[PyQt] Add a lib2to3 custom fix to handle QFileDialog methods in PyQt5

scripts/qgis_fixes/fix_qfiledialog.py

@@ -0,0 +1,46 @@
+# -*- coding: utf-8 -*-
+"""
+Migrate QFileDialog methods from PyQt4 to PyQt5
+"""
+# Author: Médéric Ribreux <mederic.ribreux@medspx.fr>
+# Adapted from fix_pyqt
+# and http://python3porting.com/fixers.html
+
+# Local imports
+from lib2to3.fixer_base import BaseFix
+from lib2to3.fixer_util import Name, Call
+
+class FixQfiledialog(BaseFix):
+
+    PATTERN = """
+    power< 'QFileDialog' trailer< '.' filter=('getOpenFileNameAndFilter'|'getOpenFileNamesAndFilter'|'getSaveFileNameAndFilter') > any >
+    |
+    expr_stmt< filename=any '=' power< any trailer< '(' power< 'QFileDialog' trailer< '.' method=('getOpenFileName'|'getOpenFileNames'|'getSaveFileName') > any > ')' > > >
+    |
+    expr_stmt< filename=any '=' power< 'QFileDialog' trailer< '.' method=('getOpenFileName'|'getOpenFileNames'|'getSaveFileName') > any > >
+    """
+
+    def transform(self, node, results):
+        # First case: getOpen/SaveFileName
+        # We need to add __ variable because in PyQt5
+        # getOpen/SaveFileName returns a tuple
+        if 'filename' in results:
+            node = results['filename']
+            
+            # count number of leaves (result variables)
+            nbLeaves = sum(1 for i in node.leaves())
+
+            # If we have less than two args,
+            # we add __ special variable
+            if nbLeaves < 3:
+                fileName = node.value
+                node.value = u'{}, __'.format(fileName)
+                node.changed()
+                
+        # Rename *AndFilter methods
+        if 'filter' in results:
+            method = results['filter'][0]
+            method.value = method.value.replace(u'AndFilter', u'')
+            method.changed()
+
+