1 files changed, 78 insertions, 0 deletions
diff --git a/src/Internal/XMobarLog.hs b/src/Internal/XMobarLog.hs
new file mode 100644
index 0000000..b36ba27
--- /dev/null
+++ b/src/Internal/XMobarLog.hs
@@ -0,0 +1,78 @@
+module Internal.XMobarLog ( XMobarLog, spawnXMobar, xMobarLogHook ) where
+
+import Control.Monad (forM_)
+import Control.Monad.Writer (tell, execWriter)
+import Data.List (sortBy)
+import Data.Maybe (mapMaybe)
+import Data.Ord (comparing)
+import Internal.LayoutDraw (showLayout)
+import System.IO (Handle, hSetEncoding, hPutStrLn, utf8)
+import XMonad.Util.NamedWindows (getName)
+import XMonad.Util.Run (spawnPipe)
+import XMonad (X)
+
+import qualified XMonad as X
+import qualified XMonad.StackSet as S
+
+data WorkspaceState = Current | Hidden | Visible
+
+data XMobarLog = XMobarLog Handle
+
+-- The log hook for XMobar. This is a custom log hook that does not use any
+-- of the Xmonad dynamic log libraries.
+
+spawnXMobar :: IO XMobarLog
+spawnXMobar = do
+  pipe <- spawnPipe "xmobar"
+  hSetEncoding pipe utf8
+  return (XMobarLog pipe)
+
+xMobarLogHook :: XMobarLog -> X ()
+xMobarLogHook (XMobarLog xmproc) = do
+  (_, _, layout) <- showLayout
+
+  winset <- X.gets X.windowset
+  title <- maybe (pure "") (fmap show . getName) . S.peek $ winset
+  let wss = getWorkspaces winset
+
+  X.liftIO $ do
+    hPutStrLn xmproc $ trunc 80 $ execWriter $ do
+      mapM_ tell layout
+      tell $ "<fc=#404040> │ </fc>"
+
+      forM_ wss $ \(t, name) -> do
+        case t of
+          Current -> tell "<fn=1><fc=#ff8888>"
+          Visible -> tell "<fn=6><fc=#8888ff>"
+          Hidden -> tell "<fn=2><fc=#888888>"
+        tell name
+        tell " </fc></fn>"
+
+      tell $ "<fc=#404040>│ </fc><fc=#a0a0a0><fn=3>"
+      tell $ title
+      tell $ "</fn></fc>"
+
+trunc :: Int -> String -> String
+trunc amt str = reverse $ trunc' False amt str []
+  where
+    trunc' _ _ [] acc = acc
+    trunc' ignore amt (a:as) acc =
+      case a of
+        '<' -> trunc' True amt as (a : acc)
+        '>' -> trunc' False amt as (a : acc)
+        _ ->
+          if ignore
+            then trunc' True amt as (a : acc)
+            else
+              case amt of
+                0 -> trunc' False 0 as acc
+                3 -> trunc' False 0 as ("..." ++ acc)
+                _ -> trunc' False (amt - 1) as (a : acc)
+
+getWorkspaces :: (Ord i) => S.StackSet i l a sid sd -> [(WorkspaceState, i)]
+getWorkspaces (S.StackSet (S.Screen cur _ _) vis hi _) =
+  sortBy (comparing snd) $
+    mapMaybe (\(a, S.Workspace t _ s) -> fmap (const (a, t)) s) $
+      map (\w -> (Hidden, w)) hi ++
+        map (\(S.Screen w _ _) -> (Visible, w)) vis ++
+          [(Current, cur)]