From: Bob Arning [arning@charm.net]
Sent: Mittwoch, 21. Juni 2000 22:01
To: karl.ramberg@chello.se; squeak@cs.uiuc.edu
Subject: Re: Emergency Evaluator - need help

On Wed, 21 Jun 2000 19:43:02 +0200 Karl Ramberg <karl.ramberg@chello.se> wrote:
>I like that there is a emergency evaluator that pops up.
>But I don't know how to use it. Could one list the 
>most common uses at the top of it or have a 
>help function ? Where is it in the system ?

Karl,

Check out Transcripter>>readEvalPrint. It wouldn't be a bad idea to have a few suggestions printed there for reference. Some handy possibilities I have used are

Project current exit  "gets me out of a potentiall corrupt project/world"
ScreenController new fullScreenOff "gives access to the Mac menu bar again"

Cheers,
Bob


From: Bolot Kerimbaev [bolot@cc.gatech.edu]
Sent: Mittwoch, 21. Juni 2000 22:25
To: squeak@cs.uiuc.edu
Subject: Re: Emergency Evaluator - need help

Today, I had a need for yet another one:

Utilities revertLastMethodSubmission
    "reverts the last method changed to the previous version"

(I changed some SystemWindow handling code, so debugger couldn't be
opened)

It would be nice (and probably easy) to add completion (I had to open
another Squ
eak to get the aforementioned method name).

Bolot


From: Stefan Matthias Aust [sma@3plus4.de]
Sent: Mittwoch, 21. Juni 2000 23:18
To: squeak@cs.uiuc.edu
Subject: Re: Emergency Evaluator - need help

If the system has trouble to open a debugger, that is there's an exception 
while opening the debugger because of another exception, the system 
switches to panic mode and uses #primitiveError: to display a black and 
white stacktrace together with the often not very helpful message to press 
any key to restart.

Now press not any key but CR (Enter).  A small black and white window opens 
that shows a command line on which you can enter any Smalltalk 
expression.  This is the so called Transcripter.  Try

  Transcripter emergencyEvaluator

to open it right now.  As that window says, you should type

  exit [CR]

to leave that tool again.  Otherwise you can enter any valid Smalltalk 
expression which will be evaluated and printed (like a print-it) upon 
pressing [CR].  Be careful not to make typing mistakes as there's no error 
handling for syntax errors.  You can use [BS] (Backspace) to edit the input.

Really use, if you for example crashed the system by modifying an important 
UI class, is this expression

  Utilities revertLastMethodSubmission

If you're like me who of course edits MVC classes while working in MVC or 
who hacks Morphic while being in an Morphic project, it might be useful to 
define

  Utilities revert
   self revertLastMethodSubmission

and

  Smalltalk at: #U put: Utilities

bye
Stefan Matthias Aust // Pilgrims, beware of the Dark between the Fading Stars