eric6/MultiProject/MultiProjectFile.py

# -*- coding: utf-8 -*-

# Copyright (c) 2021 Detlev Offenbach <detlev@die-offenbachs.de>
#

"""
Module implementing a class representing the multi project JSON file.
"""

import json
import os
import time
import typing

from PyQt5.QtCore import QObject

from E5Gui import E5MessageBox
from E5Gui.E5OverrideCursor import E5OverridenCursor

import Preferences

MultiProject = typing.TypeVar("MultiProject")


class MultiProjectFile(QObject):
    """
    Class representing the multi project JSON file.
    """
    def __init__(self, multiProject: MultiProject, parent: QObject = None):
        """
        Constructor
        
        @param multiProject reference to the multi project object
        @type MultiProject
        @param parent reference to the parent object (defaults to None)
        @type QObject (optional)
        """
        super(MultiProjectFile, self).__init__(parent)
        self.__multiProject = multiProject
    
    def writeFile(self, filename: str) -> bool:
        """
        Public method to write the multi project data to a multi project
        JSON file.
        
        @param filename name of the multi project file
        @type str
        @return flag indicating a successful write
        @rtype bool
        """
        name = os.path.splitext(os.path.basename(filename))[0]
        
        multiProjectDict = {}
        multiProjectDict["header"] = {
            "comment": f"eric multi project file for multi project {name}",
        }
        
        if Preferences.getMultiProject("TimestampFile"):
            multiProjectDict["header"]["saved"] = (
                time.strftime('%Y-%m-%d, %H:%M:%S')
            )
        
        multiProjectDict["description"] = self.__multiProject.description
        multiProjectDict["projects"] = list(self.__multiProject.getProjects())
        
        try:
            jsonString = json.dumps(multiProjectDict, indent=2)
            with open(filename, "w") as f:
                f.write(jsonString)
        except (TypeError, EnvironmentError) as err:
            with E5OverridenCursor():
                E5MessageBox.critical(
                    None,
                    self.tr("Save Multi Project File"),
                    self.tr(
                        "<p>The multi project file <b>{0}</b> could not be "
                        "written.</p><p>Reason: {1}</p>"
                    ).format(filename, str(err))
                )
                return False
        
        return True
    
    def readFile(self, filename: str) -> bool:
        """
        Public method to read the multi project data from a multi project
        JSON file.
        
        @param filename name of the multi project file
        @type str
        @return flag indicating a successful read
        @rtype bool
        """
        try:
            with open(filename, "r") as f:
                jsonString = f.read()
            multiProjectDict = json.loads(jsonString)
        except (EnvironmentError, json.JSONDecodeError) as err:
            E5MessageBox.critical(
                None,
                self.tr("Read Multi Project File"),
                self.tr(
                    "<p>The multi project file <b>{0}</b> could not be "
                    "read.</p><p>Reason: {1}</p>"
                ).format(filename, str(err))
            )
            return False
        
        self.__multiProject.description = multiProjectDict["description"]
        for project in multiProjectDict["projects"]:
            self.__multiProject.addProject(project)
        
        return True