The app dir

2 files changed, 367 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,[])
diff --git a/app/Main.hs b/app/Main.hs
new file mode 100644
index 0000000..0760d16
--- /dev/null
+++ b/app/Main.hs
@@ -0,0 +1,170 @@
+{-# LANGUAGE FlexibleContexts #-}
+-----------------------------------------------------------------------------
+-- |
+-- Module      :  Xmobar.Main
+-- Copyright   :  (c) Andrea Rossato
+-- License     :  BSD-style (see LICENSE)
+--
+-- Maintainer  :  Jose A. Ortega Ruiz <jao@gnu.org>
+-- Stability   :  unstable
+-- Portability :  unportable
+--
+-- The main module of Xmobar, a text based status bar
+--
+-----------------------------------------------------------------------------
+
+module Main (main) where
+
+import Data.List (intercalate)
+
+import Data.Version (showVersion)
+import System.Console.GetOpt
+import System.Exit
+import System.Environment (getArgs)
+import Control.Monad (unless)
+import Text.Read (readMaybe)
+
+import Xmobar (xmobar)
+import Xmobar.Config
+
+import Paths_xmobar (version)
+import Configuration (readConfig, readDefaultConfig)
+
+-- $main
+
+-- | The main entry point
+main :: IO ()
+main = do
+  (o,file) <- getArgs >>= getOpts
+  (c,defaultings) <- case file of
+                       [cfgfile] -> readConfig cfgfile usage
+                       _ -> readDefaultConfig usage
+  unless (null defaultings) $ putStrLn $
+    "Fields missing from config defaulted: " ++ intercalate "," defaultings
+  doOpts c o >>= xmobar
+
+data Opts = Help
+          | Version
+          | Font       String
+          | BgColor    String
+          | FgColor    String
+          | Alpha      String
+          | T
+          | B
+          | D
+          | AlignSep   String
+          | Commands   String
+          | AddCommand String
+          | SepChar    String
+          | Template   String
+          | OnScr      String
+          | IconRoot   String
+          | Position   String
+          | WmClass    String
+          | WmName     String
+       deriving Show
+
+options :: [OptDescr Opts]
+options =
+    [ Option "h?" ["help"] (NoArg Help) "This help"
+    , Option "V" ["version"] (NoArg Version) "Show version information"
+    , Option "f" ["font"] (ReqArg Font "font name") "The font name"
+    , Option "w" ["wmclass"] (ReqArg WmClass "class") "X11 WM_CLASS property"
+    , Option "n" ["wmname"] (ReqArg WmName "name") "X11 WM_NAME property"
+    , Option "B" ["bgcolor"] (ReqArg BgColor "bg color" )
+      "The background color. Default black"
+    , Option "F" ["fgcolor"] (ReqArg FgColor "fg color")
+      "The foreground color. Default grey"
+    , Option "i" ["iconroot"] (ReqArg IconRoot "path")
+      "Root directory for icon pattern paths. Default '.'"
+    , Option "A" ["alpha"] (ReqArg Alpha "alpha")
+      "The transparency: 0 is transparent, 255 is opaque. Default: 255"
+    , Option "o" ["top"] (NoArg T) "Place xmobar at the top of the screen"
+    , Option "b" ["bottom"] (NoArg B)
+      "Place xmobar at the bottom of the screen"
+    , Option "d" ["dock"] (NoArg D)
+      "Don't override redirect from WM and function as a dock"
+    , Option "a" ["alignsep"] (ReqArg AlignSep "alignsep")
+      "Separators for left, center and right text\nalignment. Default: '}{'"
+    , Option "s" ["sepchar"] (ReqArg SepChar "char")
+      ("The character used to separate commands in" ++
+       "\nthe output template. Default '%'")
+    , Option "t" ["template"] (ReqArg Template "template")
+      "The output template"
+    , Option "c" ["commands"] (ReqArg Commands "commands")
+      "The list of commands to be executed"
+    , Option "C" ["add-command"] (ReqArg AddCommand "command")
+      "Add to the list of commands to be executed"
+    , Option "x" ["screen"] (ReqArg OnScr "screen")
+      "On which X screen number to start"
+    , Option "p" ["position"] (ReqArg Position "position")
+      "Specify position of xmobar. Same syntax as in config file"
+    ]
+
+getOpts :: [String] -> IO ([Opts], [String])
+getOpts argv =
+    case getOpt Permute options argv of
+      (o,n,[])   -> return (o,n)
+      (_,_,errs) -> error (concat errs ++ usage)
+
+usage :: String
+usage = usageInfo header options ++ footer
+    where header = "Usage: xmobar [OPTION...] [FILE]\nOptions:"
+          footer = "\nMail bug reports and suggestions to " ++ mail ++ "\n"
+
+info :: String
+info = "xmobar " ++ showVersion version
+        ++ "\n (C) 2007 - 2010 Andrea Rossato "
+        ++ "\n (C) 2010 - 2018 Jose A Ortega Ruiz\n "
+        ++ mail ++ "\n" ++ license
+
+mail :: String
+mail = "<mail@jao.io>"
+
+license :: String
+license = "\nThis program is distributed in the hope that it will be useful," ++
+          "\nbut WITHOUT ANY WARRANTY; without even the implied warranty of" ++
+          "\nMERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE." ++
+          "\nSee the License for more details."
+
+doOpts :: Config -> [Opts] -> IO Config
+doOpts conf [] =
+  return (conf {lowerOnStart = lowerOnStart conf && overrideRedirect conf})
+doOpts conf (o:oo) =
+  case o of
+    Help -> putStr   usage >> exitSuccess
+    Version -> putStrLn info  >> exitSuccess
+    Font s -> doOpts' (conf {font = s})
+    WmClass s -> doOpts' (conf {wmClass = s})
+    WmName s -> doOpts' (conf {wmName = s})
+    BgColor s -> doOpts' (conf {bgColor = s})
+    FgColor s -> doOpts' (conf {fgColor = s})
+    Alpha n -> doOpts' (conf {alpha = read n})
+    T -> doOpts' (conf {position = Top})
+    B -> doOpts' (conf {position = Bottom})
+    D -> doOpts' (conf {overrideRedirect = False})
+    AlignSep s -> doOpts' (conf {alignSep = s})
+    SepChar s -> doOpts' (conf {sepChar = s})
+    Template s -> doOpts' (conf {template = s})
+    IconRoot s -> doOpts' (conf {iconRoot = s})
+    OnScr n -> doOpts' (conf {position = OnScreen (read n) $ position conf})
+    Commands s -> case readCom 'c' s of
+                    Right x -> doOpts' (conf {commands = x})
+                    Left e -> putStr (e ++ usage) >> exitWith (ExitFailure 1)
+    AddCommand s -> case readCom 'C' s of
+                      Right x -> doOpts' (conf {commands = commands conf ++ x})
+                      Left e -> putStr (e ++ usage) >> exitWith (ExitFailure 1)
+    Position s -> readPosition s
+  where readCom c str =
+          case readStr str of
+            [x] -> Right x
+            _  -> Left ("xmobar: cannot read list of commands " ++
+                        "specified with the -" ++ c:" option\n")
+        readStr str = [x | (x,t) <- reads str, ("","") <- lex t]
+        doOpts' opts = doOpts opts oo
+        readPosition string =
+            case readMaybe string of
+                Just x  -> doOpts' (conf { position = x })
+                Nothing -> do
+                    putStrLn "Can't parse position option, ignoring"
+                    doOpts' conf