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Diffstat (limited to 'src/Xmobar/Plugins/MarqueePipeReader.hs')
-rw-r--r-- | src/Xmobar/Plugins/MarqueePipeReader.hs | 70 |
1 files changed, 0 insertions, 70 deletions
diff --git a/src/Xmobar/Plugins/MarqueePipeReader.hs b/src/Xmobar/Plugins/MarqueePipeReader.hs deleted file mode 100644 index ad6f27f..0000000 --- a/src/Xmobar/Plugins/MarqueePipeReader.hs +++ /dev/null @@ -1,70 +0,0 @@ ------------------------------------------------------------------------------ --- | --- Module : Plugins.MarqueePipeReader --- Copyright : (c) Reto Habluetzel --- License : BSD-style (see LICENSE) --- --- Maintainer : Jose A. Ortega Ruiz <jao@gnu.org> --- Stability : unstable --- Portability : unportable --- --- A plugin for reading from named pipes for long texts with marquee --- ------------------------------------------------------------------------------ - -module Xmobar.Plugins.MarqueePipeReader where - -import System.IO (openFile, IOMode(ReadWriteMode), Handle) -import Xmobar.Environment -import Xmobar.Plugins (tenthSeconds, Exec(alias, start), hGetLineSafe) -import System.Posix.Files (getFileStatus, isNamedPipe) -import Control.Concurrent(forkIO, threadDelay) -import Control.Concurrent.STM (TChan, atomically, writeTChan, tryReadTChan, newTChan) -import Control.Exception -import Control.Monad(forever, unless) -import Control.Applicative ((<$>)) - -type Length = Int -- length of the text to display -type Rate = Int -- delay in tenth seconds -type Separator = String -- if text wraps around, use separator - -data MarqueePipeReader = MarqueePipeReader String (Length, Rate, Separator) String - deriving (Read, Show) - -instance Exec MarqueePipeReader where - alias (MarqueePipeReader _ _ a) = a - start (MarqueePipeReader p (len, rate, sep) _) cb = do - (def, pipe) <- split ':' <$> expandEnv p - unless (null def) (cb def) - checkPipe pipe - h <- openFile pipe ReadWriteMode - line <- hGetLineSafe h - chan <- atomically newTChan - forkIO $ writer (toInfTxt line sep) sep len rate chan cb - forever $ pipeToChan h chan - where - split c xs | c `elem` xs = let (pre, post) = span (c /=) xs - in (pre, dropWhile (c ==) post) - | otherwise = ([], xs) - -pipeToChan :: Handle -> TChan String -> IO () -pipeToChan h chan = do - line <- hGetLineSafe h - atomically $ writeTChan chan line - -writer :: String -> Separator -> Length -> Rate -> TChan String -> (String -> IO ()) -> IO () -writer txt sep len rate chan cb = do - cb (take len txt) - mbnext <- atomically $ tryReadTChan chan - case mbnext of - Just new -> writer (toInfTxt new sep) sep len rate chan cb - Nothing -> tenthSeconds rate >> writer (drop 1 txt) sep len rate chan cb - -toInfTxt :: String -> String -> String -toInfTxt line sep = concat (repeat $ line ++ " " ++ sep ++ " ") - -checkPipe :: FilePath -> IO () -checkPipe file = handle (\(SomeException _) -> waitForPipe) $ do - status <- getFileStatus file - unless (isNamedPipe status) waitForPipe - where waitForPipe = threadDelay 1000 >> checkPipe file |