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|
module Main where
import Graphics.X11.Xlib
import Graphics.X11.Xlib.Misc
import Graphics.X11.Xlib.Extras
import Text.ParserCombinators.Parsec
import Control.Concurrent
import Control.Monad
import Data.Bits
import System
data Config =
Config { fonts :: String
, bgColor :: String
, fgColor :: String
, xPos :: Int
, yPos :: Int
, width :: Int
, hight :: Int
} deriving (Eq, Show, Read, Ord)
defaultConfig :: Config
defaultConfig =
Config { fonts = "-misc-fixed-*-*-*-*-*-*-*-*-*-*-*-*"
, bgColor = "#000000"
, fgColor = "#ffffff"
, xPos = 0
, yPos = 0
, width = 1024
, hight = 15
}
main :: IO ()
main =
do args <- getArgs
config <-
if length args /= 1
then do putStrLn ("No configuration file specified. Using default settings.")
return defaultConfig
else readConfig (args!!0)
eventLoop config
eventLoop :: Config -> IO ()
eventLoop c =
do i <- getLine
ps <- stringParse c i
w <- createWin c
runWin c w ps
createWin :: Config -> IO (Display, Window)
createWin config =
do dpy <- openDisplay ""
let dflt = defaultScreen dpy
rootw <- rootWindow dpy dflt
win <- mkUnmanagedWindow dpy (defaultScreenOfDisplay dpy) rootw
(fromIntegral $ xPos config)
(fromIntegral $ yPos config)
(fromIntegral $ width config)
(fromIntegral $ hight config) 0
mapWindow dpy win
return (dpy,win)
runWin :: Config -> (Display, Window) -> [(String, String)] -> IO ()
runWin config (dpy, win) str = do
-- get default colors
bgcolor <- initColor dpy $ bgColor config
fgcolor <- initColor dpy $ fgColor config
-- window background
gc <- createGC dpy win
setForeground dpy gc bgcolor
fillRectangle dpy win gc 0 0
(fromIntegral $ width config)
(fromIntegral $ hight config)
-- let's get the fonts
fontst <- loadQueryFont dpy (fonts config)
setFont dpy gc (fontFromFontStruct fontst)
-- print what you need to print
let strWithLenth = map (\(s,c) -> (s,c,textWidth fontst s)) str
printStrings dpy win gc fontst 1 strWithLenth
-- refreesh, fre, resync... do what you gotta do
freeGC dpy gc
sync dpy True
-- back again: we are never ending
eventLoop config
{- $print
An easy way to print the stuff we need to print
-}
printStrings _ _ _ _ _ [] = return ()
printStrings dpy win gc fontst offset (x@(s,c,l):xs) =
do let (_,asc,desc,_) = textExtents fontst s
color <- initColor dpy c
setForeground dpy gc color
drawString dpy win gc offset asc s
printStrings dpy win gc fontst (offset + l) xs
{- $parser
This is suppose do be a parser. Don't trust him.
-}
stringParse :: Config -> String -> IO [(String, String)]
stringParse config s =
case (parse (stringParser config) "" s) of
Left err -> return [("Sorry, if I were a decent parser you now would be starring at something meaningful...",(fgColor config))]
Right x -> return x
stringParser :: Config -> Parser [(String, String)]
stringParser c = manyTill (choice [colorsAndText c,defaultColors c]) eof
defaultColors :: Config -> Parser (String, String)
defaultColors config =
do { s <- many $ noneOf "^"
; notFollowedBy (char '#')
; return (s,(fgColor config))
}
<|> colorsAndText config
colorsAndText :: Config -> Parser (String, String)
colorsAndText config =
do { string "^#"
; n <- count 6 hexDigit
; s <- many $ noneOf "^"
; notFollowedBy (char '#')
; return (s,"#"++n)
}
<|> defaultColors config
{- $unmanwin
This is a way to create unmamaged window. It was a mistery in haskell.
Till I've found out...;-)
-}
mkUnmanagedWindow :: Display
-> Screen
-> Window
-> Position
-> Position
-> Dimension
-> Dimension
-> Pixel
-> IO Window
mkUnmanagedWindow dpy scr rw x y w h bgcolor = do
let visual = defaultVisualOfScreen scr
attrmask = cWOverrideRedirect
window <- allocaSetWindowAttributes $
\attributes -> do
set_override_redirect attributes True
createWindow dpy rw x y w h 0 (defaultDepthOfScreen scr)
inputOutput visual attrmask attributes
return window
{- $utility
Utilitis, aka stollen without givin' credit stuff.
-}
readConfig :: FilePath -> IO Config
readConfig f =
do s <- readFile f
case reads s of
[(config, str)] -> return config
[] -> error ("corrupt config file: " ++ f)
-- | Get the Pixel value for a named color
initColor :: Display -> String -> IO Pixel
initColor dpy c = (color_pixel . fst) `liftM` allocNamedColor dpy colormap c
where colormap = defaultColormap dpy (defaultScreen dpy)
|
