Using Lua from the Command Line With ... for Function

Question

I've used Lua with Corona SDK for a long time, but I only just downloaded the standalone Lua interpreter (invoked from the command line). When I use

lua main.lua

From the Mac terminal, for some reason, any functions that use (...) no longer have access to arg as their ... arguments; rather, arg now points to the command line arguments.

My question: is there a way to invoke Lua from the command line and still have functions like

local function myFunction(...)
  print(arg[1])
end

With them pointing to the their own ... arguments, not the command line ones?

possible duplicate of Getting arg to work in a varag function in Lua 5.2 (integrated in Delphi) — hjpotter92
– hjpotter92, Commented Nov 7, 2013 at 20:20
I'm reasonably sure that Corona is still Lua 5.1 based. I don't know if they feel any pressure to change, especially given that LuaJIT is still primarily 5.1 with just a few tweaks from 5.2 optionally available. — RBerteig
– RBerteig, Commented Nov 7, 2013 at 21:22

Community · Accepted Answer · 2017-05-23 10:32:14Z

1

~~What about saving those command line arguments on some variable or table just at the entry point? Example:~~

local function myFunction(...) print(cmd_arg) end -- Entry point: local cmd_arg = arg[1] myFunction()

or collecting all of command line arguments into table:

local function myFunction(...) print(cmd_arg[1]) end -- Entry point: local cmd_args = {} for _, cmd_arg in arg do table.insert(cmd_args, cmd_arg) end myFunction()

EDIT: the solution is already mentioned here: https://stackoverflow.com/a/9787126/1150918

arg appears to be deprecated since 5.1.

And Michal Kottman's solution was:

function debug(name, ...)
    local arg = table.pack(...)
    print(name)
    for i=1,arg.n do
        print(i, arg[i])
    end
end

edited May 23, 2017 at 10:32

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answered Nov 7, 2013 at 18:05

Kamiccolo

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3 Comments

Caleb P Over a year ago

Sorry for not being clearer - the above is what I don't want. I want each function to have arg point to its personal ... arguments, not the command line ones

Kamiccolo Over a year ago

@CalebP, oh, no, sorry. It's just deprecated: stackoverflow.com/questions/9786051/…

kikito Over a year ago

I must point out that calling a function debug is generally a bad idea in Lua, since it's the name of one of the standard libraries.

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