85 lines
2.8 KiB
Haskell
85 lines
2.8 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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, build
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, get
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) where
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import Arguments (Arguments(bannerPath, blogName, headPath, sourceDir))
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import qualified Arguments (previewArticlesCount, previewLinesCount)
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import Article (Article)
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import qualified Article (at)
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import Control.Monad ((>=>), filterM, forM)
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import Control.Monad.Reader (MonadReader, ask)
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import Data.Map (Map)
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import qualified Data.Map as Map (fromList, member)
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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 qualified Files (find)
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import System.Directory (doesFileExist, withCurrentDirectory)
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import System.FilePath ((</>), dropTrailingPathSeparator, splitFileName, takeExtension, takeFileName)
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import System.Posix.Types (FileID)
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import System.Posix.Files (getFileStatus, fileID)
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type Collection = Map FileID Article
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data Blog = Blog {
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articles :: Collection
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, name :: String
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, previewArticlesCount :: Int
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, previewLinesCount :: Int
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, root :: FilePath
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, tags :: Map String (Set FileID)
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, customBanner :: Maybe String
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, customHead :: Maybe String
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}
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get :: MonadReader Blog m => (Blog -> a) -> m a
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get = (<$> ask)
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findArticles :: Int -> FilePath -> IO (Map FileID Article)
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findArticles linesCount =
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Files.find
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>=> filterM isMarkDownFile
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>=> mapM (Article.at linesCount)
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>=> return . Map.fromList
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where
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isMarkDownFile path = do
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let correctExtension = takeExtension path == ".md"
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(correctExtension &&) <$> doesFileExist path
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tagged :: Collection -> FilePath -> IO (String, Set FileID)
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tagged collection path = do
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links <- Files.find path
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fileIDs <- forM links $ \link -> do
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fileExists <- doesFileExist link
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if fileExists
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then do
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inode <- fileID <$> getFileStatus link
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return $ if Map.member inode collection then Set.singleton inode else Set.empty
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else return Set.empty
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return (takeFileName path, foldl Set.union Set.empty fileIDs)
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build :: Arguments -> IO Blog
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build arguments = withCurrentDirectory root $ do
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let name = maybe (takeFileName $ dropTrailingPathSeparator root) id $ blogName arguments
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let previewLinesCount = Arguments.previewLinesCount arguments
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articles <- findArticles previewLinesCount articlesPath
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tags <- Map.fromList . filter (not . Set.null . snd)
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<$> (Files.find (articlesPath </> "tags") >>= mapM (articles `tagged`))
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customBanner <- mapM readFile $ bannerPath arguments
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customHead <- mapM readFile $ headPath arguments
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return $ Blog {
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articles
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, name
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, previewArticlesCount = Arguments.previewArticlesCount arguments
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, previewLinesCount
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, root
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, tags
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, customBanner
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, customHead
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}
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where
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(root, articlesPath) = splitFileName $ sourceDir arguments
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