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Overview
========
The main component is :class:`alot.ui.UI`, which provides methods for user input and notifications,
sets up an :mod:`urwid` :class:`mainloop <urwid.main_loop.TwistedEventLoop>` and widget tree and
maintains the list of active buffers. Moreover, it integrates different "managers" responsible for
core functionalities:
* a :class:`~db.DBManager` to access the email database
* an :class:`~account.AccountManager` to deal with user accounts
* a :class:`~settings.AlotConfigParser` (subclasses :class:`configparser.ConfigParser`) for user settings
Every user action, triggered either by keybindings or as input to the commandprompt, is
given as commandline string that gets :func:`translated <commands.commandfactory>`
to a :class:`~commands.Command` which is then :meth:`applied <ui.UI.apply_command>`.
Different actions are defined as a subclasses of :class:`~commands.Command`, which live
in `alot/commands/MODE.py`, where MODE is the name of the mode (:class:`Buffer` type) they
are used in.
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