-----------------------------------------------------------------------------
-- |
-- Module      :  XMonad.Util.DebugWindow
-- Description :  Dump window information for diagnostic\/debugging purposes.
-- Copyright   :  (c) Brandon S Allbery KF8NH, 2014
-- License     :  BSD3-style (see LICENSE)
--
-- Maintainer  :  allbery.b@gmail.com
-- Stability   :  unstable
-- Portability :  not portable
--
-- Module to dump window information for diagnostic/debugging purposes. See
-- "XMonad.Hooks.DebugEvents" and "XMonad.Hooks.DebugStack" for practical uses.
--
-----------------------------------------------------------------------------

module XMonad.Util.DebugWindow (debugWindow) where

import           Prelude

import           XMonad
import           XMonad.Prelude

import           Codec.Binary.UTF8.String        (decodeString)
import           Control.Exception                                     as E
import           Foreign.C.String
import           Numeric                         (showHex)
import           System.Exit

-- | Output a window by ID in hex, decimal, its ICCCM resource name and class,
--   and its title if available.  Also indicate override_redirect with an
--   exclamation mark, and wrap in brackets if it is unmapped or withdrawn.
debugWindow   :: Window -> X String
debugWindow :: Window -> X String
debugWindow Window
0 =  String -> X String
forall (m :: * -> *) a. Monad m => a -> m a
return String
"-no window-"
debugWindow Window
w =  do
  let wx :: String
wx = Int -> Char -> String -> String
pad Int
8 Char
'0' (String -> String) -> String -> String
forall a b. (a -> b) -> a -> b
$ Window -> String -> String
forall a. (Integral a, Show a) => a -> String -> String
showHex Window
w String
""
  Maybe WindowAttributes
w' <- Window -> X (Maybe WindowAttributes)
safeGetWindowAttributes Window
w
  case Maybe WindowAttributes
w' of
    Maybe WindowAttributes
Nothing                                   ->
      String -> X String
forall (m :: * -> *) a. Monad m => a -> m a
return (String -> X String) -> String -> X String
forall a b. (a -> b) -> a -> b
$ String
"(deleted window " String -> String -> String
forall a. [a] -> [a] -> [a]
++ String
wx String -> String -> String
forall a. [a] -> [a] -> [a]
++ String
")"
    Just WindowAttributes
      { wa_x :: WindowAttributes -> CInt
wa_x                 = CInt
x
      , wa_y :: WindowAttributes -> CInt
wa_y                 = CInt
y
      , wa_width :: WindowAttributes -> CInt
wa_width             = CInt
wid
      , wa_height :: WindowAttributes -> CInt
wa_height            = CInt
ht
      , wa_border_width :: WindowAttributes -> CInt
wa_border_width      = CInt
bw
      , wa_map_state :: WindowAttributes -> CInt
wa_map_state         = CInt
m
      , wa_override_redirect :: WindowAttributes -> Bool
wa_override_redirect = Bool
o
      } -> do
      Maybe [CChar]
c' <- (Display -> X (Maybe [CChar])) -> X (Maybe [CChar])
forall a. (Display -> X a) -> X a
withDisplay ((Display -> X (Maybe [CChar])) -> X (Maybe [CChar]))
-> (Display -> X (Maybe [CChar])) -> X (Maybe [CChar])
forall a b. (a -> b) -> a -> b
$ \Display
d ->
            IO (Maybe [CChar]) -> X (Maybe [CChar])
forall (m :: * -> *) a. MonadIO m => IO a -> m a
io (Display -> Window -> Window -> IO (Maybe [CChar])
getWindowProperty8 Display
d Window
wM_CLASS Window
w)
      let c :: String
c = case Maybe [CChar]
c' of
                Maybe [CChar]
Nothing -> String
""
                Just [CChar]
c''  -> String -> [String] -> String
forall a. [a] -> [[a]] -> [a]
intercalate String
"/" ([String] -> String) -> [String] -> String
forall a b. (a -> b) -> a -> b
$
                             ((String -> Maybe (String, String)) -> String -> [String])
-> String -> (String -> Maybe (String, String)) -> [String]
forall a b c. (a -> b -> c) -> b -> a -> c
flip (String -> Maybe (String, String)) -> String -> [String]
forall b a. (b -> Maybe (a, b)) -> b -> [a]
unfoldr ((CChar -> Char) -> [CChar] -> String
forall a b. (a -> b) -> [a] -> [b]
map (Int -> Char
forall a. Enum a => Int -> a
toEnum (Int -> Char) -> (CChar -> Int) -> CChar -> Char
forall b c a. (b -> c) -> (a -> b) -> a -> c
. CChar -> Int
forall a. Enum a => a -> Int
fromEnum) [CChar]
c'') ((String -> Maybe (String, String)) -> [String])
-> (String -> Maybe (String, String)) -> [String]
forall a b. (a -> b) -> a -> b
$
                             \String
s -> if String -> Bool
forall (t :: * -> *) a. Foldable t => t a -> Bool
null String
s
                                     then Maybe (String, String)
forall a. Maybe a
Nothing
                                     else let (String
w'',String
s'') = (Char -> Bool) -> String -> (String, String)
forall a. (a -> Bool) -> [a] -> ([a], [a])
break (Char -> Char -> Bool
forall a. Eq a => a -> a -> Bool
== Char
'\NUL') String
s
                                              s' :: String
s'      = if String -> Bool
forall (t :: * -> *) a. Foldable t => t a -> Bool
null String
s''
                                                          then String
s''
                                                          else String -> String
forall a. [a] -> [a]
tail String
s''
                                          in (String, String) -> Maybe (String, String)
forall a. a -> Maybe a
Just (String
