removed src for 2.9

1 files changed, 0 insertions, 591 deletions

diff --git a/src/GF/Shell.hs b/src/GF/Shell.hs
deleted file mode 100644
index 1d723bc62..000000000
--- a/src/GF/Shell.hs
+++ /dev/null
@@ -1,591 +0,0 @@
-----------------------------------------------------------------------
--- |
--- Module      : Shell
--- Maintainer  : AR
--- Stability   : (stable)
--- Portability : (portable)
---
--- > CVS $Date: 2005/11/07 20:15:05 $ 
--- > CVS $Author: bringert $
--- > CVS $Revision: 1.50 $
---
--- GF shell command interpreter.
------------------------------------------------------------------------------
-
-module GF.Shell where
-
---- abstract away from these?
-import GF.Data.Str
-import qualified GF.Grammar.Grammar as G
-import qualified GF.Infra.Ident as I
-import qualified GF.Grammar.Compute as Co
-import qualified GF.Compile.CheckGrammar as Ch
-import qualified GF.Grammar.Lookup as L
-import qualified GF.Canon.GFC as GFC
-import qualified GF.Canon.Look as Look
-import qualified GF.Canon.CMacros as CMacros
-import qualified GF.Grammar.MMacros as MMacros
-import qualified GF.Compile.GrammarToCanon as GrammarToCanon
-import GF.Grammar.Values
-import GF.UseGrammar.GetTree
-import GF.UseGrammar.Generate (generateAll) ---- should be in API
-import GF.UseGrammar.Treebank
-import GF.UseGrammar.TreeSelections (getOverloadResults)
-
-import GF.Shell.ShellCommands
-
-import GF.Visualization.VisualizeGrammar (visualizeCanonGrammar, visualizeSourceGrammar)
-import GF.Visualization.VisualizeTree (visualizeTrees)
-import GF.API
-import GF.API.IOGrammar
-import GF.Compile.Compile
----- import GFTex
-import GF.Shell.TeachYourself -- also a subshell
-
-import GF.UseGrammar.Randomized ---
-import GF.UseGrammar.Editing (goFirstMeta) ---
-
-import GF.Probabilistic.Probabilistic
-
-import GF.Compile.ShellState
-import GF.Infra.Option
-import GF.UseGrammar.Information
-import GF.Shell.HelpFile
-import GF.Compile.PrOld
-import GF.Compile.Wordlist
-import GF.Grammar.PrGrammar
-
-import Control.Monad (foldM,liftM)
-import System (system)
-import System.IO (hPutStrLn, stderr)
-import System.Random (newStdGen) ----
-import Data.List (nub,isPrefixOf)
-import GF.Data.Zipper ----
-
-import GF.Data.Operations
-import GF.Infra.UseIO
-import GF.Text.UTF8 (encodeUTF8)
-import Data.Char (isDigit)
-import Data.Maybe (fromMaybe)
-
-import GF.System.Signal (runInterruptibly)
-import System.Exit (exitFailure)
-import System.FilePath
-
----- import qualified GrammarToGramlet as Gr
----- import qualified GrammarToCanonXML2 as Canon
-
--- AR 18/4/2000 - 7/11/2001
-
--- data Command moved to ShellCommands. AR 27/5/2004
-
-type CommandLine = (CommandOpt, CommandArg,  [CommandOpt])
-
--- | term as returned by the command parser
-type SrcTerm = G.Term 
-
--- | history & CPU
-type HState  = (ShellState,([String],Integer,ShMacros,ShTerms)) 
-
-type ShMacros = [(String,[String])] -- dc %c = ... #1 ... #2 ...
-type ShTerms  = [(String,Tree)]     -- dt $e = f ...
