SI-7898 Read user input during REPL warmup

The compiler is created on main thread and user input is read
on an aux thread (opposite to currently).

Fixes completion when `-i` is supplied.

Now `-i` means pasted and new option `-I` means line-by-line.

The temporary reader uses postInit to swap in the underlying
reader.

Completion is disabled for the temporary reader, rather than
blocking while it waits for a compiler. But manically hitting
tab is one way of knowing exactly when completion is live.

1 files changed, 7 insertions, 1 deletions

diff --git a/src/compiler/scala/tools/nsc/GenericRunnerSettings.scala b/src/compiler/scala/tools/nsc/GenericRunnerSettings.scala
index 1289d55c37..d1f8db048b 100644
--- a/src/compiler/scala/tools/nsc/GenericRunnerSettings.scala
+++ b/src/compiler/scala/tools/nsc/GenericRunnerSettings.scala
@@ -21,9 +21,15 @@ class GenericRunnerSettings(error: String => Unit) extends Settings(error) {
 
   val loadfiles =
     MultiStringSetting(
+      "-I",
+      "file",
+      "load a file line-by-line")
+
+  val pastefiles =
+    MultiStringSetting(
       "-i",
       "file",
-      "load a file (assumes the code is given interactively)")
+      "paste a file")
 
   val execute =
     StringSetting(