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|
{-# LANGUAGE FlexibleContexts, CPP #-}
------------------------------------------------------------------------------
-- |
-- Module: Configuration
-- Copyright: (c) 2018 Jose Antonio Ortega Ruiz
-- License: BSD3-style (see LICENSE)
--
-- Maintainer: jao@gnu.org
-- Stability: unstable
-- Portability: portable
-- Created: Wed Nov 21, 2018 23:13
--
--
-- Parsing configuration files
--
------------------------------------------------------------------------------
module Configuration (readConfig, readDefaultConfig) where
import Text.ParserCombinators.Parsec
import Text.ParserCombinators.Parsec.Number (int)
import Text.ParserCombinators.Parsec.Perm ((<|?>), (<$?>), permute)
import Control.Monad.IO.Class (liftIO)
import System.Environment
import System.Posix.Files (fileExist)
import qualified Xmobar as X
#if defined XFT || defined UTF8
import qualified System.IO as S (readFile,hGetLine)
#endif
readFileSafe :: FilePath -> IO String
#if defined XFT || defined UTF8
readFileSafe = S.readFile
#else
readFileSafe = readFile
#endif
stripComments :: String -> String
stripComments =
unlines . map (drop 5 . strip False . (replicate 5 ' '++)) . lines
where strip m ('-':'-':xs) = if m then "--" ++ strip m xs else ""
strip m ('"':xs) = '"': strip (not m) xs
strip m (x:xs) = x : strip m xs
strip _ [] = []
-- | Parse the config, logging a list of fields that were missing and replaced
-- by the default definition.
parseConfig :: String -> Either ParseError (X.Config,[String])
parseConfig = runParser parseConf fields "Config" . stripComments
where
parseConf = do
many space
sepEndSpc ["Config","{"]
x <- perms
eof
s <- getState
return (x,s)
perms = permute $ X.Config
<$?> pFont <|?> pFontList <|?> pWmClass <|?> pWmName
<|?> pBgColor <|?> pFgColor
<|?> pPosition <|?> pTextOffset <|?> pTextOffsets
<|?> pIconOffset <|?> pBorder
<|?> pBdColor <|?> pBdWidth <|?> pAlpha <|?> pHideOnStart
<|?> pAllDesktops <|?> pOverrideRedirect <|?> pPickBroadest
<|?> pLowerOnStart <|?> pPersistent <|?> pIconRoot
<|?> pCommands <|?> pSepChar <|?> pAlignSep <|?> pTemplate
fields = [ "font", "additionalFonts","bgColor", "fgColor"
, "wmClass", "wmName", "sepChar"
, "alignSep" , "border", "borderColor" ,"template"
, "position" , "textOffset", "textOffsets", "iconOffset"
, "allDesktops", "overrideRedirect", "pickBroadest"
, "hideOnStart", "lowerOnStart", "persistent", "iconRoot"
, "alpha", "commands"
]
pFont = strField X.font "font"
pFontList = strListField X.additionalFonts "additionalFonts"
pWmClass = strField X.wmClass "wmClass"
pWmName = strField X.wmName "wmName"
pBgColor = strField X.bgColor "bgColor"
pFgColor = strField X.fgColor "fgColor"
pBdColor = strField X.borderColor "borderColor"
pSepChar = strField X.sepChar "sepChar"
pAlignSep = strField X.alignSep "alignSep"
pTemplate = strField X.template "template"
pTextOffset = readField X.textOffset "textOffset"
pTextOffsets = readIntList X.textOffsets "textOffsets"
pIconOffset = readField X.iconOffset "iconOffset"
pPosition = readField X.position "position"
pHideOnStart = readField X.hideOnStart "hideOnStart"
pLowerOnStart = readField X.lowerOnStart "lowerOnStart"
pPersistent = readField X.persistent "persistent"
pBorder = readField X.border "border"
pBdWidth = readField X.borderWidth "borderWidth"
pAllDesktops = readField X.allDesktops "allDesktops"
pOverrideRedirect = readField X.overrideRedirect "overrideRedirect"
pPickBroadest = readField X.pickBroadest "pickBroadest"
pIconRoot = readField X.iconRoot "iconRoot"
pAlpha = readField X.alpha "alpha"
pCommands = field X.commands "commands" readCommands
staticPos = do string "Static"
wrapSkip (string "{")
p <- many (noneOf "}")
wrapSkip (string "}")
string ","
return ("Static {" ++ p ++ "}")
tillFieldEnd = staticPos <|> many (noneOf ",}\n\r")
commandsEnd = wrapSkip (string "]") >> (string "}" <|> notNextRun)
notNextRun = do {string ","
; notFollowedBy $ wrapSkip $ string "Run"
; return ","
}
readCommands = manyTill anyChar (try commandsEnd) >>=
read' commandsErr . flip (++) "]"
strField e n = field e n strMulti
strMulti = scan '"'
where
scan lead = do
spaces
char lead
s <- manyTill anyChar (rowCont <|> unescQuote)
(char '"' >> return s) <|> fmap (s ++) (scan '\\')
rowCont = try $ char '\\' >> string "\n"
unescQuote = lookAhead (noneOf "\\") >> lookAhead (string "\"")
strListField e n = field e n strList
strList = do
spaces
char '['
list <- sepBy (strMulti >>= \x -> spaces >> return x) (char ',')
spaces
char ']'
return list
wrapSkip x = many space >> x >>= \r -> many space >> return r
sepEndSpc = mapM_ (wrapSkip . try . string)
fieldEnd = many $ space <|> oneOf ",}"
field e n c = (,) (e X.defaultConfig) $
updateState (filter (/= n)) >> sepEndSpc [n,"="] >>
wrapSkip c >>= \r -> fieldEnd >> return r
readField a n = field a n $ tillFieldEnd >>= read' n
readIntList d n = field d n intList
intList = do
spaces
char '['
list <- sepBy (spaces >> int >>= \x-> spaces >> return x) (char ',')
spaces
char ']'
return list
read' d s = case reads s of
[(x, _)] -> return x
_ -> fail $ "error reading the " ++ d ++ " field: " ++ s
commandsErr :: String
commandsErr = "commands: this usually means that a command could not" ++
"\nbe parsed." ++
"\nThe error could be located at the begining of the command" ++
"\nwhich follows the offending one."
-- | Reads the configuration files or quits with an error
readConfig :: FilePath -> String -> IO (X.Config,[String])
readConfig f usage = do
file <- liftIO $ fileExist f
s <- liftIO $ if file then readFileSafe f else error $
f ++ ": file not found!\n" ++ usage
either (\err -> error $ f ++
": configuration file contains errors at:\n" ++ show err)
return $ parseConfig s
-- | Read default configuration file or load the default config
readDefaultConfig :: String -> IO (X.Config,[String])
readDefaultConfig usage = do
xdgConfigFile <- X.getXdgConfigFile
xdgConfigFileExists <- liftIO $ fileExist xdgConfigFile
home <- liftIO $ getEnv "HOME"
let defaultConfigFile = home ++ "/.xmobarrc"
defaultConfigFileExists <- liftIO $ fileExist defaultConfigFile
if xdgConfigFileExists
then readConfig xdgConfigFile usage
else if defaultConfigFileExists
then readConfig defaultConfigFile usage
else return (X.defaultConfig,[])
|
