Initial YAML support

See #225

2 files changed, 32 insertions, 0 deletions

diff --git a/src/Data/List/Extended.hs b/src/Data/List/Extended.hs
new file mode 100644
index 0000000..485cba8
--- /dev/null
+++ b/src/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
diff --git a/src/Data/Yaml/Extended.hs b/src/Data/Yaml/Extended.hs
new file mode 100644
index 0000000..9ad05f3
--- /dev/null
+++ b/src/Data/Yaml/Extended.hs
@@ -0,0 +1,17 @@
+module Data.Yaml.Extended
+    ( module Data.Yaml
+    , toString
+    , toList
+    ) where
+
+import qualified Data.Text   as T
+import qualified Data.Vector as V
+import           Data.Yaml
+
+toString :: Value -> Maybe String
+toString (String t) = Just (T.unpack t)
+toString _          = Nothing
+
+toList :: Value -> Maybe [Value]
+toList (Array a) = Just (V.toList a)
+toList _         = Nothing