support grass algorithms in profile folder

python/plugins/grassprovider/Grass7Algorithm.py

@@ -25,6 +25,7 @@ import re
 import uuid
 import math
 import importlib
+from pathlib import Path
 
 from qgis.PyQt.QtCore import QCoreApplication, QUrl
 
@@ -139,11 +140,16 @@ class Grass7Algorithm(QgsProcessingAlgorithm):
 
         # Use the ext mechanism
         name = self.name().replace('.', '_')
-        try:
-            self.module = importlib.import_module(
-                'grassprovider.ext.{}'.format(name))
-        except ImportError:
         self.module = None
+        try:
+            extpath = Path(self.descriptionFile).parents[1].joinpath('ext', name + '.py')
+            # this check makes it a bit faster
+            if extpath.exists():
+                spec = importlib.util.spec_from_file_location('grassprovider.ext.' + name, extpath)
+                self.module = importlib.util.module_from_spec(spec)
+                spec.loader.exec_module(self.module)
+        except:
+            pass
 
     def createInstance(self):
         return self.__class__(self.descriptionFile)

python/plugins/grassprovider/Grass7AlgorithmProvider.py

@@ -31,11 +31,12 @@ from qgis.core import (Qgis,
 from processing.core.ProcessingConfig import (ProcessingConfig, Setting)
 from grassprovider.Grass7Utils import Grass7Utils
 from grassprovider.Grass7Algorithm import Grass7Algorithm
-from processing.tools.system import isWindows, isMac
+from processing.tools.system import isWindows, isMac, mkdir
 
 
 class Grass7AlgorithmProvider(QgsProcessingProvider):
-    descriptionFolder = Grass7Utils.grassDescriptionPath()
+    descriptionFolders = Grass7Utils.grassDescriptionFolders()
+    mkdir(descriptionFolders[0])
 
     def __init__(self):
         super().__init__()
@@ -85,7 +86,8 @@ class Grass7AlgorithmProvider(QgsProcessingProvider):
 
     def createAlgsList(self):
         algs = []
-        folder = self.descriptionFolder
+        folders = self.descriptionFolders
+        for folder in folders:
             for descriptionFile in os.listdir(folder):
                 if descriptionFile.endswith('txt'):
                     try:

python/plugins/grassprovider/Grass7Utils.py

@@ -254,8 +254,8 @@ class Grass7Utils:
         return folder or ''
 
     @staticmethod
-    def grassDescriptionPath():
-        return os.path.join(os.path.dirname(__file__), 'description')
+    def grassDescriptionFolders():
+        return [ os.path.join(userFolder(), 'grassaddons', 'description'), os.path.join(os.path.dirname(__file__), 'description')]
 
     @staticmethod
     def getWindowsCodePage():