Is this a safe way to preview files in Neovim with a Lua plugin? Is there a better way?

preview_file.lua

local search_buffer, search_window
local document_buffer, document_window
local storage_dir = "/Users/alans/Desktop/neovim-test-files/"

local function open_file()
    local file_name = vim.api.nvim_buf_get_lines(search_buffer, 0, 1, true)
    -- I do scrubbing to make sure the file is valid but
    -- have removed it to focus on the preview part of the example
    local file_path = storage_dir..'/'..file_name[1]
    vim.api.nvim_set_current_win(document_window)
    vim.api.nvim_command('edit ' .. file_path) 
    vim.api.nvim_set_current_win(search_window)
end

local function search_for_file()
    search_buffer = vim.api.nvim_create_buf(false, true)
    search_window = vim.api.nvim_open_win(search_buffer, true,
        {style = "minimal",relative='win', row=20, col=4, width=42, height=1}
    )

    vim.api.nvim_command('au CursorMoved,CursorMovedI <buffer> lua require"preview_file".open_file()')

    document_buffer = vim.api.nvim_create_buf(false, true)
    document_window = vim.api.nvim_open_win(document_buffer, true,
        {style = "minimal",relative='win', row=23, col=4, width=42, height=5}
    )
    vim.api.nvim_set_current_win(search_window)

end

return {
    open_file = open_file,
    search_for_file = search_for_file
}