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If your program is a subroutine library, you +may consider it more useful to permit linking proprietary applications with +the library. If this is what you want to do, use the GNU Lesser General +Public License instead of this License. But first, please read +. diff --git a/Setup.hs b/Setup.hs new file mode 100644 --- /dev/null +++ b/Setup.hs @@ -0,0 +1,2 @@ +import Distribution.Simple +main = defaultMain diff --git a/only.cabal b/only.cabal new file mode 100644 --- /dev/null +++ b/only.cabal @@ -0,0 +1,24 @@ +Cabal-version: >= 1.2.0.0 +version: 0.0.3.0 + +name: only +license: GPL +license-file: LICENSE +author: Andrew Robbins +maintainer: Andrew Robbins +copyright: 2008 Andrew Robbins +category: tools +build-type: Simple +stability: experimental +synopsis: A grep-like tool for filtering on words or lines. +description: The 'only' command-line tool lets you search based + on word patterns or line patterns like never before! Not only can + you search with 'only -l patt' but you can select the n-th match + with '-l n\/patt\/' and the next 3 lines with '-l \/patt\/0:3'. + +executable only + main-is: only.hs + build-depends: + base, + parsec, + regex-compat diff --git a/only.hs b/only.hs new file mode 100644 --- /dev/null +++ b/only.hs @@ -0,0 +1,345 @@ +-- ---------------------------------------------------------------- +-- | +-- Executable : 'only' +-- Copyright : (C) 2008 Andrew Robbins +-- Maintainer : Andrew Robbins +-- Stability : experimental +-- Portability : portable +-- Description : Tool for comprehensive grep'ing +-- +module Main where + +import Control.Monad (when, unless) +import Data.IORef +import Data.Maybe +import System.Console.GetOpt +import System.Environment (getArgs) +import System.Exit +import System.IO +import System.IO.Unsafe +import Text.ParserCombinators.Parsec +import Text.Regex +import qualified Data.Foldable as Fold + +-- global stuff +progName = "only" + +-- usage stuff +version = "only (GNU Only) 0.0.3.0\n" + +header = unlines [ + version, + "Usage:\n", + " only -w EXPR FILES... Print words matching EXPR", + " only -l EXPR FILES... Print lines matching EXPR", + " only -l EXPR -w WORD FILES... Print words matching WORD from lines matching EXPR", + "\nOptions:"] + +footer = unlines [ + "\nExpressions:\n", + " The matching expressions [EXPR] are one of:", + "\tNUMBER Token (word/line) selection", + "\t/REGEX/NUMBER Token (word/line) relative to match (0-based, +/-)", + "\tNUMBER/REGEX/ Select which matches to print (1-based, +)", + "\tNUMBER/REGEX/NUMBER Both", "", + " where [NUMBER] is one of:", + "\tAT One", + "\tFROM:TO Range", + "\tFROM:TO;STEP Range with step", + "\tFROM;NEXT:TO Range with implicit step", + "\tL,I,S,T,I,N,G Explicit listing"] +{- +manpage = unlines [ + "\t/[REGEX]/=/[TEMPLATE]/"] + "\tAlthough this utility is very similar to 'grep' or 'sed'", + "in functionality, the '-A' and '-B' options are missing.", + "However, the same functionality exists with the EXPR field,", + "because '/patt/0:3' means -A3 and '/patt/-3:0' means -B3.", + "", + "[REGEX] is an Extended Regular Expression", + "", +-} +options = + [ Option ['h', '?'] ["help"] (NoArg ('h', "")) "Help and usage" +-- , Option ['H'] ["help-man"] (NoArg ('H', "")) "Manpage and documentation" +-- , Option ['F'] ["filenames"] (NoArg ('F', "")) "Print filenames" -- not implemented + , Option ['V'] ["version"] (NoArg ('V', "")) "Verison number" +-- , Option ['v'] ["invert"] (NoArg ('v', "")) "Invert match" -- not implemented +-- , Option ['i'] ["insensitive"] (NoArg ('i', "")) "Case insensitive" -- not implemented +-- , Option ['r'] ["recursive"] (NoArg ('r', "")) "Recursive descent" -- not implemented +-- , Option ['N'] ["negative"] (NoArg ('N', "")) "Default to - (+ to override, like tail)" -- not implemented +-- , Option ['s'] ["sort"] (NoArg ('s', "")) "Sort