Refactoring: cleaner separation app/lib and more cleanups

1 files changed, 48 insertions, 341 deletions

diff --git a/src/lib/Xmobar.hs b/src/lib/Xmobar.hs
index 4172780..722ee72 100644
--- a/src/lib/Xmobar.hs
+++ b/src/lib/Xmobar.hs
@@ -1,4 +1,5 @@
 {-# LANGUAGE CPP #-}
+
 -----------------------------------------------------------------------------
 -- |
 -- Module      :  Xmobar
@@ -14,349 +15,55 @@
 --
 -----------------------------------------------------------------------------
 
-module Xmobar
-    ( -- * Main Stuff
-      -- $main
-      X , XConf (..), runX
-    , startLoop
-    -- * Program Execution
-    -- $command
-    , startCommand
-    -- * Window Management
-    -- $window
-    , createWin
-    -- * Printing
-    -- $print
-    , drawInWin, printStrings
-    ) where
-
-import Prelude hiding (lookup)
-import Graphics.X11.Xlib hiding (textExtents, textWidth)
-import Graphics.X11.Xlib.Extras
-import Graphics.X11.Xinerama
-import Graphics.X11.Xrandr
-
-import Control.Arrow ((&&&))
-import Control.Applicative ((<$>))
-import Control.Monad.Reader
-import Control.Concurrent
-import Control.Concurrent.Async (Async, async)
-import Control.Concurrent.STM
-import Control.Exception (handle, SomeException(..))
-import Data.Bits
-import Data.Map hiding (foldr, map, filter)
-import Data.Maybe (fromJust, isJust)
+module Xmobar (xmobar) where
 
-import Xmobar.Bitmap as Bitmap
+import Xmobar.EventLoop (startLoop, startCommand)
 import Xmobar.Config
-import Xmobar.Parsers
-import Xmobar.Commands
-import Xmobar.Actions
-import Xmobar.Runnable
-import Xmobar.Signal
-import Xmobar.Window
-import Xmobar.XUtil
-import Xmobar.ColorCache
-
-#ifdef XFT
-import Graphics.X11.Xft
-import Xmobar.MinXft (drawBackground)
-#endif
-
-#ifdef DBUS
-import Xmobar.IPC.DBus
-#endif
-
--- $main
---
--- The Xmobar data type and basic loops and functions.
-
--- | The X type is a ReaderT
-type X = ReaderT XConf IO
-
--- | The ReaderT inner component
-data XConf =
-    XConf { display   :: Display
-          , rect      :: Rectangle
-          , window    :: Window
-          , fontListS :: [XFont]
-          , verticalOffsets :: [Int]
-          , iconS     :: Map FilePath Bitmap
-          , config    :: Config
-          }
-
--- | Runs the ReaderT
-runX :: XConf -> X () -> IO ()
-runX xc f = runReaderT f xc
-
--- | Starts the main event loop and threads
-startLoop :: XConf -> TMVar SignalType -> [[([Async ()], TVar String)]]
-             -> IO ()
-startLoop xcfg@(XConf _ _ w _ _ _ _) sig vs = do
-#ifdef XFT
-    xftInitFtLibrary
-#endif
-    tv <- atomically $ newTVar []
-    _ <- forkIO (handle (handler "checker") (checker tv [] vs sig))
-#ifdef THREADED_RUNTIME
-    _ <- forkOS (handle (handler "eventer") (eventer sig))
-#else
-    _ <- forkIO (handle (handler "eventer") (eventer sig))
-#endif
-#ifdef DBUS
-    runIPC sig
-#endif
-    eventLoop tv xcfg [] sig
-  where
-    handler thing (SomeException e) =
-      void $ putStrLn ("Thread " ++ thing ++ " failed: " ++ show e)
-    -- Reacts on events from X
-    eventer signal =
-      allocaXEvent $ \e -> do
-        dpy <- openDisplay ""
-        xrrSelectInput dpy (defaultRootWindow dpy) rrScreenChangeNotifyMask
-        selectInput dpy w (exposureMask .|. structureNotifyMask .|. buttonPressMask)
-
-        forever $ do
-#ifdef THREADED_RUNTIME
-          nextEvent dpy e
-#else
-          nextEvent' dpy e
-#endif
-          ev <- getEvent e
-          case ev of
-            ConfigureEvent {} -> atomically $ putTMVar signal Reposition
-            ExposeEvent {} -> atomically $ putTMVar signal Wakeup
-            RRScreenChangeNotifyEvent {} -> atomically $ putTMVar signal Reposition
-            ButtonEvent {} -> atomically $ putTMVar signal (Action (ev_button ev) (fi $ ev_x ev))
-            _ -> return ()
-
--- | Send signal to eventLoop every time a var is updated
-checker :: TVar [String]
-           -> [String]
-           -> [[([Async ()], TVar String)]]
-           -> TMVar SignalType
-           -> IO ()
-checker tvar ov vs signal = do
-      nval <- atomically $ do
-              nv <- mapM concatV vs
-              guard (nv /= ov)
-              writeTVar tvar nv
-              return nv
-      atomically $ putTMVar signal Wakeup
-      checker tvar nval vs signal
-    where
-      concatV = fmap concat . mapM (readTVar . snd)
-
-
--- | Continuously wait for a signal from a thread or a interrupt handler
-eventLoop :: TVar [String]
-             -> XConf
-             -> [([Action], Position, Position)]
-             -> TMVar SignalType
-             -> IO ()
-eventLoop tv xc@(XConf d r w fs vos is cfg) as signal = do
-      typ <- atomically $ takeTMVar signal
-      case typ of
-         Wakeup -> do
-            str <- updateString cfg tv
-            xc' <- updateCache d w is (iconRoot cfg) str >>=
-                     \c -> return xc { iconS = c }
-            as' <- updateActions xc r str
-            runX xc' $ drawInWin r str
-            eventLoop tv xc' as' signal
-
-         Reposition ->
-            reposWindow cfg
-
-         ChangeScreen -> do
-            ncfg <- updateConfigPosition cfg
-            reposWindow ncfg
 
