This is a convenience module in order to have less import noise. It
re-exports the following:
a) Commonly used modules in full (Data.Foldable, Data.Applicative, and
so on); though only those that play nicely with each other, so that
XMonad.Prelude can be imported unqualified without any problems.
This prevents things like `Prelude.(.)` and `Control.Category.(.)`
fighting with each other.
b) Helper functions that don't necessarily fit in any other module;
e.g., the often used abbreviation `fi = fromIntegral`.
Starting with 5240116f3c we only support
GHC versions 8.4.4 and up (more precisely, the GHC version associated
with stackage lts-12 and up). The imports in question are now in
Prelude and need not be imported explicitly.
The module implements a proper way of finding out whether the window is
remote or local.
Just checking for a hostname and WM_CLIENT_MACHINE being equal is often
not enough because the hostname is a changing subject (without any
established notification mechanisms), and thus WM_CLIENT_MACHINE and the
hostname can diverge even for a local window.
This module solves the problem. As soon as there is a new window created,
we check the hostname and WM_CLIENT_MACHINE, and then we cache the result
into the XMONAD_REMOTE property.
Notice that XMonad itself does not know anything about hostnames, nor does
it have any dependency on Network.* modules. For this module it is not a
problem: you can provide a mean to get the hostname through your config
file (see usage). Or, if you don't like the hassle of handling dynamic
hostnames (suppose your hostname never changes), it is also fine: this
module will fallback to using environment variables.