[Lua][Error] Attempt to index ? (a nil value)

function include(localP)
   path = shell.resolve(localP)
   local f = fs.open(path, 'r')
   local str = f.readAll()
   f.close()

   local tbl = loadstring(str)()
   return tbl
end

local updater = include('apis/updater')

local runningDir = shell.getRunningProgram()
return {
	testF = function()
		return 'hello world'
	end,
}

string:1: attempt to index ? (a nil value)

local tbl = loadstring(str)()

Shazz, on 09 May 2013 - 07:34 PM said:

Yeah, I figured it had something to do with loadstring() since this is my first time using it.
Is there any way that I can approach the include function in a way that allows me to still use all the APIs?

local function include(f)
  --[[local file = fs.open(f, "r")
  local c = file.readAll()
  file.close()]] There's no need for all of this. Just use loadfile.

  local tEnv = {} --Create the environment we'll store the file functions in
  setmetatable(tEnv, {__index = _G}) --Set the __index metamethod of tEnv so that when we try to call something that doesn't exist in the loadfile env (shell.getRunningProgram, for example), it will access the values in _G instead
  local api = loadfile(f)
  setfenv(api, tEnv) --Go ahead and set the environment of the loaded code to our tEnv
  api() --Run it
  return tEnv --Return the table
end

Bubba, on 09 May 2013 - 07:42 PM said:

-snip-

Shazz, on 09 May 2013 - 08:10 PM said:

Bubba, on 09 May 2013 - 07:42 PM said:

-snip-

Still get the same error for some reason.

function include(_f)
  local f = shell.resolve(_f)
  if not fs.exists(f) then
	return false, "That file does not exist!"
  end

  local tEnv = {}
  setmetatable(tEnv, {__index = _G})
  local loaded = loadfile(f)
  setfenv(loaded, tEnv)
  loaded()

  return tEnv
end


local test = include "/test2" --Here's my test: it worked perfectly fine for me

for i,v in pairs(test) do
  print(i..": "..tostring(v))
end

Bubba, on 09 May 2013 - 08:11 PM said:

Shazz, on 09 May 2013 - 08:10 PM said:

Bubba, on 09 May 2013 - 07:42 PM said:

-snip-

Still get the same error for some reason.

Really? That's strange. I tried it and it's working fine for me.

Here's the code again in case I typed something up wrong:

function include(_f)
  local f = shell.resolve(_f)
  if not fs.exists(f) then
	return false, "That file does not exist!"
  end

  local tEnv = {}
  setmetatable(tEnv, {__index = _G})
  local loaded = loadfile(f)
  setfenv(loaded, tEnv)
  loaded()

  return tEnv
end


local test = include "/test2" --Here's my test: it worked perfectly fine for me

for i,v in pairs(test) do
  print(i..": "..tostring(v))
end

Freack100, on 09 May 2013 - 08:19 PM said:

There's a little typo in the third line:
"_f" not "f" ;)/>

Shazz, on 09 May 2013 - 08:20 PM said:

Freack100, on 09 May 2013 - 08:19 PM said:

There's a little typo in the third line:
"_f" not "f" ;)/>

That's intentional, read the line above it.

@Bubba: Did you put shell.getRunningProgram() (or any other Shell API function) in your test file?

function test()
  print(shell.getRunningProgram())
end

test: function: 2cc7d960

local test = include('/test2')
test.test()

local tEnv = {shell=shell}

Bubba, on 09 May 2013 - 08:40 PM said:

Okay, I'm really derping today. You can easily load shell yourself by doing this:

local tEnv = {shell=shell}

But I'm not 100% sure why the setmetatable bit isn't working as it should. Oh well, doing the above code fixes the problem.