-
-type ShellIO = (HState, CommandArg) -> IO (HState, CommandArg)
-
-initHState :: ShellState -> HState
-initHState st = (st,([],0,[],[]))
-
-cpuHState :: HState -> Integer
-cpuHState (_,(_,i,_,_)) = i
-
-optsHState :: HState -> Options
-optsHState (st,_) = globalOptions st
-
-putHStateCPU :: Integer -> HState -> HState
-putHStateCPU cpu (st,(h,_,c,t)) = (st,(h,cpu,c,t))
-
-updateHistory :: String -> HState -> HState
-updateHistory s (st,(h,cpu,c,t)) = (st,(s:h,cpu,c,t))
-
-addShMacro :: (String,[String]) -> HState -> HState
-addShMacro m (st,(h,cpu,c,t)) = (st,(h,cpu,m:c,t))
-
-addShTerm :: (String,Tree) -> HState -> HState
-addShTerm m (st,(h,cpu,c,t)) = (st,(h,cpu,c,m:t))
-
-resolveShMacro :: HState -> String -> [String] -> [String]
-resolveShMacro st@(_,(_,_,cs,_)) c args = case lookup c cs of
-  Just def -> map subst def
-  _ -> [] ----
- where
-   subst s = case s of
-     "#1" -> unwords args
-     _ -> s
- --- so far only one arg allowed - how to determine arg boundaries?
-{-
-   subst s = case s of
-     '#':d@(_:_) | all isDigit d -> 
-        let i = read d in if i > lg then s else args !! (i-1) -- #1 is first
-     _ -> s
-   lg = length args
--}
-
-lookupShTerm :: HState -> String -> Maybe Tree
-lookupShTerm st@(_,(_,_,_,ts)) c = lookup c ts
-
-txtHelpMacros :: HState -> String
-txtHelpMacros (_,(_,_,cs,ts)) = unlines $
-  ["Defined commands:",""] ++
-  [c +++ "=" +++ unwords def | (c,def) <- cs] ++
-  ["","Defined terms:",""] ++
-  [c +++ "=" +++ prt_ def | (c,def) <- ts]
-
--- | empty command if index over
-earlierCommandH :: HState -> Int -> String
-earlierCommandH (_,(h,_,_,_)) = ((h ++ repeat "") !!) 
-
-execLinesH :: String -> [CommandLine] -> HState -> IO HState
-execLinesH s cs hst@(st, (h,_,_,_)) = do
-  (_,st') <- execLinesI True cs hst
-  cpu     <- prOptCPU (optsHState st') (cpuHState hst)
-  return $ putHStateCPU cpu $ updateHistory s st'
-
--- | Like 'execLines', but can be interrupted by SIGINT.
-execLinesI :: Bool -> [CommandLine] -> HState -> IO ([String],HState)
-execLinesI put cs st = 
-    do
-    x <- runInterruptibly (execLines put cs st)
-    case x of
-           Left ex -> do hPutStrLn stderr ""
-                         hPutStrLn stderr $ show ex
-                         return ([],st)
-           Right y -> return y
-
-ifImpure :: [CommandLine] -> Maybe (ImpureCommand,Options)
-ifImpure cls = foldr (const . Just) Nothing [(c,os) | ((CImpure c,os),_,_) <- cls]
-
--- | the main function: execution of commands. 'put :: Bool' forces immediate output
---
--- command line with consecutive (;) commands: no value transmitted
-execLines :: Bool -> [CommandLine] -> HState -> IO ([String],HState)
-execLines put cs st = foldM (flip (execLine put)) ([],st) cs
-
--- | command line with piped (|) commands: no value returned
-execLine :: Bool -> CommandLine -> ([String],HState) -> IO ([String],HState)
-execLine put (c@(co, os), arg, cs) (outps,st) = do
-  (st',val) <- execC c (st, arg)
-  let tr = oElem doTrace os || null cs    -- option -tr leaves trace in pipe
-      make = oElem (iOpt "make") os
-      isErr = case arg of 
-                AError _ -> True
-                _ -> False
-      utf = if (oElem useUTF8 os) then encodeUTF8 else id 
-      outp = if tr then [utf (prCommandArg val)] else []
-  if put then mapM_ putStrLnFlush outp else return ()
-  if make && isErr
-    then exitFailure
-    else execs cs val (if put then [] else outps ++ outp, st')
- where
-    execs []     arg st = return st
-    execs (c:cs) arg st = execLine put (c, arg, cs) st
-
