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|
{-# LANGUAGE ScopedTypeVariables, ForeignFunctionInterface, MultiParamTypeClasses, DeriveDataTypeable, FlexibleInstances, PatternGuards #-}
-----------------------------------------------------------------------------
-- |
-- 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.System.Kbd where
import Foreign
import Foreign.C.Types
import Foreign.C.String
import Graphics.X11.Xlib
#include <X11/XKBlib.h>
#include <X11/extensions/XKB.h>
#include <X11/extensions/XKBstr.h>
--
-- Definition for XkbStaceRec and getKbdLayout taken from
-- XMonad.Layout.XKBLayout
--
data XkbStateRec = XkbStateRec {
group :: CUChar,
locked_group :: CUChar,
base_group :: CUShort,
latched_group :: CUShort,
mods :: CUChar,
base_mods :: CUChar,
latched_mods :: CUChar,
locked_mods :: CUChar,
compat_state :: CUChar,
grab_mods :: CUChar,
compat_grab_mods :: CUChar,
lookup_mods :: CUChar,
compat_lookup_mods :: CUChar,
ptr_buttons :: CUShort
}
instance Storable XkbStateRec where
sizeOf _ = (#size XkbStateRec)
alignment _ = alignment (undefined :: CUShort)
poke _ _ = undefined
peek ptr = do
r_group <- (#peek XkbStateRec, group) ptr
r_locked_group <- (#peek XkbStateRec, locked_group) ptr
r_base_group <- (#peek XkbStateRec, base_group) ptr
r_latched_group <- (#peek XkbStateRec, latched_group) ptr
r_mods <- (#peek XkbStateRec, mods) ptr
r_base_mods <- (#peek XkbStateRec, base_mods) ptr
r_latched_mods <- (#peek XkbStateRec, latched_mods) ptr
r_locked_mods <- (#peek XkbStateRec, locked_mods) ptr
r_compat_state <- (#peek XkbStateRec, compat_state) ptr
r_grab_mods <- (#peek XkbStateRec, grab_mods) ptr
r_compat_grab_mods <- (#peek XkbStateRec, compat_grab_mods) ptr
r_lookup_mods <- (#peek XkbStateRec, lookup_mods) ptr
r_compat_lookup_mods <- (#peek XkbStateRec, compat_lookup_mods) ptr
r_ptr_buttons <- (#peek XkbStateRec, ptr_buttons) ptr
return XkbStateRec {
group = r_group,
locked_group = r_locked_group,
base_group = r_base_group,
latched_group = r_latched_group,
mods = r_mods,
base_mods = r_base_mods,
latched_mods = r_latched_mods,
locked_mods = r_locked_mods,
compat_state = r_compat_state,
grab_mods = r_grab_mods,
compat_grab_mods = r_compat_grab_mods,
lookup_mods = r_lookup_mods,
compat_lookup_mods = r_compat_lookup_mods,
ptr_buttons = r_ptr_buttons
}
foreign import ccall unsafe "X11/XKBlib.h XkbGetState"
xkbGetState :: Display -> CUInt -> Ptr XkbStateRec -> IO CInt
getKbdLayout :: Display -> IO Int
getKbdLayout d = alloca $ \stRecPtr -> do
xkbGetState d 0x100 stRecPtr
st <- peek stRecPtr
return $ fromIntegral (group st)
data XkbKeyNameRec = XkbKeyNameRec {
name :: Ptr CChar -- array
}
--
-- the t_ before alias is just because of name collisions
--
data XkbKeyAliasRec = XkbKeyAliasRec {
real :: Ptr CChar, -- array
t_alias :: Ptr CChar -- array
}
--
-- the t_ before geometry is just because of name collisions
--
data XkbNamesRec = XkbNamesRec {
keycodes :: Atom,
t_geometry :: Atom,
symbols :: Atom,
types :: Atom,
compat :: Atom,
vmods :: [Atom], -- Atom vmods[XkbNumVirtualMods];
