1 files changed, 35 insertions, 0 deletions
diff --git a/src/Hakyll/Web/Template/Read/Hakyll.hs b/src/Hakyll/Web/Template/Read/Hakyll.hs
new file mode 100644
index 0000000..fecf772
--- /dev/null
+++ b/src/Hakyll/Web/Template/Read/Hakyll.hs
@@ -0,0 +1,35 @@
+-- | Read templates in Hakyll's native format
+--
+module Hakyll.Web.Template.Read.Hakyll
+    ( readTemplate
+    ) where
+
+import Data.List (isPrefixOf)
+import Data.Char (isAlphaNum)
+
+import Hakyll.Web.Template.Internal
+
+-- | Construct a @Template@ from a string.
+--
+readTemplate :: String -> Template
+readTemplate = Template . readTemplate'
+  where
+    readTemplate' [] = []
+    readTemplate' string
+        | "$$" `isPrefixOf` string =
+            Escaped : readTemplate' (drop 2 string)
+        | "$" `isPrefixOf` string =
+            case readKey (drop 1 string) of
+                Just (key, rest) -> Key key : readTemplate' rest
+                Nothing          -> Chunk "$" : readTemplate' (drop 1 string)
+        | otherwise =
+            let (chunk, rest) = break (== '$') string
+            in Chunk chunk : readTemplate' rest
+
+    -- Parse an key into (key, rest) if it's valid, and return
+    -- Nothing otherwise
+    readKey string =
+        let (key, rest) = span isAlphaNum string
+        in if not (null key) && "$" `isPrefixOf` rest
+            then Just (key, drop 1 rest)
+            else Nothing