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authorJose Antonio Ortega Ruiz <jao@gnu.org>2010-12-21 02:36:35 +0100
committerJose Antonio Ortega Ruiz <jao@gnu.org>2010-12-21 02:36:35 +0100
commite3853a9cb2a9a2cffa174d1334e2ca8ba610f151 (patch)
tree13aa04faea320afe85636e23686280386c1c2910 /src/Main.hs
parent598bfe5deeff079280e8513c55dc7bda3e8cf9a0 (diff)
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Haskell sources moved to src/ to unclutter toplevel
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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 Stuff
+ -- $main
+ main
+ , readConfig
+ , readDefaultConfig
+ ) where
+
+import Xmobar
+import Parsers
+import Config
+import XUtil
+
+import Data.List (intercalate)
+
+import Paths_xmobar (version)
+import Data.IORef
+import Data.Version (showVersion)
+import Graphics.X11.Xlib
+import System.Console.GetOpt
+import System.Exit
+import System.Environment
+import System.Posix.Files
+import Control.Monad (unless)
+
+-- $main
+
+-- | The main entry point
+main :: IO ()
+main = do
+ d <- openDisplay ""
+ args <- getArgs
+ (o,file) <- getOpts args
+ (c,defaultings) <- case file of
+ [cfgfile] -> readConfig cfgfile
+ _ -> readDefaultConfig
+
+ unless (null defaultings) $ putStrLn $ "Fields missing from config defaulted: "
+ ++ intercalate "," defaultings
+
+ -- listen for ConfigureEvents on the root window, for xrandr support:
+ rootw <- rootWindow d (defaultScreen d)
+ selectInput d rootw structureNotifyMask
+
+ civ <- newIORef c
+ doOpts civ o
+ conf <- readIORef civ
+ fs <- initFont d (font conf)
+ cl <- parseTemplate conf (template conf)
+ vars <- mapM startCommand cl
+ (r,w) <- createWin d fs conf
+ eventLoop (XConf d r w fs conf) vars
+
+-- | Reads the configuration files or quits with an error
+readConfig :: FilePath -> IO (Config,[String])
+readConfig f = do
+ file <- io $ fileExist f
+ s <- io $ if file then readFileSafe f else error $ f ++ ": file not found!\n" ++ usage
+ either (\err -> error $ f ++ ": configuration file contains errors at:\n" ++ show err)
+ return $ parseConfig s
+
+-- | Read default configuration file or load the default config
+readDefaultConfig :: IO (Config,[String])
+readDefaultConfig = do
+ home <- io $ getEnv "HOME"
+ let path = home ++ "/.xmobarrc"
+ f <- io $ fileExist path
+ if f then readConfig path else return (defaultConfig,[])
+
+data Opts = Help
+ | Version
+ | Font String
+ | BgColor String
+ | FgColor String
+ | T
+ | B
+ | AlignSep String
+ | Commands String
+ | SepChar String
+ | Template String
+ | OnScr 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 ['B' ] ["bgcolor" ] (ReqArg BgColor "bg color" ) "The background color. Default black"
+ , Option ['F' ] ["fgcolor" ] (ReqArg FgColor "fg color" ) "The foreground color. Default grey"
+ , 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 ['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 ['x' ] ["screen" ] (ReqArg OnScr "screen" ) "On which X screen number to start"
+ ]
+
+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 Jose A Ortega Ruiz\n "
+ ++ mail ++ "\n" ++ license
+
+mail :: String
+mail = "<xmobar@projects.haskell.org>"
+
+license :: String
+license = "\nThis program is distributed in the hope that it will be useful,\n" ++
+ "but WITHOUT ANY WARRANTY; without even the implied warranty of\n" ++
+ "MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n" ++
+ "See the License for more details."
+
+doOpts :: IORef Config -> [Opts] -> IO ()
+doOpts _ [] = return ()
+doOpts conf (o:oo) =
+ case o of
+ Help -> putStr usage >> exitWith ExitSuccess
+ Version -> putStrLn info >> exitWith ExitSuccess
+ Font s -> modifyIORef conf (\c -> c { font = s }) >> go
+ BgColor s -> modifyIORef conf (\c -> c { bgColor = s }) >> go
+ FgColor s -> modifyIORef conf (\c -> c { fgColor = s }) >> go
+ T -> modifyIORef conf (\c -> c { position = Top }) >> go
+ B -> modifyIORef conf (\c -> c { position = Bottom}) >> go
+ AlignSep s -> modifyIORef conf (\c -> c { alignSep = s }) >> go
+ SepChar s -> modifyIORef conf (\c -> c { sepChar = s }) >> go
+ Template s -> modifyIORef conf (\c -> c { template = s }) >> go
+ OnScr n -> modifyIORef conf (\c -> c { position = OnScreen (read n) $ position c }) >> go
+ Commands s -> case readCom s of
+ Right x -> modifyIORef conf (\c -> c { commands = x }) >> go
+ Left e -> putStr (e ++ usage) >> exitWith (ExitFailure 1)
+ where readCom 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]
+ go = doOpts conf oo