I don't know how to initialize autocompletion (using rocks.nvim)

Plugins
1

This is my setup.

~/.config/nvim/rocks.toml

[plugins]
"rocks.nvim" = "2.42.2"
nvim-cmp = "scm"
cmp-buffer = "scm"
cmp-nvim-lsp = "scm"

...

~/.config/nvim/plugin/autocompletion/init.lua

require('cmp').setup()
require('cmp_nvim_lsp').setup()
2

Autocompletion without configuration doesn’t work.

~/.config/nvim/plugin/autocompletion/init.lua

require('cmp').setup({
snippet = {
    expand = function(args)
      vim.snippet.expand(args.body)
    end,
  },
  mapping = {
    ['<S-Tab>'] = cmp.mapping.select_prev_item(),
    ['<Tab>'] = cmp.mapping.select_next_item(),
    ['<C-S-f>'] = cmp.mapping.scroll_docs(-4),
    ['<C-f>'] = cmp.mapping.scroll_docs(4),
    ['<C-Space>'] = cmp.mapping.complete(),
    ['<C-e>'] = cmp.mapping.close(),
    ['<CR>'] = cmp.mapping.confirm({
      behavior = cmp.ConfirmBehavior.Insert,
      select = true,
    })
  },
  sources = {
    { name = 'path' },
    { name = 'nvim_lsp', keyword_length = 3 },
    { name = 'buffer', keyword_length = 2 },
  },
})
require('cmp_nvim_lsp').setup()