{-# LANGUAGE OverloadedStrings #-}
-- | Exposed for testing, do not use!

module Pantry.Internal
  ( parseTree
  , renderTree
  , Tree (..)
  , TreeEntry (..)
  , FileType(..)
  , mkSafeFilePath
  , pcHpackExecutable
  , normalizeParents
  , makeTarRelative
  , getGlobalHintsFile
  , hpackVersion
  , Storage
  , initStorage
  , withStorage_
  ) where

import Control.Exception (assert)
import Pantry.Types
import Pantry.SQLite (initStorage)
import Pantry.HPack (hpackVersion)
import qualified Data.Text as T
import Data.Maybe (fromMaybe)

-- | Like @System.FilePath.normalise@, however:

--

-- * Only works on relative paths, absolute paths fail

--

-- * Strips trailing slashes

--

-- * Only works on forward slashes, even on Windows

--

-- * Normalizes parent dirs @foo/../@ get stripped

--

-- * Cannot begin with a parent directory (@../@)

--

-- * Spelled like an American, sorry

normalizeParents
  :: FilePath
  -> Either String FilePath
normalizeParents :: String -> Either String String
normalizeParents String
"" = forall a b. a -> Either a b
Left String
"empty file path"
normalizeParents (Char
'/':String
_) = forall a b. a -> Either a b
Left String
"absolute path"
normalizeParents (Char
'.':Char
'.':Char
'/':String
_) = forall a b. a -> Either a b
Left String
"absolute path"
normalizeParents String
fp = do
  -- Strip a single trailing, but not multiple

  let t0 :: Text
t0 = String -> Text
T.pack String
fp
      t :: Text
t = forall a. a -> Maybe a -> a
fromMaybe Text
t0 forall a b. (a -> b) -> a -> b
$ Text -> Text -> Maybe Text
T.stripSuffix Text
"/" Text
t0
  case Text -> Maybe (Text, Char)
T.unsnoc Text
t of
    Just (Text
_, Char
'/') -> forall a b. a -> Either a b
Left String
"multiple trailing slashes"
    Maybe (Text, Char)
_ -> forall a b. b -> Either a b
Right ()

  let c1 :: [Text]
c1 = (Char -> Bool) -> Text -> [Text]
T.split (forall a. Eq a => a -> a -> Bool
== Char
'/') Text
t

  case forall a. [a] -> [a]
reverse [Text]
c1 of
    Text
".":[Text]
_ -> forall a b. a -> Either a b
Left String
"last component is a single dot"
    [Text]
_ -> forall a b. b -> Either a b
Right ()

  let c2 :: [Text]
c2 = forall a. (a -> Bool) -> [a] -> [a]
filter (\Text
x -> Bool -> Bool
not (Text -> Bool
T.null Text
x Bool -> Bool -> Bool
|| Text
x forall a. Eq a => a -> a -> Bool
== Text
".")) [Text]
c1

  let loop :: [a] -> [a] -> [a]
loop [] [a]
routput = forall a. [a] -> [a]
reverse [a]
routput
      loop (a
"..":[a]
rest) (a
_:[a]
routput) = [a] -> [a] -> [a]
loop [a]
rest [a]
routput
      loop (a
x:[a]
xs) [a]
routput = [a] -> [a] -> [a]
loop [a]
xs (a
xforall a. a -> [a] -> [a]
:[a]
routput)

  case forall {a}. (Eq a, IsString a) => [a] -> [a] -> [a]
loop [Text]
c2 [] of
    [] -> forall a b. a -> Either a b
Left String
"no non-empty components"
    [Text]
c' -> forall a b. b -> Either a b
Right forall a b. (a -> b) -> a -> b
$ Text -> String
T.unpack forall a b. (a -> b) -> a -> b
$ Text -> [Text] -> Text
T.intercalate Text
"/" [Text]
c'

-- | Following tar file rules (Unix file paths only), make the second

-- file relative to the first file.

makeTarRelative
  :: FilePath -- ^ base file

  -> FilePath -- ^ relative part

  -> Either String FilePath
makeTarRelative :: String -> String -> Either String String
makeTarRelative String
_ (Char
'/':String
_) = forall a b. a -> Either a b
Left String
"absolute path found"
makeTarRelative String
base String
rel =
  case forall a. [a] -> [a]
reverse String
base of
    [] -> forall a b. a -> Either a b
Left String
"cannot have empty base"
    Char
'/':String
_ -> forall a b. a -> Either a b
Left String
"base cannot be a directory"
    Char
_:String
rest -> forall a b. b -> Either a b
Right forall a b. (a -> b) -> a -> b
$
      case forall a. (a -> Bool) -> [a] -> [a]
dropWhile (forall a. Eq a => a -> a -> Bool
/= Char
'/') String
rest of
        Char
'/':String
rest' -> forall a. [a] -> [a]
reverse String
rest' forall a. [a] -> [a] -> [a]
++ Char
'/' forall a. a -> [a] -> [a]
: String
rel
        String
rest' -> forall a. (?callStack::CallStack) => Bool -> a -> a
assert (forall (t :: * -> *) a. Foldable t => t a -> Bool
null String
rest') String
rel