--- | individual commands possibly piped: value returned; this is not a state monad
-execC :: CommandOpt -> ShellIO
-execC co@(comm, opts0) sa@(sh@(st,(h,_,_,_)),a) = checkOptions st co >> case comm of
-
-  CImport file | takeExtensions file == ".gfwl" -> do
-    fs <- mkWordlist file
-    foldM (\x y -> execC (CImport y, opts) x) sa fs
-
-  CImport file | oElem fromExamples opts -> do
-    es <- liftM nub $ getGFEFiles opts file
-    system $ "gf -examples" +++ unlines es
-    execC (comm, removeOption fromExamples opts) sa
-  CImport file -> useIOE sa $ do
-    st1 <- shellStateFromFiles opts st file
-    ioeIO $ changeState (const st1) sa --- \ ((_,h),a) -> ((st,h), a))
-
-  CEmptyState    -> changeState reinitShellState sa
-  CChangeMain ma -> changeStateErr (changeMain ma) sa
-  CStripState    -> changeState purgeShellState sa
-
-  CRemoveLanguage lan -> changeState (removeLang lan) sa
-{-
-  CTransformGrammar file -> do
-    s <- transformGrammarFile opts file
-    returnArg (AString s) sa
-  CConvertLatex file -> do
-    s <- readFileIf file
-    returnArg (AString (convertGFTex s)) sa 
--}
-  CPrintHistory -> (returnArg $ AString $ unlines $ reverse h) sa
-  -- good to have here for piping; eh and ec must be done on outer level
-
-  CDefineCommand c args -> return (addShMacro (c,args) sh, AUnit)
-  CDefineTerm c -> do 
-    let 
-      a' = case a of
-        ASTrm _ -> s2t a
-        AString _ -> s2t a
-        _ -> a
-    case a' of
-      ATrms [trm] -> return (addShTerm (c,trm) sh, AUnit) 
-      _ ->  returnArg (AError "illegal term definition") sa
-
-  CLinearize [] 
-    | oElem showMulti opts -> 
-
-       changeArg (opTS2CommandArg (
-         unlines . 
-         (\t -> [optLinearizeTreeVal opts gr t | gr <- allStateGrammars st])) . s2t) sa
-
-    | otherwise -> changeArg (opTS2CommandArg (optLinearizeTreeVal opts gro) . s2t) sa
-----  CLinearize m -> changeArg (opTS2CommandArg (optLinearizeArgForm opts gro m)) sa
-
-  CParse 
-----    | oElem showMulti opts -> do
-    | oElem (iOpt "overload") opts -> do
-       p <- parse $ prCommandArg a
-       changeArg (opTTs2CommandArg getOverloadResults) p
-    | oElem byLines opts -> do
-        let ss = (if oElem showAll opts then id else filter (not . null)) $ 
-                     lines $ prCommandArg a
-        mts <- mapM parse ss
-        let mark s ts = case ts of
-              [] -> [MMacros.uTree] -- to leave a trace of unparsed line
-              _  -> ts
-        let a' = ATrms [t | (s,(_,ATrms ts)) <- zip ss mts, t <- mark s ts]
-        changeArg (const a') sa
-    | otherwise -> parse $ prCommandArg a
-   where 
-      parse x = do
-       warnDiscont opts
-       let p = optParseArgErrMsg opts gro x
-       case p of
-         Ok (ts,msg) 
-           | oElem (iOpt "fail") opts && null ts -> do
-                putStrLnFlush ("#FAIL:" +++ x) >> changeArg (const $ ATrms ts) sa
-           | oElem (iOpt "ambiguous") opts && length ts > 1 -> do
-                putStrLnFlush ("#AMBIGUOUS:" +++ x) >> changeArg (const $ ATrms ts) sa
-           | oElem (iOpt "prob") opts -> do
-                let probs = stateProbs gro 
-                let tps = rankByScore [(t,computeProbTree probs t) | t <- ts]
-                putStrLnFlush msg
-                mapM_ putStrLnFlush [show p | (t,p) <- tps]
-                changeArg (const $ ATrms (map fst tps)) sa
-           | otherwise -> putStrLnFlush msg >> changeArg (const $ ATrms ts) sa
-         Bad msg -> changeArg (const $ AError (msg +++ "input" +++ x)) sa
-
-  CTranslate il ol -> do
-    let a' = opST2CommandArg (optParseArgErr opts (sgr il)) a
