1 files changed, 12 insertions, 2 deletions
diff --git a/app/SlackBuilder/Package.hs b/app/SlackBuilder/Package.hs
index cc07cc5..cc3ea42 100644
--- a/app/SlackBuilder/Package.hs
+++ b/app/SlackBuilder/Package.hs
@@ -1,13 +1,15 @@
 module SlackBuilder.Package
     ( DownloadPlaceholder(..)
     , Download(..)
+    , DownloadTemplate(..)
     , PackageInfo(..)
     , Maintainer(..)
     , Updater(..)
     , infoTemplate
+    , renderDownloadWithVersion
     ) where
 
-import Data.List.NonEmpty (NonEmpty)
+import Data.List.NonEmpty (NonEmpty(..))
 import Data.Text (Text)
 import qualified Data.Text as Text
 import Text.URI (URI(..))
@@ -17,6 +19,7 @@ import GHC.Records (HasField(..))
 import System.FilePath (takeBaseName)
 import Data.List (partition)
 import SlackBuilder.Trans
+import Control.Monad.Catch (MonadThrow)
 
 -- | Download URI with the MD5 checksum of the target.
 data Download = Download
@@ -60,8 +63,15 @@ instance Show DownloadTemplate
   where
     show (DownloadTemplate components) = concatMap show components
 
+renderDownloadWithVersion :: MonadThrow m => DownloadTemplate -> Text -> m URI
+renderDownloadWithVersion (DownloadTemplate components) version =
+    URI.mkURI $ foldr f "" components
+  where
+    f (StaticPlaceholder staticPlaceholder) accumulator = accumulator <> staticPlaceholder
+    f VersionPlaceholder accumulator = accumulator <> version
+
 -- | Function used to get the latest version of a source.
-newtype Updater = Updater (SlackBuilderT (Maybe Text))
+data Updater = Updater (SlackBuilderT (Maybe Text)) DownloadTemplate
 
 packageName :: PackageInfo -> Text
 packageName PackageInfo{ path } = Text.pack $ takeBaseName path