chore: drop tree-grepper

Regresses in that we only support Haskell for now, as Elm, Nix or Bash
are not available as tree-sitter-* Haskell packages.

1 files changed, 39 insertions, 0 deletions

diff --git a/app/Comment/Language.hs b/app/Comment/Language.hs
new file mode 100644
index 0000000..009c6e6
--- /dev/null
+++ b/app/Comment/Language.hs
@@ -0,0 +1,39 @@
+module Comment.Language
+  ( Language (..),
+    fromExtension,
+    parser,
+    lineStart,
+    block,
+    nodeTypes,
+  )
+where
+
+import Control.Exception (throw)
+import Data.Binary (Binary)
+import Data.Text qualified as T
+import Exception qualified as E
+import Foreign.Ptr (Ptr)
+import GHC.Generics (Generic)
+import TreeSitter.Haskell qualified as S
+import TreeSitter.Language qualified as S
+
+data Language
+  = Haskell
+  deriving (Eq, Show, Generic, Binary)
+
+fromExtension :: String -> Language
+fromExtension ".hs" = Haskell
+fromExtension ext = throw $ E.UnknownFileExtension ext
+
+-- TODO add languages elm, shell, nix
+parser :: Language -> Ptr S.Language
+parser Haskell = S.tree_sitter_haskell
+
+lineStart :: Language -> T.Text
+lineStart Haskell = "--"
+
+block :: Language -> Maybe ([T.Text], T.Text)
+block Haskell = Just (["{-"], "-}")
+
+nodeTypes :: Language -> [String]
+nodeTypes Haskell = ["comment"]