-    returnArg (opTS2CommandArg (optLinearizeTreeVal opts (sgr ol)) a') sa
-
-  CGenerateRandom | oElem showCF opts || oElem (iOpt "prob") opts -> do
-    let probs = stateProbs gro 
-    let cat = firstAbsCat opts gro
-    let n = optIntOrN opts flagNumber 1
-    gen    <- newStdGen
-    let ts = take n $ generateRandomTreesProb opts gen cgr probs cat
-    returnArg (ATrms (map (term2tree gro) ts)) sa
-
-  CGenerateRandom -> do
-    let 
-      a' = case a of
-        ASTrm _ -> s2t a
-        AString _ -> s2t a
-        _ -> a
-    case a' of
-      ATrms (trm:_) -> case tree2exp trm of
-        G.EInt _ -> do
-          putStrLn "Warning: Number argument deprecated, use gr -number=n instead"
-          ts <- randomTreesIO opts gro (optIntOrN opts flagNumber 1)
-          returnArg (ATrms ts) sa
-        _ -> do
-            g    <- newStdGen
-            case (goFirstMeta (tree2loc trm) >>= refineRandom g 41 cgr) of
-              Ok trm' -> returnArg (ATrms [loc2tree trm']) sa
-              Bad s   -> returnArg (AError s) sa
-      _ -> do
-        ts <- randomTreesIO opts gro (optIntOrN opts flagNumber 1)
-        returnArg (ATrms ts) sa
-
-  CGenerateTrees | oElem showAll opts -> do
-    let 
-      cat = firstAbsCat opts gro
-      outp 
-       | oElem (iOpt "lin") opts = optLinearizeTreeVal opts gro . term2tree gro
-       | otherwise = prt_
-    justOutput opts (generateAll opts (putStrLn . outp) cgr cat) sa
-  CGenerateTrees -> do
-    let 
-      a' = case a of
-        ASTrm _ -> s2t a
-        AString _ -> s2t a
-        _ -> a
-      mt = case a' of
-        ATrms (tr:_) -> Just tr
-        _ -> Nothing
-    returnArg (ATrms $ generateTrees opts gro mt) sa
-
-  CTreeBank | oElem doCompute opts -> do -- -c
-    let bank = prCommandArg a
-    returnArg (AString $ unlines $ testMultiTreebank opts st bank) sa
-  CTreeBank | oElem getTrees opts -> do -- -trees
-    let bank  = prCommandArg a
-        tes   = map (string2treeErr gro) $ treesTreebank opts bank
-        terms = [t | Ok t <- tes] 
-    returnArg (ATrms terms) sa
-  CTreeBank -> do
-    let ts = strees $ s2t $ snd sa
-        comm = "command" ----
-    returnArg (AString $ unlines $ mkMultiTreebank opts st comm ts) sa
-
-  CLookupTreebank -> do
-    let tbs = treebanks st
-    let s   = prCommandArg a
-    if null tbs 
-      then returnArg (AError "no treebank") sa
-      else do
-        let tbi = maybe (fst $ head tbs) I.identC (getOptVal opts (aOpt "treebank"))
-        case lookup tbi tbs of
-          Nothing -> returnArg (AError ("no treebank" +++ prt tbi)) sa
-          Just tb -> case () of
-            _ | oElem (iOpt "strings") opts -> do
-              returnArg (AString $ unlines $ map fst $ assocsTreebank tb) sa
-            _ | oElem (iOpt "raw") opts -> do
-              returnArg (AString $ unlines $ lookupTreebank tb s) sa
-            _ | oElem (iOpt "assocs") opts -> do
-              returnArg (AString $ unlines $ map printAssoc $ assocsTreebank tb) sa
-            _ | oElem (iOpt "trees") opts -> do
-              returnArg (ATrms $ str2trees $ concatMap snd $ assocsTreebank tb) sa
-            _ -> do            
-              let tes = map (string2treeErr gro) $ lookupTreebank tb s
-                  terms = [t | Ok t <- tes]
-              returnArg (ATrms terms) sa
-
-  CShowTreeGraph | oElem emitCode opts -> do -- -o
-    returnArg (AString $ visualizeTrees opts $ strees $ s2t a) sa
-  CShowTreeGraph  -> do
-    let gv = if oElem (iOpt "mac") opts then "open" else "gv" ---- config!
