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Diffstat (limited to 'app/Configuration.hs')
| -rw-r--r-- | app/Configuration.hs | 197 |
1 files changed, 197 insertions, 0 deletions
diff --git a/app/Configuration.hs b/app/Configuration.hs new file mode 100644 index 0000000..1cf3ebf --- /dev/null +++ b/app/Configuration.hs @@ -0,0 +1,197 @@ +{-# 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.Config as C + +#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 (C.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 $ C.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 C.font "font" + pFontList = strListField C.additionalFonts "additionalFonts" + pWmClass = strField C.wmClass "wmClass" + pWmName = strField C.wmName "wmName" + pBgColor = strField C.bgColor "bgColor" + pFgColor = strField C.fgColor "fgColor" + pBdColor = strField C.borderColor "borderColor" + pSepChar = strField C.sepChar "sepChar" + pAlignSep = strField C.alignSep "alignSep" + pTemplate = strField C.template "template" + + pTextOffset = readField C.textOffset "textOffset" + pTextOffsets = readIntList C.textOffsets "textOffsets" + pIconOffset = readField C.iconOffset "iconOffset" + pPosition = readField C.position "position" + pHideOnStart = readField C.hideOnStart "hideOnStart" + pLowerOnStart = readField C.lowerOnStart "lowerOnStart" + pPersistent = readField C.persistent "persistent" + pBorder = readField C.border "border" + pBdWidth = readField C.borderWidth "borderWidth" + pAllDesktops = readField C.allDesktops "allDesktops" + pOverrideRedirect = readField C.overrideRedirect "overrideRedirect" + pPickBroadest = readField C.pickBroadest "pickBroadest" + pIconRoot = readField C.iconRoot "iconRoot" + pAlpha = readField C.alpha "alpha" + + pCommands = field C.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 C.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 (C.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 (C.Config,[String]) +readDefaultConfig usage = do + xdgConfigFile <- C.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 (C.defaultConfig,[]) |