detect system locale

src/util/platform.cpp

@@ -3,11 +3,15 @@
 #include <sstream>
 #include <iomanip>
 #include <time.h>
+#include <iostream>
 
 #include "../typedefs.h"
 
-#define SETTINGS_FILE "settings.toml"
-#define CONTROLS_FILE "controls.json"
+namespace platform {
+    const std::string SETTINGS_FILE = "settings.toml";
+    const std::string CONTROLS_FILE = "controls.json";
+    const std::string DEFAULT_LOCALE = "en_EN";
+}
 
 using std::filesystem::path;
 
@@ -20,25 +24,53 @@ path platform::get_controls_file() {
 	return path(CONTROLS_FILE);
 }
 
-std::string platform::detect_locale() {
-    // TODO: implement
-    std::string name = setlocale(LC_ALL, nullptr);
-    if (name.find("ru_RU") != std::string::npos) {
+/*System locale to engine locale mapping*/
+std::string platform::get_locale_by_lang(std::string lang) {
+    if (lang == "ru") {
         return "ru_RU";
     }
-    return "en_US";
+    return DEFAULT_LOCALE;
 }
 
 #ifdef WIN32
 #include <Windows.h>
 
+#include "../util/stringutil.h"
+
 void platform::configure_encoding() {
 	// set utf-8 encoding to console output
 	SetConsoleOutputCP(CP_UTF8);
     setvbuf(stdout, nullptr, _IOFBF, 1000);
 }
+
+std::string platform::detect_locale() {
+    LCID lcid = GetThreadLocale();
+    wchar_t preferredLocaleName[LOCALE_NAME_MAX_LENGTH];
+    if (LCIDToLocaleName(lcid, preferredLocaleName, LOCALE_NAME_MAX_LENGTH, 0) == 0) {
+        std::cout << "error in platform::detect_locale! LCIDToLocaleName failed." << std::endl;
+    }
+    wchar_t parentLocaleName[LOCALE_NAME_MAX_LENGTH];
+    if (GetLocaleInfoEx(preferredLocaleName, LOCALE_SPARENT, parentLocaleName, LOCALE_NAME_MAX_LENGTH) == 0){
+        std::cout << "error in platform::detect_locale! GetLocaleInfoEx failed." << std::endl;
+    }
+    std::wcout << "detected environment language locale: " << parentLocaleName << std::endl;
+
+    std::string preferredLang = util::wstr2str_utf8(parentLocaleName);
+    return get_locale_by_lang(preferredLang);
+}
+
 #else
 void platform::configure_encoding(){
 }
 
+std::string platform::detect_locale() {
+    std::string programLocaleName = setlocale(LC_ALL, nullptr);
+    std::string preferredLocaleName = setlocale(LC_ALL, "");
+    std::cout << "detected environment locale: " << preferredLocaleName << std::endl;
+    setlocale(LC_ALL, programLocaleName.c_str());
+
+    std::string preferredLang = preferredLocaleName.substr(0, 2);
+    return get_locale_by_lang(preferredLang);
+}
+
 #endif

src/util/platform.h

@@ -9,6 +9,7 @@ namespace platform {
     extern std::filesystem::path get_settings_file();
     extern std::filesystem::path get_controls_file();
     extern std::string detect_locale();
+    extern std::string get_locale_by_lang(std::string lang);
 }
 
 #endif // UTIL_PLATFORM_H_