-    let g0 = writeFile "grphtmp.dot" $ visualizeTrees opts $ strees $ s2t a
-        g1 = system "dot -Tps grphtmp.dot >grphtmp.ps" 
-        g2 = system (gv +++ "grphtmp.ps &") 
-        g3 = return () ---- system "rm -f grphtmp.*"
-    justOutput opts (g0 >> g1 >> g2 >> g3 >> return ()) sa
-
-  CPutTerm -> changeArg (opTT2CommandArg (return . optTermCommand opts gro) . s2t) sa
-
-  CWrapTerm f -> changeArg (opTT2CommandArg (return . return . wrapByFun opts gro f) . s2t) sa
-  CApplyTransfer f -> changeArg (opTT2CommandArg (applyTransfer opts gro transfs f) . s2t) sa
-  CMorphoAnalyse -> changeArg (AString . morphoAnalyse opts gro . prCommandArg) sa
-  CTestTokenizer -> changeArg (AString . optTokenizer opts gro . prCommandArg) sa
-
-  CComputeConcrete t -> do
-    let prin = if (oElem (iOpt "table") opts) then printParadigm else prt 
-    m <- return $
-         maybe (I.identC "?") id $  -- meaningful if no opers in t 
-           maybe (resourceOfShellState st) (return . I.identC) $ -- topmost res
-             getOptVal opts useResource             -- flag -res=m
-    returnArg (AString (err id (prin . stripTerm) (
-                string2srcTerm src m t >>= 
-                Ch.justCheckLTerm src  >>=
-                Co.computeConcrete src))) sa
----                Co.computeConcreteRec src)) sa
-  CShowOpers t -> do
-    m <- return $
-         maybe (I.identC "?") id $  -- meaningful if no opers in t 
-           maybe (resourceOfShellState st) (return . I.identC) $ -- topmost res
-             getOptVal opts useResource             -- flag -res=m
-    justOutput opts (putStrLn (err id (unlines . map prOperSignature) (
-                string2srcTerm src m t >>= (\t' -> 
-                Co.computeConcrete src t' >>=  (\v -> 
-                return (L.opersForType src t' v)))))) sa
-
-
-  CTranslationQuiz il ol -> do
-    warnDiscont opts 
-    justOutput opts (teachTranslation opts (sgr il) (sgr ol)) sa
-  CTranslationList il ol -> do
-    warnDiscont opts
-    let n = optIntOrN opts flagNumber 10 
-    qs <- transTrainList opts (sgr il) (sgr ol) (toInteger n)
-    let hdr = unlines ["# From: " ++ prIdent il,
-                       "# To: " ++ prIdent ol]
-    returnArg (AString $ hdr ++++ foldr (+++++) [] [unlines (s:ss) | (s,ss) <- qs]) sa
-
-  CMorphoQuiz -> do
-    warnDiscont opts 
-    justOutput opts (teachMorpho opts gro) sa
-  CMorphoList -> do
-    let n = optIntOrN opts flagNumber 10  
-    warnDiscont opts 
-    qs <- useIOE [] $ morphoTrainList opts gro (toInteger n)
-    returnArg (AString $ foldr (+++++) [] [unlines (s:ss) | (s,ss) <- qs]) sa
-
-  CReadFile file   -> returnArgIO   (readFileIf file >>= return . AString) sa
-  CWriteFile file  -> justOutputArg opts (writeFile file) sa
-  CAppendFile file -> justOutputArg opts (appendFile file) sa
-  CSpeakAloud      -> justOutputArg opts (speechGenerate opts) sa
-  CSpeechInput     -> returnArgIO (speechInput opts gro >>= return . AString . unlines) sa
-  CSystemCommand s -> case a of
-    AUnit -> justOutput opts (system s >> return ()) sa
-    _     -> systemArg  opts a s sa 
