LuaNimFunction = proc (L: LuaStatePtr): cint {.cdecl, ...raises: [].}

LuaStatePtr {.importc: "lua_State*".} = object

LuaType {.importc: "enum LuaType", header: "pd_api.h", bycopy.} = enum
  kTypeNil, kTypeBool, kTypeInt, kTypeFloat, kTypeString, kTypeTable,
  kTypeFunction, kTypeThread, kTypeObject

LuaUDObject {.importc: "LuaUDObject", header: "pd_api.h", bycopy.} = object

LValType {.importc: "l_valtype", header: "pd_api.h".} = enum
  kInt, kFloat, kStr

PlaydateLua {.importc: "const struct playdate_lua", header: "pd_api.h", bycopy.} = object
  pushFunction* {.importc: "pushFunction".}: proc (f: LuaNimFunction) {.cdecl.}
  stop* {.importc: "stop".}: proc () {.cdecl, ...raises: [].}
  start* {.importc: "start".}: proc () {.cdecl, ...raises: [].} ## stack operations
  ## for returning values back to Lua
  pushNil* {.importc: "pushNil".}: proc () {.cdecl, ...raises: [].}
  ## sets item on top of stack and pops it
  ## pushes item at slot to top of stack, returns stack position
  ## calling lua from C has some overhead. use sparingly!