Re: [Haskell-cafe] api-tools questions

You might also find the keystore[0] package useful as it makes use of this technique in several places. See, for example the definition of Pattern in the `Data.Keystore.Types.Schema`[1] and `Data.Keystore.Types`[2]. Chris [0]-http://hackage.haskell.org/package/keystore [1]-https://github.com/cdornan/keystore/blob/master/src/Data/KeyStore/Types /Schema.hs#L179 [2]-https://github.com/cdornan/keystore/blob/master/src/Data/KeyStore/Types .hs#L68 On 09/09/2014 17:20, "Karsten Gebbert" wrote:

Excellent, thanks a lot Adam. I'll open a PR when I'm through with this project :)

Adam Gundry writes:

...

Hi Karsten,

This isn't very well documented, but there is a (hidden) feature of api-tools that should do what you want. If you say something like

mt :: MyTime = basic string with inj_MyTime, prj_MyTime

then you can define your own type MyTime and give conversion functions inj_MyTime and prj_MyTime to convert back and forth from a newtype-wrapped Text. (In fact, you could probably use UTCTime as MyTime...). More precisely, api-tools will generate something like

newtype REP__MyTime = REP__MyTime Text

and you will need to implement

inj_MyTime :: REP__MyTime -> ParserWithErrs MyTime prj_MyTime :: MyTime -> REP__MyTime

I hope this helps, and further questions or documentation contributions are very welcome!

Cheers,

Adam

On 09/09/14 14:02, Karsten Gebbert wrote:

...

Hi All,

I have a question concerning the api-tools package.

Its not clear from the tests, sources or the tutorial how I can use other date/time formats that the default `utc` type can handle. I'm trying to wrap a JSON API that is not under my control, so I have to adhere to whatever I get back from it. Could anybody with experience with the package point me to some example, relevant bits in the sources or a tip how to do it?

I'm planning to create some more documentation around the package to contribute back once I figured out a few more details, because I think its quite a useful abstraction when dealing with (foreign) APIs IMO.

Thanks already for any hints,

karsten

-- Adam Gundry, Haskell Consultant Well-Typed LLP, http://www.well-typed.com/

---

Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe