{-# LANGUAGE
FlexibleInstances,
FlexibleContexts,
MultiParamTypeClasses,
ExistentialQuantification
#-}
-------------------------------------------------------------------------
-- |
-- Module : XMonad.Config.PlainConfig
-- Copyright : Braden Shepherdson <Braden.Shepherdson@gmail.com>
-- License : BSD3
--
-- Maintainer : Braden Shepherdson <Braden.Shepherdson@gmail.com>
--
-- Proof-of-concept (but usable) plain-text configuration file
-- parser, for use instead of xmonad.hs. Does not require recompilation,
-- allowing xmonad to be free of the GHC dependency.
--
-------------------------------------------------------------------------
module XMonad.Config.PlainConfig
(
-- * Introduction
-- $usage
-- * Supported Layouts
-- $layouts
-- * Support Key Bindings
-- $keys
-- * Other Notes
-- $notes
-- * Example Config File
-- $example
plainConfig ,readConfig, checkConfig
)
where
import XMonad
import System.Exit
import qualified XMonad.StackSet as W
import qualified Data.Map as M
import Data.List
import Data.Maybe (isJust,fromJust)
import Data.Char (isSpace)
--import Control.Monad
import Control.Monad.Error
import Control.Monad.Identity
import Control.Arrow ((&&&))
import Text.ParserCombinators.ReadP
import System.IO
import Control.Exception (bracket)
import XMonad.Util.EZConfig (mkKeymap)
-- $usage
-- The @xmonad.hs@ file is very minimal when used with PlainConfig.
-- It typically contains only the following:
--
-- > module Main where
-- > import XMonad
-- > import XMonad.Config.PlainConfig (plainConfig)
-- > main = plainConfig
--
-- The 'plainConfig' function parses @~\/.xmonad\/xmonad.conf@,
-- the format of which is described below.
-- $layouts
-- Only 'Tall', 'Wide' and 'Full' are supported at present.
-- $keys
--
-- Key bindings are specified as a pair of an arbitrary EZConfig and
-- one of the following:
--
-- @ Name Haskell equivalent Default binding(s)@
--
-- * @spawn \<cmd\> spawn \"\<cmd\>\" none@
--
-- * @kill kill M-S-c@
--
-- * @nextLayout sendMessage NextLayout M-\<Space\>@
--
-- * @refresh refresh M-S-\<Space\>@
--
-- * @focusDown windows W.focusDown M-\<Tab\>, M-j@
--
-- * @focusUp windows W.focusUp M-k@
--
-- * @focusMaster windows W.focusMaster M-m@
--
-- * @swapDown windows W.swapDown M-S-j@
--
-- * @swapUp windows W.swapUp M-S-k@
--
-- * @swapMaster windows W.swapMaster M-\<Return\>@
--
-- * @shrink sendMessage Shrink M-h@
--
-- * @expand sendMessage Expand M-l@
--
-- * @sink withFocused $ windows . W.sink M-t@
--
-- * @incMaster sendMessage (IncMasterN 1) M-,@
--
-- * @decMaster sendMessage (IncMasterN (-1)) M-.@
--
-- * @quit io $ exitWith ExitSuccess M-S-q@
--
-- * @restart broadcastMessageReleaseResources >> restart \"xmonad\" True M-q@
--
-- $notes
-- Submaps are allowed.
-- These settings override the defaults. Changes made here will be used over
-- the default bindings for those keys.
