feat: add AchievementEntry:GetName() (#104)

src/LuaEngine/AchievementMethods.h

@@ -10,7 +10,7 @@
 namespace LuaAchievement
 {
     /**
-     * Returns the [Achievement]s ID
+     * Returns the [Achievement]'s ID.
      *
      * @return uint32 id
      */
@@ -19,5 +19,36 @@ namespace LuaAchievement
         Eluna::Push(L, achievement->ID);
         return 1;
     }
+
+    /**
+     * Returns the [Achievement]'s name.
+     *
+     *     enum LocaleConstant
+     *     {
+     *         LOCALE_enUS = 0,
+     *         LOCALE_koKR = 1,
+     *         LOCALE_frFR = 2,
+     *         LOCALE_deDE = 3,
+     *         LOCALE_zhCN = 4,
+     *         LOCALE_zhTW = 5,
+     *         LOCALE_esES = 6,
+     *         LOCALE_esMX = 7,
+     *         LOCALE_ruRU = 8
+     *     };
+     *
+     * @param [LocaleConstant] locale = DEFAULT_LOCALE : locale to return the [Achievement] name in
+     * @return string name
+     */
+    int GetName(lua_State* L, AchievementEntry* const achievement)
+    {
+        uint8 locale = Eluna::CHECKVAL<uint8>(L, 2, DEFAULT_LOCALE);
+        if (locale >= TOTAL_LOCALES)
+        {
+            return luaL_argerror(L, 2, "valid LocaleConstant expected");
+        }
+
+        Eluna::Push(L, achievement->name[locale]);
+        return 1;
+    }
 };
 #endif

src/LuaEngine/LuaFunctions.cpp

@@ -1355,6 +1355,7 @@ ElunaRegister<ChatHandler> ChatHandlerMethods[] =
 ElunaRegister<AchievementEntry> AchievementMethods[] =
 {
     { "GetId", &LuaAchievement::GetId },
+    { "GetName", &LuaAchievement::GetName },
 
     { NULL, NULL }
 };