[R] repeat { readline() }

[Prof Brian Ripley]

Ctrl-Break works: see the rw-FAQ and README.rterm.  (You'll need a return 
to see a new prompt.)

It is related to your reading directly from the console, so Ctrl-C is 
getting sent to the wrong place, I believe.  (There's a comment from Guido 
somewhere in the sources about this, and this seems corroborated by the 
fact that Ctrl-C will interrupt under Rterm --ess.)

On Sun, 8 Jan 2006, Henrik Bengtsson wrote:

> Hi.
>
> Using Rterm v2.2.1 on WinXP, is there a way to interrupt a call like
>
>  repeat { readline() }
>
> without killing the Command window?  Ctrl+C is not interrupting the loop:
>
> R : Copyright 2006, The R Foundation for Statistical Computing
> Version 2.2.1 Patched (2006-01-01 r36947)
> <snip></snip>
>
> > repeat { readline() }
> ^C
> ^C
> ^C
> ^C
>
> On Unix it works.  The problem seems to get the interrupt signal to
> "occur" outside the readline() call so that "repeat" is interrupted. Doing
>
> repeat { readline(); Sys.sleep(3) }
>
> and it is likely that can generate an interrupt signal outside readline().
>
> It seem like readline()/readLines(n=1) or an underlying method catches
> the interrupt signal quietly and just waits for a symbol to come
> through.  Try readline() by itself and press Ctrl+C.  Maybe this is a
> property of the Windows Command terminal, I don't know, but is it a
> wanted feature and are R core aware of it?  Note that, in Rgui it is
> possible to interrupting such a loop by pressing ESC.
>
> Cheers
>
> Henrik
>
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-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595