first commit

lib/knife/base.lua

@@ -0,0 +1,15 @@
+return {
+    extend = function (self, subtype)
+        subtype = subtype or {}
+        local meta = { __index = subtype }
+        return setmetatable(subtype, {
+            __index = self,
+            __call = function (self, ...)
+                local instance = setmetatable({}, meta)
+                return instance, instance:constructor(...)
+            end
+        })
+    end,
+    constructor = function () end,
+}
+