1 files changed, 13 insertions, 4 deletions
diff --git a/app/Git.hs b/app/Git.hs
index 57fffdc..7891288 100644
--- a/app/Git.hs
+++ b/app/Git.hs
@@ -1,15 +1,24 @@
-module Git (withWorkingTree) where
+module Git
+  ( withWorkingTree,
+    getCommitHashes,
+  )
+where
 
 import Control.Exception (finally)
-import Data.Text (Text)
-import Process (proc, sh_)
+import Data.ByteString.Lazy.Char8 qualified as LB8
+import Data.Text qualified as T
+import Data.Text.Encoding qualified as T
+import Process (proc, sh, sh_)
 import System.Directory (createDirectoryIfMissing)
 import System.FilePath (dropTrailingPathSeparator, takeDirectory)
 
 -- | Runs an IO-action within a working tree.
-withWorkingTree :: FilePath -> Text -> IO a -> IO a
+withWorkingTree :: FilePath -> T.Text -> IO a -> IO a
 withWorkingTree path hash action = do
   createDirectoryIfMissing True (takeDirectory (dropTrailingPathSeparator path))
   sh_ $ proc "git worktree add --quiet --detach % %" path hash
   action `finally` do
     sh_ $ proc "git worktree remove --force %" path
+
+getCommitHashes :: IO [T.Text]
+getCommitHashes = T.lines . T.decodeUtf8 . LB8.toStrict <$> sh "git log --format=%H"