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|
-----------------------------------------------------------------------------
-- |
-- Module : Plugins.Kbd
-- Copyright : (c) Martin Perner
-- License : BSD-style (see LICENSE)
--
-- Maintainer : Martin Perner <martin@perner.cc>
-- Stability : unstable
-- Portability : unportable
--
-- A keyboard layout indicator for Xmobar
--
-----------------------------------------------------------------------------
module Xmobar.Plugins.Kbd(Kbd(..)) where
import Data.List (isPrefixOf)
import Data.Maybe (fromMaybe)
import Data.Char (toLower)
import Control.Monad (forever)
import Control.Applicative ((<|>))
import Graphics.X11.Xlib
import Graphics.X11.Xlib.Extras
import Xmobar.Run.Exec
import Xmobar.X11.Events (nextEvent')
import Xmobar.System.Kbd
-- 'Bad' prefixes of layouts
noLaySymbols :: [String]
noLaySymbols = ["group", "inet", "ctr", "compose", "pc", "ctrl", "terminate"]
-- splits the layout string into the actual layouts
splitLayout :: String -> [String]
splitLayout s
= filter flt
. map (takeWhile (/= ':'))
$ split (=='+') s
where
flt "" = False
flt s' = not $ any (`isPrefixOf` s') noLaySymbols
-- split String at each Char
split :: (Char -> Bool) -> String -> [String]
split p s = case break p s of
(pref, _:suf) -> pref : split p suf
(pref, "") -> [pref]
-- replaces input string if on search list (exact match) with corresponding
-- element on replacement list.
--
-- if not found, return string unchanged
searchReplaceLayout :: KbdOpts -> String -> String
searchReplaceLayout opts s = fromMaybe s $ lookup s opts
-- returns the active layout
getKbdLay :: Display -> KbdOpts -> IO String
getKbdLay dpy opts = do
lay <- splitLayout <$> getLayoutStr dpy
grps <- map (map toLower . take 2) <$> getGrpNames dpy
curLay <- getKbdLayout dpy
return $ searchReplaceLayout opts
$ fromMaybe "??"
$ (lay !!? curLay) <|> (grps !!? curLay)
(!!?) :: [a] -> Int -> Maybe a
(!!?) [] _ = Nothing
(!!?) (x : _) 0 = Just x
(!!?) (_ : xs) i = xs !!? (i - 1)
newtype Kbd = Kbd [(String, String)]
deriving (Read, Show)
instance Exec Kbd where
alias (Kbd _) = "kbd"
start (Kbd opts) cb = do
dpy <- openDisplay ""
-- initial set of layout
cb =<< getKbdLay dpy opts
-- enable listing for
-- group changes
_ <- xkbSelectEventDetails dpy xkbUseCoreKbd xkbStateNotify xkbAllStateComponentsMask xkbGroupStateMask
-- layout/geometry changes
_ <- xkbSelectEvents dpy xkbUseCoreKbd xkbNewKeyboardNotifyMask xkbNewKeyboardNotifyMask
allocaXEvent $ \e -> forever $ do
nextEvent' dpy e
_ <- getEvent e
cb =<< getKbdLay dpy opts
closeDisplay dpy
return ()
|