indicators :: [Atom], -- Atom indicators[XkbNumIndicators];
groups :: [Atom], -- Atom groups[XkbNumKbdGroups];
keys :: Ptr XkbKeyNameRec,
key_aliases :: Ptr CChar, -- dont care XkbKeyAliasRec,
radio_groups :: Ptr Atom,
phys_symbols :: Atom,
num_keys :: CUChar,
num_key_aliases :: CUChar,
num_rg :: CUShort
}
--
-- the t_ before map, indicators and compat are just because of name collisions
--
data XkbDescRec = XkbDescRec {
t_dpy :: Ptr CChar, -- struct _XDisplay* ; don't care
flags :: CUShort,
device_spec :: CUShort,
min_key_code :: KeyCode,
max_key_code :: KeyCode,
ctrls :: Ptr CChar, -- XkbControlsPtr ; dont' care
server :: Ptr CChar, -- XkbServerMapPtr ; dont' care
t_map :: Ptr CChar, --XkbClientMapPtr ; dont' care
t_indicators :: Ptr CChar, -- XkbIndicatorPtr ; dont' care
names :: Ptr XkbNamesRec, -- array
t_compat :: Ptr CChar, -- XkbCompatMap ; dont' care
geom :: Ptr CChar -- XkbGeometryPtr ; dont' care
}
instance Storable XkbKeyNameRec where
sizeOf _ = (#size XkbKeyNameRec)
alignment _ = alignment (undefined :: CUShort)
poke _ _ = undefined
peek ptr = do
r_name <- (#peek XkbKeyNameRec, name) ptr
return XkbKeyNameRec {
name = r_name
}
instance Storable XkbKeyAliasRec where
sizeOf _ = (#size XkbKeyAliasRec)
alignment _ = alignment (undefined :: CUShort)
poke _ _ = undefined
peek ptr = do
r_real <- (#peek XkbKeyAliasRec, real) ptr
r_alias <- (#peek XkbKeyAliasRec, alias) ptr
return XkbKeyAliasRec {
real = r_real,
t_alias = r_alias
}
instance Storable XkbNamesRec where
sizeOf _ = (#size XkbNamesRec)
alignment _ = alignment (undefined :: CUShort)
poke _ _ = undefined
peek ptr = do
r_keycodes <- (#peek XkbNamesRec, keycodes) ptr
r_geometry <- (#peek XkbNamesRec, geometry) ptr
r_symbols <- (#peek XkbNamesRec, symbols ) ptr
r_types <- (#peek XkbNamesRec, types ) ptr
r_compat <- (#peek XkbNamesRec, compat ) ptr
r_vmods <- peekArray (#const XkbNumVirtualMods) $ (#ptr XkbNamesRec, vmods ) ptr
r_indicators <- peekArray (#const XkbNumIndicators) $ (#ptr XkbNamesRec, indicators ) ptr
r_groups <- peekArray (#const XkbNumKbdGroups) $ (#ptr XkbNamesRec, groups ) ptr
r_keys <- (#peek XkbNamesRec, keys ) ptr
r_key_aliases <- (#peek XkbNamesRec, key_aliases ) ptr
r_radio_groups <- (#peek XkbNamesRec, radio_groups ) ptr
r_phys_symbols <- (#peek XkbNamesRec, phys_symbols ) ptr
r_num_keys <- (#peek XkbNamesRec,num_keys ) ptr
r_num_key_aliases <- (#peek XkbNamesRec, num_key_aliases ) ptr
r_num_rg <- (#peek XkbNamesRec, num_rg ) ptr
return XkbNamesRec {
keycodes = r_keycodes,
t_geometry = r_geometry,
symbols = r_symbols,
types = r_types,
compat = r_compat,
vmods = r_vmods,
indicators = r_indicators,
groups = r_groups,
keys = r_keys,
key_aliases = r_key_aliases,
radio_groups = r_radio_groups,
phys_symbols = r_phys_symbols,
num_keys = r_num_keys,
num_key_aliases = r_num_key_aliases,
num_rg = r_num_rg
}
instance Storable XkbDescRec where
sizeOf _ = (#size XkbDescRec)
alignment _ = alignment (undefined :: CUShort)
poke _ _ = undefined
peek ptr = do
r_dpy <- (#peek XkbDescRec, dpy) ptr
