From 90d86554f871b740f6d8ce913bad5066f7aabb6b Mon Sep 17 00:00:00 2001
From: Don Stewart <dons@cse.unsw.edu.au>
Date: Tue, 5 Jun 2007 10:37:35 +0200
Subject: Enable logging of state changes to stdout

darcs-hash:20070605083735-9c5c1-1ab5acbd611914caa7b5cdf1f2df338c0ee616f8
---
 Config.hs      | 7 +++++++
 Config.hs-boot | 1 +
 Main.hs        | 3 ++-
 Operations.hs  | 6 +++---
 4 files changed, 13 insertions(+), 4 deletions(-)

diff --git a/Config.hs b/Config.hs
index fc941db..b420418 100644
--- a/Config.hs
+++ b/Config.hs
@@ -99,6 +99,13 @@ defaultLayouts = [ tiled , mirror tiled , full ]
      -- Percent of screen to increment by when resizing panes
      delta   = 3%100
 
+--
+-- Enable logging of state changes to stdout.
+-- The internal state of the window manager is 'shown' in Haskell data format
+--
+logging :: Bool
+logging = False
+
 --
 -- The key bindings list.
 -- 
diff --git a/Config.hs-boot b/Config.hs-boot
index 2d66ae1..b6868aa 100644
--- a/Config.hs-boot
+++ b/Config.hs-boot
@@ -1,3 +1,4 @@
 module Config where
 import Graphics.X11.Xlib.Types (Dimension)
 borderWidth :: Dimension
+logging     :: Bool
diff --git a/Main.hs b/Main.hs
index 8c9b485..1b2e42f 100644
--- a/Main.hs
+++ b/Main.hs
@@ -45,6 +45,7 @@ main = do
     xinesc <- getScreenInfo dpy
     nbc    <- initcolor normalBorderColor
     fbc    <- initcolor focusedBorderColor
+    hSetBuffering stdout NoBuffering
     args <- getArgs
 
     let winset | ("--resume" : s : _) <- args
@@ -89,7 +90,7 @@ main = do
                       , w  <- W.integrate (W.stack wk) ]
 
             mapM_ manage ws -- find new windows
-            -- withWindowSet (io . hPrint stderr) -- uncomment for state logging
+            when logging $ withWindowSet (io . hPrint stdout)
 
             -- main loop, for all you HOF/recursion fans out there.
             forever $ handle =<< io (nextEvent dpy e >> getEvent e)
diff --git a/Operations.hs b/Operations.hs
index 93c0da0..734935d 100644
--- a/Operations.hs
+++ b/Operations.hs
@@ -15,7 +15,7 @@ module Operations where
 
 import XMonad
 import qualified StackSet as W
-import {-# SOURCE #-} Config (borderWidth)
+import {-# SOURCE #-} Config (borderWidth,logging)
 
 import Data.Maybe
 import Data.List            (genericIndex, intersectBy, partition, delete)
@@ -168,8 +168,8 @@ windows f = do
         io $ restackWindows d (flt ++ tiled')
 
     setTopFocus
-    -- withWindowSet (io . hPrint stderr) -- logging state changes!
-    -- io performGC -- really helps 
+    when logging $ withWindowSet (io . hPrint stdout)
+    -- io performGC -- really helps, but seems to trigger GC bugs?
 
     -- We now go to some effort to compute the minimal set of windows to hide.
     -- The minimal set being only those windows which weren't previously hidden,
-- 
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