[NTG-context] Iterate over color scheme in ConTeXt/Lua

[Hans Hagen]

On 7/12/2020 9:58 PM, Jairo A. del Rio wrote:
> Hi, list. I've got a question about color schemes in ConTeXt
> 
> What if want to access the entire list of, say, xwi:
> 
> for k,v in pairs(xwi_list) do --Supposing xwi_list is contains xwi colors
>    (whatever action I want)
> end
> 
> So far I'm manually setting colors from colo-imp-xwi.mkiv, but I suspect 
> there's a less manual method. Thank you in advance.
You get a list of defined color names in 'xwi' with:

    attributes.colors.setlist("xwi")

Anyway, "whatever action I want" is somewhat vague, for instance you the 
vebose spec with:

   attributes.colors.values[name]

but there's more. There might be better ways to achieve what you need it 
for.

Here is a nostalgic mkii accessor for such a list (color support is a 
real old feature and conceptually hasn't changed that much):

   \def\WhateverActionIWant#1{#1\par}

   \settrue\collectcolorsinlist \setupcolor[xwi]

   \processcommacommand[\colorlist]\WhateverActionIWant

but you probably don't want to catch up on that.

Hans

-----------------------------------------------------------------
                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
        tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
-----------------------------------------------------------------