-         Hide   t -> hide   (t*100*1000)
-         Reveal t -> reveal (t*100*1000)
-         Toggle t -> toggle t
+import Data.Foldable (for_)
+import qualified Data.Map as Map
 
-         TogglePersistent -> eventLoop
-            tv xc { config = cfg { persistent = not $ persistent cfg } } as signal
+import Graphics.X11.Xlib
+import Control.Concurrent.Async (Async, cancel)
+import Control.Exception (bracket)
 
-         Action but x -> action but x
-
-    where
-        isPersistent = not $ persistent cfg
-
-        hide t
-            | t == 0 =
-                when isPersistent (hideWindow d w) >> eventLoop tv xc as signal
-            | otherwise = do
-                void $ forkIO
-                     $ threadDelay t >> atomically (putTMVar signal $ Hide 0)
-                eventLoop tv xc as signal
-
-        reveal t
-            | t == 0 = do
-                when isPersistent (showWindow r cfg d w)
-                eventLoop tv xc as signal
-            | otherwise = do
-                void $ forkIO
-                     $ threadDelay t >> atomically (putTMVar signal $ Reveal 0)
-                eventLoop tv xc as signal
-
-        toggle t = do
-            ismapped <- isMapped d w
-            atomically (putTMVar signal $ if ismapped then Hide t else Reveal t)
-            eventLoop tv xc as signal
-
-        reposWindow rcfg = do
-          r' <- repositionWin d w (head fs) rcfg
-          eventLoop tv (XConf d r' w fs vos is rcfg) as signal
-
-        updateConfigPosition ocfg =
-          case position ocfg of
-            OnScreen n o -> do
-              srs <- getScreenInfo d
-              return (if n == length srs
-                       then
-                        (ocfg {position = OnScreen 1 o})
-                       else
-                        (ocfg {position = OnScreen (n+1) o}))
-            o -> return (ocfg {position = OnScreen 1 o})
-
-        action button x = do
-          mapM_ runAction $
-            filter (\(Spawn b _) -> button `elem` b) $
-            concatMap (\(a,_,_) -> a) $
-            filter (\(_, from, to) -> x >= from && x <= to) as
-          eventLoop tv xc as signal
-
--- $command
-
--- | Runs a command as an independent thread and returns its Async handles
--- and the TVar the command will be writing to.
-startCommand :: TMVar SignalType
-             -> (Runnable,String,String)
-             -> IO ([Async ()], TVar String)
-startCommand sig (com,s,ss)
-    | alias com == "" = do var <- atomically $ newTVar is
-                           atomically $ writeTVar var (s ++ ss)
-                           return ([], var)
-    | otherwise = do var <- atomically $ newTVar is
-                     let cb str = atomically $ writeTVar var (s ++ str ++ ss)
-                     a1 <- async $ start com cb
-                     a2 <- async $ trigger com $ maybe (return ())
-                                                 (atomically . putTMVar sig)
-                     return ([a1, a2], var)
-    where is = s ++ "Updating..." ++ ss
-
