Cli tool compiles to 0.17 and doesn't include imports

[MarcCoquand]

When trying to compile a json file with the following command

python json-to-elm/generate.py src/shared/person.json > src/client/decoders/Person.elm

It generates the following:

type alias Person =
    { name : String
    , age : Int
    , location : PersonLocation
    }

type alias PersonLocation =
    { name : String
    , days : Int
    }

decodePerson : Json.Decode.Decoder Person
decodePerson =
    Json.Decode.succeed Person
        |: ("name" := Json.Decode.string)
        |: ("age" := Json.Decode.int)
        |: ("location" := decodePersonLocation)

decodePersonLocation : Json.Decode.Decoder PersonLocation
decodePersonLocation =
    Json.Decode.succeed PersonLocation
        |: ("name" := Json.Decode.string)
        |: ("days" := Json.Decode.int)

encodePerson : Person -> Json.Encode.Value
encodePerson record =
    Json.Encode.object
        [ ("name",  Json.Encode.string <| record.name)
        , ("age",  Json.Encode.int <| record.age)
        , ("location",  encodePersonLocation <| record.location)
        ]

encodePersonLocation : PersonLocation -> Json.Encode.Value
encodePersonLocation record =
    Json.Encode.object
        [ ("name",  Json.Encode.string <| record.name)
        , ("days",  Json.Encode.int <| record.days)
        ]

whereas I would expect it to compile to the latest version as follows:

import Json.Encode
import Json.Decode
import Json.Decode.Pipeline

type alias Person =
    { name : String
    , age : Int
    , location : PersonLocation
    }

type alias PersonLocation =
    { name : String
    , days : Int
    }

decodePerson : Json.Decode.Decoder Person
decodePerson =
    Json.Decode.Pipeline.decode Person
        |> Json.Decode.Pipeline.required "name" (Json.Decode.string)
        |> Json.Decode.Pipeline.required "age" (Json.Decode.int)
        |> Json.Decode.Pipeline.required "location" (decodePersonLocation)

decodePersonLocation : Json.Decode.Decoder PersonLocation
decodePersonLocation =
    Json.Decode.Pipeline.decode PersonLocation
        |> Json.Decode.Pipeline.required "name" (Json.Decode.string)
        |> Json.Decode.Pipeline.required "days" (Json.Decode.int)

encodePerson : Person -> Json.Encode.Value
encodePerson record =
    Json.Encode.object
        [ ("name",  Json.Encode.string <| record.name)
        , ("age",  Json.Encode.int <| record.age)
        , ("location",  encodePersonLocation <| record.location)
        ]

encodePersonLocation : PersonLocation -> Json.Encode.Value
encodePersonLocation record =
    Json.Encode.object
        [ ("name",  Json.Encode.string <| record.name)
        , ("days",  Json.Encode.int <| record.days)
        ]

or at least add options to include imports and which version to compile to.