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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.Version (showVersion)
import Graphics.X11.Xlib
import System.Console.GetOpt
import System.Exit
import System.Environment
import System.Posix.Files
import Control.Monad (unless)
import Signal (setupSignalHandler, SignalType(..))
-- $main
-- | The main entry point
main :: IO ()
main = do
initThreads
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
conf <- doOpts c o
fs <- initFont d (font conf)
cls <- mapM (parseTemplate conf) (splitTemplate conf)
sig <- setupSignalHandler
vars <- mapM (mapM $ startCommand sig) cls
(r,w) <- createWin d fs conf
startLoop (XConf d r w fs conf) sig vars
-- | Splits the template in its parts
splitTemplate :: Config -> [String]
splitTemplate conf =
case break (==l) t of
(le,_:re) -> case break (==r) re of
(ce,_:ri) -> [le, ce, ri]
_ -> def
_ -> def
where [l, r] = if length (alignSep conf) == 2
then alignSep conf
else alignSep defaultConfig
t = template conf
def = [t, "", ""]
-- | 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
| AddCommand 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 ['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"
]
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 - 2011 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 :: Config -> [Opts] -> IO Config
doOpts conf [] = return conf
doOpts conf (o:oo) =
case o of
Help -> putStr usage >> exitWith ExitSuccess
Version -> putStrLn info >> exitWith ExitSuccess
Font s -> doOpts (conf {font = s }) oo
BgColor s -> doOpts (conf {bgColor = s }) oo
FgColor s -> doOpts (conf {fgColor = s }) oo
T -> doOpts (conf {position = Top }) oo
B -> doOpts (conf {position = Bottom}) oo
AlignSep s -> doOpts (conf {alignSep = s }) oo
SepChar s -> doOpts (conf {sepChar = s }) oo
Template s -> doOpts (conf {template = s }) oo
OnScr n -> doOpts (conf {position = OnScreen (read n) $ position conf}) oo
Commands s -> case readCom 'c' s of
Right x -> doOpts (conf { commands = x }) oo
Left e -> putStr (e ++ usage) >> exitWith (ExitFailure 1)
AddCommand s -> case readCom 'C' s of
Right x -> doOpts (conf { commands = commands conf ++ x }) oo
Left e -> putStr (e ++ usage) >> exitWith (ExitFailure 1)
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]
|