-updateString :: Config -> TVar [String]
-                -> IO [[(Widget, String, Int, Maybe [Action])]]
-updateString conf v = do
-  s <- readTVarIO v
-  let l:c:r:_ = s ++ repeat ""
-  liftIO $ mapM (parseString conf) [l, c, r]
-
-updateActions :: XConf -> Rectangle -> [[(Widget, String, Int, Maybe [Action])]]
-                 -> IO [([Action], Position, Position)]
-updateActions conf (Rectangle _ _ wid _) ~[left,center,right] = do
-  let (d,fs) = (display &&& fontListS) conf
-      strLn :: [(Widget, String, Int, Maybe [Action])] -> IO [(Maybe [Action], Position, Position)]
-      strLn  = liftIO . mapM getCoords
-      iconW i = maybe 0 Bitmap.width (lookup i $ iconS conf)
-      getCoords (Text s,_,i,a) = textWidth d (fs!!i) s >>= \tw -> return (a, 0, fi tw)
-      getCoords (Icon s,_,_,a) = return (a, 0, fi $ iconW s)
-      partCoord off xs = map (\(a, x, x') -> (fromJust a, x, x')) $
-                         filter (\(a, _,_) -> isJust a) $
-                         scanl (\(_,_,x') (a,_,w') -> (a, x', x' + w'))
-                               (Nothing, 0, off)
-                               xs
-      totSLen = foldr (\(_,_,len) -> (+) len) 0
-      remWidth xs = fi wid - totSLen xs
-      offs = 1
-      offset a xs = case a of
-                     C -> (remWidth xs + offs) `div` 2
-                     R -> remWidth xs
-                     L -> offs
-  fmap concat $ mapM (\(a,xs) ->
-                       (\xs' -> partCoord (offset a xs') xs') <$> strLn xs) $
-                     zip [L,C,R] [left,center,right]
-
--- $print
-
--- | Draws in and updates the window
-drawInWin :: Rectangle -> [[(Widget, String, Int, Maybe [Action])]] -> X ()
-drawInWin wr@(Rectangle _ _ wid ht) ~[left,center,right] = do
-  r <- ask
-  let (c,d) = (config &&& display) r
-      (w,(fs,vs)) = (window &&& fontListS &&& verticalOffsets) r
-      strLn = liftIO . mapM getWidth
-      iconW i = maybe 0 Bitmap.width (lookup i $ iconS r)
-      getWidth (Text s,cl,i,_) =
-        textWidth d (fs!!i) s >>= \tw -> return (Text s,cl,i,fi tw)
-      getWidth (Icon s,cl,i,_) = return (Icon s,cl,i,fi $ iconW s)
-
-  p <- liftIO $ createPixmap d w wid ht
-                         (defaultDepthOfScreen (defaultScreenOfDisplay d))
-#if XFT
-  when (alpha c /= 255) (liftIO $ drawBackground d p (bgColor c) (alpha c) wr)
-#endif
-  withColors d [bgColor c, borderColor c] $ \[bgcolor, bdcolor] -> do
-    gc <- liftIO $ createGC  d w
-#if XFT
-    when (alpha c == 255) $ do
-#else
-    do
-#endif
-      liftIO $ setForeground d gc bgcolor
-      liftIO $ fillRectangle d p gc 0 0 wid ht
-    -- write to the pixmap the new string
-    printStrings p gc fs vs 1 L =<< strLn left
-    printStrings p gc fs vs 1 R =<< strLn right
-    printStrings p gc fs vs 1 C =<< strLn center
-    -- draw border if requested
-    liftIO $ drawBorder (border c) (borderWidth c) d p gc bdcolor wid ht
-    -- copy the pixmap with the new string to the window
-    liftIO $ copyArea d p w gc 0 0 wid ht 0 0
-    -- free up everything (we do not want to leak memory!)
