From 325f5bf9b6b8dbc977b993d6d874d5e066c80b51 Mon Sep 17 00:00:00 2001
From: Miikka Koskinen <arcatan@kapsi.fi>
Date: Sun, 13 May 2007 18:43:38 +0000
Subject: [PATCH] XMonadContrib.FindEmptyWorkspace

With this module you can find empty workspaces, view them and tag windows to
them.
---
 FindEmptyWorkspace.hs | 59 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 59 insertions(+)
 create mode 100644 FindEmptyWorkspace.hs

diff --git a/FindEmptyWorkspace.hs b/FindEmptyWorkspace.hs
new file mode 100644
index 00000000..efd524fd
--- /dev/null
+++ b/FindEmptyWorkspace.hs
@@ -0,0 +1,59 @@
+-----------------------------------------------------------------------------
+-- |
+-- Module      :  XMonadContrib.FindEmptyWorkspace
+-- Copyright   :  (c) Miikka Koskinen 2007
+-- License     :  BSD3-style (see LICENSE)
+--
+-- Maintainer  :  arcatan@kapsi.fi
+--
+-----------------------------------------------------------------------------
+--
+-- Find an empty workspace in xmonad.
+--
+-- To use, modify your Config.hs to:
+--
+--     import XMonadContrib.FindEmptyWorkspace
+--
+-- and add a keybinding:
+--
+--     , ((modMask,                xK_m    ), viewEmptyWorkspace)
+--     , ((modMask .|. shiftMask,  xK_m    ), tagToEmptyWorkspace)
+--
+-- Now you can jump to an empty workspace with mod-n. Mod-shift-n will
+-- tag the current window to an empty workspace and view it.
+--
+
+module XMonadContrib.FindEmptyWorkspace (
+    viewEmptyWorkspace, tagToEmptyWorkspace
+  ) where
+
+import Control.Monad.State
+import qualified Data.Map as M
+
+import XMonad
+import Operations
+import qualified StackSet as W
+
+-- | Find the first empty workspace in a WindowSet. Returns Nothing if
+-- all workspaces are in use.
+findEmptyWorkspace :: WindowSet -> Maybe WorkspaceId
+findEmptyWorkspace = findKey (([],[]) ==) . W.stacks
+
+withEmptyWorkspace :: (WorkspaceId -> X ()) -> X ()
+withEmptyWorkspace f = do
+    ws <- gets workspace
+    whenJust (findEmptyWorkspace ws) f
+
+-- | Find and view an empty workspace. Do nothing if all workspaces are
+-- in use.
+viewEmptyWorkspace :: X ()
+viewEmptyWorkspace = withEmptyWorkspace view
+
+-- | Tag current window to an empty workspace and view it. Do nothing if
+-- all workspaces are in use.
+tagToEmptyWorkspace :: X ()
+tagToEmptyWorkspace = withEmptyWorkspace $ \w -> tag w >> view w
+
+-- Thanks to mauke on #haskell
+findKey :: (a -> Bool) -> M.Map k a -> Maybe k
+findKey f = M.foldWithKey (\k a -> mplus (if f a then Just k else Nothing)) Nothing