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-- |
-- Module : Zettel.Parse
-- Description : Parse the org-zettelkasten files and split them into Zettel
-- Copyright : (c) 2023, Yann Herklotz
-- License : GPL-3
-- Maintainer : git [at] yannherklotz [dot] com
-- Stability : experimental
-- Portability : POSIX
module Zettel.Parse where
import Data.Default (def)
import qualified Data.Map.Strict as Map
import qualified Data.Text as T
import System.FilePath (takeBaseName)
import Text.Pandoc.Builder (toMetaValue)
import Text.Pandoc.Chunks (Chunk (..), ChunkedDoc (..), splitIntoChunks)
import Text.Pandoc.Class (runIOorExplode)
import Text.Pandoc.Definition (Block (..), Inline (..), Meta (..), MetaValue (..), Pandoc (..))
import Text.Pandoc.Options (ReaderOptions (..), getDefaultExtensions)
import Text.Pandoc.Readers (readOrg)
import Text.Pandoc.Shared (stringify)
import Text.Pandoc.Walk (query, walk)
import Zettel.Common
import Zettel.Types
decode :: ByteString -> Text
decode = decodeUtf8
removeHeadings :: Block -> Block
removeHeadings Header {} = Plain []
removeHeadings a = a
removeDiv :: [Block] -> [Block]
removeDiv = concatMap removeDiv'
where
removeDiv' (Div _ b') = b'
removeDiv' a = [a]
queryHeaderMetaData :: [Block] -> [(Text, MetaValue)]
queryHeaderMetaData = query headingAttr
where
headingAttr (Header _ (_, _, l) i) =
map (bimap exportDate MetaString) l
<> [ ("title", MetaInlines i),
("author", MetaInlines [Str "Yann", Space, Str "Herklotz"])
]
headingAttr _ = []
exportDate s
| s == "export_date" = "date"
| otherwise = s
removeSpan :: [Inline] -> [Inline]
removeSpan = concatMap removeSpan'
where
removeSpan' (Span _ _) = []
removeSpan' a = [a]
removeMathNL :: Inline -> Inline
removeMathNL (Math mt t) = Math mt . fold $ T.lines t
removeMathNL a = a
separateTitleTags :: [Inline] -> ([Inline], [ZettelTag])
separateTitleTags title =
(walk removeSpan $ filter (not . isTagSpan) title, map (ZettelTag . stringify) $ filter isTagSpan title)
where
isTagSpan (Span (_, l, _) _) = "tag" `elem` l
isTagSpan _ = False
parseDate :: Text -> Maybe Text
parseDate t
| T.null t = Just t
| T.head t == '[' = viaNonEmpty head . T.words $ T.tail t
| otherwise = Just t
parseDateVal :: MetaValue -> Maybe MetaValue
parseDateVal v = MetaString <$> (metaToString v >>= parseDate)
zettelMetaFromMeta :: [ZettelTag] -> [ZettelCat] -> Meta -> ZettelMetadata
zettelMetaFromMeta t c m =
ZettelMetadata
(lookupString "date" m)
(lookupString "modified" m)
t
c
(Just "Yann Herklotz")
pandocFromChunk :: (Int, Text, Chunk) -> Pandoc
pandocFromChunk (_, t, c) =
walk removeMathNL
. walk removeDiv
. walk removeHeadings
. Pandoc
( Meta
( fromList
( ("categories", toMetaValue [t])
: ("zettelid", MetaString (chunkId c))
: headingMeta
)
)
)
$ chunkContents c
where
headingMeta = queryHeaderMetaData $ chunkContents c
zettelFromPandoc :: Pandoc -> (ZettelId, Zettel)
zettelFromPandoc p@(Pandoc attr _) =
(ZettelId ident, Zettel title (zettelMetaFromMeta tags cats attr) p cempty cempty)
where
ident = fromMaybe "" $ lookupString "zettelid" attr
title = fromMaybe [] $ lookupInlines "title" attr
tags = maybe [] (map ZettelTag) $ lookupTextList "tags" attr
cats = maybe [] (map ZettelCat) $ lookupTextList "categories" attr
bibFromPandoc :: Pandoc -> (BibId, Zettel)
bibFromPandoc p = first (\(ZettelId i) -> BibId i) $ zettelFromPandoc p
updatePandocAttr :: Pandoc -> Pandoc
updatePandocAttr (Pandoc attr b) =
Pandoc
( Meta
( Map.insert
"tags"
tags
. Map.insert
"title"
(MetaInlines title')
. Map.update
parseDateVal
"modified"
. Map.update parseDateVal "date"
$ unMeta attr
)
)
b
where
tags = toMetaValue $ map unZettelTag tags'
(title', tags') = maybe ([], []) separateTitleTags $ lookupInlines "title" attr
propagateNames :: [((Int, Text), [Chunk])] -> [(Int, Text, Chunk)]
propagateNames n =
[(i, name, chunk) | ((i, name), namedChunk) <- n, chunk <- namedChunk]
readFileUtf8 :: FilePath -> IO Text
readFileUtf8 = fmap decode . readFileBS
readOrgFile :: Text -> IO Pandoc
readOrgFile = runIOorExplode . readOrg (def {readerExtensions = getDefaultExtensions "org"})
parseBibliography :: FilePath -> IO [Pandoc]
parseBibliography fp = do
pandoc <- readFileUtf8 fp >>= readOrgFile
let splitChunks = chunkedChunks $ splitIntoChunks "%i.md" False Nothing 1 pandoc
return $ map (updatePandocAttr . pandocFromChunk . (\c -> (8, "bibliography", c))) splitChunks
parseZettelKasten :: [(Int, FilePath)] -> Maybe FilePath -> IO ZettelGraph
parseZettelKasten fl bibPath = do
let names = map (second (T.pack . takeBaseName)) fl
fs <- mapM (readFileUtf8 . snd) fl
orgFiles <- mapM readOrgFile fs
let splitChunks = map (splitIntoChunks "%i.md" False Nothing 15) orgFiles
let chunks = propagateNames . zip names $ map chunkedChunks splitChunks
let pandocList = map (updatePandocAttr . pandocFromChunk) chunks
bibliography <- maybe mempty parseBibliography bibPath
return . refreshPandocMeta $
ZettelGraph
(fromList $ map zettelFromPandoc pandocList)
(fromList $ map bibFromPandoc bibliography)
|
