Impelement dangling win32api to get language name

Author: MahBoiDeveloper

src/Windows/Locale.cpp

@@ -0,0 +1,57 @@
+#include <QString>
+#include <QVector>
+#include <QByteArray>
+#include <windows.h>
+
+#include "../StringExt.hpp"
+#include "Locale.hpp"
+
+namespace Windows
+{
+    /// @brief Returns full locale name by the given partial name (e.g. "en" -> "en-US")
+    QString Locale::GetFullLocaleName(const QString& partial)
+    {
+        std::wstring wpartial = partial.toStdWString();
+        WCHAR name[LOCALE_NAME_MAX_LENGTH] = {};
+
+        // Try as-is first
+        if (GetLocaleInfoEx(wpartial.c_str(), LOCALE_SNAME, name, LOCALE_NAME_MAX_LENGTH))
+            return partial;
+
+        // Collect all locales
+        std::vector<std::wstring> locales;
+        EnumSystemLocalesEx([](LPWSTR lpLocaleString, DWORD, LPARAM lParam) -> BOOL {
+            auto* locales = reinterpret_cast<std::vector<std::wstring>*>(lParam);
+            locales->emplace_back(lpLocaleString);
+            return TRUE;
+        }, LOCALE_ALL, reinterpret_cast<LPARAM>(&locales), nullptr);
+
+        // Find one that starts with the partial name
+        for (const auto& loc : locales) {
+            if (_wcsnicmp(loc.c_str(), wpartial.c_str(), wpartial.size()) == 0)
+                return QString::fromStdWString(loc);
+        }
+
+        return StringExt::EmptyString;
+    }
+
+    /// @brief Returns English language name (e.g. "en-US" -> "English")
+    QString Locale::LanguageName(const QString& partial)
+    {
+        QString locale = GetFullLocaleName(partial);
+        
+        if (locale.isEmpty())
+            return StringExt::EmptyString;
+
+        std::wstring wlocale = locale.toStdWString();
+        WCHAR buffer[100] = {};
+
+        if (GetLocaleInfoEx(wlocale.c_str(), LOCALE_SENGLISHLANGUAGENAME,
+                            buffer, static_cast<int>(std::size(buffer))))
+        {
+            return QString::fromWCharArray(buffer);
+        }
+
+        return StringExt::EmptyString;
+    }
+}

src/Windows/Locale.hpp

@@ -0,0 +1,12 @@
+#pragma once
+#include <QString>
+
+namespace Windows
+{
+    class Locale final
+    {
+    public:
+        static QString GetFullLocaleName(const QString& partial);
+        static QString LanguageName(const QString& part);
+    };
+}