w'',String
s')
      String
t <- X String -> X String -> X String
forall a. X a -> X a -> X a
catchX' (String -> String
wrap (String -> String) -> X String -> X String
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> String -> Window -> X String
getEWMHTitle  String
"VISIBLE" Window
w) (X String -> X String) -> X String -> X String
forall a b. (a -> b) -> a -> b
$
           X String -> X String -> X String
forall a. X a -> X a -> X a
catchX' (String -> String
wrap (String -> String) -> X String -> X String
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> String -> Window -> X String
getEWMHTitle  String
""        Window
w) (X String -> X String) -> X String -> X String
forall a b. (a -> b) -> a -> b
$
           X String -> X String -> X String
forall a. X a -> X a -> X a
catchX' (String -> String
wrap (String -> String) -> X String -> X String
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> Window -> X String
getICCCMTitle           Window
w) (X String -> X String) -> X String -> X String
forall a b. (a -> b) -> a -> b
$
           String -> X String
forall (m :: * -> *) a. Monad m => a -> m a
return String
""
      String
h' <- Window -> X String
getMachine Window
w
      let h :: String
h = if String -> Bool
forall (t :: * -> *) a. Foldable t => t a -> Bool
null String
h' then String
"" else Char
'@'Char -> String -> String
forall a. a -> [a] -> [a]
:String
h'
      -- if it has WM_COMMAND use it, else use the appName
      -- NB. modern stuff often does not set WM_COMMAND since it's only ICCCM required and not some
      -- horrible gnome/freedesktop session manager thing like Wayland intended. How helpful of them.
      [String]
p' <- (Display -> X [String]) -> X [String]
forall a. (Display -> X a) -> X a
withDisplay ((Display -> X [String]) -> X [String])
-> (Display -> X [String]) -> X [String]
forall a b. (a -> b) -> a -> b
$ \Display
d -> Display -> Window -> X [String]
safeGetCommand Display
d Window
w
      let p :: String
p = if [String] -> Bool
forall (t :: * -> *) a. Foldable t => t a -> Bool
null [String]
p' then String
"" else String -> String
wrap (String -> String) -> String -> String
forall a b. (a -> b) -> a -> b
$ [String] -> String
unwords [String]
p'
      Window
nWP <- String -> X Window
getAtom String
"_NET_WM_PID"
      Maybe [CLong]
pid' <- (Display -> X (Maybe [CLong])) -> X (Maybe [CLong])
forall a. (Display -> X a) -> X a
withDisplay ((Display -> X (Maybe [CLong])) -> X (Maybe [CLong]))
-> (Display -> X (Maybe [CLong])) -> X (Maybe [CLong])
forall a b. (a -> b) -> a -> b
$ \Display
d -> IO (Maybe [CLong]) -> X (Maybe [CLong])
forall (m :: * -> *) a. MonadIO m => IO a -> m a
io (IO (Maybe [CLong]) -> X (Maybe [CLong]))
-> IO (Maybe [CLong]) -> X (Maybe [CLong])
forall a b. (a -> b) -> a -> b
$ Display -> Window -> Window -> IO (Maybe [CLong])
getWindowProperty32 Display
d Window
nWP Window
w
      let pid :: String
pid = case Maybe [CLong]
pid' of
                  Just [CLong
pid''] -> Char
'('Char -> String -> String
forall a. a -> [a] -> [a]
:CLong -> String
forall a. Show a => a -> String
show CLong
pid'' String -> String -> String
forall a. [a] -> [a] -> [a]
++ String
")"
                  Maybe [CLong]
_            -> String
""
      let cmd :: String
cmd = String
p String -> String -> String
forall a. [a] -> [a] -> [a]
++ String
pid String -> String -> String
forall a. [a] -> [a] -> [a]
++ String
h
      let (String
lb,String
rb) = case () of
                      () | CInt
m CInt -> CInt -> Bool
forall a. Eq a => a -> a -> Bool
== CInt
waIsViewable -> (String
"",String
"")
                         | Bool
otherwise         -> (String
"[",String
"]")
          o' :: String
o'      = if Bool
o then String
"!" else String
""
      String -> X String
forall (m :: * -> *) a. Monad m => a -> m a
return (String -> X String) -> String -> X String
forall a b. (a -> b) -> a -> b
$ [String] -> String
forall (t :: * -> *) a. Foldable t => t [a] -> [a]
concat [String
lb
                      ,String
o'
                      ,String
wx
                      ,String
t
                      ,String
" "
                      ,CInt -> String
forall a. Show a => a -> String
show CInt
wid
                      ,Char
'x'Char -> String -> String
forall a. a -> [a] -> [a]
:CInt -> String
forall a. Show a => a -> String
show CInt
ht
                      ,if CInt
bw CInt -> CInt -> Bool
forall a. Eq a => a -> a -> Bool
== CInt
0 then String
"" else Char
'+'Char -> String -> String
forall a. a -> [a] -> [a]
:CInt -> String
forall a. Show a => a -> String
show CInt
bw
                      ,String
"@"
                      ,CInt -> String
forall a. Show a => a -> String
show CInt
x
                      ,Char
','Char -> String -> String
forall a. a -> [a] -> [a]
:CInt -> String
forall a. Show a => a -> String
show CInt
y
                      ,if String -> Bool
forall (t :: * -> *) a. Foldable t => t a -> Bool
null String
c then String
"" else Char
' 'Char -> String -> String
forall a. a -> [a] -> [a]
:String
c
                      ,if String -> Bool
forall (t :: * -> *) a. Foldable t => t a -> Bool
null String
cmd then String
"" else Char
' 'Char -> String -> String
forall a. a -> [a] -> [a]
:String
cmd
                      ,String
rb
                      ]

