debug-print

Offers ToDebugPrintValue, a structured alternative to Show for printing values for testing and debugging purposes.

import DebugPrint
import DebugPrint.Aeson
import Data.Aeson qualified as Aeson

data Report = Report
  { milliseconds :: Int
  , errors :: [Text]
  , fileName :: Maybe Text
  }
  deriving stock Generic
  deriving anyclass (ToDebugPrintRecord, ToDebugPrintValue)

report :: Report
report = Report{ milliseconds = 5_824
                , errors = ["Warning! Problems."]
                , fileName = Nothing }

main :: IO ()
main = hspec $ do
  it "" $ do
    Aeson.encode (debugPrintValueToAeson report) `shouldBe`
      "{\"errors\":[\"Warning! Problems.\"],\"milliseconds\":5824}"

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