typelevel / cats-time Goto Github PK

https://docs.oracle.com/javase/8/docs/api/java/time/MonthDay.html

Christopher, Thanks so much for creating this and several other pure FP libraries. Would you be open to listing them on cats homepage for easier discovery?

According to the request from @armanbilge we need to migrate to sbt-typelevel.

Documentation is available here:
https://github.com/typelevel/sbt-typelevel/#readme

it would be nice to have Timestamp and Date instances. I tentatively implemented in my hobby project: https://github.com/chenharryhua/nanjin/blob/master/datetime/src/main/scala/com/github/chenharryhua/nanjin/datetime/DateTimeInstances.scala#L12

happy to raise a pull request if you're OK with that.

It would be nice to use TimeArbitraries outside cats-time. Perhaps it could use the testkit style to make it importable
Thanks

I get this when trying to access the microsite https://christopherdavenport.github.io/cats-time/

I believe that these projects should offer a friendly and safe space for working together. I am in the process of adding this to most of my libraries.

If you have comments to this regard, I would like to hear them and this issue will be a good place to field such discussions.

Is there a reason that there's no Year instances or just oversight? I could create a quick PR if that's wanted :)

As far as I've understood scala-native was introduced in 0.5.1, according to the version mapping

lazy val commonNativeSettings = Seq(
  tlVersionIntroduced := List("2.12", "2.13", "3").map(_ -> "0.5.1").toMap
)

It would be great to make a fresh release of this lib, with the respective scala-native support.

• I had some issues with 0.4.7 sbt-scala-native plugin, maybe worth downgrading to 0.4.5

It seems my instances for ZoneId and ZoneOffset are slightly broken. When importing io.chrisdavenport.cats.time.instances.all._, I get a conflict when trying to show a ZoneOffset:

scala> show"${ZoneOffset.UTC}"
<console>:22: error: type mismatch;
 found   : java.time.ZoneOffset
 required: cats.Show.Shown
       show"${ZoneOffset.UTC}"
                         ^

This arises because there are two overlapping instances for ContravariantShow[-T]:

scala> Show.Shown.mat(ZoneOffset.UTC)
<console>:22: error: ambiguous implicit values:
 both value zoneidInstances in trait zoneid of type => cats.Show[java.time.ZoneId] with cats.Eq[java.time.ZoneId] with cats.Hash[java.time.ZoneId]
 and value zoneoffsetInstances in trait zoneoffset of type => cats.Show[java.time.ZoneOffset] with cats.Order[java.time.ZoneOffset] with cats.Hash[java.time.ZoneOffset]
 match expected type cats.Show.ContravariantShow[java.time.ZoneOffset]
       Show.Shown.mat(ZoneOffset.UTC)
                     ^

, and the compiler can't choose a better one.

I'm not sure what would be the best course of action here. Removing Show[ZoneOffset] would fix interpolation, however most of generic code I've seen relies directly on Show!

We should make a release with the changes in particular Scala 3 supooet and the change of the modules
I'll try to produce a RC to test the waters