hablo/src/JSON.hs

75 lines
2.3 KiB
Haskell

{-# LANGUAGE DeriveGeneric #-}
{-# LANGUAGE NamedFieldPuns #-}
module JSON (
exportBlog
) where
import Article (Article)
import qualified Article (Article(..))
import Blog (Blog)
import qualified Blog (Blog(..), Skin(..))
import Control.Monad.Reader (ReaderT, ask)
import Data.Aeson (ToJSON(..), genericToEncoding, defaultOptions, encode)
import Data.ByteString.Lazy (ByteString)
import Data.Map (Map, (!), foldlWithKey, mapKeys, mapWithKey)
import qualified Data.Map as Map (empty, filter, insert, keys)
import qualified Data.Set as Set (elems, member)
import System.FilePath.Posix ((</>), (<.>))
import System.Posix.Files (modificationTime)
import System.Posix.Types (EpochTime, FileID)
import GHC.Generics
type ArticleID = Int
data ArticleExport = ArticleExport {
source :: String
, title :: String
, metadata :: Map String String
, tagged :: [String]
} deriving (Generic)
instance ToJSON ArticleExport where
toEncoding = genericToEncoding defaultOptions
data SkinExport = SkinExport {
previewArticlesCount :: Int
, previewLinesCount :: Int
} deriving (Generic)
instance ToJSON SkinExport where
toEncoding = genericToEncoding defaultOptions
data BlogDB = BlogDB {
articles :: Map ArticleID ArticleExport
, tags :: Map String [ArticleID]
, skin :: SkinExport
} deriving (Generic)
instance ToJSON BlogDB where
toEncoding = genericToEncoding defaultOptions
remap :: (Ord k1, Enum k2, Ord k2) => Map k1 a -> Map k1 k2
remap =
snd . foldlWithKey (\(i, tempMap) key _ -> (succ i, Map.insert key i tempMap)) (toEnum 0, Map.empty)
export :: Blog -> FileID -> Article -> ArticleExport
export blog fileID article = ArticleExport {
source = "/" </> Article.urlPath article <.> "md"
, title = Article.title article
, metadata = Article.metadata article
, tagged = Map.keys . Map.filter (Set.member fileID) $ Blog.tags blog
}
exportBlog :: ReaderT Blog IO ByteString
exportBlog = do
blog <- ask
let reindex = remap $ Blog.articles blog
return . encode $ BlogDB {
articles = mapKeys (reindex !) $ mapWithKey (export blog) (Blog.articles blog)
, tags = fmap (reindex !) . Set.elems <$> Blog.tags blog
, skin = SkinExport {
previewArticlesCount = Blog.previewArticlesCount $ Blog.skin blog
, previewLinesCount = Blog.previewLinesCount $ Blog.skin blog
}
}