CODEWITHSUNDEEP
luaminecraftcomputercraft
BluZero
BluZero

Reputation: 39

Run script instructions from external source in Lua

Ok, I'm wanting to know if there's a way of running scripts from an external source with Lua. Be it another file in .txt format or from pastebin, what have you, and run the code and wait for said code to finish, and then continue on with the rest of the function. I'm not quite sure at all about how it'd work, but this is basically the idea I'm going by and isn't actual code.

function runStuff()
print("checking for stuff")
run.script(derp.txt)
wait for script
   if run.script == finished
   continue program
      elseif nil
   print("looks like this script sucks.")
   end
end
runStuff()

And for example what "derp.txt" contains is:

function lookFile()
   if herp.txt exists then
      rename herp.txt to herp.lua
   else
      nil
   end
end
lookFile()

I'm still new to Lua so I'm coding like a moron here, but you get my picture hopefully. I'm working on a project that'll act like an installer package for repositories based from pastebin or anywhere else that'll supply raw format outputs of lua scripts and I'm going to use that idea for it to call on scripts to run externally. So when I supply a "First Time Run" version of the program, it'll call out to a lua script that'll call to another lua script and install that script, then close.

This is for minecraft, mind you. ComputerCraft made me take interest in Lua, but anyway, hopefully you got the gist of what I'm trying to figure out. Hopefully that's doable and if not, I'll just have to figure something else out.

Upvotes: 1

Views: 2161

Answers (1)

Paul Kulchenko
Paul Kulchenko

Reputation: 26744

To load and execute a Lua code fragment you can use something like this:

local http = require("socket.http")
local response, err = http.request("url to some Lua code")
if not response then error(err) end
local f, err = (loadstring or load)(response)
if not f then error(err) end
print("done with "..response)
-- make sure you read on (in)security implications of running remote code
-- f() -- call the function based on the remote code

You probably need to use sandboxing.

Upvotes: 1

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