Add aliases for common hints

README.md

@@ -34,9 +34,11 @@ You'll typically need the following imports to use the derivation :
 ```scala
 import smithy4s.*
 import smithy4s.deriving.{given, *}
+import smithy4s.deriving.aliases.* // for syntactically pleasant annotations
+import scala.annotation.experimental // the derivation of API uses experimental metaprogramming features, at this time.
+
 import smithy.api.* // if you want to use hints from the official smithy standard library
 import alloy.* // if you want to use hints from the alloy library
-import scala.annotation.experimental // the derivation of API uses experimental metaprogramming features, at this time.
 ```
 
 
@@ -281,6 +283,21 @@ operation hello {
 * Defaults are supported
 * Scaladoc is converted to `@documentation` hints
 
+## More concise annotations
+
+To reduce the verbosity induced by the `hints` annotation, it is possible to define custom annotations that create the responsibility of
+creating hints, as such :
+
+```scala
+import smithy4s.Hints
+import smithy4s.deriving.HintsProvider
+
+case class httpGet(uri: String, status: Int) extends HintsProvider {
+  def hints = Hints(Http(NonEmptyString("GET"), NonEmptyString(uri), status))
+}
+```
+
+A few of these more-concise annotations are provided out-of-the-box in the `smithy4s.deriving.aliases` package.
 
 ## Difference between smithy4s.deriving.API and and smithy4s.Service
 

modules/core/shared/src/main/scala/smithy4s/deriving/aliases/aliases.scala

@@ -0,0 +1,77 @@
+package smithy4s.deriving.aliases
+
+import smithy4s.Hints
+import smithy4s.deriving.HintsProvider
+import smithy.api.*
+import alloy.Discriminated
+import alloy.Untagged
+import alloy.SimpleRestJson
+import alloy.proto.ProtoIndex
+
+case class httpGet(uri: String, code: Int = 200) extends HintsProvider {
+  def hints = Hints(Http(NonEmptyString("GET"), NonEmptyString(uri), code))
+}
+
+case class httpPost(uri: String, code: Int = 200) extends HintsProvider {
+  def hints = Hints(Http(NonEmptyString("POST"), NonEmptyString(uri), code))
+}
+
+case class httpPatch(uri: String, code: Int = 200) extends HintsProvider {
+  def hints = Hints(Http(NonEmptyString("PATCH"), NonEmptyString(uri), code))
+}
+
+case class httpDelete(uri: String, code: Int = 200) extends HintsProvider {
+  def hints = Hints(Http(NonEmptyString("DELETE"), NonEmptyString(uri), code))
+}
+
+case class httpPut(uri: String, code: Int = 200) extends HintsProvider {
+  def hints = Hints(Http(NonEmptyString("PUT"), NonEmptyString(uri), code))
+}
+
+case class httpLabel() extends HintsProvider {
+  def hints = Hints(HttpLabel())
+}
+
+case class httpQuery(name: String) extends HintsProvider {
+  def hints = Hints(HttpQuery(name))
+}
+
+case class httpHeader(name: String) extends HintsProvider {
+  def hints = Hints(HttpHeader(name))
+}
+
+case class httpPayload() extends HintsProvider {
+  def hints = Hints(HttpPayload())
+}
+
+case class httpError(code: Int) extends HintsProvider {
+  def hints = Hints(HttpError(code))
+}
+
+case class readonly() extends HintsProvider {
+  def hints = Hints(Readonly())
+}
+
+case class idempotent() extends HintsProvider {
+  def hints = Hints(Idempotent())
+}
+
+case class jsonName(name: String) extends HintsProvider {
+  def hints = Hints(JsonName(name))
+}
+
+case class simpleRestJson() extends HintsProvider {
+  def hints = Hints(SimpleRestJson())
+}
+
+case class discriminated(fieldName: String) extends HintsProvider {
+  def hints = Hints(Discriminated(fieldName))
+}
+
+case class untagged() extends HintsProvider {
+  def hints = Hints(Untagged())
+}
+
+case class protoIndex(value: Int) extends HintsProvider {
+  def hints = Hints(ProtoIndex(value))
+}

modules/core/shared/src/main/scala/smithy4s/deriving/annotations.scala

@@ -22,6 +22,17 @@ import smithy4s.{Hint, Hints}
 abstract class HintsProvider extends MetaAnnotation {
   def hints: Hints
 }
+
+/**
+  * Allows to capture any value the type of which has a `smithy4s.ShapeTag` instance, as a hint.
+  * The values are typically generated by `Smithy4s` from smithy shapes.
+  *
+  * See https://smithy.io/2.0/trait-index.html for the official list of traits. Smithy4s bundled generated data-types
+  * for each of them.
+  *
+  * See https://github.com/disneystreaming/alloy/ for the companion library of smithy traits that Smithy4s also bundles
+  * generated datatypes for.
+  */
 case class hints(first: Hint, others: Hint*) extends HintsProvider {
   def hints: Hints = Hints.fromSeq(first +: others)
 }

modules/core/shared/src/main/scala/smithy4s/deriving/internals/macros.scala

@@ -309,10 +309,9 @@ private def altsExpression[T: Type](
 
 private def operationHints(annotations: List[Expr[Any]])(using Quotes): Expr[Hints] =
   annotations
-    .collectFirst { case '{ $smithyAnnotation: HintsProvider } =>
-      '{ $smithyAnnotation.hints }
-    }
-    .getOrElse('{ Hints.empty })
+    .collect { case '{ $smithyAnnotation: HintsProvider } => '{ $smithyAnnotation.hints }}
+    .fold('{Hints.empty}){ case (left, right) => '{$left ++ $right}}
+
 
 private def paramHintsMap(using Quotes)
   (annotations: List[List[Expr[Any]]], labels: List[String], paramDocs: Map[String, String], paramSymbols: List[quotes.reflect.Symbol]): Map[String, Expr[Hints]] = {

modules/examples/shared/src/main/scala/model.scala

@@ -18,30 +18,25 @@ package examples
 
 import smithy4s.*
 import smithy4s.deriving.{given, *}
-import smithy.api.*
-import alloy.*
+import smithy4s.deriving.aliases.*
 import cats.effect.IO
 import scala.annotation.experimental
 
-// Just making it simpler to construct hints
-given [A, B](using Bijection[A, B]): Conversion[A, B] with {
-  def apply(a: A): B = summon[Bijection[A, B]](a)
-}
-
-@hints(HttpError(503))
+@httpError(503)
 case class LocationNotRecognised(errorMessage: String) extends Throwable derives Schema {
   override def getMessage(): String = errorMessage
 }
 
 @experimental
-@hints(SimpleRestJson())
+@simpleRestJson
 class HelloWorldService() derives API {
 
   @errors[LocationNotRecognised]
-  @hints(Http(method = "GET", uri = "/hello/{name}"), Readonly())
+  @readonly
+  @httpGet("/hello/{name}")
   def hello(
-      @hints(HttpLabel()) name: String,
-      @hints(HttpQuery("from")) from: Option[String]
+      @httpLabel() name: String,
+      @httpQuery("from") from: Option[String]
   ): IO[String] = from match {
     case None                       => IO(s"Hello $name!")
     case Some(loc) if loc.isEmpty() => IO.raiseError(LocationNotRecognised("Empty location"))