local M = {}

function M.buf(bufnr, user_opts)
    bufnr = (bufnr == nil or bufnr == 0) and vim.api.nvim_get_current_buf()
        or bufnr
    local ft = vim.bo[bufnr].filetype
    if not ft or ft == "" then
        return
    end

    user_opts = user_opts or {}

    local default = require("vern.configs.default")

    local lang_opts = (user_opts or {})[ft] or {}
    local final_opts =
        vim.tbl_deep_extend("force", {}, default, user_opts, lang_opts)
    final_opts[ft] = nil
    local ok, lang_attach = pcall(require, "vern.attach." .. ft) --- like a try / catch block in c++
    if ok and type(lang_attach) == "function" then
        lang_attach(bufnr, final_opts)
    end
end

return M