-  CPutString       -> changeArg    (opSS2CommandArg (optStringCommand opts gro)) sa
------  CShowTerm        -> changeArg  (opTS2CommandArg (optPrintTerm opts gro) . s2t) sa
-  CGrep ms -> changeArg (AString . unlines . filter (grep ms) . lines . prCommandArg) sa
-
-
-  CSetFlag           -> changeState (addGlobalOptions opts0) sa
----- deprec!  CSetLocalFlag lang -> changeState (addLocalOptions lang opts0) sa
-
-  CHelp (Just c) -> returnArg   (AString (txtHelpCommand c)) sa
-  CHelp _ -> case opts0 of
-    Opts [o] | o == showAll  -> returnArg   (AString txtHelpFile) sa
-    Opts [o] | o == showDefs -> returnArg   (AString (txtHelpMacros sh)) sa
-    Opts [o]        -> returnArg   (AString (txtHelpCommand ('-':prOpt o))) sa
-    _               -> returnArg   (AString txtHelpFileSummary) sa
-
-  CPrintGrammar       -> returnArg (AString (optPrintGrammar opts gro)) sa
-  CPrintGlobalOptions -> justOutput opts (putStrLn  $ prShellStateInfo st) sa
-  CPrintInformation c -> justOutput opts (useIOE () $ showInformation opts st c) sa
-  CPrintLanguages     -> justOutput opts 
-                         (putStrLn $ unwords $ map prLanguage $ allLanguages st) sa
-  CPrintMultiGrammar  -> do
-    let cgr' = canModules $ purgeShellState st
-    returnArg (AString (optPrintMultiGrammar opts cgr')) sa
-  CShowGrammarGraph  -> do
-    ---- sa' <- changeState purgeShellState sa
-    let gv = if oElem (iOpt "mac") opts then "open" else "gv" ---- config!
-    let g0 = writeFile "grphtmp.dot" $ visualizeCanonGrammar opts cgr
-        g1 = system "dot -Tps grphtmp.dot >grphtmp.ps" 
-        g2 = system (gv +++ "grphtmp.ps &") 
-        g3 = return () ---- system "rm -f grphtmp.*"
-    justOutput opts (g0 >> g1 >> g2 >> g3 >> return ()) sa
-  CPrintSourceGrammar -> 
-      returnArg (AString (visualizeSourceGrammar src)) sa
-
-----  CPrintGramlet       -> returnArg (AString (Gr.prGramlet st)) sa
-----  CPrintCanonXML      -> returnArg (AString (Canon.prCanonXML st False)) sa
-----  CPrintCanonXMLStruct -> returnArg (AString (Canon.prCanonXML st True)) sa
-  _ -> justOutput opts (putStrLn "command not understood") sa
-
- where
-   sgr = stateGrammarOfLang st
-   gro = grammarOfOptState opts st
-   opts = addOptions opts0 (globalOptions st)
-   src = srcModules st
-   cgr = canModules st
-
-   transfs = transfers st
-
-   s2t a = case a of
-     ASTrm ('$':c) -> maybe (AError "undefined term") (ATrms . return) $ lookupShTerm sh c
-     ASTrm s  -> err AError (ATrms . return) $ string2treeErr gro s
-     AString s  -> err AError (ATrms . return) $ string2treeErr gro s
-     _ -> a
-
-   str2trees ts = [t | Ok t <- map (string2treeErr gro) ts]
-
-   strees a = case a of
-     ATrms ts -> ts
-     _ -> [] 
-
-   warnDiscont os = err putStrLn id $ do
-     let c0 = firstAbsCat os gro
-     c <- GrammarToCanon.redQIdent c0
-     lang <- maybeErr "no concrete" $ languageOfOptState os st
-     t <- return $ errVal CMacros.defLinType $ Look.lookupLincat cgr $ CMacros.redirectIdent lang c
-     return $ if CMacros.isDiscontinuousCType t 
-       then (putStrLn ("Warning: discontinuous category" +++ prt_ c))
-       else (return ())
-
