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User imports that reference Predef are relocated to the top of
the wrapping template so that they can hide implicits defined
in Predef.
Only one import from Predef is retained for special treatment.
This is simple and sane. The test shows that `import Predef._`
restores Predef implicits even if a user-defined term would
normally be in scope.
A smart `:import` command to turn off or quarantine imports explicitly
would allow fine-grained control.
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Everyone knows that a `help` command will result in `more information`.
This commit moves the version string to the second line and adds some
verve to the welcome.
If anyone can't live without the old banner, they are now able to
configure it explicitly, so there is still no blood on our hands.
```
$ scala
Welcome to Scala version 2.11.6 (Java HotSpot(TM) 64-Bit Server VM, Java 1.8.0_40).
Type in expressions to have them evaluated.
Type :help for more information.
scala> :quit
$ skala
Welcome to Scala!
version 2.11.7-20150623-155244-eab44dd092 (Java HotSpot(TM) 64-Bit Server VM, Java 1.8.0_40).
Type in expressions for evaluation. Or try :help.
scala> :quit
```
REPL tests now lop off the actual length of the welcome header; or, if
necessary, remove the version number from a header embedded in output.
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To make code in error messages line up with the original line of
code, templated code is indented by the width of the prompt.
Use the raw prompt (without ANSI escapes or newlines) to determine
the indentation.
Also, indent only once per line.
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The reset and replay commands take arbitrary command line args.
When settings args are supplied, the compiler is recreated.
For uniformity, the settings command performs only the usual
arg parsing: use -flag:true instead of +flag, and clearing a
setting is promoted to the command line, so that -Xlint: is not
an error but clears the flags.
```
scala> maqicode.Test main null
<console>:8: error: not found: value maqicode
maqicode.Test main null
^
scala> :reset -classpath/a target/scala-2.11/sample_2.11-1.0.jar
Resetting interpreter state.
Forgetting all expression results and named terms: $intp
scala> maqicode.Test main null
Hello, world.
scala> val i = 42
i: Int = 42
scala> s"$i is the loneliest numbah."
res1: String = 42 is the loneliest numbah.
scala> :replay -classpath ""
Replaying: maqicode.Test main null
Hello, world.
Replaying: val i = 42
i: Int = 42
Replaying: s"$i is the loneliest numbah."
res1: String = 42 is the loneliest numbah.
scala> :replay -classpath/a ""
Replaying: maqicode.Test main null
<console>:8: error: not found: value maqicode
maqicode.Test main null
^
Replaying: val i = 42
i: Int = 42
Replaying: s"$i is the loneliest numbah."
res1: String = 42 is the loneliest numbah.
```
Clearing a clearable setting:
```
scala> :reset -Xlint:missing-interpolator
Resetting interpreter state.
scala> { val i = 42 ; "$i is the loneliest numbah." }
<console>:8: warning: possible missing interpolator: detected interpolated identifier `$i`
{ val i = 42 ; "$i is the loneliest numbah." }
^
res0: String = $i is the loneliest numbah.
scala> :reset -Xlint:
Resetting interpreter state.
Forgetting this session history:
{ val i = 42 ; "$i is the loneliest numbah." }
scala> { val i = 42 ; "$i is the loneliest numbah." }
res0: String = $i is the loneliest numbah.
```
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Closing the REPL with Ctrl+D does not issue a newline, so the user's
prompt displays on the same line as the `scala>` prompt. This is bad.
We now force a newline before closing the interpreter, and display
`:quit` while we're at it so that people know how to exit the REPL
(since `exit` doesn't exist anymore).
The tricky part was to only add a newline when the console is
interrupted, and *not* when it is closed by a command (like `:quit`),
since commands are processed after their text (including newline) has
been sent to the console.
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A settings command for the rest of us.
The usual command line options are used, except that boolean flags
are enabled with +flag and disabled with -flag.
```
scala> :settings +deprecation
scala> new BigInt(java.math.BigInteger.TEN) { }
<console>:8: warning: inheritance from class BigInt in package math is deprecated: This class will me made final.
new BigInt(java.math.BigInteger.TEN) { }
^
res0: BigInt = 10
scala> :settings -deprecation
scala> new BigInt(java.math.BigInteger.TEN) { }
res1: BigInt = 10
```
Multivalue "colon" options can be reset by supplying no values
after the colon. This behavior is different from the command line.
```
scala> 1 toString
warning: there were 1 feature warning(s); re-run with -feature for details
res0: String = 1
scala> :settings -language:postfixOps
scala> 1 toString
res1: String = 1
scala> :settings
-d = .
-encoding = UTF-8
-explaintypes = false
-language = List(postfixOps)
-nowarn = false
scala> :settings -language:
scala> :settings
-d = .
-encoding = UTF-8
-explaintypes = false
-language = List()
-nowarn = false
```
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