2019-01-23 23:55:26 +03:00
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{-# LANGUAGE DerivingStrategies #-}
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{-# LANGUAGE GeneralizedNewtypeDeriving #-}
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{-# LANGUAGE LambdaCase #-}
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{-# LANGUAGE OverloadedStrings #-}
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2019-01-18 01:00:48 +03:00
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-- TODO: qualified imports
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-- TODO: format code
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import Control.Monad
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2019-01-23 23:55:26 +03:00
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import Data.Aeson
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import Data.Bifunctor
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import Data.HashMap.Strict as HMap
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import Data.Hashable (Hashable)
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2019-01-18 01:00:48 +03:00
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import Data.Semigroup ((<>))
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2019-01-23 23:55:26 +03:00
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import Options.Applicative
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2019-01-18 01:00:48 +03:00
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import System.Directory
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import System.FilePath
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2019-01-23 23:55:26 +03:00
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import qualified Data.ByteString as B
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import qualified Data.ByteString.Lazy as L
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import qualified Data.Text as T
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2019-01-18 01:00:48 +03:00
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fileFetchNix :: FilePath
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fileFetchNix = "nix" </> "fetch.nix"
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2019-01-23 23:55:26 +03:00
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-- TODO: file "nix/default.nix"
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2019-01-18 01:00:48 +03:00
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fileFetchNixContent :: String
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fileFetchNixContent = unlines
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[
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]
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fileVersionsJson :: FilePath
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fileVersionsJson = "nix" </> "versions.json"
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fileVersionsJsonContent :: String
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fileVersionsJsonContent = unlines
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[
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]
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getVersionsSpec :: IO VersionsSpec
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getVersionsSpec = do
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putStrLn $ "Reading versions file"
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decodeFileStrict fileVersionsJson >>= \case
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Just (Object v) ->
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fmap (VersionsSpec . mconcat) $
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forM (HMap.toList v) $ \(k, v) ->
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case v of
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Object v' ->
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pure $ HMap.singleton (PackageName (T.unpack k)) (PackageSpec v')
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_ -> error "baaaaz"
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Just _ -> error "foo"
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Nothing -> error "Cannot decode versions"
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newtype PackageName = PackageName { unPackageName :: String }
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deriving newtype (Eq, Hashable, FromJSONKey, ToJSONKey)
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newtype PackageSpec = PackageSpec { unPackageSpec :: Object }
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deriving newtype (FromJSON, ToJSON)
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newtype VersionsSpec = VersionsSpec
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{ unVersionsSpec :: HMap.HashMap PackageName PackageSpec }
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deriving newtype (FromJSON, ToJSON)
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parsePackageName :: Parser PackageName
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parsePackageName = undefined
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preparePackageURL :: PackageSpec -> IO String
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preparePackageURL = const $ pure "foo"
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-------------------------------------------------------------------------------
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-- INIT
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-------------------------------------------------------------------------------
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parseCmdInit :: ParserInfo (IO ())
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parseCmdInit = (info (pure cmdInit <**> helper)) fullDesc
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cmdInit :: IO ()
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cmdInit = do
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putStrLn "Creating directory nix (if it doesn't exist)"
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createDirectoryIfMissing True "nix"
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putStrLn $ "Creating file " <> fileFetchNix <> " (if it doesn't exist)"
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fileFetchNixExists <- doesFileExist fileFetchNix
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if fileFetchNixExists
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then do
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putStrLn $ "Not writing " <> fileFetchNix
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putStrLn "(file exists)"
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else do
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putStrLn $ "Writing " <> fileFetchNix
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writeFile fileFetchNix fileFetchNixContent
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putStrLn $ "Creating file " <> fileVersionsJson <> " (if it doesn't exist)"
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fileVersionsJsonExists <- doesFileExist fileVersionsJson
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if fileVersionsJsonExists
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then do
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putStrLn $ "Not writing " <> fileVersionsJson
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putStrLn "(file exists)"
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else do
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putStrLn $ "Writing " <> fileVersionsJson
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writeFile fileVersionsJson fileVersionsJsonContent
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2019-01-23 23:55:26 +03:00
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-------------------------------------------------------------------------------
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-- ADD
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-------------------------------------------------------------------------------
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cmdAdd :: PackageName -> IO ()
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cmdAdd packageName = do
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putStrLn $ "Adding " <> unPackageName packageName
