xmobar -> test own Modules 2

home/programs/xmonad/default.nix

@@ -12,5 +12,11 @@
     };
   };
 
-  home.packages = with pkgs; [ xmobar maim xdotool xorg.xmessage ];
+  home.packages = with pkgs; [
+    xmobar
+    maim
+    xdotool
+    xorg.xmessage
+    cabal-install
+  ];
 }

home/programs/xmonad/src/xmobar/Commands.hs

@@ -0,0 +1,85 @@
+-----------------------------------------------------------------------------
+-- |
+-- Module      :  Xmobar.Commands
+-- 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 Commands
+    ( Command (..)
+    , Exec    (..)
+    , tenthSeconds
+    ) where
+
+import Prelude
+import Control.Concurrent
+import Control.Exception (handle, SomeException(..))
+import Data.Char
+import System.Process
+import System.Exit
+import System.IO (hClose)
+
+import Signal
+import XUtil
+
+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
+
+data Command = Com Program Args Alias Rate
+               deriving (Show,Read,Eq)
+
+type Args    = [String]
+type Program = String
+type Alias   = String
+type Rate    = Int
+
+instance Exec Command where
+    alias (Com p    _    a _)
+        | p /= ""             = if a == "" then p else a
+        | otherwise           = ""
+    start (Com prog args _ r) cb = if r > 0 then go else exec
+        where go = exec >> tenthSeconds r >> go
+              exec = do
+                (i,o,e,p) <- runInteractiveCommand (unwords (prog:args))
+                exit <- waitForProcess p
+                let closeHandles = hClose o >> hClose i >> hClose e
+                    getL = handle (\(SomeException _) -> return "")
+                                  (hGetLineSafe o)
+                case exit of
+                  ExitSuccess -> do str <- getL
+                                    closeHandles
+                                    cb str
+                  _ -> do closeHandles
+                          cb $ "Could not execute command " ++ prog
+
+
+-- | 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

home/programs/xmonad/src/xmobar/Plugins/Audio.hs

@@ -16,7 +16,7 @@
 
 module Plugins.Audio where
 
---import Plugins
+import Plugins
 import System.Process
 import GHC.Show (Show(show))
 

home/programs/xmonad/src/xmobar/xmobar-custom.cabal

@@ -42,7 +42,10 @@ executable xmobar
     -- .hs or .lhs file containing the Main module.
     main-is:          xmobar.hs
 
-    other-modules:    Plugins.Audio
+    other-modules:    Commands,
+                      XUtil,
+                      Plugins,
+                      Plugins.Audio
     -- Other library packages from which modules are imported.
     build-depends:    base ^>=4.17.2.1,
                       xmobar ^>=0.47.1,