Load change log from file for on-boarding page

cura/UI/TextManager.py

@@ -0,0 +1,64 @@
+# Copyright (c) 2019 Ultimaker B.V.
+# Cura is released under the terms of the LGPLv3 or higher.
+
+import collections
+from typing import Optional
+
+from PyQt5.QtCore import QObject, pyqtSlot
+
+from UM.Resources import Resources
+from UM.Version import Version
+
+
+#
+# This manager provides means to load texts to QML.
+#
+class TextManager(QObject):
+
+    def __init__(self, parent: Optional["QObject"] = None) -> None:
+        super().__init__(parent)
+
+        self._change_log_text = ""
+
+    @pyqtSlot(result = str)
+    def getChangeLogText(self) -> str:
+        if not self._change_log_text:
+            self._change_log_text = self._loadChangeLogText()
+        return self._change_log_text
+
+    def _loadChangeLogText(self) -> str:
+        # Load change log texts and organize them with a dict
+        file_path = Resources.getPath(Resources.Texts, "change_log.txt")
+        change_logs_dict = {}
+        with open(file_path, "r", encoding = "utf-8") as f:
+            open_version = None
+            open_header = ""  # Initialise to an empty header in case there is no "*" in the first line of the changelog
+            for line in f:
+                line = line.replace("\n", "")
+                if "[" in line and "]" in line:
+                    line = line.replace("[", "")
+                    line = line.replace("]", "")
+                    open_version = Version(line)
+                    open_header = ""
+                    change_logs_dict[open_version] = collections.OrderedDict()
+                elif line.startswith("*"):
+                    open_header = line.replace("*", "")
+                    change_logs_dict[open_version][open_header] = []
+                elif line != "":
+                    if open_header not in change_logs_dict[open_version]:
+                        change_logs_dict[open_version][open_header] = []
+                    change_logs_dict[open_version][open_header].append(line)
+
+        # Format changelog text
+        content = ""
+        for version in change_logs_dict:
+            content += "<h1>" + str(version) + "</h1><br>"
+            content += ""
+            for change in change_logs_dict[version]:
+                if str(change) != "":
+                    content += "<b>" + str(change) + "</b><br>"
+                for line in change_logs_dict[version][change]:
+                    content += str(line) + "<br>"
+                content += "<br>"
+
+        return content