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VersionsSpec versionsSpec <- getVersionsSpec
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-- TODO: new package Spec
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let fileVersionsValue' = versionsSpec <> HMap.empty
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putStrLn $ "Writing new versions file"
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encodeFile fileVersionsJson fileVersionsValue'
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-------------------------------------------------------------------------------
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-- SHOW
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-------------------------------------------------------------------------------
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cmdShow :: IO ()
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cmdShow = do
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putStrLn $ "Showing versions file"
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VersionsSpec fileVersionsValue <- getVersionsSpec
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forWithKeyM_ fileVersionsValue $ \key (PackageSpec spec) -> do
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putStrLn $ "Package: " <> unPackageName key
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forM_ (HMap.toList spec) $ \(attrName, attrValValue) -> do
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let attrValue = case attrValValue of
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String str -> str
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_ -> "<barabajagal>"
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putStrLn $ " " <> T.unpack attrName <> ": " <> T.unpack attrValue
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-------------------------------------------------------------------------------
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-- UPDATE
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-------------------------------------------------------------------------------
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cmdUpdate :: IO ()
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cmdUpdate = do
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putStrLn $ "Updating versions file"
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VersionsSpec fileVersionsValue <- getVersionsSpec
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fileVersionsValue' <- forWithKeyM fileVersionsValue $ \key spec -> do
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putStrLn $ "Package: " <> unPackageName key
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packageUrl <- preparePackageURL spec
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putStrLn $ " URL: " <> packageUrl
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sha256 <- nixPrefetchURL packageUrl
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putStrLn $ " SHA256: " <> sha256
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putStrLn $ "Writing new versions file"
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encodeFile fileVersionsJson fileVersionsValue'
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2019-01-18 01:00:48 +03:00
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parseCommand :: Parser (IO ())
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parseCommand = subparser (
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command "init" parseCmdInit <>
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command "add" (info (cmdAdd <$> parsePackageName) idm) <>
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command "show" (info (pure cmdShow) idm) <>
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command "update" (info (pure cmdUpdate) idm) )
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main :: IO ()
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main = join $ execParser opts
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where
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opts = info (parseCommand <**> helper)
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( fullDesc
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<> header "NIV - Nix Version manager" )
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nixPrefetchURL :: String -> IO String
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nixPrefetchURL = pure
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-------------------------------------------------------------------------------
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-- Aux
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-------------------------------------------------------------------------------
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--- Aeson
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-- | Efficiently deserialize a JSON value from a file.
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-- If this fails due to incomplete or invalid input, 'Nothing' is
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-- returned.
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--
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-- The input file's content must consist solely of a JSON document,
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-- with no trailing data except for whitespace.
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--
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-- This function parses immediately, but defers conversion. See
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-- 'json' for details.
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decodeFileStrict :: (FromJSON a) => FilePath -> IO (Maybe a)
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decodeFileStrict = fmap decodeStrict . B.readFile
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-- | Efficiently serialize a JSON value as a lazy 'L.ByteString' and write it to a file.
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encodeFile :: (ToJSON a) => FilePath -> a -> IO ()
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encodeFile fp = L.writeFile fp . encode
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--- HashMap
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forWithKeyM
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:: (Eq k, Hashable k, Monad m)
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=> HMap.HashMap k v1
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-> (k -> v1 -> m v2)
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-> m (HMap.HashMap k v2)
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forWithKeyM = flip mapWithKeyM
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forWithKeyM_
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:: (Eq k, Hashable k, Monad m)
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=> HMap.HashMap k v1
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-> (k -> v1 -> m ())
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-> m ()
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forWithKeyM_ = flip mapWithKeyM_
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mapWithKeyM
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:: (Eq k, Hashable k, Monad m)
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=> (k -> v1 -> m v2)
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-> HMap.HashMap k v1
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-> m (HMap.HashMap k v2)
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mapWithKeyM f m = do
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fmap mconcat $ forM (HMap.toList m) $ \(k, v) ->
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HMap.singleton k <$> f k v
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mapWithKeyM_
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:: (Eq k, Hashable k, Monad m)
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=> (k -> v1 -> m ())
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-> HMap.HashMap k v1
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-> m ()
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mapWithKeyM_ f m = do
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forM_ (HMap.toList m) $ \(k, v) ->
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HMap.singleton k <$> f k v
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