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{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE LambdaCase #-}
{-# LANGUAGE TupleSections #-}
-- | Simple directed graphs, for dependency checking
module Dirgraph where
import Universum
import CheckMap (MapResult (mapresultDepends))
import Data.Map.Strict (mapMaybeWithKey, mapWithKey)
import qualified Data.Map.Strict as M
import Data.Set ((\\))
import qualified Data.Set as S
import Paths (normalise)
import qualified Text.Dot as D
import Text.Dot (Dot, (.->.))
import Types (Dep (LocalMap))
-- | a simple directed graph
type Graph a = Map a (Set a)
nodes :: Graph a -> Set a
nodes = M.keysSet
-- | simple directed graph of exits
resultToGraph :: Map FilePath (MapResult a) -> Graph FilePath
resultToGraph = fmap (S.fromList . mapMaybe onlyLocalMaps . mapresultDepends)
where onlyLocalMaps = \case
LocalMap path -> Just (normalise "" path)
_ -> Nothing
-- | invert edges of a directed graph
invertGraph :: (Eq a, Ord a) => Graph a -> Graph a
invertGraph graph = mapWithKey collectFroms graph
where collectFroms to _ = S.fromList . elems . mapMaybeWithKey (select to) $ graph
select to from elems = if to `elem` elems then Just from else Nothing
-- | all nodes reachable from some entrypoint
reachableFrom :: Ord a => a -> Graph a -> Set a
reachableFrom entrypoint graph = recursive mempty (S.singleton entrypoint)
where recursive seen current
| null current = seen
| otherwise = recursive (S.union seen current) (next \\ seen)
where next = S.unions
. S.fromList -- for some reason set is not filterable?
. mapMaybe (`M.lookup` graph)
. S.toList
$ current
unreachableFrom :: Ord a => a -> Graph a -> Set a
unreachableFrom entrypoint graph =
nodes graph \\ reachableFrom entrypoint graph
takeSubGraph :: (Eq a, Ord a) => Int -> a -> Graph a -> Graph a
takeSubGraph i start graph
| i <= 0 = mempty
| i == 1 =
M.singleton start reachable
`M.union` M.fromList ((,mempty) <$> S.toList reachable)
| otherwise =
M.singleton start reachable
`M.union` (M.unionsWith S.union
. S.map (flip (takeSubGraph (i-1)) graph)
$ reachable)
where reachable = fromMaybe mempty (M.lookup start graph)
graphToDot :: Graph FilePath -> Dot ()
graphToDot graph = do
main <- D.node [("label","main.json")]
nodes' <- M.traverseMaybeWithKey
(\name edges -> if name /= "main.json"
then D.node [("label",name)] <&> (, edges) <&> Just
else pure Nothing
)
graph
let reachable = fromMaybe mempty (M.lookup "main.json" graph)
let nodes = M.insert "main.json" (main,reachable) nodes'
forM_ nodes $ \(node, edges) ->
forM_ edges $ \key ->
case M.lookup key nodes of
Just (other,_) -> node .->. other
_ -> pure ()
|