r_flags <- (#peek XkbDescRec, flags) ptr
r_device_spec <- (#peek XkbDescRec, device_spec) ptr
r_min_key_code <- (#peek XkbDescRec, min_key_code) ptr
r_max_key_code <- (#peek XkbDescRec, max_key_code) ptr
r_ctrls <- (#peek XkbDescRec, ctrls) ptr
r_server <- (#peek XkbDescRec, server) ptr
r_map <- (#peek XkbDescRec, map) ptr
r_indicators <- (#peek XkbDescRec, indicators) ptr
r_names <- (#peek XkbDescRec, names) ptr
r_compat <- (#peek XkbDescRec, compat) ptr
r_geom <- (#peek XkbDescRec, geom) ptr
return XkbDescRec {
t_dpy = r_dpy,
flags = r_flags,
device_spec = r_device_spec,
min_key_code = r_min_key_code,
max_key_code = r_max_key_code,
ctrls = r_ctrls,
server = r_server,
t_map = r_map,
t_indicators = r_indicators,
names = r_names,
t_compat = r_compat,
geom = r_geom
}
--
-- C bindings
--
foreign import ccall unsafe "X11/XKBlib.h XkbAllocKeyboard"
xkbAllocKeyboard :: IO (Ptr XkbDescRec)
foreign import ccall unsafe "X11/XKBlib.h XkbGetNames"
xkbGetNames :: Display -> CUInt -> (Ptr XkbDescRec) -> IO Status
foreign import ccall unsafe "X11/XKBlib.h XGetAtomName"
xGetAtomName :: Display -> Atom -> IO CString
foreign import ccall unsafe "X11/XKBlib.h XkbFreeNames"
xkbFreeNames :: (Ptr XkbDescRec) -> CUInt -> CInt -> IO ()
foreign import ccall unsafe "X11/XKBlib.h XkbFreeKeyboard"
xkbFreeKeyboard :: (Ptr XkbDescRec) -> CUInt -> CInt -> IO ()
foreign import ccall unsafe "X11/XKBlib.h XkbSelectEventDetails"
xkbSelectEventDetails :: Display -> CUInt -> CUInt -> CULong -> CULong -> IO CUInt
foreign import ccall unsafe "X11/XKBlib.h XkbSelectEvents"
xkbSelectEvents :: Display -> CUInt -> CUInt -> CUInt -> IO CUInt
xkbUseCoreKbd :: CUInt
xkbUseCoreKbd = #const XkbUseCoreKbd
xkbStateNotify :: CUInt
xkbStateNotify = #const XkbStateNotify
xkbIndicatorStateNotify :: CUInt
xkbIndicatorStateNotify = #const XkbIndicatorStateNotify
xkbMapNotify :: CUInt
xkbMapNotify = #const XkbMapNotify
xkbMapNotifyMask :: CUInt
xkbMapNotifyMask = #const XkbMapNotifyMask
xkbNewKeyboardNotifyMask :: CUInt
xkbNewKeyboardNotifyMask = #const XkbNewKeyboardNotifyMask
xkbAllStateComponentsMask :: CULong
xkbAllStateComponentsMask = #const XkbAllStateComponentsMask
xkbGroupStateMask :: CULong
xkbGroupStateMask = #const XkbGroupStateMask
xkbSymbolsNameMask :: CUInt
xkbSymbolsNameMask = #const XkbSymbolsNameMask
xkbGroupNamesMask :: CUInt
xkbGroupNamesMask = #const XkbGroupNamesMask
type KbdOpts = [(String, String)]
getLayoutStr :: Display -> IO String
getLayoutStr dpy = do
kbdDescPtr <- xkbAllocKeyboard
status <- xkbGetNames dpy xkbSymbolsNameMask kbdDescPtr
str <- getLayoutStr' status dpy kbdDescPtr
xkbFreeNames kbdDescPtr xkbGroupNamesMask 1
xkbFreeKeyboard kbdDescPtr 0 1
return str
getLayoutStr' :: Status -> Display -> (Ptr XkbDescRec) -> IO String
getLayoutStr' st dpy kbdDescPtr =
if st == 0 then -- Success
do
kbdDesc <- peek kbdDescPtr
nameArray <- peek (names kbdDesc)
atom <- xGetAtomName dpy (symbols nameArray)
str <- peekCString atom
return str
else -- Behaviour on error
do
return "Error while requesting layout!"
|
