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-{-# LANGUAGE TemplateHaskell #-}
-{-# LANGUAGE GeneralizedNewtypeDeriving #-}
-{-# LANGUAGE DeriveDataTypeable #-}
-{-# LANGUAGE TypeFamilies #-}
-{-# OPTIONS_GHC -fno-warn-orphans #-}
-
--- | Keep is a database built on Data.Acid.
---
--- If this proves useful, maybe we could make it a more general thing. Like
--- `Biz.Keep`. I could wrap all the safecopy stuff in my own template haskell
--- like `$(keep ''MyType)`.
---
-module Com.InfluencedByBooks.Keep where
-
-import Com.InfluencedByBooks.Core (Person(..), Book(..))
-import qualified Com.InfluencedByBooks.Influencers as Influencers
-import Control.Monad.Reader (ask)
-import Control.Monad.State (get, put)
-import Data.Acid (Update, makeAcidic)
-import qualified Data.Acid as Acid
-import Data.Data (Data, Typeable)
-import Data.IxSet (Indexable(..), IxSet, ixFun, ixSet)
-import qualified Data.IxSet as IxSet
-import Data.SafeCopy
-import Data.Text (Text)
-import qualified Data.Text as Text
-
--- * Keep
-
--- | Main database. Need to think of a better name for this.
-data IbbKeep = IbbKeep
- { _people :: IxSet Person
- }
- deriving (Data, Typeable)
-
-$(deriveSafeCopy 0 'base ''IbbKeep)
-
--- * Index @Person@
-
-$(deriveSafeCopy 0 'base ''Person)
-
-newtype PersonName =
- PersonName Text deriving (Eq, Ord, Data, Typeable)
-
-newtype PersonBlurb =
- PersonBlurb Text deriving (Eq, Ord, Data, Typeable)
-
-instance Indexable Person where
- empty = ixSet
- [ ixFun $ \p -> [ PersonName $ _name p ]
- , ixFun $ \p -> [ _pic p ]
- , ixFun $ \p -> [ _twitter p ]
- , ixFun $ \p -> [ _website p ]
- , ixFun $ \p -> [ _books p ]
- , ixFun $ \p -> [ PersonBlurb $ _blurb p ]
- ]
-
--- | updates the `IbbKeep` with a new `Person`
-newPerson :: Text -> Text -> Update IbbKeep Person
-newPerson name blurb = do
- k <- get
- put $ k { _people = IxSet.insert p (_people k)
- }
- return p
- where
- p = Person
- { _name = name
- , _pic = Text.empty
- , _twitter = Text.empty
- , _website = Text.empty
- , _books = []
- , _blurb = blurb
- }
-
-getPeople :: Int -> Acid.Query IbbKeep [Person]
-getPeople n = do
- keep <- ask
- return $ take n $ IxSet.toList $ _people keep
-
--- * Index @Book@
-
-$(deriveSafeCopy 0 'base ''Book)
-
-newtype BookTitle =
- BookTitle Text deriving (Eq, Ord, Data, Typeable)
-
-newtype BookAuthor =
- BookAuthor Text deriving (Eq, Ord, Data, Typeable)
-
-instance Indexable Book where
- empty = ixSet
- [ ixFun $ \b -> [ BookTitle $ _title b ]
- , ixFun $ \b -> [ BookAuthor $ _author b ]
- , ixFun $ \b -> [ _amznref b ]
- ]
-
--- | updates the `IbbKeep` with a new `Book`
---newBook :: Text -> Text -> Text -> Update IbbKeep Book
---newBook title author amznref = do
--- ibbKeep <- get
--- put $ ibbKeep { _books = IxSet.insert b (_books ibbKeep)
--- , _people = _people ibbKeep
--- }
--- return b
--- where
--- b = Book { _title = title
--- , _author = author
--- , _amznref = amznref
--- }
-
--- * Opening the keep
-
--- defines @NewPerson@ for us.
-$(makeAcidic ''IbbKeep ['newPerson, 'getPeople])
-
-initialIbbKeep :: IbbKeep
-initialIbbKeep = IbbKeep
- { _people = IxSet.fromList Influencers.allPeople
- }
-
-openLocal :: String -> IO (Acid.AcidState IbbKeep)
-openLocal dir =
- Acid.openLocalStateFrom dir initialIbbKeep