feat: wrappers + api changes .new

Author: mdwagner

spec/luajit_spec.cr

@@ -0,0 +1,29 @@
+require "./spec_helper"
+require "../src/wrappers/nil"
+
+describe Luajit::Wrappers::NIL do
+  it ".setup" do
+    Luajit.run do |state|
+      Luajit::Wrappers::NIL.setup(state)
+
+      state.execute(<<-LUA).ok?.should be_true
+      local x = NIL
+      assert(type(x) == 'userdata')
+      assert(x ~= nil)
+      assert(tostring(x) == 'NIL')
+      LUA
+    end
+  end
+
+  it ".is_nil?" do
+    Luajit.run do |state|
+      Luajit::Wrappers::NIL.setup(state)
+
+      state.execute("return NIL").ok?.should be_true
+      Luajit::Wrappers::NIL.is_nil?(state, -1).should be_true
+
+      state.execute("return nil").ok?.should be_true
+      Luajit::Wrappers::NIL.is_nil?(state, -1).should be_false
+    end
+  end
+end

spec/luajit_wrappers_nil_spec.cr

@@ -7,20 +7,20 @@ require "./luajit/*"
 
 module Luajit
   # :nodoc:
-  # Define Wrappers namespace
   module Wrappers
   end
 
   # Same as `LuaState.create`
-  def self.new : LuaState
-    LuaState.create
+  def self.new(defaults : Bool = false) : LuaState
+    LuaState.create.tap do |state|
+      state.open_library(:all) if defaults
+    end
   end
 
   # Same as `.new`, but also opens all Lua libraries
+  @[Deprecated("Use `.new(defaults: true)` instead")]
   def self.new_with_defaults : LuaState
-    new.tap do |state|
-      state.open_library(:all)
-    end
+    new(defaults: true)
   end
 
   # Same as `LuaState.destroy`
@@ -29,8 +29,8 @@ module Luajit
   end
 
   # Yields a new `LuaState` and closes it at end of block
-  def self.run(& : LuaState ->) : Nil
-    state = new_with_defaults
+  def self.run(defaults : Bool = true, & : LuaState ->) : Nil
+    state = new(defaults: defaults)
     begin
       yield state
     ensure
@@ -107,31 +107,4 @@ module Luajit
     ud_ptr = state.get_userdata(index, type.metatable)
     Box(T).unbox(ud_ptr)
   end
-
-  # Sets `NIL` as a global value with metatable name *mt_name*
-  #
-  # See `.is_global_nil?`
-  def self.setup_global_nil(state : LuaState, mt_name = "luajit_cr::__NIL__") : Nil
-    state.new_userdata(0_u64)
-    state.push({
-      "__tostring" => Luajit::LuaState::Function.new { |__state|
-        __state.push("NIL")
-        1
-      }
-    })
-    state.push_value(-1)
-    state.set_registry(mt_name)
-    state.set_metatable(-2)
-    state.set_global("NIL")
-  end
-
-  # Checks if value at *index* is the global `NIL` value with metatable name *mt_name*
-  def self.is_global_nil?(state : LuaState, index : Int32, mt_name = "luajit_cr::__NIL__") : Bool
-    begin
-      state.check_userdata!(index, mt_name)
-      true
-    rescue LuaError
-      false
-    end
-  end
 end

src/io.cr

@@ -0,0 +1,10 @@
+require "../luajit"
+
+class Luajit::Wrappers::IO < Luajit::LuaObject
+  global_name "IO"
+  metatable_name "__IO__"
+
+  def self.setup(state : Luajit::LuaState) : Nil
+    Luajit.create_lua_object(state, self)
+  end
+end

src/luajit.cr

@@ -0,0 +1,4 @@
+---@meta _
+
+---@class (exact) IO
+IO = {}