Smart detection of wrap width?

Yes, I found the width option in the help pages, but I was wondering
if there was automatic setting of the wrapping according to the
current window width.

Your function works exactly as I wished.  I'll probably get smarter
with time (I hope) but would it be reasonably good practice to stick
this into ~/.Rprofile?  I don't suppose there is a way to have it
automatically invoked when the window size/positition changes?  (It's
still priceless even without automatic triggering).

On Fri, Apr 17, 2015 at 7:20 PM, MacQueen, Don <macqueen1 at llnl.gov>
wrote:

A lot of this depends on what context you are running R in, e.g.,
Windows console, Mac console, or command line in a unix-alike. Or
within ESS in emacs. Those are different interfaces supported by, to
some extent, different people, and are based on the underlying
capabilities provided by the operating system.

Have you yet encountered
  options()$width
?
For example,
  options(width=100)
will cause wrapping at 100, at least for certain kinds of output.

In an xterm shell running in an X windows context, I frequently use

setwid <- function ()
{
    if (!interactive())
        return(invisible(NULL))
    scon <- pipe("stty -a")
    stty <- scan(scon, what = "", sep = ";", quiet = T)
    close(scon)
    cstr <- stty[grep("columns", stty)]
    options(width = as.numeric(gsub("[^0-9]", "", cstr, ignore.case = T)))
    paste("width =", options()$width, "\n")
}

A function I wrote that resets the width option to match the window
widths, and therefore adjusts the wrapping after I resize a windwo.