Lua, Altered Program Flow When Rquired File isn't there

Question

I want to test to see if a require'd file is there or not.

At the present, when I execute this command in Lua:

require "File_That_May_or_May_Not_Be_There.inc"

All is well if he's there. If not, my script is dead on the spot.

Is there a way for me to recover from this ?

I looked HERE on the Lua.Org site and HERE on StackOverflow and haven't seen this answered.

Is there a way to do something like this ?...

if (this_exists("That_File")) then
    require "That_File"
else
    print "Your file does not exist"
end

I'm trying to let the user have a little better idea of what went wrong, and why.

Answer 1

Use pcall.

local ok, mod = pcall(require, "That_File")

Answer 2

If you don't need to use require, which looks for modules in several locations, you can use

local f,e=loadfile(filename)
if f==nil then
  print(e)
else
  f()
end