Initial import of TilePrime

This layout provides a standard tiling layout with support for resize hints
and filling the gaps created by them.

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+-- --------------------------------------------------------------------------
+-- -- |
+-- -- Module      :  TilePrime.hs
+-- -- Copyright   :  (c) Eric Mertens 2007
+-- -- License     :  BSD3-style (see LICENSE)
+-- --
+-- -- Maintainer  :  emertens@gmail.com
+-- -- Stability   :  unstable
+-- -- Portability :  not portable
+-- --
+-- -- TilePrime. Tile windows filling gaps created by resize hints
+-- --
+-- -----------------------------------------------------------------------------
+--
+
+module XMonadContrib.TilePrime (TilePrime(TilePrime)) where
+
+import Control.Monad (mplus)
+import Data.List (genericLength)
+import Graphics.X11.Xlib
+import Graphics.X11.Xlib.Extras (getWMNormalHints)
+import Operations
+import XMonad hiding (trace)
+import qualified StackSet as W
+import {-#SOURCE#-} Config (borderWidth)
+
+data TilePrime a = TilePrime
+                         { nmaster     :: Int
+                         , delta, frac :: Rational
+                         , flipped     :: Bool
+                         } deriving (Show, Read)
+
+instance LayoutClass TilePrime Window where
+  description _ = "TilePrime"
+
+  pureMessage c m = fmap resize (fromMessage m) `mplus`
+                    fmap incmastern (fromMessage m)
+    where
+    resize Shrink = c { frac = max 0 $ frac c - delta c }
+    resize Expand = c { frac = min 1 $ frac c + delta c }
+    incmastern (IncMasterN d) = c { nmaster = max 0 $ nmaster c + d }
+
+  doLayout c rect s = do
+    let flp = flipped c
+    let xs = W.integrate s
+    hints <- withDisplay $ \ disp -> io (mapM (getWMNormalHints disp) xs)
+    let xs' = zip xs hints
+        (leftRect, rightRect)
+          | flp       = splitVerticallyBy (frac c) rect
+          | otherwise = splitHorizontallyBy (frac c) rect
+        masters = fillWindows flp leftRect (take (nmaster c) xs')
+        slaves  = fillWindows flp rightRect (drop (nmaster c) xs')
+    return (masters ++ slaves, Nothing)
+
+    where
+
+    fillWindows _ _ [] = []
+    fillWindows flp r ((x,hint):xs) = (x,r') : fillWindows flp rest xs
+      where
+      n = 1 + genericLength xs :: Rational
+
+      (alloca, _) | flp       = splitHorizontallyBy (recip n) r
+                  | otherwise = splitVerticallyBy (recip n) r
+
+      (w,h) = applySizeHints hint `underBorders` (rect_width alloca, rect_height alloca)
+
+      r'   = r { rect_width = w, rect_height = h }
+
+      rest | flp       = r { rect_x      = rect_x r + toEnum (fromEnum w)
+                           , rect_width  = rect_width r - w }
+           | otherwise = r { rect_y      = rect_y r + toEnum (fromEnum h)
+                           , rect_height = rect_height r - h }
+
+-- | Transform a function on dimensions into one without regard for borders
+underBorders :: (D -> D) -> D -> D
+underBorders f = adjBorders 1 . f . adjBorders (-1)
+
+-- | Modify dimensions by a multiple of the current borders
+adjBorders             :: Dimension -> D -> D
+adjBorders mult (w,h)  = (w+2*mult*borderWidth, h+2*mult*borderWidth)