:date: 2019-02-07

==========================
Thursday, February 7, 2019
==========================

I started to implement the new :mod:`lino_xl.lib.files` plugin for
:ticket:`2826` and --as usual-- my original plan changed. E.g. volumes are not
stored in a choicelist but in a database table. And the funniest: we don't even
need a files plugin, we just add a :class:`Volume` model to
:mod:`lino.modlib.uploads` and two fields to the
:class:`lino.modlib.uploads.Upload` model!  The filenames of the combobox are
simply generated for every request using :func:`os.walk`. See tomorrow for a
summary of the changes.

.. I  realized that the :mod:`lino_xl.lib.files` plugin will actually "collaborate"
   with the uploads plugin : when it is installed, an upload will have a third
   possibility.

Did you know that there are two variants of the upload plugin:

- :ref:`avanti` and :ref:`welfare` use :mod:`lino_xl.lib.uploads`
- :ref:`voga` uses :mod:`lino.modlib.uploads`

:mod:`lino_xl.lib.uploads` extends the core variant by adding a valididty date
and reminders.  We won't need this for :ref:`cosi`.


I had to refresh my memory about :func:`os.walk`::

    cd /home/luc
    mkdir shared
    mkdir shared/foo
    mkdir shared/foo/bar
    touch shared/index.txt
    touch shared/foo/index.txt
    touch shared/foo/bar/index.txt
    touch shared/foo/bar/baz.txt


>>> import os
>>> for (root, dirs, files) in os.walk("/home/luc/shared"):
...     print(root, dirs, files)
('/home/luc/shared', ['foo'], ['index.txt'])
('/home/luc/shared/foo', ['bar'], ['index.txt'])
('/home/luc/shared/foo/bar', [], ['baz.txt', 'index.txt'])