extract common scala docstring printers part

mtags/src/main/scala/scala/meta/internal/metals/Docstrings.scala

@@ -21,10 +21,10 @@ import scala.meta.internal.semanticdb.SymbolInformation
 import scala.meta.internal.semanticdb.SymbolOccurrence
 import scala.meta.io.AbsolutePath
 import scala.meta.pc.ContentType
-import scala.meta.pc.ParentSymbols
-import scala.meta.pc.SymbolDocumentation
 import scala.meta.pc.ContentType.MARKDOWN
 import scala.meta.pc.ContentType.PLAINTEXT
+import scala.meta.pc.ParentSymbols
+import scala.meta.pc.SymbolDocumentation
 
 /**
  * Implementation of the `documentation(symbol: String): Option[SymbolDocumentation]` method in `SymbolSearch`.
@@ -183,7 +183,7 @@ class Markdown(val text: String) extends AnyVal with Content
 class Plain(val text: String) extends AnyVal with Content
 
 object Content {
-  def from(text: String, contentType: ContentType) =
+  def from(text: String, contentType: ContentType): AnyVal with Content =
     contentType match {
       case MARKDOWN => new Markdown(text)
       case PLAINTEXT => new Plain(text)

mtags/src/main/scala/scala/meta/internal/metals/JavadocIndexer.scala

@@ -6,7 +6,7 @@ import scala.util.control.NonFatal
 
 import scala.meta.inputs.Input
 import scala.meta.inputs.Position
-import scala.meta.internal.docstrings.MarkdownGenerator
+import scala.meta.internal.docstrings.printers.MarkdownGenerator
 import scala.meta.internal.jdk.CollectionConverters._
 import scala.meta.internal.mtags.JavaMtags
 import scala.meta.internal.semanticdb.Scala.Descriptor

mtags/src/main/scala/scala/meta/internal/metals/ScaladocIndexer.scala

@@ -31,6 +31,12 @@ class ScaladocIndexer(
       sinfo: SymbolInformation,
       owner: String
   ): Unit = {
+    val printer =
+      contentType match {
+        case MARKDOWN => printers.MarkdownGenerator
+        case PLAINTEXT => printers.PlaintextGenerator
+      }
+
     val docstring = currentTree.origin match {
       case ScalametaCompat.ParsedOrigin(start, _) =>
         val leadingDocstring =
@@ -47,23 +53,12 @@ class ScaladocIndexer(
     // Register `@define` macros to use for expanding in later docstrings.
     defines ++= ScaladocParser.extractDefines(docstring)
     val comment = ScaladocParser.parseComment(docstring, defines)
-    val docstringContent =
-      contentType match {
-        case MARKDOWN =>
-          MarkdownGenerator.toMarkdown(comment, docstring)
-        case PLAINTEXT =>
-          PlaintextGenerator.toPlaintext(comment, docstring)
-      }
+    val docstringContent = printer.toText(comment, docstring)
     def param(name: String, default: String): SymbolDocumentation = {
       val paramDoc = comment.valueParams
         .get(name)
         .orElse(comment.typeParams.get(name))
-        .map { body =>
-          contentType match {
-            case MARKDOWN => MarkdownGenerator.toMarkdown(body)
-            case PLAINTEXT => PlaintextGenerator.toPlaintext(body)
-          }
-        }
+        .map(printer.toText)
         .getOrElse("")
       MetalsSymbolDocumentation(
         Symbols.Global(owner, Descriptor.Parameter(name)),