getEWMHTitle       :: String -> Window -> X String
getEWMHTitle :: String -> Window -> X String
getEWMHTitle String
sub Window
w =  do
  Window
a <- String -> X Window
getAtom (String -> X Window) -> String -> X Window
forall a b. (a -> b) -> a -> b
$ String
"_NET_WM_" String -> String -> String
forall a. [a] -> [a] -> [a]
++ (if String -> Bool
forall (t :: * -> *) a. Foldable t => t a -> Bool
null String
sub then String
"" else Char
'_'Char -> String -> String
forall a. a -> [a] -> [a]
:String
sub) String -> String -> String
forall a. [a] -> [a] -> [a]
++ String
"_NAME"
  (Just [CLong]
t) <- (Display -> X (Maybe [CLong])) -> X (Maybe [CLong])
forall a. (Display -> X a) -> X a
withDisplay ((Display -> X (Maybe [CLong])) -> X (Maybe [CLong]))
-> (Display -> X (Maybe [CLong])) -> X (Maybe [CLong])
forall a b. (a -> b) -> a -> b
$ \Display
d -> IO (Maybe [CLong]) -> X (Maybe [CLong])
forall (m :: * -> *) a. MonadIO m => IO a -> m a
io (IO (Maybe [CLong]) -> X (Maybe [CLong]))
-> IO (Maybe [CLong]) -> X (Maybe [CLong])
forall a b. (a -> b) -> a -> b
$ Display -> Window -> Window -> IO (Maybe [CLong])
getWindowProperty32 Display
d Window
a Window
w
  String -> X String
forall (m :: * -> *) a. Monad m => a -> m a
return (String -> X String) -> String -> X String
forall a b. (a -> b) -> a -> b
$ (CLong -> Char) -> [CLong] -> String
forall a b. (a -> b) -> [a] -> [b]
map (Int -> Char
forall a. Enum a => Int -> a
toEnum (Int -> Char) -> (CLong -> Int) -> CLong -> Char
forall b c a. (b -> c) -> (a -> b) -> a -> c
. CLong -> Int
forall a. Enum a => a -> Int
fromEnum) [CLong]
t

