[GRASS-dev] r.colors -help

[Vaclav Petras]

On Tue, Mar 11, 2014 at 9:40 AM, Alessandro Samuel Rosa <
alessandrosamuel at yahoo.com.br> wrote:

>  Dear Grass Developers,
>
> I am using GRASS from R with package spgrass6. There is an inconsistency
> between some modules which I believe is not related with R or spgrass6.
> Usually, calling a module without passing any arguments is the same as
> using argument "-help". For example, system("r.carve") returns the same as
> system("r.carve -help"). This is not true for "r.colors". When calling
> "r.colors" without the help argument, GRASS returns an error message
> informing that no raster map was specified.
>

I can confirm the inconsistency. I tested command line and ipython. In
GRASS 7, r.colors returns 1 and prints error message. r.carve opens GUI,
and g.region returns 0 and does nothing.

{{{
GRASS > r.colors
ERROR: Options <map> or <file> must be specified
GRASS > r.carve
(GUI opens)
GRASS > g.region
(nothing happens)
}}}

{{{
In [1]: import grass.script.core as gcore

In [2]: gcore.run_command('r.colors')
ERROR: Options <map> or <file> must be specified
Out[2]: 1

In [3]: gcore.run_command('r.carve')
(GUI opens)

In [4]: gcore.run_command('g.region')
Out[4]: 0
}}}

If I not wrong, there is another module that I used sometime ago which has
> the same behaviour, but I can not remember which.
>

These can apply to modules which has mandatory argument but there are two
to choose from such as `file` and `map` in case of r.colors.

>
> I suggest that, if possible, the help of any module could be called simply
> passing the module name without further arguments.
>
> Regards,
>
>
>   --
>
> Alessandro Samuel-Rosa
> ---
> PhD Candidate Graduate School in Agronomy - Soil Science
> Federal Rural University of Rio de Janeiro
> Seropédica, Rio de Janeiro, Brazil
> ---
> Guest Researcher ISRIC - World Soil Information
> Wageningen, the Netherlands alessandro.rosa at wur.nl | Phone 0031 06 4435
> 9563
> ---
> Homepage: soil-scientist.net Skype: alessandrosamuel
>
>
>
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