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A mini Scala utility library

License: Apache License 2.0

Scala 99.18% Shell 0.82%
functional-programming union-types monad-transformers minimal enums validation error-handling typeclass

hamsters's People

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hamsters's Issues

Case class <-> HList conversions

@Gen
case class User(firstName : String, lastName : String)

We could generate a companion object with methods :
implicit def toHlist(user) : String :: String :: HNil=???
implicit def fromHlist(v : String :: String :: HNil) : User=???

Too much transitive dependencies

If i create an empty project and make
sbt clean && sbt clean && sbt assembly && ls -lah target/scala-2.12/*.jar

I get a weight :

libraryDependencies += "io.github.scala-hamsters" %% "hamsters" % "1.5.1" => 14Mo
libraryDependencies += "com.chuusai" %% "shapeless" % "2.3.2" => 7.7 Mo
libraryDependencies += "org.scalaz" %% "scalaz-core" % "7.2.16" => 13.1Mo

Our dependencies depends of scala.meta, it should be a provided depency

Typo in dependency

There is a typo in the dependency, it should be:

libraryDependencies ++= Seq(
  "io.github.scala-hamsters" %% "hamsters" % "1.0.0-SNAPSHOT",
)

Dependency version incorrect in readme

The dependency version is not correct in the readme, it states:

libraryDependencies ++= Seq(
  "io.github.scala-hamsters" %% "hamsters" % "1.0-BETA1"
)

but it should be:

libraryDependencies ++= Seq(
  "io.github.scala-hamsters" %% "hamsters" % "1.0.0-BETA1"
)

Please change 1.0-BETA1 to 1.0**.0**-BETA1

DefaultValue for Numeric is unsound

scala> implicitly[DefaultValue[BigDecimal]].get
java.lang.ClassCastException: java.lang.Integer cannot be cast to scala.math.BigDecimal
  ... 38 elided

You need to use the .zero member of Numeric[T] instead of trying to cast 0.

Build Validation from List

Hello,

Is there a reason why we can not build a Validation from list through apply() method as

Validation(List(Ok, KO, KO))

Currently, I have to use Traditional approach with the new operator.
We could add the apply(l:List) in companion object of Validation class, what do you think about it ?

Many thanks for you help,

Fabrice

Implement orEmpty for Option[T]

val stringOpt: Option[String] = None
stringOpt.orEmpty // ""

val intOpt: Option[Int] = None
intOpt.orEmpty // 0

val listOpt: Option[List[Int]] = None
listOpt.orEmpty // List()

Add documentation for mapN

Documentation should explain how to use it with option and list and how to extend to other types with the right implicit definitions.

Make pattern matching possible in for-comprehensions using monad transformers

Current state of FutureOption and FutureEither does not allow pattern matching in for-comprehensions.

For example, the following wouldn't compile :

def foa: Future[Option[String]] = Future(Some(("a", 42)))

val composedAB: Future[Option[Int]] = (for {
  (a, i) <- FutureOption(foa) if i > 5
} yield a).future

This would be solved by implementing withFilter in both classes

add to maven central

to enable usage in maven-projects, it would be really useful to add this library to maven central

Find a way to retrieve types values of different types in Validation

In a Validation, there only 1 error type, but valid data can have different types.
It would be great to have a way to retrieve all valid data, for example something like :

val e1 = OK("1")
val e2 = OK(2)
val e3 = OK(3)
val validation = Validation(e1,e2, e3)

validation.map(_ + _ + _) // Validation("123")
validation.getOrElse("failure")//123

map should be triggered only if all eithers are valid.

HList : Wrong type returned by compiler with ++ function

This is working :

val sum = (2.0 :: "hi" :: HNil) ++ (1 :: HNil)    
sum shouldBe 2.0 :: "hi" :: 1 :: HNil
sum shouldBe a[HCons[_, HCons[_, HCons[_, HNil]]]]

Folding/Iterating on sum content works as expected :

sum.foreach(println)

Result :

// 2.0
// hi
// 1

But this fails :

sum.tail.tail.head 

--> compilation error : value head is not a member of io.github.hamsters.HNil
We can see with the first test that sum.tail.tail is a HCons but the compiler returns a HNIL because ++ keeps the type of the first HList, HCons[_, HCons[_, HNil]]] in this example instead of [HCons[_, HCons[_, HCons[_, HNil]]]].

cross build is broken

sbt +test should run tests in scala 2.11 and scala 2.12.
Since last merge (scala.js branch) only 2.11 seems to be run.
Same issue occurs with sbt +publishSigned.

Generate def list of Enumerable with a macro

For now, you need to explicitly and manually write the following method

implicit val seasonEnumerable = new Enumerable[Season] {
  override def list: List[Season] = List(Winter, Spring, Summer, Fall)
}

What's happen when i add another value.
If we generate this method with a macro (annotation vs def macros...), that could help.

HList map and filter can't return a more precise type than HList

It's a problem if you need to type check the content of the resulting HList, for example if it's returned by a method.
So we may enhance the map/filter methods but only if it is possible to keep a (quite) simple HList model.
For more advanced Hlist features, people should use Shapeless instead.
In the same time, +++ private method in HCons could be removed in favor of ++

Implement Show typeclass

The goal is to automatically provide a better toString for case classes with field names.

Example :

case class Person(name: String, age: Int)
implicit personShow = ... // calling macro here
val p = Person("bob", 40)
Show.show(p) // returns  "Person(name = bob, age = 40)"
//or 
// import implicit class
p.show // returns  "Person(name = bob, age = 40)"

Enumerable.parse should compare string in the same case

trait Enumerable[A] {
  def name(a: A): String = a.toString.toLowerCase
  def parse(s: String): Option[A] = list.find(a => name(a) == s)
  def list: List[A]
}

should become

trait Enumerable[A] {
  def name(a: A): String = a.toString.toLowerCase
  def parse(s: String): Option[A] = list.find(a => name(a).equalsIgnoreCase(s))
  def list: List[A]
}

Simplify release process

It would be nice to be able to automatically :

  1. deploy to sonatype
  2. update Readme
  3. update REPL script to use the latest version
  4. create git tag

Implement wait in retry

Add another method like this :

def apply[T](maxRetries: Int, waitInMilliSeconds: Int, errorFn: (String) => Unit = _=> Unit)(fn: => T): Future[T]

Future will be used to avoid blocking in the main thread

Retry.withWait should use scala.concurrent.blocking

Hello all,

Thanks all for this lib, keep it up!

Retry.withWait could wrap the Thread.sleep inside a blocking block, which warns the global execution context (so that it might add more threads).

Also I'd appreciate make it clearer in the docs that the method blocks a Thread.

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