getICCCMTitle   :: Window -> X String
getICCCMTitle :: Window -> X String
getICCCMTitle Window
w =  Window -> Window -> X String
getDecodedStringProp Window
w Window
wM_NAME

getDecodedStringProp     :: Window -> Atom -> X String
getDecodedStringProp :: Window -> Window -> X String
getDecodedStringProp Window
w Window
a =  do
  t :: TextProperty
t@(TextProperty CString
t' Window
_ CInt
8 Window
_) <- (Display -> X TextProperty) -> X TextProperty
forall a. (Display -> X a) -> X a
withDisplay ((Display -> X TextProperty) -> X TextProperty)
-> (Display -> X TextProperty) -> X TextProperty
forall a b. (a -> b) -> a -> b
$ \Display
d -> IO TextProperty -> X TextProperty
forall (m :: * -> *) a. MonadIO m => IO a -> m a
io (IO TextProperty -> X TextProperty)
-> IO TextProperty -> X TextProperty
forall a b. (a -> b) -> a -> b
$ Display -> Window -> Window -> IO TextProperty
getTextProperty Display
d Window
w Window
a
  [String
s] <- X [String] -> X [String] -> X [String]
forall a. X a -> X a -> X a
catchX' (TextProperty -> X [String]
tryUTF8     TextProperty
t) (X [String] -> X [String]) -> X [String] -> X [String]
forall a b. (a -> b) -> a -> b
$
         X [String] -> X [String] -> X [String]
forall a. X a -> X a -> X a
catchX' (TextProperty -> X [String]
tryCompound TextProperty
t) (X [String] -> X [String]) -> X [String] -> X [String]
forall a b. (a -> b) -> a -> b
$
         IO [String] -> X [String]
forall (m :: * -> *) a. MonadIO m => IO a -> m a
io ((String -> [String] -> [String]
forall a. a -> [a] -> [a]
:[]) (String -> [String]) -> IO String -> IO [String]
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> CString -> IO String
peekCString CString
t')
  String -> X String
forall (m :: * -> *) a. Monad m => a -> m a
return String
s

tryUTF8                          :: TextProperty -> X [String]
tryUTF8 :: TextProperty -> X [String]
tryUTF8 (TextProperty CString
s Window
enc CInt
_ Window
_) =  do
  Window
uTF8_STRING <- String -> X Window
getAtom String
"UTF8_STRING"
  Bool -> X () -> X ()
forall (f :: * -> *). Applicative f => Bool -> f () -> f ()
when (Window
enc Window -> Window -> Bool
forall a. Eq a => a -> a -> Bool
/= Window
uTF8_STRING) (X () -> X ()) -> X () -> X ()
forall a b. (a -> b) -> a -> b
$ String -> X ()
forall a. HasCallStack => String -> a
error String
"String is not UTF8_STRING"
  (String -> String) -> [String] -> [String]
forall a b. (a -> b) -> [a] -> [b]
map String -> String
decodeString ([String] -> [String])
-> (String -> [String]) -> String -> [String]
forall b c a. (b -> c) -> (a -> b) -> a -> c
. String -> [String]
splitNul (String -> [String]) -> X String -> X [String]
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> IO String -> X String
forall (m :: * -> *) a. MonadIO m => IO a -> m a
io (CString -> IO String
peekCString CString
s)

