How to debug Lua program?

[commo...@tutanota.com]

I am tracing a Lua project (https://github.com/Nymphium/eff.lua) with the env - Lua 5.1, vscode 1.96.4, Debian trixie/ sid. Initially I inserted print command in the  the project related code. Though it works ok, several parts which reference to Lua table objects inside eff.lua project I do not know how to check the encapsulated values inside those tables. The console merely prints info such as table: 0x55fce37509c0. Therefore, I appreciate if any advice on how to debug Lua program.

First, I attempted to install Lua Debug (https://marketplace.visualstudio.com/items?itemName=actboy168.lua-debug). Then, configuring launch.json

{

   "version": "0.2.0",

    "configurations": [

        {

            "type": "lua",

            "request": "launch",

            "name": "Launch",

            "program": "${workspaceFolder}/test1.lua"

        }

    ]

}

The test1.lua is as below

local eff = require('src/eff')

local inst, perform, handler = eff.inst, eff.perform, eff.handler

local Choice = inst()

local always_right = handler {

    val = function(arg) print("printh ended and args are:", arg) end,

    [Choice] = function(continue_fn, left, right)

        return continue_fn(right)

    end

}

always_right(function()

    print(perform(Choice(3, 4)) + 3)

end)

But after placing several breakpoints and clicking Run > Start Debugging, vscode flashes and immediately finishes as if nothing happened. And no messages - either success or failure - are shown in Debug Console.

I can run the test1.lua by executing the command lua test1.lua within the cloned directory.

+ eff.lua (cloned dir)

  - test1.lua

  + src/eff.lua

The result is something like this

Inside perform e.eff     table: 0x55fce37509c0 -- I want to check what's inside e.eff, but print(e.eff) or print(e.eff[1]) or print(e.eff[2]) shows table: 0x55fce37509c0 or nil or nil

Inside handler left:  3       right:  4

7

printh ended and args are:      nil

If not debugging through vscode, any recommended tutorials or steps that I should check or follow?

Many thanks

[Jorge Rezende]

you need to setup the lua path and lua c path in you debugger conf 

Just read this tutorial, it is in portuguese but you can translate it with google or chat gpt...

https://luaverse.com/lua-como-debugar-projetos-lua-no-vscode/ 

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[commo...@tutanota.com]

Thanks this is working!

Jan 24, 2025, 22:27 by jorgeluis...@gmail.com:

To view this discussion visit https://groups.google.com/d/msgid/lua-l/CAH1ZxrKuxnuNmBeV%3D42-9PdBkyWMZc38tYu29KpU24gkY88TEQ%40mail.gmail.com.

[Denis Dos Santos Silva]

zerobrane is a good choice.

https://studio.zerobrane.com/