-- $example
-- An example @~\/.xmonad\/xmonad.conf@ file follows:
--
-- @modMask = 3@
--
-- @numlockMask = 2@
--
-- @borderWidth = 1@
--
-- @normalBorderColor = #dddddd@
--
-- @focusedBorderColor = #00ff00@
--
-- @terminal=urxvt@
--
-- @workspaces=[\"1: IRC\",\"2: Web\", \"3\", \"4\", \"5\", \"6\", \"7\", \"8\", \"9\"]@
--
-- @focusFollowsMouse=True@
--
-- @layouts=[\"Tall\",\"Full\",\"Wide\"]@
--
-- @key=(\"M-x t\", \"spawn xmessage Test\")@
--
-- @manageHook=(ClassName \"MPlayer\" , \"float\" )@
--
-- @manageHook=(ClassName \"Gimp\" , \"float\" )@
--
-- @manageHook=(Resource \"desktop_window\", \"ignore\" )@
--
-- @manageHook=(Resource \"kdesktop\" , \"ignore\" )@
--
-- @manageHook=(Resource \"gnome-panel\" , \"ignore\" )@
--
----------------------------------------------------------------
------ Several functions for parsing the key-value file. -------
----------------------------------------------------------------
parseKVBy :: Char -> ReadP (String,String)
parseKVBy sep = do
skipSpaces
k <- munch1 (\x -> x /= ' ' && x /= sep)
skipSpaces
char kvSep
skipSpaces
v <- munch1 (\x -> x /= ' ') --or EOS
return (k,v)
parseKVVBy :: Char -> ReadP (String,String)
parseKVVBy sep = do
skipSpaces
k <- munch1 (\x -> x /= ' ' && x /= sep)
skipSpaces
char kvSep
skipSpaces
v <- munch1 (const True) -- until EOS
return (k,v)
kvSep :: Char
kvSep = '='
parseKV, parseKVV :: ReadP (String,String)
parseKV = parseKVBy kvSep
parseKVV = parseKVVBy kvSep
readKV :: String -> Integer -> RC (String,String)
readKV s ln = case readP_to_S parseKV s of
[((k,v),"")] -> return (k,v) --single, correct parse
[] -> throwError [(ln,"No parse")]
_ -> do
case readP_to_S parseKVV s of
[((k,v),"")] -> return (k,v) --single, correct parse
[] -> throwError [(ln,"No parse")]
xs -> throwError [(ln,"Ambiguous parse: "
++ show xs)]
isComment :: String -> Bool
isComment = not . null . readP_to_S parseComment
where parseComment = skipSpaces >> char '#' >> return ()
-- null means failed parse, so _not_ a comment.
isBlank :: String -> Bool
isBlank = null . filter (not . isSpace)
type RC = ErrorT [(Integer,String)] Identity
instance Error [(Integer,String)] where
noMsg = [(-1, "Unknown error.")]
strMsg s = [(-1, s)]
parseFile :: [String] -> RC (XConfig Layout)
parseFile ss = parseLines baseConfig theLines
where theLines = filter (not . liftM2 (||) isComment isBlank . snd)
$ zip [1..] ss
parseLines :: XConfig Layout -> [(Integer,String)] -> RC (XConfig Layout)
parseLines = foldM parse
parse :: XConfig Layout -> (Integer, String) -> RC (XConfig Layout)
parse xc (ln,s) = do
(k,v) <- readKV s ln
case M.lookup k commands of
Nothing -> throwError [(ln,"Unknown command: "++k)]
Just f -> f v ln xc
----------------------------------------------------------------
-- Now the semantic parts, that convert from the relevant --
-- key-value entries to values in an XConfig --
----------------------------------------------------------------
type Command = String -> Integer -> XConfig Layout -> RC (XConfig Layout)
commands :: M.Map String Command
commands = M.fromList $
[("modMask" , cmd_modMask )
,("numlockMask" , cmd_numlockMask )
,("normalBorderColor" , cmd_normalBorderColor )
,("focusedBorderColor" , cmd_focusedBorderColor)
,("terminal" , cmd_terminal )
,("workspaces" , cmd_workspaces )
,("focusFollowsMouse" , cmd_focusFollowsMouse )
,("layouts" , cmd_layouts )
,("key" , cmd_key )
,("manageHook" , cmd_manageHook )
,("borderWidth" , cmd_borderWidth )
]
-- | Behind-the-scenes helper for both 'cmd_modMask' and 'cmd_numlockMask'.
genericModKey :: (KeyMask -> XConfig Layout) -> Command
genericModKey f s ln _ = do
x <- rcRead s ln :: RC Integer
case lookup x (zip [1..] [mod1Mask,mod2Mask,mod3Mask,mod4Mask,mod5Mask]) of
Just y -> return $ f y
Nothing -> throwError [(ln,"Invalid mod key number: "++ show x)]
-- | Reads the mod key modifier number.
