On 2010-05-30 15:33, Prof. John C Nash wrote:
A few days ago on R-help I asked about a cross-platform timeout version of
readline().
Some suggestions, but only partial joy so far. I can get the Gnu bash 'read -t
...' to
work in Windows by using the 'bash -c ' construct, but then R's system()
function does not
seem to allow this to pass through. Similarly a Perl and Free Pascal routine
that I tried,
the latter being a single executable that did the prompt and the timeout. (I
can send code
offline if anyone interested -- not fully protected against bad inputs,
however.)
Now I'm wondering where the code for readline is located in the R source. I've
tracked as
far as the 'do_readln' in names.c, but now want to find the actual code to see
if I can
patch it, though I am a real novice in C. Suggestions welcome.
My application, FYI, is to have a script that will display something, and wait
for a
keypress (for readline it seems to need the Enter key) but timeout after a
preset number
of seconds. The setTimeLimit "almost" works -- but not for readline. I'm
thinking of a
modified readline like readline(prompt='Do you want to continue?', timeout=6).
Note that the issue seems to be Windows. I haven't a Mac to try, but Linux can
be made to
function by various methods at the top. Sigh.
JN
I can't help with your project, but check scan.c for do_readln.
-Peter Ehlers
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