[GRASS-dev] Wildcards in multiple map input?

[Blumentrath, Stefan]

Hi Anna,

Thanks for your reply. The closest I found was this:
https://trac.osgeo.org/grass/ticket/1251

Might be dangerous to use an asterisk at command / parser level as the result of the evaluation (meaning the resulting list of maps) is not necessarily known to the user in advance (or may be different from what he or she expects)!?

Anyway, if you consider it a useful feature I will open a ticket …

Cheers
Stefan


From: Anna Petrášová [mailto:kratochanna at gmail.com]
Sent: 10. september 2015 15:44
To: Blumentrath, Stefan <Stefan.Blumentrath at nina.no>
Cc: GRASS developers list (grass-dev at lists.osgeo.org) <grass-dev at lists.osgeo.org>; Andrew McAninch <amcaninch at gmail.com>; Radim Blazek (radim.blazek at gmail.com) <radim.blazek at gmail.com>
Subject: Re: [GRASS-dev] Wildcards in multiple map input?



On Wed, Sep 9, 2015 at 7:06 AM, Blumentrath, Stefan <Stefan.Blumentrath at nina.no<mailto:Stefan.Blumentrath at nina.no>> wrote:
Hi,

For the QGIS-GRASS-plugin update Radim, Pedro, Andrew and me were discussion how to implement multiple selections for map input in the UI in QGIS.

In this context I was thinking that the ability to use wildcards would be really handy for GRASS newcomers. People who are not afraid of the command line can of course easily pipe g.list output to modules with multiple input or re-use the latter from file like e.g. in temporal modules.

My idea would be to allow something like this:
r.series input=temperature_*_05_17 output=norway_national_day_temperature_avg method=average (in order to calculate average temperature for Norways national day for example)
in the GUI and/or command line, where wildcards are evaluated to a list of available maps following that pattern.
The “*” is not allowed in map names, right, so, whenever it appears in a multiple map input it might used to trigger a respective g.list operation…

My question is:
Would it be of interest and feasible to add such a feature to GRASS?
Just an idea to make things easier for beginners and those who only use the GUI...

I thought there was a ticket about this, but I can't find it. The suggestion I remember (but it never got implemented) is to reuse a dialog for selecting multiple maps using regular expressions (accessible from layer manager) and have a small button near the map entry in the autogenerated dialogs which would open this dialog and transfer the resulting map series back in the map entry field. So this would be implemented on the GUI level. Your suggestion would be implemented on parser level. I guess both have some pluses and minuses.

Anna



Cheers
Stefan


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