The app dir

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+{-# LANGUAGE FlexibleContexts #-}
+-----------------------------------------------------------------------------
+-- |
+-- Module      :  Xmobar.Main
+-- Copyright   :  (c) Andrea Rossato
+-- License     :  BSD-style (see LICENSE)
+--
+-- Maintainer  :  Jose A. Ortega Ruiz <jao@gnu.org>
+-- Stability   :  unstable
+-- Portability :  unportable
+--
+-- The main module of Xmobar, a text based status bar
+--
+-----------------------------------------------------------------------------
+
+module Main (main) where
+
+import Data.List (intercalate)
+
+import Data.Version (showVersion)
+import System.Console.GetOpt
+import System.Exit
+import System.Environment (getArgs)
+import Control.Monad (unless)
+import Text.Read (readMaybe)
+
+import Xmobar (xmobar)
+import Xmobar.Config
+
+import Paths_xmobar (version)
+import Configuration (readConfig, readDefaultConfig)
+
+-- $main
+
+-- | The main entry point
+main :: IO ()
+main = do
+  (o,file) <- getArgs >>= getOpts
+  (c,defaultings) <- case file of
+                       [cfgfile] -> readConfig cfgfile usage
+                       _ -> readDefaultConfig usage
+  unless (null defaultings) $ putStrLn $
+    "Fields missing from config defaulted: " ++ intercalate "," defaultings
+  doOpts c o >>= xmobar
+
+data Opts = Help
+          | Version
+          | Font       String
+          | BgColor    String
+          | FgColor    String
+          | Alpha      String
+          | T
+          | B
+          | D
+          | AlignSep   String
+          | Commands   String
+          | AddCommand String
+          | SepChar    String
+          | Template   String
+          | OnScr      String
+          | IconRoot   String
+          | Position   String
+          | WmClass    String
+          | WmName     String
+       deriving Show
+
+options :: [OptDescr Opts]
+options =
+    [ Option "h?" ["help"] (NoArg Help) "This help"
+    , Option "V" ["version"] (NoArg Version) "Show version information"
+    , Option "f" ["font"] (ReqArg Font "font name") "The font name"
+    , Option "w" ["wmclass"] (ReqArg WmClass "class") "X11 WM_CLASS property"
+    , Option "n" ["wmname"] (ReqArg WmName "name") "X11 WM_NAME property"
+    , Option "B" ["bgcolor"] (ReqArg BgColor "bg color" )
+      "The background color. Default black"
+    , Option "F" ["fgcolor"] (ReqArg FgColor "fg color")
+      "The foreground color. Default grey"
+    , Option "i" ["iconroot"] (ReqArg IconRoot "path")
+      "Root directory for icon pattern paths. Default '.'"
+    , Option "A" ["alpha"] (ReqArg Alpha "alpha")
+      "The transparency: 0 is transparent, 255 is opaque. Default: 255"
+    , Option "o" ["top"] (NoArg T) "Place xmobar at the top of the screen"
+    , Option "b" ["bottom"] (NoArg B)
+      "Place xmobar at the bottom of the screen"
+    , Option "d" ["dock"] (NoArg D)
+      "Don't override redirect from WM and function as a dock"
+    , Option "a" ["alignsep"] (ReqArg AlignSep "alignsep")
+      "Separators for left, center and right text\nalignment. Default: '}{'"
+    , Option "s" ["sepchar"] (ReqArg SepChar "char")
+      ("The character used to separate commands in" ++
+       "\nthe output template. Default '%'")
+    , Option "t" ["template"] (ReqArg Template "template")
+      "The output template"
+    , Option "c" ["commands"] (ReqArg Commands "commands")
+      "The list of commands to be executed"
+    , Option "C" ["add-command"] (ReqArg AddCommand "command")
+      "Add to the list of commands to be executed"
+    , Option "x" ["screen"] (ReqArg OnScr "screen")
+      "On which X screen number to start"
+    , Option "p" ["position"] (ReqArg Position "position")
+      "Specify position of xmobar. Same syntax as in config file"
+    ]
+
+getOpts :: [String] -> IO ([Opts], [String])
+getOpts argv =
+    case getOpt Permute options argv of
+      (o,n,[])   -> return (o,n)
+      (_,_,errs) -> error (concat errs ++ usage)
+
+usage :: String
+usage = usageInfo header options ++ footer
+    where header = "Usage: xmobar [OPTION...] [FILE]\nOptions:"
+          footer = "\nMail bug reports and suggestions to " ++ mail ++ "\n"
+
+info :: String
+info = "xmobar " ++ showVersion version
+        ++ "\n (C) 2007 - 2010 Andrea Rossato "
+        ++ "\n (C) 2010 - 2018 Jose A Ortega Ruiz\n "
+        ++ mail ++ "\n" ++ license
+
+mail :: String
+mail = "<mail@jao.io>"
+
+license :: String
+license = "\nThis program is distributed in the hope that it will be useful," ++
+          "\nbut WITHOUT ANY WARRANTY; without even the implied warranty of" ++
+          "\nMERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE." ++
+          "\nSee the License for more details."
+
+doOpts :: Config -> [Opts] -> IO Config
+doOpts conf [] =
+  return (conf {lowerOnStart = lowerOnStart conf && overrideRedirect conf})
+doOpts conf (o:oo) =
+  case o of
+    Help -> putStr   usage >> exitSuccess
+    Version -> putStrLn info  >> exitSuccess
+    Font s -> doOpts' (conf {font = s})
+    WmClass s -> doOpts' (conf {wmClass = s})
+    WmName s -> doOpts' (conf {wmName = s})
+    BgColor s -> doOpts' (conf {bgColor = s})
+    FgColor s -> doOpts' (conf {fgColor = s})
+    Alpha n -> doOpts' (conf {alpha = read n})
+    T -> doOpts' (conf {position = Top})
+    B -> doOpts' (conf {position = Bottom})
+    D -> doOpts' (conf {overrideRedirect = False})
+    AlignSep s -> doOpts' (conf {alignSep = s})
+    SepChar s -> doOpts' (conf {sepChar = s})
+    Template s -> doOpts' (conf {template = s})
+    IconRoot s -> doOpts' (conf {iconRoot = s})
+    OnScr n -> doOpts' (conf {position = OnScreen (read n) $ position conf})
+    Commands s -> case readCom 'c' s of
+                    Right x -> doOpts' (conf {commands = x})
+                    Left e -> putStr (e ++ usage) >> exitWith (ExitFailure 1)
+    AddCommand s -> case readCom 'C' s of
+                      Right x -> doOpts' (conf {commands = commands conf ++ x})
+                      Left e -> putStr (e ++ usage) >> exitWith (ExitFailure 1)
+    Position s -> readPosition s
+  where readCom c str =
+          case readStr str of
+            [x] -> Right x
+            _  -> Left ("xmobar: cannot read list of commands " ++
+                        "specified with the -" ++ c:" option\n")
+        readStr str = [x | (x,t) <- reads str, ("","") <- lex t]
+        doOpts' opts = doOpts opts oo
+        readPosition string =
+            case readMaybe string of
+                Just x  -> doOpts' (conf { position = x })
+                Nothing -> do
+                    putStrLn "Can't parse position option, ignoring"
+                    doOpts' conf