From 4b21bd7390a67251d5d4fe8a209171601706930c Mon Sep 17 00:00:00 2001
From: David Roundy <droundy@darcs.net>
Date: Thu, 20 Sep 2007 18:12:08 +0200
Subject: add Show instance to Layout

darcs-hash:20070920161208-72aca-c7bbb3a9d7cd8f1445c89f1bf15d7302bd47896c
---
 Operations.hs | 6 ++++--
 XMonad.hs     | 4 +++-
 2 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/Operations.hs b/Operations.hs
index 45a5c1d..1b642ed 100644
--- a/Operations.hs
+++ b/Operations.hs
@@ -351,14 +351,14 @@ instance Message IncMasterN
 
 -- simple fullscreen mode, just render all windows fullscreen.
 -- a plea for tuple sections: map . (,sc)
-data Full a = Full
+data Full a = Full deriving Show
 instance Layout Full a where
     doLayout Full sc (W.Stack f _ _) = return ([(f, sc)], Nothing)
     modifyLayout Full _ = return Nothing -- no changes
 --
 -- The tiling mode of xmonad, and its operations.
 --
-data Tall a = Tall Int Rational Rational
+data Tall a = Tall Int Rational Rational deriving Show
 instance Layout Tall a where
     doLayout (Tall nmaster _ frac) r =
         return . (\x->(x,Nothing)) .
@@ -376,6 +376,8 @@ mirrorRect (Rectangle rx ry rw rh) = (Rectangle ry rx rh rw)
 
 -- | Mirror a layout, compute its 90 degree rotated form.
 data Mirror a = forall l. Layout l a => Mirror (l a)
+instance Show (Mirror a) where
+    show (Mirror l) = "Mirror "++show l
 instance Layout Mirror a where
     doLayout (Mirror l) r s = do (wrs, ml') <- doLayout l (mirrorRect r) s
                                  return (map (second mirrorRect) wrs, Mirror `fmap` ml')
diff --git a/XMonad.hs b/XMonad.hs
index f46af7a..56d7a00 100644
--- a/XMonad.hs
+++ b/XMonad.hs
@@ -132,8 +132,10 @@ atom_WM_STATE           = getAtom "WM_STATE"
 -- returns an updated 'Layout' and the screen is refreshed.
 --
 data SomeLayout a = forall l. Layout l a => SomeLayout (l a)
+instance Show (SomeLayout a) where
+    show (SomeLayout l) = show l
 
-class Layout layout a where
+class Show (layout a) => Layout layout a where
     doLayout :: layout a -> Rectangle -> Stack a -> X ([(a, Rectangle)], Maybe (layout a))
     modifyLayout :: layout a -> SomeMessage -> X (Maybe (layout a))
 
-- 
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