How to add directories to search for modules in Lua?

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I’m having a problem with require function, I want her to look for a moon file, but I don’t want to specify the folder, and my moon is installed on another disk, I’ll put a photo to see the errorinserir a descrição da imagem aqui

As you can see the highlighted part is the file I want to use, is in the lib folder in the corner, I gave a C cd: in the terminal to test some things and I saw that this giving error, I think I just have to specify the disc, however i do not want to specify the folder because on someone else’s computer will not work, why the folder will have different name, then how can I do?

lua require

  • You should not specify only the relative path of the file, in case Lib\\BibliotecaPadrao?

  • yes and did it, however it gives the same error q i think q eh prq just look in the same drive of the moon installed, and eh why I asked if it has how to say I want q look in the two drives or only in C:\

1 answer

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Lua searches the modules using the variable package.path which in turn is started by reading a system variable called LUA_PATH.

To add a new place to search for modules just change one of these variables.

If you want the folder to be always available you will want to edit the LUA_PATH.

In Windows vc should go to System | Advanced System Settings | Environment Variables and add the LUA_PATH or edit if it already exists. In Linux you will put this setup in your .bashrc.

Ex:

LUA_PATH = ;;D:\libs\lua\?.lua

The ;; at the beginning makes the moon load the default libs at the beginning of the path. Note that you have a query ? in Pattern. It serves to mark the place where you will enter what you type in require.

Ex: Consider this directory structure:

D:
|- libs
    |- lua
        |- math
            |- linearAlgebra.lua

With the LUA_PATH defined as above you can do so in your moon code:

local la = require "math.linearAlgebra"
local v = la.dot({1, 0}, {1, 2})
...

The convention is to use a dot . where there would be a directory separator (so math.linearAlgebra and not math\\linearAlgebra)

And also note that the .lua is not specified as it has already been defined in LUA_PATH.

If you want to add more search patterns, just separate them with ;.

And finally it’s important to know that all of this also holds true for the package.path.

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