[Rd] Hook for running a function before evaluation

[Philippe Grosjean]

Hi Byron,

Excellent! I am also on OS X (together with Win XP and Quantian using 
Parallels desktop ;-)

So far, so good, I have the latest RExecServer running in a terminal. 
So, what can I do with it?
Best,

Philippe

..............................................<°}))><........
  ) ) ) ) )
( ( ( ( (    Prof. Philippe Grosjean
  ) ) ) ) )
( ( ( ( (    Numerical Ecology of Aquatic Systems
  ) ) ) ) )   Mons-Hainaut University, Belgium
( ( ( ( (
..............................................................

Byron Ellis wrote:
> Hi Philippe,
> 
> This is exactly the approach being taken in RExecServer (which is in
> turn possibly connected to front ends via distributed objects). It's
> an OS X app so the model is
> 
> my_ReadConsole(...) {
> didFinishEvaluationForInterpreter(...);
> internalReadConsole(...); (usually start the run loop and wait for an
> appropriate event)
> willBeginEvaluationForInterpreter(...);
> }
> 
> technically there should also be shouldBeginEvaluationforInterpreter()
> to let us bail out of evaluation and head back to the reader loop.
> 
> http://repo.or.cz/w/RExecServer.git
> 
> On 7/6/07, Philippe Grosjean <phgrosjean at sciviews.org> wrote:
>> Hello,
>> I like much addTaskCallback() and friends. However, there are situations
>> were we would like to have a function run BEFORE, not after every
>> top-level tasks. I think specifically to reset options(width = ) to
>> accommodate to the current width of the console, using something like:
>>
>> options(width = system("tput cols"))
>>
>> I am sure there are many other situations where this could be useful.
>> Combining tasks run before and after evaluation, one could design a
>> system to (remotely) indicate when a given R kernel is
>> starting/evaluating/ending evaluation of some code (with Rpad in mind,
>> for instance).
>>
>> How difficult would it be to implement such Tasks run before top-level 
>> ones?
>>
>> Best,
>>
>> Philippe
>> -- 
>> ..............................................<°}))><........
>>   ) ) ) ) )
>> ( ( ( ( (    Prof. Philippe Grosjean
>>   ) ) ) ) )
>> ( ( ( ( (    Numerical Ecology of Aquatic Systems
>>   ) ) ) ) )   Mons-Hainaut University, Belgium
>> ( ( ( ( (
>> ..............................................................
>>
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> 
>