-   grep ms s = (if oElem invertGrep opts then not else id) $ grepv ms s --- -v
-   grepv ms s = case s of
-     _:cs -> isPrefixOf ms s || grepv ms cs
-     _ -> isPrefixOf ms s
-
--- commands either change the state or process the argument, but not both
--- some commands just do output
-
-changeState :: ShellStateOper -> ShellIO
-changeState f ((st,h),a) = return ((f st,h), a)
-
-changeStateErr :: ShellStateOperErr -> ShellIO
-changeStateErr f ((st,h),a) = case f st of
-  Ok st' -> return ((st',h), a)
-  Bad s  -> return ((st, h),AError s)
-
-changeArg :: (CommandArg -> CommandArg) -> ShellIO
-changeArg f (st,a) = return (st, f a)
-
-changeArgMsg :: (CommandArg -> (CommandArg,String)) -> ShellIO
-changeArgMsg f (st,a) = do
-  let (b,msg) = f a
-  putStrLnFlush msg
-  return (st, b)
-
-returnArg :: CommandArg -> ShellIO
-returnArg = changeArg . const
-
-returnArgIO :: IO CommandArg -> ShellIO
-returnArgIO io (st,_) = io >>= (\a -> return (st,a))
-
-justOutputArg :: Options -> (String -> IO ()) -> ShellIO
-justOutputArg opts f sa@(st,a) = f (utf (prCommandArg a)) >> return (st, AUnit) 
- where
-   utf = if (oElem useUTF8 opts) then encodeUTF8 else id
-
-justOutput :: Options -> IO () -> ShellIO
-justOutput opts = justOutputArg opts . const
-
-systemArg :: Options -> CommandArg -> String -> ShellIO
-systemArg _ cont syst sa = do
-  writeFile tmpi $ prCommandArg cont
-  system $ syst ++ " <" ++ tmpi ++ " >" ++ tmpo 
-  s <- readFile tmpo
-  returnArg (AString s) sa
- where
-   tmpi = "_tmpi" ---
-   tmpo = "_tmpo"
-
--- | type system for command arguments; instead of plain strings...
-data CommandArg = 
-   AError  String 
- | ATrms   [Tree] 
- | ASTrm   String   -- ^ to receive from parser 
- | AStrs   [Str] 
- | AString String 
- | AUnit 
-  deriving (Eq, Show)
-
-prCommandArg :: CommandArg -> String
-prCommandArg arg = case arg of
-  AError s   -> s
-  AStrs ss   -> sstrV ss
-  AString s  -> s
-  ATrms []   -> "no tree found"
-  ATrms tt   -> unlines $ map prt_Tree tt
-  ASTrm s    -> s
-  AUnit      -> ""
-
-opSS2CommandArg :: (String -> String) -> CommandArg -> CommandArg
-opSS2CommandArg f = AString . f . prCommandArg
-
-opST2CommandArg :: (String -> Err [Tree]) -> CommandArg -> CommandArg
-opST2CommandArg f = err AError ATrms . f . prCommandArg
-
-opTS2CommandArg :: (Tree -> String) -> CommandArg -> CommandArg
-opTS2CommandArg f (ATrms ts) = AString $ unlines $ map f ts
-opTS2CommandArg _ (AError s) = AError ("expected term, but got error:" ++++ s)
-opTS2CommandArg _ a = AError ("expected term, but got:" ++++ prCommandArg a)
-
-opTT2CommandArg :: (Tree -> Err [Tree]) -> CommandArg -> CommandArg
-opTT2CommandArg f (ATrms ts) = err AError (ATrms . concat) $ mapM f ts
-opTT2CommandArg _ (AError s) = AError ("expected term, but got error:" ++++ s)
-opTT2CommandArg _ a = AError ("expected term, but got:" ++++ prCommandArg a)
-
-opTTs2CommandArg :: ([Tree] -> [Tree]) -> CommandArg -> CommandArg
-opTTs2CommandArg f (ATrms ts) = ATrms $ f ts
-opTTs2CommandArg _ (AError s) = AError ("expected terms, but got error:" ++++ s)
-opTTs2CommandArg _ a = AError ("expected terms, but got:" ++++ prCommandArg a)
-