[processing][grass] Fix bad move/copy paths in grass i.gensig/maxlik algs

Refs #19539

Author: nyalldawson

python/plugins/processing/algs/grass7/ext/i.py

@@ -28,6 +28,7 @@
 import os
 from processing.tools.system import (isWindows, getTempFilename)
 from processing.algs.grass7.Grass7Utils import Grass7Utils
+from qgis.PyQt.QtCore import QDir
 from qgis.core import QgsProcessingParameterString
 from qgis.core import QgsMessageLog
 
@@ -191,29 +192,29 @@ def verifyRasterNum(alg, parameters, context, rasters, mini, maxi=None):
 def createDestDir(alg, toFile):
     """ Generates an mkdir command for GRASS7 script """
     # Creates the destination directory
-    command = "{} {}".format(
+    command = "{} \"{}\"".format(
         "MD" if isWindows() else "mkdir -p",
-        os.path.dirname(toFile)
+        QDir.toNativeSeparators(os.path.dirname(toFile))
     )
     alg.commands.append(command)
 
 
 def moveFile(alg, fromFile, toFile):
     """ Generates a move command for GRASS7 script """
     createDestDir(alg, toFile)
-    command = "{} {} {}".format(
+    command = "{} \"{}\" \"{}\"".format(
         "MOVE /Y" if isWindows() else "mv -f",
-        fromFile,
-        toFile
+        QDir.toNativeSeparators(fromFile),
+        QDir.toNativeSeparators(toFile)
     )
     alg.commands.append(command)
 
 
 def copyFile(alg, fromFile, toFile):
     """ Generates a copy command for GRASS7 script """
     createDestDir(alg, toFile)
-    command = "{} {} {}".format(
+    command = "{} \"{}\" \"{}\"".format(
         "COPY /Y" if isWindows() else "cp -f",
-        fromFile,
-        toFile)
+        QDir.toNativeSeparators(fromFile),
+        QDir.toNativeSeparators(toFile))
     alg.commands.append(command)