[Rd] Hook for running a function before evaluation

From: Philippe Grosjean <phgrosjean_at_sciviews.org>
Date: Fri, 06 Jul 2007 15:15:20 +0200


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

-- 

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) ) ) ) ) ( ( ( ( ( Prof. Philippe Grosjean ) ) ) ) ) ( ( ( ( ( Numerical Ecology of Aquatic Systems ) ) ) ) ) Mons-Hainaut University, Belgium ( ( ( ( ( .............................................................. ______________________________________________ R-devel_at_r-project.org mailing list
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