- logging instead of printing
- help_...() functions instead of docstring
- alias functions do_show() do_showall() to cat (and use the same autocompletions)
- class documentation
- use also key files
- unittest
- move this TODO to GH issues...:)
- autocomplete do_open()
- manage file saving
- extend do_ls() to list also non cwd
- use _build_struct() in complete_cd()
- better formatting in do_show() and do_showall()