Merge pull request #3183 from DHI-GRAS/release-2_14

[processing] fixes to GrassUtils and Grass7Utils (mostly cherry-picked jef-n)

Author: alexbruy

python/plugins/processing/algs/grass/GrassUtils.py

@@ -91,11 +91,14 @@ def grassPath():
             folder = None
         if folder is None:
             if isWindows():
-                testfolder = os.path.dirname(QgsApplication.prefixPath())
+                if "OSGEO4W_ROOT" in os.environ:
+                    testfolder = os.path.join(unicode(os.environ['OSGEO4W_ROOT']), "apps")
+                else:
+                    testfolder = unicode(QgsApplication.prefixPath())
                 testfolder = os.path.join(testfolder, 'grass')
                 if os.path.isdir(testfolder):
                     for subfolder in os.listdir(testfolder):
-                        if subfolder.startswith('grass'):
+                        if subfolder.startswith('grass-6'):
                             folder = os.path.join(testfolder, subfolder)
                             break
             else:
@@ -110,10 +113,10 @@ def grassWinShell():
         folder = ProcessingConfig.getSetting(GrassUtils.GRASS_WIN_SHELL) or ''
         if not os.path.exists(folder):
             folder = None
-        if folder is None:
+        if folder is None and GrassUtils.grassPath():
             folder = os.path.dirname(unicode(QgsApplication.prefixPath()))
             folder = os.path.join(folder, 'msys')
-        return folder
+        return folder or ''
 
     @staticmethod
     def grassDescriptionPath():

python/plugins/processing/algs/grass7/Grass7Utils.py

@@ -88,7 +88,10 @@ def grassPath():
             folder = None
         if folder is None:
             if isWindows():
-                testfolder = os.path.dirname(unicode(QgsApplication.prefixPath()))
+                if "OSGEO4W_ROOT" in os.environ:
+                    testfolder = os.path.join(unicode(os.environ['OSGEO4W_ROOT']), "apps")
+                else:
+                    testfolder = unicode(QgsApplication.prefixPath())
                 testfolder = os.path.join(testfolder, 'grass')
                 if os.path.isdir(testfolder):
                     for subfolder in os.listdir(testfolder):
@@ -100,7 +103,7 @@ def grassPath():
                 if not os.path.isdir(folder):
                     folder = '/Applications/GRASS-7.0.app/Contents/MacOS'
 
-        return folder
+        return folder or ''
 
     @staticmethod
     def grassDescriptionPath():