cmd_modMask :: Command
cmd_modMask s ln xc = genericModKey (\k -> xc{modMask = k}) s ln xc
-- | Reads the numlock key modifier number.
cmd_numlockMask :: Command
cmd_numlockMask s ln xc = genericModKey (\k -> xc{numlockMask = k}) s ln xc
-- | Reads the border width.
cmd_borderWidth :: Command
cmd_borderWidth s ln xc = do
w <- rcRead s ln
return $ xc { borderWidth = w }
-- | Reads the colors but just keeps them as RRGGBB Strings.
cmd_normalBorderColor, cmd_focusedBorderColor :: Command
cmd_normalBorderColor s _ xc = return $ xc{ normalBorderColor = s }
cmd_focusedBorderColor s _ xc = return $ xc{ focusedBorderColor = s }
-- | Reads the terminal. It is just a String, no parsing.
cmd_terminal :: Command
cmd_terminal s _ xc = return $ xc{ terminal = s }
-- | Reads the workspace tag list. This is given as a Haskell [String].
cmd_workspaces :: Command
cmd_workspaces s ln xc = rcRead s ln >>= \x -> return xc{ workspaces = x }
-- | Reads the focusFollowsMouse, as a Haskell Bool.
cmd_focusFollowsMouse :: Command
cmd_focusFollowsMouse s ln xc = rcRead s ln >>=
\x -> return xc{focusFollowsMouse = x}
-- | The list known layouts, mapped by name.
-- An easy location for improvement is to add more contrib layouts here.
layouts :: M.Map String (Layout Window)
layouts = M.fromList
[("Tall", Layout (Tall 1 (3/100) (1/2)))
,("Wide", Layout (Mirror (Tall 1 (3/100) (1/2))))
,("Full", Layout Full)
]
-- | Expects a [String], the strings being layout names. Quotes required.
-- Draws from the `layouts' list above.
cmd_layouts :: Command
cmd_layouts s ln xc = do
xs <- rcRead s ln -- read the list of strings
let ls = map (id &&& (flip M.lookup) layouts) xs
when (null ls) $ throwError [(ln,"Empty layout list")]
case filter (not . isJust . snd) ls of
[] -> return $ xc{ layoutHook = foldr1
(\(Layout l) (Layout r) ->
Layout (l ||| r)) (map (fromJust . snd) ls)
}
ys -> throwError $ map (\(x,_) -> (ln, "Unknown layout: "++ x)) ys
-- | A Map from names to key binding actions.
key_actions :: M.Map String (X ())
key_actions = M.fromList
[("kill" , kill )
,("nextLayout" , sendMessage NextLayout )
--,("prevLayout" , sendMessage PrevLayout )
--,("resetLayout" , setLayout $ XMonad.layoutHook conf)
,("refresh" , refresh )
,("focusDown" , windows W.focusDown )
,("focusUp" , windows W.focusUp )
,("focusMaster" , windows W.focusMaster )
,("swapMaster" , windows W.swapMaster )
,("swapDown" , windows W.swapDown )
,("swapUp" , windows W.swapUp )
,("shrink" , sendMessage Shrink )
,("expand" , sendMessage Expand )
,("sink" , withFocused $ windows . W.sink)
,("incMaster" , sendMessage (IncMasterN 1))
,("decMaster" , sendMessage (IncMasterN (-1)))
,("quit" , io $ exitWith ExitSuccess)
,("restart" , broadcastMessage ReleaseResources
>> restart "xmonad" True)
]
-- | Expects keys as described in the preamble, as
-- (\"EZConfig key name\", \"action name\"),
-- eg. (\"M-S-t\", \"spawn thunderbird\")
-- One key per "key=" line.
cmd_key :: Command
cmd_key s ln xc = do
(k,v) <- rcRead s ln
if "spawn " `isPrefixOf` v
then return $ xc {
keys = \c -> M.union (mkKeymap c
[(k, spawn (drop 6 v))]
) ((keys xc) c)
}
else do
case M.lookup v key_actions of
Nothing -> throwError [(ln, "Unknown key action \"" ++ v ++ "\"")]
Just ac -> return $
xc { keys = \c -> M.union (mkKeymap c [(k, ac)])
((keys xc) c)
}
-- | Map of names to actions for 'ManageHook's.
manageHook_actions :: M.Map String ManageHook
manageHook_actions = M.fromList
[("float" , doFloat )
,("ignore" , doIgnore )
]
-- | Parses 'ManageHook's in the form given in the preamble.