-    liftIO $ freeGC d gc
-    liftIO $ freePixmap d p
-    -- resync
-    liftIO $ sync d True
-
-verticalOffset :: (Integral b, Integral a, MonadIO m) =>
-                  a -> Widget -> XFont -> Int -> Config -> m b
-verticalOffset ht (Text t) fontst voffs _
-  | voffs > -1 = return $ fi voffs
-  | otherwise = do
-     (as,ds) <- liftIO $ textExtents fontst t
-     let margin = (fi ht - fi ds - fi as) `div` 2
-     return $ fi as + margin - 1
-verticalOffset ht (Icon _) _ _ conf
-  | iconOffset conf > -1 = return $ fi (iconOffset conf)
-  | otherwise = return $ fi (ht `div` 2) - 1
-
--- | An easy way to print the stuff we need to print
-printStrings :: Drawable -> GC -> [XFont] -> [Int] -> Position
-             -> Align -> [(Widget, String, Int, Position)] -> X ()
-printStrings _ _ _ _ _ _ [] = return ()
-printStrings dr gc fontlist voffs offs a sl@((s,c,i,l):xs) = do
-  r <- ask
-  let (conf,d) = (config &&& display) r
-      alph = alpha conf
-      Rectangle _ _ wid ht = rect r
-      totSLen = foldr (\(_,_,_,len) -> (+) len) 0 sl
-      remWidth = fi wid - fi totSLen
-      fontst = fontlist !! i
-      offset = case a of
-                 C -> (remWidth + offs) `div` 2
-                 R -> remWidth
-                 L -> offs
-      (fc,bc) = case break (==',') c of
-                 (f,',':b) -> (f, b           )
-                 (f,    _) -> (f, bgColor conf)
-  valign <- verticalOffset ht s (head fontlist) (voffs !! i) conf
-  case s of
-    (Text t) -> liftIO $ printString d dr fontst gc fc bc offset valign t alph
-    (Icon p) -> liftIO $ maybe (return ())
-                           (drawBitmap d dr gc fc bc offset valign)
-                           (lookup p (iconS r))
-  printStrings dr gc fontlist voffs (offs + l) a xs
+import Xmobar.Parsers
+import Xmobar.XUtil
+import Xmobar.Config()
+import Xmobar.Signal (setupSignalHandler, withDeferSignals)
+import Xmobar.Window
+import Xmobar.Types
+
+splitTemplate :: Config -> [String]
+splitTemplate conf =
+  case break (==l) t of
+    (le,_:re) -> case break (==r) re of
+                   (ce,_:ri) -> [le, ce, ri]
+                   _         -> def
+    _         -> def
+  where [l, r] = alignSep
+                   (if length (alignSep conf) == 2 then conf else defaultConfig)
+        t = template conf
+        def = [t, "", ""]
+
+xmobar :: Config -> IO ()
+xmobar conf = withDeferSignals $ do
+  initThreads
+  d <- openDisplay ""
+  fs    <- initFont d (font conf)
+  fl    <- mapM (initFont d) (additionalFonts conf)
+  cls   <- mapM (parseTemplate conf) (splitTemplate conf)
+  sig   <- setupSignalHandler
+  bracket (mapM (mapM $ startCommand sig) cls)
+          cleanupThreads
+          $ \vars -> do
+    (r,w) <- createWin d fs conf
+    let ic = Map.empty
+        to = textOffset conf
+        ts = textOffsets conf ++ replicate (length fl) (-1)
+    startLoop (XConf d r w (fs:fl) (to:ts) ic conf) sig vars
+
+cleanupThreads :: [[([Async ()], a)]] -> IO ()
+cleanupThreads vars =
+  for_ (concat vars) $ \(asyncs, _) ->
+    for_ asyncs cancel