From e1fea474888bd42f46e31cb902e3e1175b38d2dd Mon Sep 17 00:00:00 2001
From: Felix Crux <felixc@felixcrux.com>
Date: Fri, 19 Dec 2014 23:36:46 +0100
Subject: Layout.Spacing: Outer window edges now get as much spacing as inner
 ones

Ignore-this: 61363e97939fe857876c8252ac5f0302

Layout.Spacing applies a customizable amount of space around the outside of each
window. At window edges where two windows meet, the total distance between them
is therefore twice the customized value (one space value from each window). At
the edge of the screen, however, the spacing is only applied once. This results
in uneven amounts of spacing and differently-sized gaps on the screen.

This patch extends the Spacing layout to include a further gap all around the
edge of the screen, thus making all spaces around windows equal in size.

darcs-hash:20141219223646-7cf82-41539353bf5af7c54809bb7a9ff1c6a52320aa10.gz
---
 XMonad/Layout/Spacing.hs | 38 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)

diff --git a/XMonad/Layout/Spacing.hs b/XMonad/Layout/Spacing.hs
index 609c858..38ffbd5 100644
--- a/XMonad/Layout/Spacing.hs
+++ b/XMonad/Layout/Spacing.hs
@@ -18,12 +18,16 @@ module XMonad.Layout.Spacing (
                                -- $usage
 
                                spacing, Spacing,
+                               spacingWithEdge, SpacingWithEdge,
                                smartSpacing, SmartSpacing,
+                               smartSpacingWithEdge, SmartSpacingWithEdge,
 
                              ) where
 
 import Graphics.X11 (Rectangle(..))
 import Control.Arrow (second)
+import XMonad.Core (runLayout)
+import XMonad.StackSet (up, down, Workspace(..))
 import XMonad.Util.Font (fi)
 
 import XMonad.Layout.LayoutModifier
@@ -51,6 +55,21 @@ instance LayoutModifier Spacing a where
 
     modifierDescription (Spacing p) = "Spacing " ++ show p
 
+-- | Surround all windows by a certain number of pixels of blank space, and
+-- additionally adds the same amount of spacing around the edge of the screen.
+spacingWithEdge :: Int -> l a -> ModifiedLayout SpacingWithEdge l a
+spacingWithEdge p = ModifiedLayout (SpacingWithEdge p)
+
+data SpacingWithEdge a = SpacingWithEdge Int deriving (Show, Read)
+
+instance LayoutModifier SpacingWithEdge a where
+
+    pureModifier (SpacingWithEdge p) _ _ wrs = (map (second $ shrinkRect p) wrs, Nothing)
+
+    modifyLayout (SpacingWithEdge p) w r = runLayout w (shrinkRect p r)
+
+    modifierDescription (SpacingWithEdge p) = "SpacingWithEdge " ++ show p
+
 shrinkRect :: Int -> Rectangle -> Rectangle
 shrinkRect p (Rectangle x y w h) = Rectangle (x+fi p) (y+fi p) (w-2*fi p) (h-2*fi p)
 
@@ -67,3 +86,22 @@ instance LayoutModifier SmartSpacing a where
     pureModifier (SmartSpacing p) _ _ wrs = (map (second $ shrinkRect p) wrs, Nothing)
 
     modifierDescription (SmartSpacing p) = "SmartSpacing " ++ show p
+
+-- | Surrounds all windows with blank space, and adds the same amount of spacing
+-- around the edge of the screen, except when the window is the only visible
+-- window on the current workspace.
+smartSpacingWithEdge :: Int -> l a -> ModifiedLayout SmartSpacingWithEdge l a
+smartSpacingWithEdge p = ModifiedLayout (SmartSpacingWithEdge p)
+
+data SmartSpacingWithEdge a = SmartSpacingWithEdge Int deriving (Show, Read)
+
+instance LayoutModifier SmartSpacingWithEdge a where
+
+    pureModifier _ _ _ [x] = ([x], Nothing)
+    pureModifier (SmartSpacingWithEdge p) _ _ wrs = (map (second $ shrinkRect p) wrs, Nothing)
+
+    modifyLayout (SmartSpacingWithEdge p) w r
+        | maybe False (\s -> null (up s) && null (down s)) (stack w) = runLayout w r
+        | otherwise = runLayout w (shrinkRect p r)
+
+    modifierDescription (SmartSpacingWithEdge p) = "SmartSpacingWithEdge " ++ show p
-- 
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