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feat: add IsUsableSpell Lua API for spell usability checks

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Returns (usable, noMana) tuple. Checks if the spell is known and not on
cooldown. Accepts spell ID or name. Used by action bar addons and
WeakAuras for conditional spell display (greyed out when unusable).
This commit is contained in:
Kelsi 2026-03-20 18:42:33 -07:00
parent ce128990d2
commit 4bd237b654
1 changed files with 36 additions and 0 deletions
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36
src/addons/lua_engine.cpp
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@ -1194,6 +1194,41 @@ static int lua_UnitCreatureType(lua_State* L) {
return 1;
}
// IsUsableSpell(spellIdOrName) → usable, noMana
static int lua_IsUsableSpell(lua_State* L) {
auto* gh = getGameHandler(L);
if (!gh) { lua_pushboolean(L, 0); lua_pushboolean(L, 0); return 2; }
uint32_t spellId = 0;
if (lua_isnumber(L, 1)) {
spellId = static_cast<uint32_t>(lua_tonumber(L, 1));
} else if (lua_isstring(L, 1)) {
const char* name = lua_tostring(L, 1);
if (!name || !*name) { lua_pushboolean(L, 0); lua_pushboolean(L, 0); return 2; }
std::string nameLow(name);
for (char& c : nameLow) c = static_cast<char>(std::tolower(static_cast<unsigned char>(c)));
for (uint32_t sid : gh->getKnownSpells()) {
std::string sn = gh->getSpellName(sid);
for (char& c : sn) c = static_cast<char>(std::tolower(static_cast<unsigned char>(c)));
if (sn == nameLow) { spellId = sid; break; }
}
}
if (spellId == 0 || !gh->getKnownSpells().count(spellId)) {
lua_pushboolean(L, 0);
lua_pushboolean(L, 0);
return 2;
}
// Check if on cooldown
float cd = gh->getSpellCooldown(spellId);
bool onCooldown = (cd > 0.1f);
lua_pushboolean(L, onCooldown ? 0 : 1); // usable (not on cooldown)
lua_pushboolean(L, 0); // noMana (can't determine without spell cost data)
return 2;
}
// IsInInstance() → isInstance, instanceType
static int lua_IsInInstance(lua_State* L) {
auto* gh = getGameHandler(L);
@ -1622,6 +1657,7 @@ void LuaEngine::registerCoreAPI() {
{"UnitIsEnemy", lua_UnitIsEnemy},
{"UnitCreatureType", lua_UnitCreatureType},
{"UnitClassification", lua_UnitClassification},
{"IsUsableSpell", lua_IsUsableSpell},
{"IsInInstance", lua_IsInInstance},
{"GetInstanceInfo", lua_GetInstanceInfo},
{"GetInstanceDifficulty", lua_GetInstanceDifficulty},