-- eg. (ClassName \"MPlayer\", \"float\")
cmd_manageHook :: Command
cmd_manageHook s ln xc = do
(k,v) <- rcRead s ln
let q = parseQuery k
if "toWorkspace " `isPrefixOf` v
then return $ xc { manageHook = manageHook xc <+>
(q --> doShift (drop 12 v))
}
else case M.lookup v manageHook_actions of
Nothing -> throwError [(ln, "Unknown ManageHook action \""
++ v ++ "\"")]
Just ac -> return $ xc { manageHook = manageHook xc <+> (q --> ac) }
-- | Core of the ManageHook expression parser.
-- Taken from Roman Cheplyaka's WindowProperties
parseQuery :: Property -> Query Bool
parseQuery (Title s) = title =? s
parseQuery (ClassName s) = className =? s
parseQuery (Resource s) = resource =? s
parseQuery (And p q) = parseQuery p <&&> parseQuery q
parseQuery (Or p q) = parseQuery p <&&> parseQuery q
parseQuery (Not p) = not `fmap` parseQuery p
parseQuery (Const b) = return b
-- | Property constructors are quite self-explaining.
-- Taken from Roman Cheplyaka's WindowProperties
data Property = Title String
| ClassName String
| Resource String
| And Property Property
| Or Property Property
| Not Property
| Const Bool
deriving (Read, Show)
-- | A wrapping of the read function into the RC monad.
rcRead :: (Read a) => String -> Integer -> RC a
rcRead s ln = case reads s of
[(x,"")] -> return x
_ -> throwError [(ln, "Failed to parse value")]
-- | The standard Config.hs 'defaultConfig', with the layout wrapped.
baseConfig :: XConfig Layout
baseConfig = defaultConfig{ layoutHook = Layout (layoutHook defaultConfig) }
-- | Core function that attempts to parse @~\/.xmonad\/xmonad.conf@
readConfig :: IO (Maybe (XConfig Layout))
readConfig = do
cs <- bracket (openFile "/home/braden/.xmonad/xmonad.conf" ReadMode)
(\h -> hClose h) -- vv force the lazy IO
(\h -> (lines `fmap` hGetContents h) >>= \ss ->
length ss `seq` return ss)
let xce = runIdentity $ runErrorT $ parseFile cs
case xce of
Left es -> mapM_ (\(ln,e) ->
putStrLn $ "readConfig error: line "++show ln++
": "++ e) es
>> return Nothing
Right xc -> return $ Just xc
-- | Attempts to run readConfig, and checks if it failed.
checkConfig :: IO Bool
checkConfig = isJust `fmap` readConfig
{- REMOVED: It was for debugging, and causes an 'orphaned instances'
warning to boot.
-- | Reads in the config, and then prints the resulting XConfig
dumpConfig :: IO ()
dumpConfig = readConfig >>= print
instance Show (XConfig Layout) where
show x = "XConfig { "
++ "normalBorderColor = "++ normalBorderColor x ++", "
++ "focusedBorderColor = "++ focusedBorderColor x++", "
++ "terminal = "++ terminal x ++", "
++ "workspaces = "++ show (workspaces x) ++", "
++ "numlockMask = "++ show (numlockMask x) ++", "
++ "modMask = "++ show (modMask x) ++", "
++ "borderWidth = "++ show (borderWidth x) ++", "
++ "focusFollowsMouse = "++ show (focusFollowsMouse x) ++", "
++ "layouts = "++ show (layoutHook x) ++" }"
-}
-- | Handles the unwrapping of the Layout. Intended for use as
-- @main = plainConfig@
plainConfig :: IO ()
plainConfig = do
conf <- readConfig
case conf of
(Just xc@XConfig{layoutHook= (Layout l)}) ->
xmonad (xc{ layoutHook = l })
Nothing ->
spawn $ "xmessage Failed to read xmonad.conf. See xmonad.errors."
