"local" copy of luakeys

[kalekje]

This might be more of a general Lua question. I have a few LaTeX packages that use luakeys, and modify the opts table to suit the need. What I would like to do with my packages is create a copy of luakeys for use within the package only. Is this possible? I think a deep-copy is needed, but am wondering otherwise. I think this would be beneficial, although memory inefficient, it would allow users to have their own luakeys interface without fear of users messing up their settings.

I might be overthinking this: would a better solution be to define a set of opts for local usage of luakeys?

Here is an example.

package.path = package.path .. ";C:\\Users\\me\\AppData\\Local\\Programs\\MiKTeX\\tex\\luatex\\luakeys\\/?.lua"

mymodule = {}

mymodule.luakeys = require'luakeys'

-- my module modifies luakeys
function toggle_bool(t)
    for k, v in pairs(t) do
        if (type(k) == 'string') and k:find( '!') then
            t[k:sub(2)] = not v
            t[k] = nil
        end
    end
end

mymodule.luakeys.opts.hooks.result=toggle_bool


t = mymodule.luakeys.parse('bold, !color')
for k, v in pairs(t) do
    print(k,v)
end


-- I want the 'pure' version of luakeys to be unchanged

luakeys = require'luakeys'

t = luakeys.parse('bold, !color')
for k, v in pairs(t) do
    print(k,v)
end

-- but luakeys points to the same object as mymodule.luakeys

[Josef Friedrich]

From the Lua manual https://www.lua.org/pil/8.1.html:

The other main job of require is to avoid loading the same file twice. For that purpose, it keeps a table with the names of all loaded files. If a required file is already in the table, require simply returns.

https://stackoverflow.com/a/2812556

mymodule.luakeys = require'luakeys'
package.loaded.luakeys = nil

[Josef Friedrich]

I added a new function to address this issue:

local my_luakeys = require('luakeys').get_new_instance()
local result = my_luakeys.parse('key=value')

local l1 = require('luakeys') -- table: 0x564ea6ca4160
local l2 = require('luakeys') -- table: 0x564ea6ca4160
local l3 = require('luakeys').get_new_instance() -- table: 0x563574d51470
local l4 = require('luakeys').get_new_instance() -- table: 0x563574d86ac0