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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 System.Posix.Files (fileExist)
import Xmobar
import Paths_xmobar (version)
-- $main
-- | The main entry point
main :: IO ()
main = do
(o,file) <- getArgs >>= getOpts
(c,defaultings) <- case file of
[cfgfile] -> config cfgfile usage
_ -> defConfig usage
unless (null defaultings || (not $ any (== Debug) o)) $ putStrLn $
"Fields missing from config defaulted: " ++ intercalate "," defaultings
doOpts c o >>= xmobar
config :: FilePath -> String -> IO (Config,[String])
config f msg = do
let err m = error $ f ++ ": " ++ m
file <- fileExist f
r <- if file
then readConfig defaultConfig f
else err $ "file not found" ++ "\n" ++ msg
case r of
Left e -> err (show e)
Right res -> return res
-- | Read default configuration file or load the default config
defConfig :: String -> IO (Config,[String])
defConfig msg = do
xdgConfigFile <- xmobarConfigFile
xdgConfigFileExists <- fileExist xdgConfigFile
if xdgConfigFileExists
then config xdgConfigFile msg
else return (defaultConfig,[])
data Opts = Help
| Debug
| 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, Eq)
options :: [OptDescr Opts]
options =
[ Option "h?" ["help"] (NoArg Help) "This help"
, Option "D" ["debug"] (NoArg Debug) "Emit verbose debugging messages"
, Option "V" ["version"] (NoArg Version) "Show version information"
, Option "f" ["font"] (ReqArg Font "font name") "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")
"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")
("Character used to separate commands in" ++
"\nthe output template. Default '%'")
, Option "t" ["template"] (ReqArg Template "template")
"Output template"
, Option "c" ["commands"] (ReqArg Commands "commands")
"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
Debug -> doOpts' conf
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' c = doOpts c oo
readPosition string =
case readMaybe string of
Just x -> doOpts' (conf { position = x })
Nothing -> do
putStrLn "Can't parse position option, ignoring"
doOpts' conf
|
