Scala REPL 截断输出

Question

我想知道是否有任何方法可以通过设置环境变量或其他方式来避免 Scala REPL 截断输出？

示例

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: <?>
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
...

我想看全部内容

提前致谢。

Answer 1

根据source and retronym

  /** 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

哪里

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

因此像这样启动 REPL

scala -Dscala.repl.maxprintstring=0

没有截断。

针对评论，intp.isettings 似乎已在 Scala 2.13 中被 REPL: decouple the UI (shell) from the compiler [ci: last-only] #5903. There exists TODO 删除，其中指出：

  // 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 方法，但是从 REPL 内部设置应该在 2.13 之前工作

scala> $intp.isettings.maxPrintString = 0

Answer 2

解决方法是直接打印字符串：

println(res6)

Scala REPL 截断输出

Scala REPL truncates the output

scala

truncate

environment-variables

scala-repl