tryCompound                            :: TextProperty -> X [String]
tryCompound :: TextProperty -> X [String]
tryCompound t :: TextProperty
t@(TextProperty CString
_ Window
enc CInt
_ Window
_) =  do
  Window
cOMPOUND_TEXT <- String -> X Window
getAtom String
"COMPOUND_TEXT"
  Bool -> X () -> X ()
forall (f :: * -> *). Applicative f => Bool -> f () -> f ()
when (Window
enc Window -> Window -> Bool
forall a. Eq a => a -> a -> Bool
/= Window
cOMPOUND_TEXT) (X () -> X ()) -> X () -> X ()
forall a b. (a -> b) -> a -> b
$ String -> X ()
forall a. HasCallStack => String -> a
error String
"String is not COMPOUND_TEXT"
  (Display -> X [String]) -> X [String]
forall a. (Display -> X a) -> X a
withDisplay ((Display -> X [String]) -> X [String])
-> (Display -> X [String]) -> X [String]
forall a b. (a -> b) -> a -> b
$ \Display
d -> IO [String] -> X [String]
forall (m :: * -> *) a. MonadIO m => IO a -> m a
io (IO [String] -> X [String]) -> IO [String] -> X [String]
forall a b. (a -> b) -> a -> b
$ Display -> TextProperty -> IO [String]
wcTextPropertyToTextList Display
d TextProperty
t

splitNul    :: String -> [String]
splitNul :: String -> [String]
splitNul String
"" =  []
splitNul String
s  =  let (String
s',String
ss') = (Char -> Bool) -> String -> (String, String)
forall a. (a -> Bool) -> [a] -> ([a], [a])
break (Char -> Char -> Bool
forall a. Eq a => a -> a -> Bool
== Char
'\NUL') String
s in String
s' String -> [String] -> [String]
forall a. a -> [a] -> [a]
: String -> [String]
splitNul String
ss'

pad       :: Int -> Char -> String -> String
pad :: Int -> Char -> String -> String
pad Int
w Char
c String
s =  Int -> Char -> String
forall a. Int -> a -> [a]
replicate (Int
w Int -> Int -> Int
forall a. Num a => a -> a -> a
- String -> Int
forall (t :: * -> *) a. Foldable t => t a -> Int
length String
s) Char
c String -> String -> String
forall a. [a] -> [a] -> [a]
++ String
s

-- modified 'catchX' without the print to 'stderr'
catchX' :: X a -> X a -> X a
catchX' :: X a -> X a -> X a
catchX' X a
job X a
errcase = do
  XState
st <- X XState
forall s (m :: * -> *). MonadState s m => m s
get
  XConf
c <- X XConf
forall r (m :: * -> *). MonadReader r m => m r
ask
  (a
a, XState
s') <- IO (a, XState) -> X (a, XState)
forall (m :: * -> *) a. MonadIO m => IO a -> m a
io (IO (a, XState) -> X (a, XState))
-> IO (a, XState) -> X (a, XState)
forall a b. (a -> b) -> a -> b
$ XConf -> XState -> X a -> IO (a, XState)
forall a. XConf -> XState -> X a -> IO (a, XState)
runX XConf
c XState
st X a
job IO (a, XState)
-> (SomeException -> IO (a, XState)) -> IO (a, XState)
forall e a. Exception e => IO a -> (e -> IO a) -> IO a
`E.catch` \SomeException
e -> case SomeException -> Maybe ExitCode
forall e. Exception e => SomeException -> Maybe e
fromException SomeException
e of
    Just ExitCode
x -> SomeException -> IO (a, XState)
forall a e. Exception e => e -> a
throw SomeException
e IO (a, XState) -> ExitCode -> IO (a, XState)
forall a b. a -> b -> a
`const` (ExitCode
x ExitCode -> ExitCode -> ExitCode
forall a. a -> a -> a
`asTypeOf` ExitCode
ExitSuccess)
    Maybe ExitCode
_      -> XConf -> XState -> X a -> IO (a, XState)
forall a. XConf -> XState -> X a -> IO (a, XState)
runX XConf
c XState
st X a
errcase
  XState -> X ()
forall s (m :: * -> *). MonadState s m => s -> m ()
put XState
s'
  a -> X a
forall (m :: * -> *) a. Monad m => a -> m a
return a
a

