-- remove trailing whitespace
function my_remove_trailing_whitespace()
    local curpos = vim.api.nvim_win_get_cursor(0)
    vim.cmd([[keeppatterns %s/\s\+$//e]])
    vim.api.nvim_win_set_cursor(0, curpos)
end

vim.api.nvim_create_autocmd(
    { 'BufWritePre' },
    {
        pattern = {
            '*.lua', '*.cpp', '*.hpp'
        },
        callback = my_remove_trailing_whitespace
    }
)