[processing] fix handling for stdout and file outputs in GRASS

algorithms when temporary files are used

(cherry picked from commit b5d323c)

python/plugins/processing/algs/grass7/Grass7Algorithm.py

@@ -116,6 +116,7 @@ def __init__(self, descriptionfile):
         self.commands = []
         self.outputCommands = []
         self.exportedLayers = {}
+        self.fileOutputs = {}
         self.descriptionFile = descriptionfile
 
         # Default GRASS parameters
@@ -398,6 +399,7 @@ def processAlgorithm(self, original_parameters, context, feedback):
         self.commands = []
         self.outputCommands = []
         self.exportedLayers = {}
+        self.fileOutputs = {}
 
         # If GRASS session has been created outside of this algorithm then
         # get the list of layers loaded in GRASS otherwise start a new
@@ -442,9 +444,12 @@ def processAlgorithm(self, original_parameters, context, feedback):
         for out in self.outputDefinitions():
             outName = out.name()
             if outName in parameters:
-                outputs[outName] = parameters[outName]
+                if outName in self.fileOutputs:
+                    outputs[outName] = self.fileOutputs[outName]
+                else:
+                    outputs[outName] = parameters[outName]
                 if isinstance(out, QgsProcessingOutputHtml):
-                    self.convertToHtml(parameters[outName])
+                    self.convertToHtml(self.fileOutputs[outName])
 
         return outputs
 
@@ -643,23 +648,18 @@ def processCommand(self, parameters, context, feedback, delOutputs=False):
                 # For File destination
                 if isinstance(out, QgsProcessingParameterFileDestination):
                     if outName in parameters and parameters[outName] is not None:
+                        outPath = self.parameterAsFileOutput(parameters, outName, context)
+                        self.fileOutputs[outName] = outPath
                         # for HTML reports, we need to redirect stdout
                         if out.defaultFileExtension().lower() == 'html':
                             if outName == 'html':
                                 # for "fake" outputs redirect command stdout
-                                command += ' > "{}"'.format(
-                                    self.parameterAsFileOutput(
-                                        parameters, outName, context)
-                                )
+                                command += ' > "{}"'.format(outPath)
                             else:
                                 # for real outputs only output itself should be redirected
-                                command += ' {}=- > "{}"'.format(
-                                    outName,
-                                    self.parameterAsFileOutput(parameters, outName, context))
+                                command += ' {}=- > "{}"'.format(outName, outPath)
                         else:
-                            command += ' {}="{}"'.format(
-                                outName,
-                                self.parameterAsFileOutput(parameters, outName, context))
+                            command += ' {}="{}"'.format(outName, outPath)
                 # For folders destination
                 elif isinstance(out, QgsProcessingParameterFolderDestination):
                     # We need to add a unique temporary basename