1 files changed, 76 insertions, 0 deletions
diff --git a/lib/CheckDir.hs b/lib/CheckDir.hs
new file mode 100644
index 0000000..1ca71eb
--- /dev/null
+++ b/lib/CheckDir.hs
@@ -0,0 +1,76 @@
+{-# LANGUAGE DeriveAnyClass    #-}
+{-# LANGUAGE DeriveGeneric     #-}
+{-# LANGUAGE LambdaCase        #-}
+{-# LANGUAGE OverloadedStrings #-}
+
+-- | Module that contains high-level checking for an entire directory
+module CheckDir (recursiveCheckDir)  where
+
+import           CheckMap     (MapResult, loadAndLintMap, mapresultDepends)
+import           Data.Aeson   (ToJSON)
+import           Data.Map     (Map)
+import qualified Data.Map     as M
+import           Data.Text    (Text)
+import qualified Data.Text    as T
+import           GHC.Generics (Generic)
+import           Paths        (normalise)
+import           Types        (Dep (LocalMap))
+import           Util         (PrettyPrint (prettyprint))
+
+
+data DirResult = DirResult
+  { dirresultMaps :: [MapResult]
+  , dirresultDeps :: [Text]
+  } deriving (Generic, ToJSON)
+
+
+instance PrettyPrint DirResult where
+  prettyprint res = "Here's a result:" <> T.concat (map prettyprint $ dirresultMaps res)
+
+-- based on the startling observation that Data.Map has lower complexity
+-- for difference than Data.Set, but the same complexity for fromList
+type Set a = Map a ()
+
+
+instance Semigroup DirResult where
+  a <> b = DirResult
+    { dirresultMaps = dirresultMaps a <> dirresultMaps b
+    , dirresultDeps = dirresultDeps a <> dirresultDeps b
+    }
+
+instance Monoid DirResult where
+  mempty = DirResult
+    { dirresultMaps = []
+    , dirresultDeps = []
+    }
+
+
+-- TODO: options?
+recursiveCheckDir :: FilePath -> IO DirResult
+recursiveCheckDir root = recursiveCheckDir' [root] mempty mempty
+
+
+recursiveCheckDir' :: [FilePath] -> Set FilePath -> DirResult -> IO DirResult
+recursiveCheckDir' paths done acc = do
+  putStrLn $ "linting " <> show paths
+  -- lint all maps in paths
+  lints <- mapM  loadAndLintMap paths
+  -- get new deps
+  let deps = concatMap mapresultDepends lints
+  -- filter deps for map dependencies
+  let mapdeps =
+        map (\(LocalMap path) -> normalise path)
+        . filter (\case { LocalMap _ -> True; _ -> False })
+        $ deps
+  -- build a Map FilePath () containing all map dependencies
+  let mapmapdeps = M.fromList $ zip mapdeps (repeat ())
+  -- take difference of that with what's already done (O(m+n))
+  let unknowns = map fst . M.toList $ M.difference mapmapdeps done
+  let known = M.union done . M.fromList . zip paths $ repeat ()
+
+  let acc' = acc <> DirResult
+                { dirresultMaps = lints
+                , dirresultDeps = [] }
+  case unknowns of
+    [] -> pure acc'
+    _  -> recursiveCheckDir' unknowns known acc'