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{-# LANGUAGE OverloadedRecordDot #-}
module Zettel.Links where
import Data.Char (isAlphaNum, isLetter, isNumber)
import Data.List (nub)
import qualified Data.Map.Strict as Map
import qualified Data.Text as T
import Data.Text.Read (decimal)
import Numeric (readInt, showIntAtBase)
import Text.Pandoc.Definition (Inline (..), Pandoc (..))
import Text.Pandoc.Shared (stringify)
import Text.Pandoc.Walk (query, walk)
import Zettel.Common
import Zettel.Types
parseIds :: Text -> Text
parseIds t
| T.null t = ""
| T.head t == '#' && T.all isAlphaNum (T.tail t) = T.tail t
| otherwise = ""
splitId :: ZettelId -> [Text]
splitId (ZettelId zid)
| T.null zid = []
| isNumber (T.head zid) = T.takeWhile isNumber zid : (splitId . ZettelId $ T.dropWhile isNumber zid)
| isLetter (T.head zid) = T.takeWhile isLetter zid : (splitId . ZettelId $ T.dropWhile isLetter zid)
| otherwise = []
combineId :: [Text] -> ZettelId
combineId = ZettelId . fold
intToDigit26 :: Int -> Char
intToDigit26 i
| i <= 25 && i >= 0 = toEnum $ fromEnum 'a' + i
| otherwise = error "Integer out of range."
digitToInt26 :: Char -> Int
digitToInt26 c = fromEnum c - fromEnum 'a'
fromBase :: Int -> String -> Maybe Int
fromBase base = fmap fst . viaNonEmpty head . readInt base ((< base) . digitToInt26) digitToInt26
toBase :: Int -> Int -> String
toBase base num = showIntAtBase base intToDigit26 num ""
opOnBase26 :: (Int -> Int) -> Text -> Maybe Text
opOnBase26 f t =
fromString . toBase 26 . f <$> fromBase 26 (toString t)
opOnIdPart :: (Int -> Int) -> Text -> Maybe Text
opOnIdPart f t
| T.null t = Nothing
| isNumber $ T.head t =
case decimal t of
Right (a, _) -> Just . show $ f a
_ -> Nothing
| isLetter $ T.head t = opOnBase26 f t
| otherwise = Nothing
defPredId :: ZettelId -> Maybe ZettelId
defPredId z =
case nonEmpty (splitId z) of
Just ne ->
if last ne == "a" || last ne == "1"
then Just (combineId (init ne))
else combineId . (init ne <>) . (: []) <$> opOnIdPart (subtract 1) (last ne)
Nothing -> Nothing
defNextId :: ZettelId -> Maybe ZettelId
defNextId z =
case nonEmpty (splitId z) of
Just ne ->
combineId . (init ne <>) . (: []) <$> opOnIdPart (+ 1) (last ne)
Nothing -> Nothing
defBranchId :: ZettelId -> Maybe ZettelId
defBranchId (ZettelId t)
| T.null t = Nothing
| isNumber $ T.last t = Just (ZettelId (t <> "a"))
| isLetter $ T.last t = Just (ZettelId (t <> "1"))
| otherwise = Nothing
gatherForwardIds :: Inline -> [ZettelId]
gatherForwardIds (Link _ i _) = [ZettelId . parseIds $ stringify i]
gatherForwardIds _ = []
addIdPresent :: ZettelGraph -> Maybe ZettelId -> [ZettelId]
addIdPresent zg (Just ident) =
[ident | ident `elem` Map.keys (unZettelGraph zg)]
addIdPresent _ Nothing = []
forwardLinkNode :: ZettelGraph -> ZettelId -> Zettel -> Zettel
forwardLinkNode zg ident zn =
zn
{ zettelNext =
nub
( query gatherForwardIds zn.zettelBody
<> addIdPresent zg (defNextId ident)
<> addIdPresent zg (defBranchId ident)
)
}
forwardLink :: ZettelGraph -> ZettelGraph
forwardLink zg = ZettelGraph . Map.mapWithKey (forwardLinkNode zg) $ unZettelGraph zg
backwardLinkNode :: ZettelGraph -> ZettelId -> Zettel -> Zettel
backwardLinkNode graph ident node = Map.foldlWithKey' f node (unZettelGraph graph)
where
f :: Zettel -> ZettelId -> Zettel -> Zettel
f l ident' zg
| ident `elem` zg.zettelNext =
l {zettelPrev = ident' : l.zettelPrev}
| otherwise = l
backwardLink :: ZettelGraph -> ZettelGraph
backwardLink zg = ZettelGraph . Map.mapWithKey (backwardLinkNode zg) $ unZettelGraph zg
updatePandocLinksInline :: Inline -> Inline
updatePandocLinksInline l@(Link a i (_, t))
| not $ T.null ids = Link a i ("/tree/" <> ids, t)
| otherwise = l
where
ids = parseIds $ stringify i
updatePandocLinksInline i = i
updatePandocLinksPandoc :: Pandoc -> Pandoc
updatePandocLinksPandoc = walk updatePandocLinksInline
updatePandocLinksZettel :: Zettel -> Zettel
updatePandocLinksZettel zg =
zg {zettelBody = updatePandocLinksPandoc (zettelBody zg)}
updatePandocLinks :: ZettelGraph -> ZettelGraph
updatePandocLinks zg = ZettelGraph $ updatePandocLinksZettel <$> unZettelGraph zg
linkAll :: ZettelGraph -> ZettelGraph
linkAll = refreshPandocMeta . backwardLink . forwardLink . updatePandocLinks
|
