101 lines
3.3 KiB
Haskell
101 lines
3.3 KiB
Haskell
{-# LANGUAGE NamedFieldPuns #-}
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{-# LANGUAGE FlexibleContexts #-}
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module Blog (
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Blog(..)
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, Path(..)
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, Skin(..)
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, Wording
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, build
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, get
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) where
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import Arguments (Arguments)
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import qualified Arguments (name, sourceDir)
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import Article (Article)
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import qualified Article (at, getKey)
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import Blog.Path (Path(..))
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import qualified Blog.Path as Path (build)
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import Blog.Skin (Skin(..))
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import qualified Blog.Skin as Skin (build)
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import Blog.Wording (Wording)
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import qualified Blog.Wording as Wording (build)
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import Control.Monad ((>=>), filterM, foldM, forM)
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import Control.Monad.Reader (MonadReader, ask)
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import Data.Map (Map, insert, lookup)
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import qualified Data.Map as Map (empty, fromList)
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import Data.Set (Set)
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import qualified Data.Set as Set (empty, null, singleton, union)
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import Files (File(..), absolute)
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import qualified Files (find)
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import Page (Page)
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import qualified Page (at)
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import Prelude hiding (lookup)
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import System.Directory (doesFileExist, withCurrentDirectory)
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import System.FilePath ((</>), dropTrailingPathSeparator, takeExtension, takeFileName)
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import Text.Parsec (ParseError)
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type Collection = Map String
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type Parsed a = Either ParseError (String, a)
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data Blog = Blog {
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articles :: Collection Article
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, name :: String
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, pages :: Collection Page
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, path :: Path
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, skin :: Skin
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, tags :: Map String (Set String)
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, wording :: Wording
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}
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get :: MonadReader Blog m => (Blog -> a) -> m a
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get = (<$> ask)
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keepOrWarn :: Collection a -> Parsed a -> IO (Collection a)
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keepOrWarn accumulator (Left parseErrors) =
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forM [show parseErrors, "=> Ignoring this text"] putStrLn
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>> return accumulator
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keepOrWarn accumulator (Right (key, article)) =
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return $ insert key article accumulator
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find :: (FilePath -> IO (Parsed a)) -> FilePath -> IO (Collection a)
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find parser =
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Files.find
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>=> filterM isMarkDownFile
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>=> mapM parser
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>=> foldM keepOrWarn Map.empty
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where
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isMarkDownFile path = do
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let correctExtension = takeExtension path == ".md"
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(correctExtension &&) <$> doesFileExist path
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tagged :: Collection Article -> FilePath -> IO (String, Set String)
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tagged collection path = do
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links <- Files.find path
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keys <- forM links $ \link -> do
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fileExists <- doesFileExist link
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return $ if fileExists
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then let articleKey = Article.getKey link in
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maybe Set.empty (\_ -> Set.singleton articleKey) (lookup articleKey collection)
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else Set.empty
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return (takeFileName path, foldl Set.union Set.empty keys)
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discover :: Path -> IO (Collection Article, Collection Page, Collection (Set String))
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discover path = do
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articles <- find (Article.at) $ articlesPath path
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pages <- maybe (return Map.empty) (find (Page.at)) $ pagesPath path
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tags <- Map.fromList . filter (not . Set.null . snd)
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<$> (Files.find (articlesPath path </> "tags") >>= mapM (articles `tagged`))
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return (articles, pages, tags)
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build :: Arguments -> IO Blog
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build arguments = do
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wording <- Wording.build arguments
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root <- Files.absolute . Dir $ Arguments.sourceDir arguments
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withCurrentDirectory root $ do
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path <- Path.build root arguments
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let name = maybe (takeFileName $ dropTrailingPathSeparator root) id
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$ Arguments.name arguments
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skin <- Skin.build name arguments
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(articles, pages, tags) <- discover path
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return $ Blog {articles, name, pages, path, skin, tags, wording}
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