Scala REPL会截断输出。

Question

我想知道是否有办法通过设置一个环境变量或其他什么来避免Scala REPL截断输出？

例子

scala> typeOf[Iterator[_]].members.mkString("\n")
res6: String =
override def toString(): String
def toStream: scala.collection.immutable.Stream[A]
def toIterator: Iterator[A]
def toTraversable: Traversable[A]
def sameElements: <?>
def copyToArray[B >: A](xs: Array[B],start: Int,len: Int): Unit
def patch: <?>
def duplicate: <?>
def length: <?>
def sliding$default$2: <?>
def sliding: <?>
def grouped: <?>
class GroupedIterator extends
def buffered: <?>
def indexOf: <?>
def indexOf: <?>
def indexWhere: <?>
def indexWhere: <?>
def find(p: A => Boolean): Option[A]
def contains: <?>
def exists(p: A => Boolean): Boolean
...

我想看看所有的内容。

先谢谢你了。

Answer 1

根据 源头 和 重名

  /** The maximum length of toString to use when printing the result
    *  of an evaluation.  0 means no maximum.  If a printout requires
    *  more than this number of characters, then the printout is
    *  truncated.
    */
  var maxPrintString = config.maxPrintString.option getOrElse 800

哪儿

val maxPrintString = int("scala.repl.maxprintstring")

因此，开始REPL这样的

scala -Dscala.repl.maxprintstring=0

没有截断。

---

解决评论的问题。intp.isettings 在Scala 2.13中，似乎已经由 REPL: 解除UI(shell)与编译器的耦合 [ci: last-only] #5903. 有 待办事项 其中说明。

  // TODO bring back access to shell features from the interpreter?
  // The repl backend has now cut its ties to the shell, except for the ReplReporter interface
  // Before, we gave the user access to: repl, reader, isettings (poor name), completion and history.
  // We could bring back some of this functionality if desired by adding it to ReplReporter

因此在Scala 2.13中使用 -Dscala.repl.maxprintstring 然而，从REPL内部设置应该可以在2.13之前工作。

scala> $intp.isettings.maxPrintString = 0