Move src/ to lib/, put Init.hs in src/

1 files changed, 15 insertions, 0 deletions

diff --git a/lib/Data/List/Extended.hs b/lib/Data/List/Extended.hs
new file mode 100644
index 0000000..485cba8
--- /dev/null
+++ b/lib/Data/List/Extended.hs
@@ -0,0 +1,15 @@
+module Data.List.Extended
+    ( module Data.List
+    , breakWhen
+    ) where
+
+import           Data.List
+
+-- | Like 'break', but can act on the entire tail of the list.
+breakWhen :: ([a] -> Bool) -> [a] -> ([a], [a])
+breakWhen predicate = go []
+  where
+    go buf []                = (reverse buf, [])
+    go buf (x : xs)
+        | predicate (x : xs) = (reverse buf, x : xs)
+        | otherwise          = go (x : buf) xs