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+{-# LANGUAGE FlexibleContexts #-}
+
+------------------------------------------------------------------------------
+-- |
+-- 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 (parseConfig) where
+
+import Text.ParserCombinators.Parsec
+import Text.ParserCombinators.Parsec.Number (int)
+import Text.ParserCombinators.Parsec.Perm ((<|?>), (<$?>), permute)
+
+import qualified Xmobar.Config as C
+
+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."