Fix: exposing the Command constructors in lib

1 files changed, 48 insertions, 0 deletions

diff --git a/src/Xmobar/Run/Exec.hs b/src/Xmobar/Run/Exec.hs
new file mode 100644
index 0000000..c8fcb9e
--- /dev/null
+++ b/src/Xmobar/Run/Exec.hs
@@ -0,0 +1,48 @@
+-----------------------------------------------------------------------------
+-- |
+-- Module      :  Xmobar.Exec
+-- Copyright   :  (c) Andrea Rossato
+-- License     :  BSD-style (see LICENSE)
+--
+-- Maintainer  :  Jose A. Ortega Ruiz <jao@gnu.org>
+-- Stability   :  unstable
+-- Portability :  unportable
+--
+-- The 'Exec' class and the 'Command' data type.
+--
+-- The 'Exec' class rappresents the executable types, whose constructors may
+-- appear in the 'Config.commands' field of the 'Config.Config' data type.
+--
+-- The 'Command' data type is for OS commands to be run by xmobar
+--
+-----------------------------------------------------------------------------
+
+module Xmobar.Run.Exec (Exec (..), tenthSeconds) where
+
+import Prelude
+import Data.Char
+import Control.Concurrent
+
+import Xmobar.System.Signal
+
+-- | Work around to the Int max bound: since threadDelay takes an Int, it
+-- is not possible to set a thread delay grater than about 45 minutes.
+-- With a little recursion we solve the problem.
+tenthSeconds :: Int -> IO ()
+tenthSeconds s | s >= x = do threadDelay (x * 100000)
+                             tenthSeconds (s - x)
+               | otherwise = threadDelay (s * 100000)
+               where x = (maxBound :: Int) `div` 100000
+
+class Show e => Exec e where
+    alias   :: e -> String
+    alias   e    = takeWhile (not . isSpace) $ show e
+    rate    :: e -> Int
+    rate    _    = 10
+    run     :: e -> IO String
+    run     _    = return ""
+    start   :: e -> (String -> IO ()) -> IO ()
+    start   e cb = go
+        where go = run e >>= cb >> tenthSeconds (rate e) >> go
+    trigger :: e -> (Maybe SignalType -> IO ()) -> IO ()
+    trigger _ sh  = sh Nothing