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module History.Cache (cached) where
import Data.Binary (Binary, decodeFileOrFail, encodeFile)
import Data.Text qualified as T
import Git qualified
import System.Directory (createDirectoryIfMissing, doesFileExist)
import System.FilePath ((</>))
cached :: Binary a => T.Text -> (T.Text -> IO a) -> IO a
cached hash func = do
root <- Git.getRootDir
createDirectoryIfMissing True (root </> ".anissue")
let file = (root </> ".anissue" </> T.unpack hash)
doesFileExist file >>= \case
True ->
decodeFileOrFail file >>= \case
Left _ -> generate file
Right blob -> pure blob
False -> generate file
where
generate file = do
blob <- func hash
encodeFile file blob
pure blob
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