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add possibility to use → in route pattern, in addition to -> #2109

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merged 2 commits into from Sep 24, 2018

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@fsarradin
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@fsarradin fsarradin commented Sep 24, 2018

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XXX: due to infix operation precedence, → has a lower priority than /.
     So you have to use parentheses in pattern matching when using this
     operator.
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@fsarradin fsarradin commented Sep 24, 2018

XXX: due to infix operation precedence, → has a lower priority than /. So you have to use parentheses in pattern matching when using this operator.

So this works

  case GET  (Root / "test.json") =>

And, this won't

  case GET  Root / "test.json" =>

It gives you something like this

constructor cannot be instantiated to expected type;
 found   : org.http4s.dsl.impl./
 required: org.http4s.Request[cats.effect.IO]
        case GET → Root / "test.json" => true
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@rossabaker rossabaker commented Sep 24, 2018

Do you still like the feature, given the limitation?

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@fsarradin fsarradin commented Sep 24, 2018

Yes, cause on another I use a rule to rewrite -> into . And, in a sense, parentheses help to have a better delimitation between method and path 😊

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@rossabaker rossabaker left a comment

If you're on the 0.18 series, we could retarget this for release-0.18.x and get it in a patch sooner. Otherwise, we can target this for the 0.19 series.

👍 after we add a note to that operator.

@@ -17,6 +17,7 @@ trait Http4sDsl[F[_]] extends Http4s with Methods with Statuses with Responses[F
val :? : impl.:?.type = impl.:?
val ~ : impl.~.type = impl.~
val -> : impl.->.type = impl.->
val : impl.->.type = impl.->

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I'd put a scaladoc on this to note the precedence issue. It's obvious when you mention it, but I didn't think about it beforehand.

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@fsarradin fsarradin commented Sep 24, 2018

scaladoc added.

And I'm currently using the 0.19 series :)

@rossabaker rossabaker added this to the 0.19.0-M3 milestone Sep 24, 2018
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@rossabaker rossabaker left a comment

👍 Thanks!

@jmcardon jmcardon merged commit 0da0ec1 into http4s:master Sep 24, 2018
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4 participants