Add version upgrade that adds empty intent profile to the stacks

CURA-6534

plugins/VersionUpgrade/VersionUpgrade41to42/VersionUpgrade41to42.py

@@ -0,0 +1,42 @@
+##  Upgrades configurations from the state they were in at version 4.1 to the
+#   state they should be in at version 4.2.
+import configparser
+import io
+from typing import Tuple, List
+
+from UM.VersionUpgrade import VersionUpgrade
+
+
+class VersionUpgrade41to42(VersionUpgrade):
+
+    def getCfgVersion(self, serialised: str) -> int:
+        parser = configparser.ConfigParser(interpolation = None)
+        parser.read_string(serialised)
+        format_version = int(parser.get("general", "version")) #Explicitly give an exception when this fails. That means that the file format is not recognised.
+        setting_version = int(parser.get("metadata", "setting_version", fallback = "0"))
+        return format_version * 1000000 + setting_version
+
+    ##  Upgrades stacks to have the new version number.
+    def upgradeStack(self, serialized: str, filename: str) -> Tuple[List[str], List[str]]:
+        parser = configparser.ConfigParser(interpolation=None)
+        parser.read_string(serialized)
+
+        # We should only have 6 levels when we start.
+        assert "7" not in parser["containers"]
+
+        # Update version number.
+        parser["general"]["version"] = "5"
+
+        # We added the intent container in Cura 4.2. This means that all other containers move one step down.
+        parser["containers"]["7"] = parser["containers"]["6"]
+        parser["containers"]["6"] = parser["containers"]["5"]
+        parser["containers"]["5"] = parser["containers"]["4"]
+        parser["containers"]["4"] = parser["containers"]["3"]
+        parser["containers"]["3"] = parser["containers"]["2"]
+        parser["containers"]["2"] = "empty_intent"
+
+        result = io.StringIO()
+        parser.write(result)
+
+        return [filename], [result.getvalue()]
+    

plugins/VersionUpgrade/VersionUpgrade41to42/__init__.py

@@ -0,0 +1,34 @@
+# Copyright (c) 2019 Ultimaker B.V.
+# Cura is released under the terms of the LGPLv3 or higher.
+
+from typing import Any, Dict, TYPE_CHECKING
+
+from . import VersionUpgrade41to42
+
+if TYPE_CHECKING:
+    from UM.Application import Application
+
+upgrade = VersionUpgrade41to42.VersionUpgrade41to42()
+
+def getMetaData() -> Dict[str, Any]:
+    return {
+        "version_upgrade": {
+            # From                           To                              Upgrade function
+            ("machine_stack", 4000007):      ("machine_stack", 5000007,      upgrade.upgradeStack),
+            ("extruder_train", 4000007):     ("extruder_train", 5000007,     upgrade.upgradeStack)
+        },
+        "sources": {
+            "machine_stack": {
+                "get_version": upgrade.getCfgVersion,
+                "location": {"./machine_instances"}
+            },
+            "extruder_train": {
+                "get_version": upgrade.getCfgVersion,
+                "location": {"./extruders"}
+            }
+        }
+    }
+
+
+def register(app: "Application") -> Dict[str, Any]:
+    return {"version_upgrade": upgrade}

plugins/VersionUpgrade/VersionUpgrade41to42/plugin.json

@@ -0,0 +1,8 @@
+{
+    "name": "Version Upgrade 4.1 to 4.2",
+    "author": "Ultimaker B.V.",
+    "version": "1.0.0",
+    "description": "Upgrades configurations from Cura 4.1 to Cura 4.2.",
+    "api": "6.0",
+    "i18n-catalog": "cura"
+}