Rename --close-io-streams to --detach-stdio

main-command/src/main/scala/sbt/BasicCommandStrings.scala

@@ -212,7 +212,7 @@ $AliasCommand name=
     "Provides an interactive prompt from which commands can be run on a server."
   def DashClient: String = "-client"
   def DashDashClient: String = "--client"
-  def CloseIOStreams: String = "--close-io-streams"
+  def DashDashDetachStdio: String = "--detach-stdio"
 
   def StashOnFailure: String = "sbtStashOnFailure"
   def PopOnFailure: String = "sbtPopOnFailure"

main-command/src/main/scala/sbt/BasicKeys.scala

@@ -129,8 +129,8 @@ object BasicKeys {
     "List of template resolver infos.",
     1000
   )
-  private[sbt] val closeIOStreams = AttributeKey[Boolean](
-    "close-io-streams",
+  private[sbt] val detachStdio = AttributeKey[Boolean](
+    "detach-stdio",
     "Toggles wheter or not to close system in, out and error when the server starts.",
     1000
   )

main-command/src/main/scala/sbt/internal/client/NetworkClient.scala

@@ -299,7 +299,7 @@ class NetworkClient(
           ).mkString(",")
 
         val cmd = List(arguments.sbtScript) ++ arguments.sbtArguments ++
-          List(BasicCommandStrings.CloseIOStreams, BasicCommandStrings.DashDashServer)
+          List(BasicCommandStrings.DashDashDetachStdio, BasicCommandStrings.DashDashServer)
         val processBuilder =
           new ProcessBuilder(cmd: _*)
             .directory(arguments.baseDirectory)

main/src/main/scala/sbt/Main.scala

@@ -86,14 +86,14 @@ private[sbt] object xMain {
             NetworkClient.run(dealiasBaseDirectory(configuration), args)
             Exit(0)
           } else {
-            val closeStreams = userCommands.exists(_ == BasicCommandStrings.CloseIOStreams)
+            val detachStdio = userCommands.exists(_ == BasicCommandStrings.DashDashDetachStdio)
             val state0 = StandardMain
               .initialState(
                 dealiasBaseDirectory(configuration),
                 Seq(defaults, early),
                 runEarly(DefaultsCommand) :: runEarly(InitCommand) :: BootCommand :: Nil
               )
-              .put(BasicKeys.closeIOStreams, closeStreams)
+              .put(BasicKeys.detachStdio, detachStdio)
             val state = bootServerSocket match {
               case Some(l) => state0.put(Keys.bootServerSocket, l)
               case _       => state0
@@ -230,7 +230,9 @@ object StandardMain {
 
     import BasicCommandStrings.isEarlyCommand
     val userCommands =
-      configuration.arguments.map(_.trim).filterNot(_ == BasicCommandStrings.CloseIOStreams)
+      configuration.arguments
+        .map(_.trim)
+        .filterNot(_ == BasicCommandStrings.DashDashDetachStdio)
     val (earlyCommands, normalCommands) = (preCommands ++ userCommands).partition(isEarlyCommand)
     val commands = (earlyCommands ++ normalCommands).toList map { x =>
       Exec(x, None)

main/src/main/scala/sbt/internal/CommandExchange.scala

@@ -246,7 +246,11 @@ private[sbt] final class CommandExchange {
           firstInstance.set(false)
       }
       Terminal.setBootStreams(null, null)
-      if (s.get(BasicKeys.closeIOStreams).getOrElse(false)) Terminal.close()
+
+      if (s.get(BasicKeys.detachStdio).getOrElse(false)) {
+        Terminal.close()
+      }
+
       s.get(Keys.bootServerSocket).foreach(_.close())
     }
     s.remove(Keys.bootServerSocket)