no skill returns nil

apps/openmw/mwlua/types/book.cpp

@@ -19,7 +19,7 @@ namespace MWLua
         sol::table skill(context.mLua->sol(), sol::create);
         book["SKILL"] = LuaUtil::makeStrictReadOnly(skill);
         for (int id = ESM::Skill::Block; id < ESM::Skill::Length; ++id)
-            skill[(ESM::Skill::sSkillNames[id])] = id;
+            skill[Misc::StringUtils::lowerCase(ESM::Skill::sSkillNames[id])] = Misc::StringUtils::lowerCase(ESM::Skill::sSkillNames[id]);
 
         const MWWorld::Store<ESM::Book>* store = &MWBase::Environment::get().getWorld()->getStore().get<ESM::Book>();
         book["record"] = sol::overload(
@@ -35,9 +35,15 @@ namespace MWLua
         record["text"] = sol::readonly_property([](const ESM::Book& rec) -> std::string { return rec.mText; });
         record["enchant"] = sol::readonly_property([](const ESM::Book& rec) -> std::string { return rec.mEnchant; });
         record["isScroll"] = sol::readonly_property([](const ESM::Book& rec) -> bool { return rec.mData.mIsScroll; });
-        record["skill"] = sol::readonly_property([](const ESM::Book& rec) -> int { return rec.mData.mSkillId; });
         record["value"] = sol::readonly_property([](const ESM::Book& rec) -> int { return rec.mData.mValue; });
         record["weight"] = sol::readonly_property([](const ESM::Book& rec) -> float { return rec.mData.mWeight; });
         record["enchantCapacity"] = sol::readonly_property([](const ESM::Book& rec) -> float { return rec.mData.mEnchant * 0.1f; });
+        record["skill"] = sol::readonly_property([](const ESM::Book& rec) -> sol::optional<std::string>
+        { 
+            if (rec.mData.mSkillId >= 0)
+                return Misc::StringUtils::lowerCase(ESM::Skill::sSkillNames[rec.mData.mSkillId]);
+            else
+                return sol::nullopt;
+        });
     }
 }

files/lua_api/openmw/types.lua

@@ -534,33 +534,33 @@
 
 --- Book.SKILL
 -- @type BookSKILL
--- @field #number Acrobatics
--- @field #number Alchemy
--- @field #number Alteration
--- @field #number Armorer
--- @field #number Athletics
--- @field #number Axe
--- @field #number Block
--- @field #number BluntWeapon
--- @field #number Conjuration
--- @field #number Destruction
--- @field #number Enchant
--- @field #number HandToHand
--- @field #number HeavyArmor
--- @field #number Illusion
--- @field #number LightArmor
--- @field #number LongBlade
--- @field #number Marksman
--- @field #number MediumArmor
--- @field #number Mercantile
--- @field #number Mysticism
--- @field #number Restoration
--- @field #number Security
--- @field #number ShortBlade
--- @field #number Sneak
--- @field #number Spear
--- @field #number Speechcraft
--- @field #number Unarmored
+-- @field #string acrobatics "acrobatics"
+-- @field #string alchemy "alchemy"
+-- @field #string alteration "alteration"
+-- @field #string armorer "armorer"
+-- @field #string athletics "athletics"
+-- @field #string axe "axe"
+-- @field #string block "block"
+-- @field #string bluntWeapon "bluntweapon"
+-- @field #string conjuration "conjuration"
+-- @field #string destruction "destruction"
+-- @field #string enchant "enchant"
+-- @field #string handToHand "handtohand"
+-- @field #string heavyArmor "heavyarmor"
+-- @field #string illusion "illusion"
+-- @field #string lightArmor "lightarmor"
+-- @field #string longBlade "longblade"
+-- @field #string marksman "marksman"
+-- @field #string mediumArmor "mediumarmor"
+-- @field #string mercantile "mercantile"
+-- @field #string mysticism "mysticism"
+-- @field #string restoration "restoration"
+-- @field #string security "security"
+-- @field #string shortBlade "shortblade"
+-- @field #string sneak "sneak"
+-- @field #string spear "spear"
+-- @field #string speechcraft "speechcraft"
+-- @field #string unarmored "unarmored"
 
 --- @{#BookSKILL}
 -- @field [parent=#Book] #BookSKILL SKILL
@@ -582,7 +582,7 @@
 -- @field #string text The text content of the book
 -- @field #number weight
 -- @field #number value
--- @field #number skill See @{#Book.SKILL} The skill that this book teaches
+-- @field #string skill The skill that this book teaches. See @{#Book.SKILL} 
 -- @field #boolean isScroll 
 -- @field #number enchantCapacity