module Codex (Codex(..), Verbosity, module Codex) where
import Control.Exception (try, SomeException)
import Control.Monad
import Control.Monad.IO.Class
import Control.Monad.Trans.Either
import Data.Hash.MD5
import Data.Traversable (traverse)
import Data.String.Utils
import Distribution.Package
import Distribution.PackageDescription
import Distribution.Text
import Distribution.Verbosity
import Network.Curl.Download.Lazy
import System.Directory
import System.FilePath
import System.Process
import qualified Codec.Archive.Tar as Tar
import qualified Codec.Compression.GZip as GZip
import qualified Data.ByteString.Lazy as BS
import qualified Data.List as List
import qualified Data.Text as Text
import qualified Data.Text.Lazy as TextL
import qualified Data.Text.Lazy.IO as TLIO
import Codex.Internal
data Tagging = Tagged | Untagged
deriving (Eq, Show)
fromBool :: Bool -> Tagging
fromBool True = Tagged
fromBool False = Untagged
data Status = Source Tagging | Archive | Remote
deriving (Eq, Show)
type Action = EitherT String IO
data Tagger = Ctags | Hasktags
deriving (Eq, Show, Read)
taggerCmd :: Tagger -> String
taggerCmd Ctags = "ctags --tag-relative=no --recurse -f '$TAGS' '$SOURCES'"
taggerCmd Hasktags = "hasktags --ctags --output='$TAGS' '$SOURCES'"
tryIO :: IO a -> Action a
tryIO io = do
res <- liftIO $ (try :: IO a -> IO (Either SomeException a)) io
either (left . show) return res
dependenciesHash :: [PackageIdentifier] -> String
dependenciesHash xs = md5s . Str $ xs >>= display
isUpdateRequired :: FilePath -> [PackageIdentifier] -> Action Bool
isUpdateRequired file is = do
fileExist <- tryIO $ doesFileExist file
if fileExist then do
content <- tryIO $ TLIO.readFile file
let hash = TextL.toStrict . TextL.drop 13 . head . drop 2 $ TextL.lines content
return $ hash /= (Text.pack $ dependenciesHash is)
else
return True
status :: Codex -> PackageIdentifier -> Action Status
status cx i = do
sourcesExist <- tryIO . doesDirectoryExist $ packageSources cx i
archiveExist <- tryIO . doesFileExist $ packageArchive cx i
case (sourcesExist, archiveExist) of
(True, _) -> fmap (Source . fromBool) (liftIO . doesFileExist $ packageTags cx i)
(_, True) -> return Archive
(_, _) -> return Remote
fetch :: Codex -> PackageIdentifier -> Action FilePath
fetch cx i = do
bs <- tryIO $ do
createDirectoryIfMissing True (packagePath cx i)
openLazyURI url
either left write bs where
write bs = fmap (const archivePath) $ tryIO $ BS.writeFile archivePath bs
archivePath = packageArchive cx i
url = packageUrl i
extract :: Codex -> PackageIdentifier -> Action FilePath
extract cx i = fmap (const path) . tryIO $ read path (packageArchive cx i) where
read dir tar = Tar.unpack dir . Tar.read . GZip.decompress =<< BS.readFile tar
path = packagePath cx i
tags :: Codex -> PackageIdentifier -> Action FilePath
tags cx i = do
tryIO . createProcess $ shell command
return tags where
sources = packageSources cx i
tags = packageTags cx i
command = replace "$SOURCES" sources $ replace "$TAGS" tags $ tagsCmd cx
assembly :: Codex -> [PackageIdentifier] -> FilePath -> Action FilePath
assembly cx is o = tryIO . fmap (const o) $ mergeTags (fmap tags is) o where
mergeTags files o = do
contents <- traverse TLIO.readFile files
let xs = List.sort . concat $ fmap TextL.lines contents
TLIO.writeFile o $ TextL.unlines (concat [headers, xs])
tags i = packageTags cx i
headers :: [TextL.Text]
headers = fmap TextL.pack ["!_TAG_FILE_FORMAT 2", "!_TAG_FILE_SORTED 1", hash]
hash = concat ["!_CODEX_HASH ", dependenciesHash is]