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Having QGIS and GRASS GIS 7 installed, how can I expose a GRASS GIS add-on, which has been installed using g.extension, in QGIS' Processing framework?

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QGIS core developer Nyal Dawson explained a best-practice approach in this e-mail thread.

Overview

  1. Subclass QGIS' class Grass7AlgorithmProvider

  2. Set the value of descriptionFolder to the path of the add-on in question

  3. Override the methods for logo, descriptions, name etc.

An example of it, implemented by Panagiotis Mavrogiorgos is https://gitlab.com/natcapes/natcapes_qgis, which literally exposes the https://gitlab.com/natcapes/r.estimap.recreation GRASS GIS add-on under Processing.

Finally, it would be nice to have an update for https://issues.qgis.org/issues/21322 -- essentially, an update of the "documentation" file https://github.com/qgis/QGIS/blob/master/python/plugins/processing/algs/grass7/grass7.txt.

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