Add using keyword to scala3doc and hide synthetic names

Author: BarkingBad

scala3doc-testcases/src/tests/using.scala

@@ -0,0 +1,15 @@
+package tests
+package usings
+
+class Named
+class ClassTag[T]
+given ClassTag[Int] = ClassTag[Int]
+given ClassTag[String] = ClassTag[String]
+
+/** ...
+ *
+ *  @param t: this is an explicit parameter
+ *  @param named: this is an implicit paramter
+ *  @param ClassTag[String]: this is next implicit parameter
+ */
+def f[T](t: T)(using ClassTag[Int])(using ClassTag[String])(using named: Named)(using ClassTag[T]): Unit = ???

scala3doc/src/dotty/dokka/model/api/api.scala

@@ -101,7 +101,7 @@ object Annotation:
 case class Parameter(
   annotations: Seq[Annotation],
   modifiers: String,
-  name: String,
+  name: Option[String],
   dri: DRI,
   signature: Signature,
   isExtendedSymbol: Boolean = false,

scala3doc/src/dotty/dokka/tasty/ClassLikeSupport.scala

@@ -376,12 +376,13 @@ trait ClassLikeSupport:
     isExtendedSymbol: Boolean = false,
     isGrouped: Boolean = false) =
       val inlinePrefix = if argument.symbol.flags.is(Flags.Inline) then "inline " else ""
-      // TODO (https://github.com/lampepfl/dotty/issues/10525): Add using flag
+      val usingPrefix = if argument.symbol.flags.is(Flags.Given) then "using " else ""
+      val name = Option.when(!argument.symbol.flags.is(Flags.Synthetic))(argument.symbol.normalizedName)
 
       Parameter(
         argument.symbol.getAnnotations(),
-        inlinePrefix + prefix(argument.symbol),
-        argument.symbol.normalizedName,
+        inlinePrefix + usingPrefix + prefix(argument.symbol),
+        name,
         argument.symbol.dri,
         argument.tpt.dokkaType.asSignature,
         isExtendedSymbol,
@@ -464,4 +465,4 @@ trait ClassLikeSupport:
         ctx.sourceSet.toSet,
         /*isExpectActual =*/ false,
         PropertyContainer.Companion.empty().plus(member.copy(rawDoc = symbol.documentation2)).plus(compositeExt)
-    )
+    )

scala3doc/src/dotty/dokka/translators/ScalaSignatureUtils.scala

@@ -86,11 +86,10 @@ trait SignatureBuilder extends ScalaSignatureUtils {
       else if params == List(Nil) then this.text("()")
       else this.list(params, separator = ""){ (bld, pList) =>
         bld.list(pList, "(", ")"){ (bld, p) =>
-            bld.annotationsInline(p)
+            val annotationsAndModifiers = bld.annotationsInline(p)
               .text(p.modifiers)
-              .memberName(p.name, p.dri)
-              .text(": ")
-              .signature(p.signature)
+            val name = p.name.fold(annotationsAndModifiers)(annotationsAndModifiers.memberName(_, p.dri).text(": "))
+            name.signature(p.signature)
         }
       }
 }