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Diffstat (limited to 'src/Xmobar/Config/Parse.hs')
| -rw-r--r-- | src/Xmobar/Config/Parse.hs | 176 |
1 files changed, 176 insertions, 0 deletions
diff --git a/src/Xmobar/Config/Parse.hs b/src/Xmobar/Config/Parse.hs new file mode 100644 index 0000000..1a57ffa --- /dev/null +++ b/src/Xmobar/Config/Parse.hs @@ -0,0 +1,176 @@ +{-# LANGUAGE FlexibleContexts, CPP #-} +------------------------------------------------------------------------------ +-- | +-- Module: Xmobar.Config.Parse +-- Copyright: (c) 2018 Jose Antonio Ortega Ruiz +-- License: BSD3-style (see LICENSE) +-- +-- Maintainer: jao@gnu.org +-- Stability: unstable +-- Portability: portable +-- Created: Sun Nov 25, 2018 23:56 +-- +-- +-- Parsing of configuration files +-- +------------------------------------------------------------------------------ + + +module Xmobar.Config.Parse(readConfig, parseConfig) where + +import Text.ParserCombinators.Parsec +import Text.ParserCombinators.Parsec.Number (int) +import Text.ParserCombinators.Parsec.Perm ((<|?>), (<$?>), permute) +import Control.Monad.IO.Class (liftIO) + +import Xmobar.Config.Types + +#if defined XFT || defined UTF8 +import qualified System.IO as S (readFile) +#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 :: Config -> String -> Either ParseError (Config,[String]) +parseConfig defaultConfig = + runParser parseConf fields "Config" . stripComments + where + parseConf = do + many space + sepEndSpc ["Config","{"] + x <- perms + eof + s <- getState + return (x,s) + + perms = permute $ 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 font "font" + pFontList = strListField additionalFonts "additionalFonts" + pWmClass = strField wmClass "wmClass" + pWmName = strField wmName "wmName" + pBgColor = strField bgColor "bgColor" + pFgColor = strField fgColor "fgColor" + pBdColor = strField borderColor "borderColor" + pSepChar = strField sepChar "sepChar" + pAlignSep = strField alignSep "alignSep" + pTemplate = strField template "template" + + pTextOffset = readField textOffset "textOffset" + pTextOffsets = readIntList textOffsets "textOffsets" + pIconOffset = readField iconOffset "iconOffset" + pPosition = readField position "position" + pHideOnStart = readField hideOnStart "hideOnStart" + pLowerOnStart = readField lowerOnStart "lowerOnStart" + pPersistent = readField persistent "persistent" + pBorder = readField border "border" + pBdWidth = readField borderWidth "borderWidth" + pAllDesktops = readField allDesktops "allDesktops" + pOverrideRedirect = readField overrideRedirect "overrideRedirect" + pPickBroadest = readField pickBroadest "pickBroadest" + pIconRoot = readField iconRoot "iconRoot" + pAlpha = readField alpha "alpha" + + pCommands = field 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 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 from a file or an error if it cannot be +-- parsed. +readConfig :: Config -> FilePath -> IO (Either ParseError (Config,[String])) +readConfig defaultConfig f = + liftIO (readFileSafe f) >>= return . parseConfig defaultConfig |