import streamlit as st
import os


fingermodel_trans = {
    '一般抓握': 'flex',
    '柱状抓握': 'cylinder',
    '球状抓握': 'ball',
    '两指对捏': 'double',
    '三指对捏': 'treble'
}


def file_selector(folder_path='.'):
    try:
        os.mkdir(folder_path)
    except FileExistsError:
        pass
    filenames = os.listdir(folder_path)
    filenames = filter(lambda x: x.endwith('.pkl'), filenames)
    selected_filename = st.selectbox('Select a file', filenames)
    if selected_filename is not None:
        return os.path.join(folder_path, selected_filename)
    else:
        return None