On 03/11/2021 12:21, Gábor Csárdi wrote:
Anyone else noticed some weirdness with the arm build when the prompt
has ANSI escape codes?
E.g. in a terminal run this
options(prompt = "\033[1m> \033[0m")
and then at the new prompt type in some longer word and press CTRL+A.
Longer than what?
The cursor does not go back to the beginning of the line, probably
because the width of the prompt is not calculated correctly by the
underlying system library.
readline is not listed at https://mac.r-project.org/libs-arm64/ while
it is listed among the intel libs. Does that mean that R uses libedit
on arm64? Is this an issue with libedit?
This is why we added extSoftversion(): please use it.
For my personal build of R-patched (which uses readline 8.1) this works
as I expected. With the CRAN build of 4.1.2 I do see some weirdness, e.g.
> options(prompt = "\033[1mR> \033[0m")
R> abcdef
where after the Ctrl-A the cursor moves forwards a couple of characters.
(That 'R>' is bold will not show up in an email.
All on Monterey 12.0.1.
AFAIK the reason for not distributing readline with binary distributions
of R is perceived licence restrictions.
--
Brian D. Ripley, rip...@stats.ox.ac.uk
Emeritus Professor of Applied Statistics, University of Oxford
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