.

fansi/src/fansi/Fansi.scala

@@ -22,7 +22,7 @@ import scala.collection.mutable
   * giving 20% (on `++`) to >1000% (on `splitAt`, `subString`
   * and `Str.parse`) speedups
   */
-case class Str private(private val chars: Array[Char], private val colors: Array[Str.State]) {
+class Str private(private val chars: Array[Char], private val colors: Array[Str.State]) {
   require(chars.length == colors.length)
   override def hashCode() = util.Arrays.hashCode(chars) + util.Arrays.hashCode(colors)
   override def equals(other: Any) = other match{
@@ -42,7 +42,7 @@ case class Str private(private val chars: Array[Char], private val colors: Array
     System.arraycopy(colors, 0, colors2, 0, length)
     System.arraycopy(other.colors, 0, colors2, length, other.length)
 
-    Str(chars2, colors2)
+    new Str(chars2, colors2)
   }
 
   /**
@@ -335,7 +335,7 @@ object Str{
       }
     }
 
-    Str(
+    new Str(
       util.Arrays.copyOfRange(chars, 0, destIndex),
       util.Arrays.copyOfRange(colors, 0, destIndex)
     )
@@ -354,7 +354,10 @@ object Str{
     new fansi.Str(chars.clone(), colors.clone())
   }
 
-  def join(args: Str*) = {
+  def apply(args: Str*) = {
+    join(args)
+  }
+  def join(args: TraversableOnce[Str]) = {
     val length = args.iterator.map(_.length).sum
     val chars = new Array[Char](length)
     val colors = new Array[State](length)

fansi/test/src/fansi/FansiTests.scala

@@ -43,8 +43,14 @@ object FansiTests extends TestSuite{
 
       assert(concated == expected)
     }
+    test("apply"){
+      val concated = fansi.Str(fansi.Str(rgbOps), fansi.Str(rgbOps)).render
+      val expected = rgbOps ++ RTC ++ rgbOps ++ RTC
+
+      assert(concated == expected)
+    }
     test("join"){
-      val concated = fansi.Str.join(fansi.Str(rgbOps), fansi.Str(rgbOps)).render
+      val concated = fansi.Str.join(Seq(fansi.Str(rgbOps), fansi.Str(rgbOps))).render
       val expected = rgbOps ++ RTC ++ rgbOps ++ RTC
 
       assert(concated == expected)