[QGIS-Developer] Skip loading plugin if errors

[matteo]

Another solution, not the best one and working just because the plugin 
is a Processing provider would be to put

try:
     import external_library
except ImportError:
     raise QgsProcessingException(self.tr('This algorithm requires the 
Python ...... library. Please install this library and try again.'))

within the processAlgorithm method. I know that if there are many 
algorithms you have to repeat the code for each one, and that if the 
algorithm has many parameters, the user fills all of them and it's not 
nice to inform after, but.... :)

Cheers

Matteo



On 12/28/22 10:40, Germán Carrillo wrote:
> Hi Matteo,
> 
> I've added a few validations for this plugin to gently inform users of 
> missing dependencies:
> 
> https://github.com/SwissTierrasColombia/Asistente-LADM-COL/blob/master/asistente_ladm_col/__init__.py <https://github.com/SwissTierrasColombia/Asistente-LADM-COL/blob/master/asistente_ladm_col/__init__.py>
> 
> Hope that helps.
> 
> Regards,
> 
> Germán
> 
> 
> El mié, 28 dic 2022 a las 9:58, matteo via QGIS-Developer 
> (<qgis-developer at lists.osgeo.org 
> <mailto:qgis-developer at lists.osgeo.org>>) escribió:
> 
>     Hi devs,
> 
>     I'm developing a Processing provider plugin that needs some external
>     python packages. If these are not installed on the system, when
>     starting
>     QGIS and loading the plugin the error message pops up (of course).
> 
>     Is there a way to have a "more friendly" message without opening the
>     Stacktrace? For example creating a messagebox/bar with the message
>     "Install the package...... else you cannot use the plugin"
> 
>     I've added a simple try/except in the plugin classFactory method but
>     I'm
>     still stuck in the loop somewhere.
> 
>     Thanks for any suggestion
> 
>     Cheers
> 
>     Matteo
> 
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