Neolite/lua/setup/null-ls.lua

local ok, null_ls = pcall(require, "none-ls")
if not ok then
    return
end

local augroup = vim.api.nvim_create_augroup("LspFormatting", {})

null_ls.setup({
    sources = {
        null_ls.builtins.formatting.rustfmt,
        null_ls.builtins.formatting.stylua,
        null_ls.builtins.formatting.black,
        null_ls.builtins.formatting.prettier,
        null_ls.builtins.formatting.clang_format,
    },

    -- you can reuse a shared lspconfig on_attach callback here
    on_attach = function(client, bufnr)
        if client.supports_method("textDocument/formatting") then
            vim.api.nvim_clear_autocmds({ group = augroup, buffer = bufnr })
            vim.api.nvim_create_autocmd("BufWritePre", {
                group = augroup,
                buffer = bufnr,
                callback = function()
                    vim.lsp.buf.format({
                        bufnr = bufnr,
                        filter = function()
                            return client.name == "none-ls"
                        end,
                    })
                end,
            })
        end
    end,
})