Update.

The crayon package in R uses ANSI color codes sent to the terminal. The
regular color codes are 30-37. For example, 31 is red, which you can see
like this:
R> red("this is red")
[1] "\033[31mthis is red\033[39m"

The pillar package is using silver (really gray, but called silver to avoid
a name clash) to print place-holding zeros that are not really of
interest.  But silver/gray is not part of the 8 ANSI base colors stored
in ansi-color-names-vector.  Instead, silver() uses code 90, which is a
part of the high-intensity colors.
R> silver("silver")
[1] "\033[90msilver\033[39m"

But the high-intensity colors are not supported by ansi-color.el, at least
by default.  Someone has created a fix for this by extending the colors.
See
https://oleksandrmanzyuk.wordpress.com/2011/11/24/better-emacs-shell-part-ii/

I have not tried this to see if it works.

Kevin Wright



On Wed, Sep 13, 2017 at 7:06 PM, Kevin Wright <kw.s...@gmail.com> wrote:

> I found a simple fix:
>
> options(crayon.enabled=TRUE)
>
> After which, the following example works:
> example(green)
>
> Now to see if I can get the colored output from the pillar package...
> https://github.com/hadley/pillar
>
> Sort of works. Negative numbers are red, but place-holder zeros are not
> being shown in gray.
>
> Kevin Wright
>
>
> On Wed, Sep 13, 2017 at 6:50 PM, Kevin Wright <kw.s...@gmail.com> wrote:
>
>>
>> Has anyone successfully used the R package "crayon" for colored text
>> inside Emacs?  The package claims to work with ESS:
>> https://cran.r-project.org/web/packages/crayon/index.html
>>
>> Digging deeper, I find this inside my iESS buffer:
>>
>> crayon::has_color() # returns FALSE
>>
>> Which seems to be caused by this code in the has_color function:
>>
>> isatty(stdout()) # returns FALSE. Why not TRUE?
>>
>> Maybe my inferior terminal settings aren't quite right... Or maybe the
>> problem is with Windows...
>>
>> --
>> Kevin Wright
>>
>
>
>
> --
> Kevin Wright
>



-- 
Kevin Wright

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