addpath: detect expandable paths

1 files changed, 47 insertions, 0 deletions

diff --git a/app/Utils/Path.hs b/app/Utils/Path.hs
new file mode 100644
index 0000000..01259e7
--- /dev/null
+++ b/app/Utils/Path.hs
@@ -0,0 +1,47 @@
+-- |
+-- Copyright   : (c) 2017 Egor Tensin <Egor.Tensin@gmail.com>
+-- License     : MIT
+-- Maintainer  : Egor.Tensin@gmail.com
+-- Stability   : experimental
+-- Portability : Windows-only
+
+module Utils.Path
+    ( ExpandedPath(..)
+    , pathExpandValue
+
+    , pathExpandAll
+    , pathAnyExpanded
+    ) where
+
+import Control.Monad.Trans.Except (ExceptT)
+
+import qualified WindowsEnv
+
+data ExpandedPath = ExpandedPath
+    { pathOriginal :: String
+    , pathExpanded :: String
+    } deriving (Eq, Show)
+
+pathExpandValue :: WindowsEnv.Value -> ExceptT IOError IO [ExpandedPath]
+pathExpandValue value
+    | WindowsEnv.valueExpandable value = do
+        expanded <- expandOnce
+        zipWith ExpandedPath split <$>
+            if length expanded == length split
+                then return expanded
+                else expandEach
+    | otherwise = return $ zipWith ExpandedPath split split
+  where
+    joined = WindowsEnv.valueString value
+    split = WindowsEnv.pathSplit joined
+    expandOnce = WindowsEnv.pathSplit <$> WindowsEnv.expand joined
+    expandEach = WindowsEnv.expandAll split
+
+pathExpandAll :: [String] -> ExceptT IOError IO [ExpandedPath]
+pathExpandAll paths = zipWith ExpandedPath paths <$> WindowsEnv.expandAll paths
+
+pathIsExpanded :: ExpandedPath -> Bool
+pathIsExpanded path = pathOriginal path /= pathExpanded path
+
+pathAnyExpanded :: [ExpandedPath] -> Bool
+pathAnyExpanded = any pathIsExpanded