module Post where

import qualified Data.Text                     as T
import           System.FilePath
import           Text.Pandoc

type RawPost = (FilePath, T.Text)

type RichPost = (FilePath, Pandoc)

parsePosts :: [RawPost] -> [(FilePath, Either PandocError Pandoc)]
parsePosts = map (\(path, contents) -> (path, parsePost contents))

parsePost :: T.Text -> Either PandocError Pandoc
parsePost contents = runPure $ readMarkdown readerOptions contents

renderPosts :: String -> [RichPost] -> [(FilePath, Either PandocError T.Text)]
renderPosts layout =
  map (\(path, post) -> (path, renderPost layout (path, post)))

renderPost :: String -> RichPost -> Either PandocError T.Text
renderPost layout (path, post) =
  runPure $ writeHtml5String (writerOptions $ Just layout) post

readerOptions :: ReaderOptions
readerOptions =
  let extensions = extensionsFromList
        [ Ext_fenced_code_attributes
        , Ext_fenced_code_blocks
        , Ext_footnotes
        , Ext_link_attributes
        , Ext_yaml_metadata_block
        , Ext_simple_tables
        ]
  in  def { readerExtensions = extensions }

writerOptions :: Maybe String -> WriterOptions
writerOptions layout = case layout of
  Just t  -> def { writerTemplate = Just t }
  Nothing -> def