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+# Copyright (c) 2017 Ultimaker B.V.
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+# Cura is released under the terms of the AGPLv3 or higher.
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+
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+import configparser #To parse preference files.
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+import io #To serialise the preference files afterwards.
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+
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+from UM.VersionUpgrade import VersionUpgrade #We're inheriting from this.
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+
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+_renamed_themes = {
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+ "cura": "cura-light"
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+}
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+
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+class VersionUpgrade27to30(VersionUpgrade):
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+ ## Gets the version number from a CFG file in Uranium's 2.7 format.
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+ #
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+ # Since the format may change, this is implemented for the 2.7 format only
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+ # and needs to be included in the version upgrade system rather than
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+ # globally in Uranium.
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+ #
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+ # \param serialised The serialised form of a CFG file.
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+ # \return The version number stored in the CFG file.
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+ # \raises ValueError The format of the version number in the file is
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+ # incorrect.
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+ # \raises KeyError The format of the file is incorrect.
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+ def getCfgVersion(self, serialised):
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+ parser = configparser.ConfigParser(interpolation = None)
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+ parser.read_string(serialised)
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+ format_version = int(parser.get("general", "version")) #Explicitly give an exception when this fails. That means that the file format is not recognised.
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+ setting_version = int(parser.get("metadata", "setting_version", fallback = 0))
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+ return format_version * 1000000 + setting_version
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+
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+ ## Upgrades a preferences file from version 2.7 to 3.0.
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+ #
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+ # \param serialised The serialised form of a preferences file.
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+ # \param filename The name of the file to upgrade.
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+ def upgradePreferences(self, serialised, filename):
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+ parser = configparser.ConfigParser(interpolation=None)
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+ parser.read_string(serialised)
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+
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+ # Update version numbers
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+ if "general" not in parser:
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+ parser["general"] = {}
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+ parser["general"]["version"] = "5"
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+ if "metadata" not in parser:
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+ parser["metadata"] = {}
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+ parser["metadata"]["setting_version"] = "2"
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+
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+ #Renamed themes.
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+ if "theme" in parser["general"]:
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+ if parser["general"]["theme"] in _renamed_themes:
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+ parser["general"]["theme"] = _renamed_themes[parser["general"]["theme"]]
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+
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+ # Re-serialise the file.
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+ output = io.StringIO()
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+ parser.write(output)
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+ return [filename], [output.getvalue()]
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