Add multi-line support to toString support

library/src/main/scala/CodecCodeGen.scala

@@ -284,7 +284,7 @@ class CodecCodeGen(codecParents: List[String],
       s"""${genPackage(s)}
          |trait $name $parents
          |object $name extends $name""".stripMargin
-    val syntheticDefinition = Interface(name, "Scala", None, VersionNumber("0.0.0"), Nil, Nil, Nil, Nil, Nil, None, Nil, Nil, Nil)
+    val syntheticDefinition = Interface(name, "Scala", None, VersionNumber("0.0.0"), Nil, Nil, Nil, Nil, Nil, Nil, Nil, Nil, Nil)
     ListMap(new File(genFile(s, syntheticDefinition).getParentFile, s"$name.scala") -> code)
   }
 

library/src/main/scala/JavaCodeGen.scala

@@ -250,8 +250,8 @@ class JavaCodeGen(lazyInterface: String, optionalInterface: String) extends Code
        |}""".stripMargin
   }
 
-  private def genToString(cl: ClassLike, superFields: List[Field], toString: Option[String]) = {
-    val body = toString getOrElse {
+  private def genToString(cl: ClassLike, superFields: List[Field], toString: List[String]) = {
+    val body = if (toString.isEmpty) {
       val allFields = superFields ++ cl.fields
       if (allFields exists (_.tpe.lzy)) {
         "return super.toString(); // Avoid evaluating lazy members in toString to avoid circularity."
@@ -260,7 +260,7 @@ class JavaCodeGen(lazyInterface: String, optionalInterface: String) extends Code
           s""" + "${f.name}: " + ${f.name}()"""
         }.mkString(s"""return "${cl.name}(" """, " + \", \"", " + \")\";")
       }
-    }
+    } else toString mkString s"$EOL    "
 
     s"""public String toString() {
        |    $body

library/src/main/scala/ScalaCodeGen.scala

@@ -186,8 +186,8 @@ class ScalaCodeGen(scalaArray: String, genFile: Definition => File, sealProtocol
        |}""".stripMargin
   }
 
-  private def genToString(cl: ClassLike, superFields: List[Field], toString: Option[String]) = {
-    val body = toString getOrElse {
+  private def genToString(cl: ClassLike, superFields: List[Field], toString: List[String]) = {
+    val body = if (toString.isEmpty) {
       val allFields = superFields ++ cl.fields
       if (allFields exists (_.tpe.lzy)) {
         s"super.toString // Avoid evaluating lazy members in toString to avoid circularity."
@@ -197,7 +197,7 @@ class ScalaCodeGen(scalaArray: String, genFile: Definition => File, sealProtocol
         val fieldsToString = allFields.map(f => bq(f.name)).mkString(" + ", """ + ", " + """, " + ")
         s""""${cl.name}("$fieldsToString")""""
       }
-    }
+    } else toString mkString s"$EOL  "
 
     s"""override def toString: String = {
        |  $body

library/src/main/scala/SchemaData.scala

@@ -123,7 +123,7 @@ case class Interface(name: String,
   messages: List[Message],
   children: List[Definition],
   extra: List[String],
-  toStringBody: Option[String],
+  toStringBody: List[String],
   extraCompanion: List[String],
   parents: List[String],
   parentsCompanion: List[String]) extends ClassLike
@@ -139,7 +139,7 @@ object Interface extends Parser[Interface] {
       json ->* "messages" map Message.parse,
       json ->* "types" map Definition.parse,
       json multiLineOpt "extra" getOrElse Nil,
-      json ->? "toString",
+      json multiLineOpt "toString" getOrElse Nil,
       json multiLineOpt "extraCompanion" getOrElse Nil,
       json multiLineOpt "parents" getOrElse Nil,
       json multiLineOpt "parentsCompanion" getOrElse Nil)
@@ -162,7 +162,7 @@ case class Record(name: String,
   doc: List[String],
   fields: List[Field],
   extra: List[String],
-  toStringImpl: Option[String],
+  toStringImpl: List[String],
   extraCompanion: List[String],
   parents: List[String],
   parentsCompanion: List[String]) extends ClassLike
@@ -176,7 +176,7 @@ object Record extends Parser[Record] {
       json multiLineOpt "doc" getOrElse Nil,
       json ->* "fields" map Field.parse,
       json multiLineOpt "extra" getOrElse Nil,
-      json ->? "toString",
+      json multiLineOpt "toString" getOrElse Nil,
       json multiLineOpt "extraCompanion" getOrElse Nil,
       json multiLineOpt "parents" getOrElse Nil,
       json multiLineOpt "parentsCompanion" getOrElse Nil)

