SmartConsole stuff

[Lendvai Attila]

Hi!

Recently I've added the possibility to compile plugins for the vm, and
implemented a smart console plugin that uses ncurses. You can compile it
with 'make plugins'.

The slate-side file is 'src/lib/smartconsole.slate'. After loading it,
the code below should run fine: (I've only tested it on cygwin)

[| c |
  c: SmartConsole new.
  c open.

  [| e |
    e: c nextEvent.
    e keyName caseOf: {
        #LeftArrow -> [
          c moveCursorLeft.
        ].
        #RightArrow -> [
	  c moveCursorRight.
        ].
        #UpArrow -> [
          c moveCursorUp.
        ].
        #DownArrow -> [
          c moveCursorDown.
        ].
    } otherwise: [
      e char ifNotNil: [
        e keyCode >= 16r30 /\ [e keyCode <= 16r37] ifTrue: [
          c setForeground: e keyCode - 16r30.
        ] ifFalse: [
          e char = $\s ifTrue: [
            c scroll.
          ] ifFalse: [
            c write: e char.
          ].
        ].
      ].
    ].

    c writeCursorPositionAt: 30 , 0 .

    e char ifNil: [
      False
    ] ifNotNil: [
      e char = $q
    ]
  ] whileFalse.
  c close.
] do.

You can move with the arrow keys, change colors with the numbers and
type characters, q quits.

For the vm to find the dll's/so's they must be in the dll search path.
This differs on platforms, unices use LD_LIBRARY_PATH, on windows PATH
is searched, but the directory where the exe is, is also searched (could
be it works on unices, too).

Todo:
- Transparently connect it to the repl/debugger
- Implement image startup/shutdown hooks/machinery (Lee? ideas,
guidance? :)
- The SmartConsolePlugin became ncurses dependent due to the 'strange'
color handling of ncurses, so it should be chopped into two: the base
functionality and the ncurses subtype. (Can wait until someone plans to
work on another plugin implementation)

Issues:
- Where to put the dll's: make install target
- Image save/startup hooks are needed to persist dll reference and
reopen on startup. This causes a crash if image is saved after the
plugin was loaded, then the saved image started and the SmartConsole
stuff is run. (Due to the invalid persisted dll pointer)
- Brian reported that it doesn't work on OS X, errors due to some
ncurses color stuff

It would be helpful is someone could take a look at it on linux/other
unices, but I'll try to test it myself as time permits.

Have fun,

- 101