Split profiles into multiple if new printer has material profiles

If the old profile didn't specify any material, it would be global. But if the new machine specifies that its profiles are material-specific, these profiles have to be split into multiple profiles in order to be able to show them in Cura 2.2.

Contributes to issue CURA-844.

plugins/VersionUpgrade/VersionUpgrade21to22/Profile.py

@@ -2,10 +2,30 @@
 # Cura is released under the terms of the AGPLv3 or higher.
 
 import configparser #To read config files.
+import copy #To split config files into multiple config files.
 import io #To write config files to strings as if they were files.
 
 import UM.VersionUpgrade
 
+##  Which machines have material-specific profiles in the new version?
+#
+#   These are the 2.1 machine identities with "has_machine_materials": true in
+#   their definitions in Cura 2.2. So these are the machines for which profiles
+#   need to split into multiple profiles, one for each material.
+#
+#   This should contain the definition as they are stated in the profiles. The
+#   inheritance structure cannot be found at this stage, since the definitions
+#   may have changed in later versions than 2.2.
+_machines_with_machine_quality = {"ultimaker2plus", "ultimaker2_extended_plus"}
+
+##  The materials in Cura 2.2.
+#
+#   This is required to know how to split old profiles if the old machine didn't
+#   have material-specific profiles but the new machine has. This cannot be read
+#   from the current source directory since the current source directory may be
+#   a later version than Cura 2.2, so it must be stored in the upgrade plug-in.
+_new_materials = {"generic_abs", "generic_cpe", "generic_pla", "generic_pva"}
+
 ##  Creates a new profile instance by parsing a serialised profile in version 1
 #   of the file format.
 #
@@ -105,8 +125,6 @@ class Profile:
                 config.set("metadata", "variant", VersionUpgrade21to22.VersionUpgrade21to22.VersionUpgrade21to22.translateVariant(self._machine_variant_name, self._machine_type_id))
             else:
                 config.set("metadata", "variant", self._machine_variant_name)
-        if self._material_name and self._type != "material":
-            config.set("metadata", "material", self._material_name)
 
         if self._settings:
             VersionUpgrade21to22.VersionUpgrade21to22.VersionUpgrade21to22.translateSettings(self._settings)
@@ -128,6 +146,24 @@ class Profile:
             for item in disabled_settings_defaults[1:]:
                 disabled_defaults_string += "," + str(item)
 
-        output = io.StringIO()
-        config.write(output)
-        return [self._filename], [output.getvalue()]
+        #Material metadata may cause the file to split, so do it last to minimise processing time (do more with the copy).
+        filenames = []
+        configs = []
+        if self._material_name and self._type != "material":
+            config.set("metadata", "material", self._material_name)
+            filenames.append(self._filename)
+            configs.append(config)
+        elif self._type != "material" and self._machine_type_id in _machines_with_machine_quality:
+            #Split this profile into multiple profiles, one for each material.
+            for material_id in _new_materials:
+                filenames.append("{profile}_{material}".format(profile = self._filename, material = material_id))
+                config_copy = copy.copy(config)
+                config_copy.set("metadata", "material", material_id)
+                configs.append(config_copy)
+
+        outputs = []
+        for config in configs:
+            output = io.StringIO()
+            config.write(output)
+            outputs.append(output.getvalue())
+        return filenames, outputs