memo

def listdir(path):
    '''list only directories in a path'''
    return [_ for _ in os.listdir(path) if os.path.isdir(os.path.join(path, _))]
    
    
def get_hipname():
    '''return current HIP name'''
    return hou.expandString('$HIPNAME')
    
    
def menu_from_list(l):
    '''
    return a list suitable for displaying as a dropdown menu
    i.e. each item is listed twice 
    '''
    return [x for x in l for _ in (0, 1)]

    
    
def get_path(node):
    '''construct the path to search'''
    root_folder = node.parm('root_folder').eval()
    name = node.parm('name').eval()
    path = os.path.join(root_folder, name)
    return path

    
def menu_from_dirlist(node):
    '''
    given a root directory path,
    return folder contents suitable for displaying as a dropdown menu,
    '''
    path = get_path(node)
    try:
        l = menu_from_list(listdir(path))
    except:
        l = []
        pass
        
    hipname = get_hipname()
    if hipname in l:    # if current hipname is in the list, add info that it's current
        # add to next index, because first occurence is value, second occurence is label
        l[l.index(hipname) + 1] += ' (Current HIP file)'
    else: # if not found, add it to the top as current
        l = ['$HIPNAME', f'{hipname} (Current HIP file, no folder available)'] + l
    update(node) # update UI
    return l
    
def update_env():
    hou.putenv('HIPBASENAME', get_hipname().split('.')[0])

    
def update(node):
    '''update UI'''
    update_env()
    path = get_path(node)
    msg = path + '\n'
    if not os.path.exists(path) or not os.path.isdir(path):
        msg += 'Directory not found\n'
    else:
        l = []
        try:
            l = listdir(path)
        except:
            pass
        msg += f'{len(l)} entries found:\n'
        msg += '\n'.join(l)
        msg += '\n'
    msg += '------\n'
    msg += f'Current HIP: {get_hipname()}\n'
    node.parm('info').set(msg)