1 files changed, 42 insertions, 0 deletions
diff --git a/app/Backend/CommitHash.hs b/app/Backend/CommitHash.hs
new file mode 100644
index 0000000..7ec1d54
--- /dev/null
+++ b/app/Backend/CommitHash.hs
@@ -0,0 +1,42 @@
+module Backend.CommitHash
+  ( CommitHash (..),
+    toShortText,
+    toText,
+    toTextUnsafe,
+  )
+where
+
+import Data.Binary (Binary)
+import Data.Maybe (fromMaybe)
+import Data.Text qualified as T
+import GHC.Generics (Generic)
+import Render qualified as P
+
+data CommitHash
+  = WorkingTree
+  | Commit T.Text
+  deriving (Eq, Ord, Show, Binary, Generic)
+
+toShortText :: CommitHash -> Maybe T.Text
+toShortText = fmap (T.take 7) . toText
+
+toText :: CommitHash -> Maybe T.Text
+toText WorkingTree = Nothing
+toText (Commit hash) = Just hash
+
+toTextUnsafe :: CommitHash -> T.Text
+toTextUnsafe (Commit hash) = hash
+toTextUnsafe _ = error "toTextUnsafe: WorkingDir"
+
+instance P.Render CommitHash where
+  render = P.render . P.Detailed
+
+instance P.Render (P.Detailed CommitHash) where
+  render (P.Detailed commitHash) =
+    P.styled [P.color P.Yellow] $
+      P.render (fromMaybe "<dirty>" (toText commitHash))
+
+instance P.Render (P.Summarized CommitHash) where
+  render (P.Summarized commitHash) =
+    P.styled [P.color P.Yellow] $
+      P.render (fromMaybe "<dirty>" (toShortText commitHash))