Veronica K. B. Olsen
274 lines
8.7 KiB
Python
274 lines
8.7 KiB
Python
# -*- coding: utf-8 -*-
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"""
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novelWriter – Project Document
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==============================
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Data class for a single novelWriter document
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File History:
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Created: 2018-09-29 [0.0.1]
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This file is a part of novelWriter
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Copyright 2018–2021, Veronica Berglyd Olsen
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>.
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"""
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import logging
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import os
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from functools import partial
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from PyQt5.QtCore import QCoreApplication
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from nw.constants import nwAlert
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from nw.common import isHandle
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from nw.constants import nwItemLayout, nwItemClass
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logger = logging.getLogger(__name__)
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class NWDoc():
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def __init__(self, theProject, theParent):
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self.theProject = theProject
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self.theParent = theParent
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# Internal Variables
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self._theItem = None # The currently open item
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self._docHandle = None # The handle of the currently open item
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self._fileLoc = None # The file location of the currently open item
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self._docMeta = {} # The meta data of the currently open item
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# Internal Mapping
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self.makeAlert = self.theParent.makeAlert
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self.tr = partial(QCoreApplication.translate, "NWDoc")
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return
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##
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# Class Methods
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##
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def clearDocument(self):
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"""Clear the document contents.
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"""
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self._theItem = None
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self._docHandle = None
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self._fileLoc = None
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self._docMeta = {}
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return
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def openDocument(self, tHandle, showStatus=True, isOrphan=False):
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"""Open a document from handle, capturing potential file system
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errors and parse meta data. If the document doesn't exist on
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disk, return an empty string. If something went wrong, return
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None.
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"""
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if not isHandle(tHandle):
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return None
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# Always clear first, since the object will often be reused.
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self.clearDocument()
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self._docHandle = tHandle
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if not isOrphan:
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self._theItem = self.theProject.projTree[tHandle]
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else:
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self._theItem = None
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if self._theItem is None and not isOrphan:
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self.clearDocument()
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return None
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docFile = self._docHandle+".nwd"
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logger.debug("Opening document %s" % docFile)
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docPath = os.path.join(self.theProject.projContent, docFile)
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self._fileLoc = docPath
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theText = ""
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self._docMeta = {}
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if os.path.isfile(docPath):
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try:
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with open(docPath, mode="r", encoding="utf8") as inFile:
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# Check the first <= 10 lines for metadata
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for i in range(10):
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inLine = inFile.readline()
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if inLine.startswith(r"%%~"):
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self._parseMeta(inLine)
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else:
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theText = inLine
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break
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# Load the rest of the file
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theText += inFile.read()
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except Exception as e:
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self.makeAlert([self.tr("Failed to open document file."), str(e)], nwAlert.ERROR)
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# Note: Document must be cleared in case of an io error,
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# or else the auto-save or save will try to overwrite it
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# with an empty file. Return None to alert the caller.
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self.clearDocument()
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return None
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else:
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# The document file does not exist, so we assume it's a new
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# document and initialise an empty text string.
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logger.debug("The requested document does not exist.")
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return ""
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if showStatus and not isOrphan:
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self.theParent.setStatus(
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self.tr("{0}: {1}").format(
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self.tr("Opened Document"), self._theItem.itemName
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)
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)
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return theText
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def saveDocument(self, docText):
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"""Save the document. The file is saved via a temp file in case
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of save failure. Returns True if successful, False if not.
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"""
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if self._docHandle is None:
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return False
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self.theProject.ensureFolderStructure()
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docFile = self._docHandle+".nwd"
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logger.debug("Saving document %s" % docFile)
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docPath = os.path.join(self.theProject.projContent, docFile)
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docTemp = os.path.join(self.theProject.projContent, docFile+"~")
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# DocMeta line
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if self._theItem is None:
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docMeta = ""
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else:
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docMeta = (
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f"%%~name: {self._theItem.itemName}\n"
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f"%%~path: {self._theItem.itemParent}/{self._theItem.itemHandle}\n"
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f"%%~kind: {self._theItem.itemClass.name}/{self._theItem.itemLayout.name}\n"
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)
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try:
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with open(docTemp, mode="w", encoding="utf8") as outFile:
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outFile.write(docMeta)
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outFile.write(docText)
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except Exception as e:
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self.makeAlert([self.tr("Could not save document."), str(e)], nwAlert.ERROR)
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return False
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# If we're here, the file was successfully saved, so we can
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# replace the temp file with the actual file
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if os.path.isfile(docPath):
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os.unlink(docPath)
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os.rename(docTemp, docPath)
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if self._theItem is not None:
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self.theParent.setStatus(
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self.tr("{0}: {1}").format(
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self.tr("Saved Document"), self._theItem.itemName
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)
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)
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return True
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def deleteDocument(self, tHandle):
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"""Permanently delete a document source file and related files
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from the project data folder.
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"""
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if not isHandle(tHandle):
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return False
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docFile = tHandle+".nwd"
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chkList = []
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chkList.append(os.path.join(self.theProject.projContent, docFile))
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chkList.append(os.path.join(self.theProject.projContent, docFile+"~"))
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for chkFile in chkList:
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if os.path.isfile(chkFile):
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try:
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os.unlink(chkFile)
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logger.debug("Deleted: %s" % chkFile)
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except Exception as e:
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self.makeAlert(
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[self.tr("Could not delete document file."), str(e)], nwAlert.ERROR
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)
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return False
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return True
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##
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# Getters
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##
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def getFileLocation(self):
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"""Return the file location of the current file.
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"""
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return self._fileLoc
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def getCurrentItem(self):
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"""Return a pointer to the currently open item.
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"""
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return self._theItem
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def getMeta(self):
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"""Parses the document meta tag and returns the path and name as
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a list and a string.
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"""
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theName = self._docMeta.get("name", "")
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theParent = self._docMeta.get("parent", None)
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theClass = self._docMeta.get("class", None)
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theLayout = self._docMeta.get("layout", None)
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return theName, theParent, theClass, theLayout
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##
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# Internal Functions
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##
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def _parseMeta(self, metaLine):
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"""Parse a line from the document statting with the characters
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%%~ that may contain meta data.
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"""
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if metaLine.startswith("%%~name:"):
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self._docMeta["name"] = metaLine[8:].strip()
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elif metaLine.startswith("%%~path:"):
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metaVal = metaLine[8:].strip()
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metaBits = metaVal.split("/")
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if len(metaBits) == 2:
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if isHandle(metaBits[0]):
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self._docMeta["parent"] = metaBits[0]
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if isHandle(metaBits[1]):
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self._docMeta["handle"] = metaBits[1]
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elif metaLine.startswith("%%~kind:"):
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metaVal = metaLine[8:].strip()
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metaBits = metaVal.split("/")
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if len(metaBits) == 2:
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if metaBits[0] in nwItemClass.__members__:
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self._docMeta["class"] = nwItemClass[metaBits[0]]
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if metaBits[1] in nwItemLayout.__members__:
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self._docMeta["layout"] = nwItemLayout[metaBits[1]]
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else:
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logger.debug("Ignoring meta data: '%s'" % metaLine.strip())
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return
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# END Class NWDoc
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