allow building with aeson >= 2.0

In aeson 2.0, Text has been replaced by the Key type and HashMap by the
KeyMap interface. Accomodating this required adding some CPP in order to
still be able to compile with aeson < 2.0. The required changes were:

* Prevent Key from being re-exported by Utilities.Aeson, as it clashes
  with git-annex's own Key type.

* Fix up convertion from String/Text to Key (or Text in aeson 1.*) in a
  couple of places

* Import Data.Aeson.KeyMap instead of Data.HashMap.Strict, as they are
  mostly API-compatible. insertWith needs to be replaced by unionWith,
  however, as KeyMap lacks the former function.
This commit is contained in:
sternenseemann 2022-03-02 21:16:10 +01:00 committed by Joey Hess
parent 55f71b0ebd
commit ca596e7c54
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5 changed files with 51 additions and 15 deletions

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@ -7,7 +7,7 @@
- License: BSD-2-clause
-}
{-# LANGUAGE FlexibleInstances, TypeSynonymInstances #-}
{-# LANGUAGE FlexibleInstances, TypeSynonymInstances, CPP #-}
module Utility.Aeson (
module X,
@ -17,7 +17,7 @@ module Utility.Aeson (
packByteString,
) where
import Data.Aeson as X hiding (ToJSON, toJSON, encode)
import Data.Aeson as X hiding (ToJSON, toJSON, encode, Key)
import Data.Aeson hiding (encode)
import qualified Data.Aeson
import qualified Data.Text as T