library/src/test/scala/SchemaSpec.scala

@@ -29,7 +29,7 @@ class SchemaSpec extends FlatSpec {
         (abstractMethods.size === 0) &&
         (children.size === 0) &&
         (extra === List()) &&
-        (toString === None) &&
+        (toString === Nil) &&
         (extraCompanion === Nil) &&
         (parents === Nil) &&
         (parentsCompanion === Nil))
@@ -46,7 +46,7 @@ class SchemaSpec extends FlatSpec {
         (doc === List()) &&
         (fields.size === 0) &&
         (extra === List()) &&
-        (toString === None) &&
+        (toString === Nil) &&
         (extraCompanion === Nil) &&
         (parents === Nil) &&
         (parentsCompanion === Nil))
@@ -85,7 +85,7 @@ class SchemaSpec extends FlatSpec {
         (abstractMethods.size === 0) &&
         (children.size === 0) &&
         (extra === List("// Some extra code...")) &&
-        (toString === Some("return \"custom\";")) &&
+        (toString === List("return \"custom\";")) &&
         (extraCompanion === List("// Some extra companion code...")) &&
         (parents === List("Interface1", "Interface2")) &&
         (parentsCompanion === List("CompanionInterface1", "CompanionInterface2")))
@@ -104,9 +104,9 @@ class SchemaSpec extends FlatSpec {
         (abstractMethods.size === 0) &&
         (children.size === 1) &&
         (children(0) === Record("childRecord", "Scala", None, VersionNumber("0.0.0"), Nil,
-          Field("x", Nil, TpeRef("int", false, false, false), Field.emptyVersion, None) :: Nil, Nil, None, Nil, Nil, Nil)) &&
+          Field("x", Nil, TpeRef("int", false, false, false), Field.emptyVersion, None) :: Nil, Nil, Nil, Nil, Nil, Nil)) &&
         (extra === List()) &&
-        (toString === None) &&
+        (toString === Nil) &&
         (extraCompanion === Nil) &&
         (parents === Nil) &&
         (parentsCompanion === Nil))
@@ -122,9 +122,9 @@ class SchemaSpec extends FlatSpec {
         (fields.size === 0) &&
         (abstractMethods.size === 0) &&
         (children.size === 1) &&
-        (children(0) === Interface("nestedProtocol", "Scala", None, VersionNumber("0.0.0"), Nil, Nil, Nil, Nil, Nil, None, Nil, Nil, Nil)) &&
+        (children(0) === Interface("nestedProtocol", "Scala", None, VersionNumber("0.0.0"), Nil, Nil, Nil, Nil, Nil, Nil, Nil, Nil, Nil)) &&
         (extra === List()) &&
-        (toString === None) &&
+        (toString === Nil) &&
         (extraCompanion === Nil) &&
         (parents === Nil) &&
         (parentsCompanion === Nil))
@@ -141,7 +141,7 @@ class SchemaSpec extends FlatSpec {
         (fields.size === 1) &&
         (fields(0) === Field("field", Nil, TpeRef("java.net.URL", false, false, false), Field.emptyVersion, None)) &&
         (extra === List("// Some extra code...")) &&
-        (toString === None) &&
+        (toString === Nil) &&
         (extraCompanion === Nil) &&
         (parents === Nil) &&
         (parentsCompanion === Nil))

notes/0.2.8/multiline-toString.markdown

@@ -0,0 +1,7 @@
+
+### enhancements
+
+- Adds multi-line support to the custom toString support. [#47][47] by [@dwijnand][@dwijnand]
+
+  [47]: https://github.com/sbt/sbt-datatype/pull/47
+  [@dwijnand]: http://github.com/dwijnand