Render multi-line options correctly

modules/core/src/main/scala/InteractiveSingleChoice.scala

@@ -23,6 +23,7 @@ private[cue4s] class InteractiveSingleChoice(
     out: Output,
     theme: Theme,
     windowSize: Int,
+    width: Int,
     symbols: Symbols,
 ) extends PromptFramework[String](terminal, out):
   import InteractiveSingleChoice.*
@@ -31,6 +32,8 @@ private[cue4s] class InteractiveSingleChoice(
 
   private lazy val altsWithIndex = alts.zipWithIndex
   private lazy val altMapping    = altsWithIndex.map(_.swap).toMap
+  private lazy val preSplitMapping =
+    altMapping.view.mapValues(TextSplitter.split(_, width)).toMap
 
   override def initialState = State(
     text = "",
@@ -75,6 +78,24 @@ private[cue4s] class InteractiveSingleChoice(
 
   import theme.*
 
+  def prefixed(lab: (Symbols => String) | String, text: String): String =
+    lab match
+      case f: (Symbols => String) => "  " + f(symbols) + " " + text
+      case s: String              => "  " + s + text
+
+  def prefixed(
+      lab: (Symbols => String) | String,
+      text: List[String],
+  ): List[String] =
+    var i      = 0
+    val indent = " " * prefixed(lab, "").length
+    text.map: l =>
+      i += 1
+      if i == 1 then prefixed(lab, l)
+      else indent + l
+
+  end prefixed
+
   override def renderState(
       st: State,
       status: Status,
@@ -104,16 +125,20 @@ private[cue4s] class InteractiveSingleChoice(
               .zipWithIndex
               .foreach:
                 case (id, idx) =>
-                  val alt = altMapping(id)
-                  lines.addOne(
-                    if id == selected then s"  $altCursor $alt".focused
+                  val text = preSplitMapping(id)
+                  lines.addAll(
+                    if id == selected then
+                      prefixed(
+                        _.altCursor,
+                        text,
+                      ).map(_.focused)
                     else if st.display.windowStart > 0 && idx == 0 then
-                      s"  $pageUpArrow $alt".option
+                      prefixed(_.pageUpArrow, text).map(_.option)
                     else if filtered.size > st.display.windowSize &&
                       idx == st.display.windowSize - 1 &&
                       filtered.indexOf(id) != filtered.size - 1
-                    then s"  $pageDownArrow $alt".option
-                    else s"    $alt".option,
+                    then prefixed(_.pageDownArrow, text).map(_.option)
+                    else prefixed("  ", text).map(_.option),
                   )
         end match
       case Status.Finished(value) =>

modules/core/src/main/scala/Prompt.scala

@@ -231,6 +231,7 @@ object Prompt:
       private val lab: String,
       private val alts: List[String],
       private val windowSize: Int = 10,
+      private val width: Int = 50,
   ) extends Prompt[String]:
 
     def withWindowSize(i: Int) = copy(windowSize = i)
@@ -248,6 +249,7 @@ object Prompt:
         out = output,
         theme = theme,
         windowSize = this.windowSize,
+        width = this.width,
         symbols = symbols,
       )
   end SingleChoice

modules/core/src/main/scala/TextSplitter.scala

@@ -0,0 +1,36 @@
+package cue4s
+
+import scala.collection.mutable.ListBuffer
+
+object TextSplitter:
+
+  def split(s: String, max: Int): List[String] =
+
+    val lines       = List.newBuilder[String]
+    val currentLine = ListBuffer.empty[String]
+
+    val words = s.split(" ")
+
+    inline def recordLine() =
+      if currentLine.nonEmpty then
+        lines += currentLine.mkString(" ")
+        currentLine.clear()
+
+    var curWidth = 0
+    words.foreach: word =>
+      if curWidth < max then
+        currentLine += word
+        curWidth += word.length + (if currentLine.isEmpty then 0 else 1)
+      else
+        recordLine()
+        currentLine += word
+        curWidth = word.length
+      end if
+
+    recordLine()
+
+    lines.result()
+
+  end split
+
+end TextSplitter

modules/core/src/test/scala/FallbackRenderingTests.scala

@@ -1,7 +1,6 @@
 package cue4s
 
 import cue4s.*
-import cue4s.Prompt.PasswordInput.Password
 
 import KeyEvent.*
 

modules/core/src/test/scala/TextSplitterTests.scala

@@ -0,0 +1,16 @@
+package cue4s
+
+class TextSplitterTests extends munit.FunSuite:
+  test("splitting") {
+    val splitter = TextSplitter
+    val text     = "hello world, I say"
+    val result   = splitter.split(text, 5)
+    assertEquals(result, List("hello", "world,", "I say"))
+
+    assertEquals(splitter.split(text, text.length), List(text))
+
+    assertEquals(splitter.split("", 0), List(""))
+    assertEquals(splitter.split("hello", 5), List("hello"))
+    assertEquals(splitter.split("hello", 3), List("hello"))
+  }
+end TextSplitterTests

modules/example/src/main/scala-jvm-native/sync.scala

@@ -34,7 +34,7 @@ import cue4s.Prompt.PasswordInput.Password
           "relaxing",
           "stressful",
           "exhausting",
-          "challenging",
+          "challenging challenging challenging challenging challenging challenging challenging challenging challenging challenging challenging",
           "wonderful",
           "uneventful",
           "interesting",