Implement debugger hook

debugger.lua

@@ -0,0 +1,27 @@
+local function execDebug()
+  local input = io.input()
+  local result = { pcall(input.read, input, "*l") }
+  if not result[1] then
+    return false, result[2]
+  end
+
+  local func = load("return " .. result[2])
+  if type(func) ~= "function" then
+    return false, func
+  end
+
+  return pcall(func)
+end
+
+local function debugREPL(onResult)
+  local result, retval
+  repeat
+    result, retval = execDebug()
+    if result and type(onResult) == "function" then
+      onResult(retval)
+    end
+  until not result
+  return retval
+end
+
+return { debugREPL = debugREPL, execDebug = execDebug }