[QGIS-Developer] Example script for Processing in QGIS 3

[G. Allegri]

Hi Anita,
that's exactly what I also was thinking about. What about dropping scripts
in favour of "on the fly"  QgsProcessingAlgorithms?
A single, unified, way of defining them, without the special parameters
syntax of scripts...

Giovanni

2018-01-29 9:55 GMT+01:00 Anita Graser <anitagraser at gmx.at>:

> I've decided to go the algorithm provider plugin route for my scripts:
> https://anitagraser.com/2018/01/28/porting-processing-scripts-to-qgis3/
>
> But I'm also thinking of my students whom I want to show how to write
> tools for QGIS. For many of them, it's their first contact with Python, so
> starting a provider plugin is well out of their comfort zone. On the other
> hand, the scripts are not very pythonic. Many beginners already had issues
> with the QGIS2 version of scripts. I think, they would have an easier time
> if they would only have to implement a QgsProcessingAlgorithm with the rest
> of the provider plugin complexity hidden from their sight. If that's
> possible.
>
> Regards,
> Anita
>
>
>
>
> On Sat, Jan 27, 2018 at 4:48 PM, G. Allegri <giohappy at gmail.com> wrote:
>
>> I know Alexander. The point was processing scripts and their future...
>>
>> giovanni
>>
>> Il 27 gen 2018 4:29 PM, "Alexander Bruy" <alexander.bruy at gmail.com> ha
>> scritto:
>>
>>> It is possible to write algorithms using same approach as in core. Just
>>> create
>>> "provider plugin" and that's it. This functionality was here almost
>>> from the very
>>> beginning of the Processing.
>>>
>>> 2018-01-27 17:08 GMT+02:00 G. Allegri <giohappy at gmail.com>:
>>> > Honestly I think script syntax wasn't that bad. At least it was quite
>>> easy
>>> > for a set of power users, as I could verift during my past courses.
>>> > Anyway I agree with the rationale: having a unified, pythonic way, to
>>> write
>>> > both algorithms and scripts... well, might be the case to ultimately
>>> drop
>>> > scripts?
>>> >
>>> > Whatever the choice, we should make users aware of the current unclear
>>> > situation, that things are being discussed and still evolving. This
>>> will
>>> > prevent confusion and maybe encourage participation.
>>> >
>>> > How could this discussion be brought forward? My first question would
>>> be: do
>>> > we still need scripts?
>>> >
>>> > In any case thanks to Nyall and the others for the great work! ;)
>>> >
>>> > Giovanni
>>> >
>>> >
>>> > Il 27 gen 2018 12:15 PM, "Paolo Cavallini" <cavallini at faunalia.it> ha
>>> > scritto:
>>> >>
>>> >> Il 27/01/2018 00:39, Nyall Dawson ha scritto:
>>> >>
>>> >> > It's not too late to improve this for 3.x. Why don't we get the
>>> daily
>>> >> > Python users and experts involved here and come up with a more
>>> >> > Python-like approach to processing scripts?
>>> >>
>>> >> IMHO this is worth a wider announcement and call for help, if possible
>>> >> with some kickoff instructions.
>>> >> All the best.
>>> >>
>>> >> --
>>> >> Paolo Cavallini - www.faunalia.eu
>>> >> QGIS & PostGIS courses: http://www.faunalia.eu/training.html
>>> >> https://www.google.com/trends/explore?date=all&geo=IT&q=qgis,arcgis
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>>>
>>>
>>> --
>>> Alexander Bruy
>>>
>>
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