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author | Pavan Rikhi <pavan.rikhi@gmail.com> | 2018-03-17 22:48:24 -0400 |
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committer | jao <jao@gnu.org> | 2018-11-21 21:41:35 +0000 |
commit | 4d1402a1a7d87767267d48a77998e4fb13395b31 (patch) | |
tree | 17fd6160dc1fa9c8a0676a94bcf8d19b551c655c /src/Plugins/MarqueePipeReader.hs | |
parent | 9e2a5c7daddf683d4be7c318aefed3da3ea7a89a (diff) | |
download | xmobar-4d1402a1a7d87767267d48a77998e4fb13395b31.tar.gz xmobar-4d1402a1a7d87767267d48a77998e4fb13395b31.tar.bz2 |
Split Modules into Library & Executable Structure
Move the Main module to a new `app` directory. All other modules have
been nested under the `Xmobar` name. Lots of module headers & imports
were updated.
Diffstat (limited to 'src/Plugins/MarqueePipeReader.hs')
-rw-r--r-- | src/Plugins/MarqueePipeReader.hs | 70 |
1 files changed, 0 insertions, 70 deletions
diff --git a/src/Plugins/MarqueePipeReader.hs b/src/Plugins/MarqueePipeReader.hs deleted file mode 100644 index c46fff4..0000000 --- a/src/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 Plugins.MarqueePipeReader where - -import System.IO (openFile, IOMode(ReadWriteMode), Handle) -import Environment -import 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 |