36 lines
1.2 KiB
Haskell
36 lines
1.2 KiB
Haskell
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{-# LANGUAGE OverloadedStrings #-}
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import Data.Aeson (Value(..), decode)
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import Data.Aeson.Key (Key, toString)
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import Data.Aeson.KeyMap (foldMapWithKey)
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import Data.Aeson.Parser (json')
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import Data.Aeson.Types (parse)
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import Data.String (fromString)
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import Data.Text (Text(..), unpack, replace, isInfixOf)
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import Data.Vector (Vector)
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import Data.Maybe (fromMaybe)
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main :: IO ()
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main = interact f
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where
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f input = case decode $ fromString input of
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Nothing -> "json2nix error - could not parse input\n" ++ show input
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Just jsonValue -> json2Nix jsonValue
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keyValToString :: Key -> Value -> String
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keyValToString key value = toString key ++ " = " ++ json2Nix value ++ ";"
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-- escapeDollar :: Text -> Text
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-- escapeDollar = replace "''${" "\\''${"
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json2Nix :: Value -> String
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json2Nix (Object object) = "{" ++ foldMapWithKey keyValToString object ++ "}"
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json2Nix (Array array) = "[" ++ foldr (\x y -> x ++ " " ++ y) "" (fmap json2Nix array) ++ "]"
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json2Nix (Number n) = show n
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json2Nix (Bool False) = "false"
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json2Nix (Bool True) = "true"
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json2Nix Null = "null"
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json2Nix (String text) = sep ++ unpack text ++ sep
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where
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sep = if "\"" `isInfixOf` text then "\'\'" else "\""
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