[GRASS-dev] Re: doubt with single/double dashed flags from interface description

[andrea antonello]

Hi Markus,
thanks for the reply and description. Everything is clear now. I will
simply ignore them and add them by default.

Thanks,
Andrea



On Wed, May 25, 2011 at 8:50 AM, Markus Metz
<markus.metz.giswork at googlemail.com> wrote:
> Hi Andrea,
>
> the double-dash options are generic options available for every module
> and not defined by the module: --overwrite, --verbose, --quiet. These
> options are used to set global environment variables. Using
> r.watershed as example, it could be called through python with e.g.
>
> grass.run_command("r.watershed", elevation = input, accumulation =
> output, flags = 'a', overwrite = True, verbose = True)
>
> Some modules, e.g. some of the import modules, have their own
> (single-dash) -o flag, where
>
> v.in.ogr -o --o
>
> means "override projection check and overwrite output if existing"
>
> IOW, you could ignore these three double-dash options when handling
> flags of interface descriptions because they are available for every
> module and not module-specific, if that makes your life easier in
> generating wrappers.
>
> HTH,
>
> Markus M
>
>
> On Tue, May 24, 2011 at 9:23 PM, andrea antonello
> <andrea.antonello at gmail.com> wrote:
>> My only guess here is that single character flags have a single dash
>> and multiple character flags a double dash?
>>
>> Andrea
>>
>> On Tue, May 24, 2011 at 9:12 PM, andrea antonello
>> <andrea.antonello at gmail.com> wrote:
>>> Hi all,
>>> I have a problem with the handling of flags in the interface description.
>>>
>>> Let's take for example pieces of r.watershed,
>>> The help tells me:
>>> [...]
>>>  -a   Use positive flow accumulation even for likely underestimates
>>>        See manual for a detailed description of flow accumulation output
>>>  --o   Allow output files to overwrite existing files
>>> [...]
>>>
>>> and the interface description:
>>> [...]
>>>
>>>        <flag name="a">
>>>                <label>
>>>                        Use positive flow accumulation even for likely underestimates
>>>                </label>
>>>                <description>
>>>                        See manual for a detailed description of flow accumulation output
>>>                </description>
>>>        </flag>
>>>        <flag name="overwrite">
>>>                <description>
>>>                        Allow output files to overwrite existing files
>>>                </description>
>>>        </flag>
>>> [...]
>>>
>>> I can't find a way to understand why the first has one single dash,
>>> while the overwrite flag needs two.
>>> Any hints?
>>>
>>> Thanks,
>>> Andrea
>>>
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>