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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.Bifunctor (bimap)
import Data.List (find, tails, isPrefixOf)
import Data.Maybe (fromMaybe)
import Data.Char (toLower, isLetter)
import Data.Function ((&))
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
-- some strong typing
newtype Lay = Lay String deriving (Eq)
newtype Sym = Sym String
instance Show Sym where show (Sym s) = s
type KbdOpts' = [(Lay, Sym)]
typed :: [(String, String)] -> [(Lay, Sym)]
typed = map (bimap Lay Sym)
-- '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, and returns it paired with the following item
--
-- if not found, return string unchanged, paired with empty string
searchReplaceLayout :: KbdOpts' -> String -> (Lay, Lay, Sym)
searchReplaceLayout opts curr
= maybe (Lay "", Lay "", Sym curr)
pickSymWithAdjLays
(find currLayout (tails $ cycle opts))
where
pickSymWithAdjLays ((l1, _):(_, s):(l2, _):_) = (l1, l2, s)
pickSymWithAdjLays _ = error "This should never happen"
currLayout = (Lay curr ==) . (!! 1) . map fst
-- returns the active layout and the following one
getCurAndNextKbdLays :: Display -> KbdOpts' -> IO (Lay, Lay, Sym)
getCurAndNextKbdLays 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)
attachClickAction :: (Lay, Lay, Sym) -> Sym
attachClickAction (Lay prv, Lay nxt, txt) = txt & linkTo nxt `onKey` "1"
& linkTo prv `onKey` "3"
where
splitLayParensPhon :: String -> (String, String, String)
splitLayParensPhon = (\(a, (b, c)) -> (a, b, c))
. second (second (drop 1) . break (== ')') . drop 1)
. break (== '(')
parseLayPhon :: String -> (Maybe String, Maybe String)
parseLayPhon s = let (l, p, i) = splitLayParensPhon s
l' = if all isLetter l
then Just ("-layout " ++ l)
else Nothing
p' = if (p, i) == ("phonetic", "")
then Just "-variant phonetic"
else Nothing
in (l', p')
linkTo :: String -> String -> Sym -> Sym
linkTo linked button currLay = Sym $ case parseLayPhon linked of
(Nothing, _) -> "??"
(Just linkedLay, phon) -> wrapIn setxkbmap button currLay
where
setxkbmap = unwords ["setxkbmap", linkedLay, fromMaybe "" phon]
wrapIn :: String -> String -> Sym -> String
wrapIn action buttons (Sym sym) = openingTag ++ sym ++ closingTag
where
openingTag = "<action=`" ++ action ++ "` button=" ++ buttons ++ ">"
closingTag = "</action>"
onKey = ($)
second = fmap
instance Exec Kbd where
alias (Kbd _) = "kbd"
start (Kbd opts) cb = do
dpy <- openDisplay ""
-- initial set of layout
cb . show . attachClickAction =<< getCurAndNextKbdLays dpy (typed 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 . show . attachClickAction =<< getCurAndNextKbdLays dpy (typed opts)
closeDisplay dpy
|
