7 @@ namespace hex {
             auto exitCode = WEXITSTATUS(pclose(pipe));
             if (exitCode != 0) return;
 
-            EventManager::post<RequestChangeTheme>(hex::containsIgnoreCase(result, "dark") ? 1 : 2);
+            EventManager::post<RequestChangeTheme>(hex::containsIgnoreCase(result, "light") ? 2 : 1);
         });
 
         if (themeFollowSystem)

main/source/window/macos_window.cpp

@@ -5,6 +5,7 @@
     #include <hex/api/content_registry.hpp>
     #include <hex/api/event.hpp>
 
+    #include <hex/helpers/utils_macos.hpp>
     #include <hex/helpers/logger.hpp>
 
     #include <nlohmann/json.hpp>
@@ -23,8 +24,10 @@ namespace hex {
         EventManager::subscribe<EventOSThemeChanged>(this, [themeFollowSystem] {
             if (!themeFollowSystem) return;
 
-            // TODO: Implement this when MacOS build is working again
-            EventManager::post<RequestChangeTheme>(1);
+            if (!isMacosSystemDarkModeEnabled())
+                EventManager::post<RequestChangeTheme>(2);
+            else
+                EventManager::post<RequestChangeTheme>(1);
         });
 
         if (themeFollowSystem)

plugins/windows/source/plugin_windows.cpp

@@ -34,6 +34,8 @@ static void detectSystemTheme() {
             auto error = RegQueryValueEx(hkey, "AppsUseLightTheme", nullptr, nullptr, reinterpret_cast<LPBYTE>(&value), &size);
             if (error == ERROR_SUCCESS) {
                 EventManager::post<RequestChangeTheme>(value == 0 ? 1 : 2);
+            } else {
+                EventManager::post<RequestChangeTheme>(1);
             }
         }
     });