From 163da5a4b6268de54594e18f69f06799df637305 Mon Sep 17 00:00:00 2001
From: Łukasz Hanuszczak <lukasz.hanuszczak@gmail.com>
Date: Tue, 18 Aug 2015 18:06:59 +0200
Subject: Create utility function for recursive obtaining directory contents.

---
 haddock-test/src/Test/Haddock/Utils.hs | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

(limited to 'haddock-test/src/Test/Haddock')

diff --git a/haddock-test/src/Test/Haddock/Utils.hs b/haddock-test/src/Test/Haddock/Utils.hs
index 1d57107f..4640fe97 100644
--- a/haddock-test/src/Test/Haddock/Utils.hs
+++ b/haddock-test/src/Test/Haddock/Utils.hs
@@ -1,8 +1,33 @@
 module Test.Haddock.Utils where
 
 
+import Control.Monad
+
 import Data.Maybe
 
+import System.Directory
+import System.FilePath
+
 
 mlast :: [a] -> Maybe a
 mlast = listToMaybe . reverse
+
+
+partitionM :: Monad m => (a -> m Bool) -> [a] -> m ([a], [a])
+partitionM _ [] = pure ([], [])
+partitionM p (x:xs) = do
+    (ss, fs) <- partitionM p xs
+    b <- p x
+    pure $ if b then (x:ss, fs) else (ss, x:fs)
+
+
+getDirectoryTree :: FilePath -> IO [FilePath]
+getDirectoryTree path = do
+    (dirs, files) <- partitionM isDirectory =<< contents
+    subfiles <- fmap concat . forM dirs $ \dir ->
+        map (dir </>) <$> getDirectoryTree (path </> dir)
+    pure $ files ++ subfiles
+  where
+    contents = filter realEntry <$> getDirectoryContents path
+    isDirectory entry = doesDirectoryExist $ path </> entry
+    realEntry entry = not $ entry == "." || entry == ".."
-- 
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