Flash neovim cursorline (just for a second)

nvim_flash_cursorline.lua

-- in your utils.lua
local M = {}

-- https://vi.stackexchange.com/questions/31206
M.flash_cursorline = function()
    vim.opt.cursorline = true
    vim.cmd([[hi CursorLine guifg=#000000 guibg=#ffffff]])
    vim.fn.timer_start(200, function()
        vim.cmd([[hi CursorLine guifg=NONE guibg=NONE]])
        vim.opt.cursorline = false
    end)
end

return M

-- in your mappings.lua
-- map helper
local function map(mode, lhs, rhs, opts)
    local options = {noremap = true}
    if opts then options = vim.tbl_extend('force', options, opts) end
    vim.api.nvim_set_keymap(mode, lhs, rhs, options)
end

map('n', 'n', 'nzz')
map('n', 'N', 'Nzz')
map('n', '<c-o>', '<c-o>zz:lua require("utils").flash_cursorline()<cr>', { silent = true})
map('n', '<c-i>', '<c-i>zz:lua require("utils").flash_cursorline()<cr>', { silent = true})
map('n', '}', '}zz')
map('n', '{', '{zz')

-- in your autocmd.lua
--- This function is taken from https://github.com/norcalli/nvim_utils
function nvim_create_augroups(definitions)
    for group_name, definition in pairs(definitions) do
        vim.api.nvim_command('augroup '..group_name)
        vim.api.nvim_command('autocmd!')
        for _, def in ipairs(definition) do
            local command = table.concat(vim.tbl_flatten{'autocmd', def}, ' ')
            vim.api.nvim_command(command)
        end
        vim.api.nvim_command('augroup END')
    end
end

local autocmds = {
    reload_vimrc = {
        -- Reload vim config automatically
        -- {"BufWritePost",[[$VIM_PATH/{*.vim,*.yaml,vimrc} nested source $MYVIMRC | redraw]]};
        {"BufWritePre", "$MYVIMRC", "lua require('utils').ReloadConfig()"};
    };

-- a lot of autocommands
    flash_cursor_line = {
       { "WinEnter", "*", [[lua require('utils').flash_cursorline()]]}
    };
}

nvim_create_augroups(autocmds)