[GRASS-user] relative path to GISbase in Scripts

[Johannes Radinger]

Am 14.05.2011 um 08:32 schrieb Markus Neteler:

> On Sat, May 14, 2011 at 2:50 AM, Glynn Clements
> <glynn at gclements.plus.com> wrote:
>> 
>> Johannes Radinger wrote:
>> 
>>> at the moment I am connecting to the sqlite database with the use of a absolute path in a pythonscript like:
> ...
>> 
>>        import grass.script as grass
>>        import os.path
>> 
>>        env = grass.gisenv()
>> 
>>        gisdbase = env['GISDBASE']
>>        location = env['LOCATION_NAME']
>>        mapset = env['MAPSET']
>> 
>>        path = os.path.join(gisdbase, location, mapset, 'sqlite.db')
> 
> Added to
> http://grass.osgeo.org/wiki/GRASS_and_Python#Path_to_GISDBASE

Thank you for adding it to the wiki, I think that can be useful for a lot other people.
Just two related questions:

1) I think it is not possible but I just want to ask: Can that method be anyhow used also for the
g.parser options? I tried:

#%Option
#% key: PS_map
#% type: string
#% required: no
#% multiple: no
#% key_desc: name
#% description: Name for PostScript output file
#% gisprompt: new_file,file,output
#% guisection: Optional
#% answer: os.path.join(gisdbase, location, mapset, 'PS_map_result')
#%end

But for sure this is just a string and therefore doesn't work. But is it somehow possible to use
relative information about the path to a file in the answer-option for g.parser?


2) How can I get the path to the script-file i am running at the moment in GRASS? like ./././GRASS/6.5/Modules/bin/script.py? This should work on every operating system.

/johannes


> 
> Markus
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