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

[G. Allegri]

Rephrasing what I wrote before, what about dropping ScriptAlgorithm and
make ScriptAlgorithmProvider simply provide its algorithms from the special
scripts folder?

giovanni



2018-01-29 10:51 GMT+01:00 G. Allegri <giohappy at gmail.com>:

> 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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>>>> >
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>>>>
>>>>
>>>> --
>>>> Alexander Bruy
>>>>
>>>
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>>
>>
>
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