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processing a .tar.gz file
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| {-# LANGUAGE OverloadedStrings #-} | |
| -- build-depends: tar, bytestring, zlib | |
| -- Example of how to iterate through a .tar.gz file | |
| module Lib | |
| where | |
| import qualified Codec.Archive.Tar as Tar | |
| import Codec.Archive.Tar | |
| import qualified Data.ByteString.Lazy.Char8 as LBS | |
| import qualified Codec.Compression.GZip as GZip | |
| import Control.Monad | |
| import Data.Monoid | |
| import System.Environment | |
| import Data.List | |
| someFunc :: IO () | |
| someFunc = putStrLn "someFunc" | |
| test1 = do | |
| contents <- fmap GZip.decompress $ LBS.readFile "hoogle.tar.gz" | |
| let entries = Tar.read contents | |
| files = selectFiles entries | |
| forM_ files $ \entry-> do | |
| let ePath = entryPath entry | |
| NormalFile bytes size = entryContent entry | |
| -- putStrLn $ show size ++ " " ++ ePath | |
| processFile bytes | |
| return () | |
| selectFiles :: Entries FormatError -> [Entry] | |
| selectFiles Done = [] | |
| selectFiles (Fail e) = error $ "some format error: " ++ show e | |
| selectFiles (Next entry next) | |
| = case entryContent entry of | |
| NormalFile _ _ -> entry : selectFiles next | |
| _ -> selectFiles next | |
| processFile bytes = do | |
| let lns = LBS.lines bytes | |
| forM_ lns processLine | |
| processLine str | |
| | LBS.isPrefixOf "@package " str = emit | |
| | LBS.isPrefixOf "@version " str = emit | |
| | LBS.isPrefixOf "module " str = emit | |
| | otherwise = return () | |
| where emit = LBS.putStrLn str | |
| ---------- | |
| processTarArchive path = do | |
| contents <- fmap GZip.decompress $ LBS.readFile path | |
| let entries = Tar.read contents | |
| files = selectFiles entries | |
| forM_ files $ \entry-> do | |
| let ePath = entryPath entry | |
| NormalFile bytes size = entryContent entry | |
| -- putStrLn $ show size ++ " " ++ ePath | |
| processFile2 ("???", "???") (LBS.lines bytes) | |
| return () | |
| processTxtFile path = do | |
| contents <- LBS.readFile path | |
| processFile2 ("???", "???") (LBS.lines contents) | |
| processFile2 (package, version) [] = return () | |
| processFile2 (package, version) (a:as) = | |
| case LBS.words a of | |
| ("@package" : pkg : _) -> processFile2 (pkg, version) as | |
| ("@version" : vers : _) -> processFile2 (package, vers) as | |
| ("module" : mod : _) -> do LBS.putStrLn $ mod <> " " <> package <> " " <> version | |
| processFile2 (package, version) as | |
| _ -> processFile2 (package, version) as | |
| processArg path | |
| | isSuffixOf ".tar.gz" path = processTarArchive path | |
| | isSuffixOf ".txt" path = processTxtFile path | |
| | otherwise = error $ "unknown file type: " ++ path | |
| main = getArgs >>= mapM_ processArg |
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