wrap   :: String -> String
wrap :: String -> String
wrap String
s =  Char
' ' Char -> String -> String
forall a. a -> [a] -> [a]
: Char
'"' Char -> String -> String
forall a. a -> [a] -> [a]
: String -> String
wrap' String
s String -> String -> String
forall a. [a] -> [a] -> [a]
++ String
"\""
  where
    wrap' :: String -> String
wrap' (Char
s':String
ss) | Char
s' Char -> Char -> Bool
forall a. Eq a => a -> a -> Bool
== Char
'"'  = Char
'\\' Char -> String -> String
forall a. a -> [a] -> [a]
: Char
s' Char -> String -> String
forall a. a -> [a] -> [a]
: String -> String
wrap' String
ss
                  | Char
s' Char -> Char -> Bool
forall a. Eq a => a -> a -> Bool
== Char
'\\' = Char
'\\' Char -> String -> String
forall a. a -> [a] -> [a]
: Char
s' Char -> String -> String
forall a. a -> [a] -> [a]
: String -> String
wrap' String
ss
                  | Bool
otherwise  =        Char
s' Char -> String -> String
forall a. a -> [a] -> [a]
: String -> String
wrap' String
ss
    wrap' String
""                   =             String
""

-- and so is getCommand
safeGetCommand     :: Display -> Window -> X [String]
safeGetCommand :: Display -> Window -> X [String]
safeGetCommand Display
d Window
w =  do
  Window
wC <- String -> X Window
getAtom String
"WM_COMMAND"
  Maybe [CChar]
p <- IO (Maybe [CChar]) -> X (Maybe [CChar])
forall (m :: * -> *) a. MonadIO m => IO a -> m a
io (IO (Maybe [CChar]) -> X (Maybe [CChar]))
-> IO (Maybe [CChar]) -> X (Maybe [CChar])
forall a b. (a -> b) -> a -> b
$ Display -> Window -> Window -> IO (Maybe [CChar])
getWindowProperty8 Display
d Window
wC Window
w
  case Maybe [CChar]
p of
    Maybe [CChar]
Nothing  -> [String] -> X [String]
forall (m :: * -> *) a. Monad m => a -> m a
return []
    Just [CChar]
cs' -> do
      let cs :: String
cs                    = (CChar -> Char) -> [CChar] -> String
forall a b. (a -> b) -> [a] -> [b]
map (Int -> Char
forall a. Enum a => Int -> a
toEnum (Int -> Char) -> (CChar -> Int) -> CChar -> Char
forall b c a. (b -> c) -> (a -> b) -> a -> c
. CChar -> Int
forall a. Enum a => a -> Int
fromEnum) [CChar]
cs'
          go :: ([String], (String, String)) -> ([String], (String, String))
go  ([String]
a,(String
s,String
"\NUL"))    = (String
sString -> [String] -> [String]
forall a. a -> [a] -> [a]
:[String]
a,(String
"",String
""))
          go  ([String]
a,(String
s,Char
'\NUL':String
ss)) = ([String], (String, String)) -> ([String], (String, String))
go (String
sString -> [String] -> [String]
forall a. a -> [a] -> [a]
:[String]
a,String -> (String, String)
go' String
ss)
          go  ([String], (String, String))
r                 = ([String], (String, String))
r -- ???
          go' :: String -> (String, String)
go'                   = (Char -> Bool) -> String -> (String, String)
forall a. (a -> Bool) -> [a] -> ([a], [a])
break (Char -> Char -> Bool
forall a. Eq a => a -> a -> Bool
== Char
'\NUL')
       in [String] -> X [String]
forall (m :: * -> *) a. Monad m => a -> m a
return ([String] -> X [String]) -> [String] -> X [String]
forall a b. (a -> b) -> a -> b
$ [String] -> [String]
forall a. [a] -> [a]
reverse ([String] -> [String]) -> [String] -> [String]
forall a b. (a -> b) -> a -> b
$ ([String], (String, String)) -> [String]
forall a b. (a, b) -> a
fst (([String], (String, String)) -> [String])
-> ([String], (String, String)) -> [String]
forall a b. (a -> b) -> a -> b
$ ([String], (String, String)) -> ([String], (String, String))
go ([],String -> (String, String)
go' String
cs)

getMachine   :: Window -> X String
getMachine :: Window -> X String
getMachine Window
w =  X String -> X String -> X String
forall a. X a -> X a -> X a
catchX' (String -> X Window
getAtom String
"WM_CLIENT_MACHINE" X Window -> (Window -> X String) -> X String
forall (m :: * -> *) a b. Monad m => m a -> (a -> m b) -> m b
>>= Window -> Window -> X String
getDecodedStringProp Window
w) (String -> X String
forall (m :: * -> *) a. Monad m => a -> m a
return String
"")