{- | Module : XMonad.Util.XSelection Copyright : (C) 2007 Andrea Rossato, Matthew Sackman License : BSD3 Maintainer : Andrea Rossato , Matthew Sackman Stability : unstable Portability : unportable A module for accessing and manipulating X Window's mouse selection (the buffer used in copy and pasting). 'getSelection' and 'putSelection' are adaptations of Hxsel.hs and Hxput.hs from the XMonad-utils, available: > $ darcs get -} module XMonad.Util.XSelection ( -- * Usage -- $usage getSelection, promptSelection, safePromptSelection, putSelection) where import Control.Concurrent (forkIO) import Control.Exception as E (catch) import Control.Monad(Monad (return, (>>)), Functor(..), liftM, join) import Data.Bits (shiftL, (.&.), (.|.)) import Data.Char (chr, ord) import Data.Maybe (fromMaybe) import Data.Word (Word8) import XMonad import XMonad.Util.Run (safeSpawn, unsafeSpawn) {- $usage Add @import XMonad.Util.XSelection@ to the top of Config.hs Then make use of getSelection or promptSelection as needed; if one wanted to run Firefox with the selection as an argument (perhaps the selection string is an URL you just highlighted), then one could add to the xmonad.hs a line like thus: > , ((modMask .|. shiftMask, xK_b), promptSelection "firefox") There are a number of known problems with XSelection: * Unicode handling is busted. But it's still better than calling 'chr' to translate to ASCII, at least. As near as I can tell, the mangling happens when the String is outputted somewhere, such as via promptSelection's passing through the shell, or GHCi printing to the terminal. utf-string has IO functions which can fix this, though I do not know have to use them here. It's a complex issue; see and . * Needs more elaborate functionality: Emacs' registers are nice; if you don't know what they are, see -} -- | Returns a String corresponding to the current mouse selection in X; if there is none, an empty string is returned. Note that this is -- really only reliable for ASCII text and currently escapes or otherwise mangles more complex UTF-8 characters. getSelection :: MonadIO m => m String getSelection = io $ do dpy <- openDisplay "" let dflt = defaultScreen dpy rootw <- rootWindow dpy dflt win <- createSimpleWindow dpy rootw 0 0 1 1 0 0 0 p <- internAtom dpy "PRIMARY" True ty <- E.catch (E.catch (internAtom dpy "UTF8_STRING" False) (\_ -> internAtom dpy "COMPOUND_TEXT" False)) (\_ -> internAtom dpy "sTring" False) clp <- internAtom dpy "BLITZ_SEL_STRING" False xConvertSelection dpy p ty clp win currentTime allocaXEvent $ \e -> do nextEvent dpy e ev <- getEvent e if ev_event_type ev == selectionNotify then do res <- getWindowProperty8 dpy clp win return $ decode . map fromIntegral . fromMaybe [] $ res else destroyWindow dpy win >> return "" -- | Set the current X Selection to a specified string. putSelection :: MonadIO m => String -> m () putSelection text = io $ do dpy <- openDisplay "" let dflt = defaultScreen dpy rootw <- rootWindow dpy dflt win <- createSimpleWindow dpy rootw 0 0 1 1 0 0 0 p <- internAtom dpy "PRIMARY" True ty <- internAtom dpy "UTF8_STRING" False xSetSelectionOwner dpy p win currentTime winOwn <- xGetSelectionOwner dpy p if winOwn == win then do forkIO ((allocaXEvent $ processEvent dpy ty text) >> destroyWindow dpy win) >> return () else do putStrLn "Unable to obtain ownership of the selection" >> destroyWindow dpy win return () where processEvent :: Display -> Atom -> [Char] -> XEventPtr -> IO () processEvent dpy ty txt e = do nextEvent dpy e ev <- getEvent e if ev_event_type ev == selectionRequest then do print ev allocaXEvent $ \replyPtr -> do changeProperty8 (ev_event_display ev) (ev_requestor ev) (ev_property ev) ty propModeReplace (map (fromIntegral . ord) txt) setSelectionNotify replyPtr (ev_requestor ev) (ev_selection ev) (ev_target ev) (ev_property ev) (ev_time ev) sendEvent dpy (ev_requestor ev) False noEventMask replyPtr sync dpy False else do putStrLn "Unexpected Message Received" print ev processEvent dpy ty text e {- | A wrapper around 'getSelection'. Makes it convenient to run a program with the current selection as an argument. This is convenient for handling URLs, in particular. For example, in your Config.hs you could bind a key to @promptSelection \"firefox\"@; this would allow you to highlight a URL string and then immediately open it up in Firefox. 'promptSelection' passes strings through the system shell, \/bin\/sh; if you do not wish your selected text to be interpreted or mangled by the shell, use 'safePromptSelection'. safePromptSelection will bypass the shell using 'safeSpawn' from "XMonad.Util.Run"; see its documentation for more details on the advantages and disadvantages of using safeSpawn. -} promptSelection, safePromptSelection, unsafePromptSelection :: String -> X () promptSelection = unsafePromptSelection safePromptSelection app = join $ io $ liftM (safeSpawn app) (getSelection) unsafePromptSelection app = join $ io $ liftM unsafeSpawn $ fmap (\x -> app ++ " " ++ x) getSelection {- | Decode a UTF8 string packed into a list of Word8 values, directly to String; does not deal with CChar, hence you will want the counter-intuitive @map fromIntegral@ UTF-8 decoding for internal use in getSelection. This code is copied from Eric Mertens's "utf-string" library (as of version 0.1),\which is BSD-3 licensed like this module. It'd be better to just @import Codec.Binary.UTF8.String (decode)@, but then users of this would need to install it; XMonad has enough dependencies already. -} decode :: [Word8] -> String decode [ ] = "" decode (c:cs) | c < 0x80 = chr (fromEnum c) : decode cs | c < 0xc0 = replacement_character : decode cs | c < 0xe0 = multi_byte 1 0x1f 0x80 | c < 0xf0 = multi_byte 2 0xf 0x800 | c < 0xf8 = multi_byte 3 0x7 0x10000 | c < 0xfc = multi_byte 4 0x3 0x200000 | c < 0xfe = multi_byte 5 0x1 0x4000000 | otherwise = replacement_character : decode cs where replacement_character :: Char replacement_character = '\xfffd' multi_byte :: Int -> Word8 -> Int -> [Char] multi_byte i mask overlong = aux i cs (fromEnum (c .&. mask)) where aux 0 rs acc | overlong <= acc && acc <= 0x10ffff && (acc < 0xd800 || 0xdfff < acc) && (acc < 0xfffe || 0xffff < acc) = chr acc : decode rs | otherwise = replacement_character : decode rs aux n (r:rs) acc | r .&. 0xc0 == 0x80 = aux (n-1) rs $ shiftL acc 6 .|. fromEnum (r .&. 0x3f) aux _ rs _ = replacement_character : decode rs