Lua Newbie stuck on simple input

Question

I'm trying to pick up Lua programming but I'm stuck on something that's probably trivial. I'm prototyping some Lua scripts using Kahlua from IntelliJ Idea 11 and I keep getting errors whenever I try to use io.read(). Here's what I currently have:

require "io"

print("input:")
a = io.read()        -- read a number
print(a)

When I run it in Idea I get "Tried to call nil at interpreter:1" If I remove the require and the blank line after it I get "input: attempted index of non-table: null at interpreter:2" What am I doing wrong?

score 2 · Accepted Answer · answered Mar 29 '12 at 21:15

2

Kahula doesn't support the io library.

Your best bet would be to set up a real Lua SDK, and use the run lua console feature.

See: http://www.screencast.com/t/0f262SeCKmqT

answered Mar 29 '12 at 21:15

sylvanaar

8,096
37
59

I finally figured the same on my own back in February. I'd been running via the console feature ever since. – Cliff Mar 29 '12 at 21:19

score 0 · Answer 2 · answered Feb 03 '12 at 16:52

0

Perhaps this? (adding local io to the beginning)

local io = require "io"

print("input:")
a = io.read()        -- read a number
print(a)

answered Feb 03 '12 at 16:52

Garrett Bluma

1,312
10
14

Nope, I think it's a bug in the plugin. The normal Lua runtime accepts all flavors of my code just fine. One of those toe-stubbers of picking up a new language by using an IDE plugin. – Cliff Feb 03 '12 at 17:01

Lua Newbie stuck on simple input

2 Answers2