SI-4684 Repl supports whole-file paste (rebased)

[som-snytt]

Re-rebased #2719: Rebased #2696

The first test repl-paste4 was failing for an unknown reason, with no diff in the build output.

This version makes that test a SessionTest with no check file. The research question is whether that changes how line endings are handled.

The second test was already a SessionTest but used a private version, but now it can use the class in partest.

[adriaanm]

LGTM

[reflectionalist]

Why not just fix :load rather than introduce a command-line-like option -raw to :paste?

[retronym]

:load has a different meaning. For example, :load can accept REPL commands, such as :help or :power.

[som-snytt]

@plmday :load, :paste, :paste -raw are different features.

[som-snytt]

Jinx.

[reflectionalist]

@retronym I don't understand what you mean by :load can accept REPL commands.

scala> :help load

:load <path> (no extended help available.)

scala> :load help
That file does not exist

scala> :load :help
That file does not exist

[reflectionalist]

@som-snytt What other features does :load have than loading a file?

[som-snytt]

I would ask on the ML for an extended discussion, but to illustrate, my scala -i init.script:

apm@mara:~$ cat init.script
:paste /home/apm/funcs.script
:paste /home/apm/imports.script
apm@mara:~$ scalam
Welcome to Scala version 2.11.0-M5 (OpenJDK 64-Bit Server VM, Java 1.7.0_25).
Type in expressions to have them evaluated.
Type :help for more information.

scala> :load init.script
Loading init.script...
Pasting file /home/apm/funcs.script...
defined object Timing
Pasting file /home/apm/imports.script...
import language._
import language.experimental._
import annotation._
import util._
import reflect.io._
import reflect.macros._
import reflect.runtime._
import universe._
import concurrent._
import duration._
import collection.generic.{CanBuildFrom=>CBF}
import collection.mutable
import mutable.{Map=>MMap}
import java.util.regex._
import sys.exit
import System.{currentTimeMillis=>time, nanoTime=>now}
import Timing.timed

scala>