all indices before processing" -- not implemented +-- , Option ['t'] ["type"] (ReqArg (\x -> ('t', x)) "NAME") "Custom expression type" +-- , Option ['b'] ["bits"] (ReqArg (\x -> ('b', x)) "EXPR") "Bit expression" +-- , Option ['B'] ["bytes"] (ReqArg (\x -> ('B', x)) "EXPR") "Byte expression" +-- , Option ['c'] ["chars"] (ReqArg (\x -> ('c', x)) "EXPR") "Character expression" + , Option ['w'] ["words"] (ReqArg (\x -> ('w', x)) "EXPR") "Word expression" + , Option ['l'] ["lines"] (ReqArg (\x -> ('l', x)) "EXPR") "Line expression"] +-- , Option ['f'] ["files"] (ReqArg (\x -> ('f', x)) "EXPR") "File expression" +-- , Option ['m'] ["match"] (ReqArg (\x -> ('m', x)) "EXPR") +-- "Matching expression (see manpage for more)" + +-- data stuff +type Match = (Int, String) + +data OnlyExpr = OnlyExpr { + oeAbs :: [Int], + oePat :: String, + oeRel :: [Int]} deriving (Read, Show, Eq) + +data OnlyCtx = OnlyLeaf | OnlyCtx { + ocValue :: String, + ocParts :: [OnlyCtx]} deriving (Read, Show, Eq) + +data OnlyMode = NoMode + | FileMode + | ByteMode String + | CharMode String + | WordMode String + | LineMode String + deriving (Read, Show, Eq) + +initCtx :: String -> OnlyCtx +initCtx s = OnlyCtx s [OnlyLeaf] + +showCtx ctx = do + putStrLn "---" + print ctx + +-- parser stuff +parseDigits :: CharParser () [Int] +parseDigits = do + lists <- sepBy + ((try nexts) <|> + (try steps) <|> + (try range) <|> number) + (char ',' >> return []) + return (concat lists) + where digits :: CharParser () Int + digits = do + -- this is where to implement '--negative' behaviour + sign <- option "" (char '-' >> return "-") + num <- many1 digit + return (read $ sign ++ num) + number :: CharParser () [Int] + number = do + num <- digits + return [num] + range :: CharParser () [Int] + range = do + start <- digits + char ':' + end <- digits + return [start .. end] + steps :: CharParser () [Int] + steps = do + start <- digits + char ':' + end <- digits + char ';' + step <- digits + return [start, (start + step) .. end] + nexts :: CharParser () [Int] + nexts = do + start <- digits + char ';' + next <- digits + char ':' + end <- digits + return [start, next .. end] + +parseRegex :: CharParser () OnlyExpr +parseRegex = (try regex) <|> (try number) <|> word + where word = do + str <- many anyChar + return (OnlyExpr [] str []) + number = do + abs <- parseDigits + if abs == [] then word + else return (OnlyExpr abs "hello" []) + regex = do + abs <- parseDigits + ch <- noneOf $ ".,:;" ++ ['A'..'Z'] ++ ['a'..'z'] + pat <- many $ noneOf [ch] + char ch + rel <- parseDigits + return (OnlyExpr abs pat rel) + +readRegex :: FilePath -> String -> IO OnlyExpr +readRegex path expr = + if expr == "" + then return (OnlyExpr [] "" []) + else case parse parseRegex path expr of + Left err -> ioError$userError (show err) + Right oe -> return oe + +-- mode stuff + +{-# NOINLINE modesRef #-} +{-# NOINLINE modesMod #-} +{-# NOINLINE modesSet #-} +{-# NOINLINE modesGet #-} +{-# NOINLINE modeAdd #-} +modesRef :: IORef [OnlyMode] +modesRef = unsafePerformIO (newIORef []) +modesMod :: ([OnlyMode] -> [OnlyMode]) -> IO () +modesMod = modifyIORef modesRef +modesSet :: [OnlyMode] -> IO () +modesSet = writeIORef modesRef +modesGet :: IO [OnlyMode] +modesGet = readIORef modesRef +modeAdd :: OnlyMode -> IO () +modeAdd x = modifyIORef modesRef (++ [x]) + +-- file stuff + +{-# NOINLINE filesRef #-} +{-# NOINLINE filesGet #-} +{-# NOINLINE fileAdd #-} +filesRef :: IORef [FilePath] +filesRef = unsafePerformIO (newIORef []) +filesGet :: IO [FilePath] +filesGet = readIORef filesRef +fileAdd :: FilePath -> IO () +fileAdd x = modifyIORef filesRef (++ [x]) + +{-# NOINLINE fileRef #-} +{-# NOINLINE fileSet #-} +{-# NOINLINE fileGet #-} +fileRef :: IORef FilePath +fileRef = unsafePerformIO (newIORef "") +fileSet :: FilePath -> IO () +fileSet = writeIORef fileRef +fileGet :: IO FilePath +fileGet = readIORef fileRef + +-- exit stuff +exitStr e s = do putStr s ; exitWith e +showVersion = exitStr ExitSuccess version +help = exitStr ExitSuccess (usageInfo header options ++ footer) +--helpMan = exitStr ExitSuccess manpage +helpExit msg = putStrLn msg >> help >> return ([], []) +notImpl = exitStr ExitSuccess "not implemented" + +-- option stuff +processOpt :: (Char, String) -> IO () +processOpt (key, value) = + case key of + 'h' -> help + 'V' -> showVersion +-- 'H' -> helpMan +-- 'b' -> modeAdd $ ByteMode value +-- 'c' -> modeAdd $ CharMode value + 'w' -> modeAdd $ WordMode value + 'l' -> modeAdd $ LineMode value + +-- +-- main logic stuff +-- + +doFile :: [OnlyMode] -> FilePath -> IO OnlyCtx +doFile [] "-" = getContents >>= (return . initCtx) +doFile [] path = readFile path >>= (return . initCtx) +doFile modes path = do + fileSet path + ctx <- doFile [] path + ctx <- Fold.foldlM doMode ctx modes + ctx <- Fold.foldrM unMode ctx modes + putStr (ocValue ctx) + return ctx + +doMode :: OnlyCtx -> OnlyMode -> IO OnlyCtx +doMode context mode = + case context of + OnlyCtx _ [OnlyLeaf] -> + case mode of + WordMode expr -> doSep words expr context mode + LineMode expr -> doSep lines expr context mode + FileMode -> return context + OnlyCtx _ ctxs -> do + ctxs' <- mapM (\ctx -> doMode (initCtx (ocValue ctx)) mode) ctxs + return (context {ocParts = ctxs'}) + +doSep :: (String -> [String]) -> String -> OnlyCtx -> OnlyMode -> IO OnlyCtx +doSep sep expr ctx@(OnlyCtx orig _) mode = do + path <- fileGet + oe@(OnlyExpr abs pat rel) <- readRegex path expr + + let abs2ls :: [Match] -> Int -> Match + abs2ls ms n = getIndex ms n (-1, "") + rel2ls :: [Match] -> [Match] -> Match -> Int -> Match + rel2ls fs as (na, _) nr = tupleLookup n fs where n = na + nr + tupleLookup n xs = (n, (fromMaybe "")$lookup n xs) + + let seps = sep orig + some = doMatch oe full + full = map (\n -> (n, getIndex seps n "")) [1..length seps] + abss = [abs2ls some a | + a <- (if abs == [] then [1..length some] else abs)] + rels = [rel2ls full abss a r | + r <- (if rel == [] then [0] else rel), a <- abss] + parts = map (initCtx . snd) rels + + return (ctx {ocParts = parts}) + +doMatch :: OnlyExpr -> [Match] -> [Match] +doMatch oe = if pat == "" then id + else filter (isJust . (matchRegex re) . snd) + where noJust (Just []) = False + noJust (Just _) = True + noJust Nothing = False + pat = oePat oe + re = mkRegex pat + +unMode :: OnlyMode -> OnlyCtx -> IO OnlyCtx +unMode mode ctx@(OnlyCtx _ [OnlyLeaf]) = return ctx +unMode mode context = do + let parts = ocParts context + (if leaf parts then simplify else recurse) mode context + where + leaf ps = all (\c -> ocParts c == [OnlyLeaf]) ps + recurse mode context = do + parts <- mapM (unMode mode) (ocParts context) + return (context {ocParts = parts}) + simplify mode context = + case mode of + WordMode _ -> unSep unwords context + LineMode _ -> unSep unlines context + _ -> return context + +unSep :: ([String] -> String) -> OnlyCtx -> IO OnlyCtx +unSep unsep context = return $ context {ocParts = [OnlyLeaf], + ocValue = unsep $ map ocValue (ocParts context)} + +getIndex :: [a] -> Int -> a -> a +getIndex xs n nil = if n < 1 + then xs !! ((length xs) - n) + else if n > (length xs) + then nil + else xs !! (n - 1) + +main :: IO () +main = do + -- get arguments + args <- getArgs + let optErrs = getOpt Permute options args + (opts, nonOpts) <- case optErrs of + ([], [], _) -> helpExit "No arguments!" + (op, n, []) -> return (op, n) + (_, _, err) -> ioError$userError (concat err) + + -- process options + mapM processOpt opts + mapM fileAdd nonOpts + + -- handle some edge cases + when (nonOpts == []) $ helpExit "No files!" >> return () + when (opts == []) $ modeAdd (LineMode "") + + -- do the tasks + fileList <- filesGet + modeList <- modesGet + contexts <- mapM (doFile modeList) fileList + + -- possibly more + return ()