[GRASS-dev] r.colors confusion with "color", "rules", and "raster" options

[Markus Neteler]

Hi,

the manual of 6.4 r.colors says:
"The rules color table type will cause r.colors to read color table
specifications from standard
 input (stdin) and will build the color table accordingly.
"

r.colors help | grep rules
...
   color   Type of color table
           options: aspect,aspectcolr,bcyr,bgyr,byg,byr,curvature,
                    differences,elevation,etopo2,evi,grey,grey1.0,grey255,
                    gyr,ndvi,population,rainbow,ramp,ryb,ryg,sepia,slope,
                    srtm,terrain,wave,random,grey.eq,grey.log,rules
...
            rules: create new color table based on user-specified rules
...
   rules   Path to rules file

but:

r.colors map=gpcp_1dd_p1d.2002_sum color=rules rules=color_tab.col
ERROR: "color", "rules", and "raster" options are mutually exclusive

I know, I know.. but it is far from intuitive... any ideas to improve this
behaviour/docs?

This works of course...:
r.colors map=gpcp_1dd_p1d.2002_sum rules=color_tab.col
Color table for <gpcp_1dd_p1d.2001_sum> set to color_tab.col

The first command version above doesn't look harmful to me, could we
(re)enable it?

thanks
Markus