Configure layouts on a per-host basis: use layouts and apply layout modifiers selectively, depending on the host. Heavily based on XMonad.Layout.PerWorkspace by Brent Yorgey.

You can use this module by importing it into your ~/.xmonad/xmonad.hs file:

import XMonad.Layout.OnHost

and modifying your layoutHook as follows (for example):

layoutHook = modHost "baz" m1 $            -- apply layout modifier m1 to all layouts on host "baz"
             onHost "foo" l1 $             -- layout l1 will be used on host "foo".
             onHosts ["bar","quux"] l2 $   -- layout l2 will be used on hosts "bar" and "quux".
             l3                            -- layout l3 will be used on all other hosts.

Note that l1, l2, and l3 can be arbitrarily complicated layouts, e.g. (Full ||| smartBorders $ tabbed shrinkText defaultTConf ||| ...), and m1 can be any layout modifier, i.e. a function of type (l a -> ModifiedLayout lm l a).

In another scenario, suppose you wanted to have layouts A, B, and C available on all hosts, except that on host foo you want layout D instead of C. You could do that as follows:

layoutHook = A ||| B ||| onHost "foo" D C

Note that we rely on '$HOST' being set in the environment, as is true on most modern systems; if it's not, you may want to use a wrapper around xmonad or perhaps use setEnv (or putEnv) to set it in main. This is to avoid dragging in the network package as an xmonad dependency. If '$HOST' is not defined, it will behave as if the host name never matches.

Also note that '$HOST' is usually a fully qualified domain name, not a short name. If you use a short name, this code will try to truncate $HOST to match; this may prove too magical, though, and may change in the future.