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# This file is part of the Frescobaldi project, http://www.frescobaldi.org/
#
# Copyright (c) 2008 - 2014 by Wilbert Berendsen
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
# See http://www.gnu.org/licenses/ for more information.
"""
Backup files before overwriting
"""
import os
import shutil
from PyQt5.QtCore import QSettings
def backup(filename):
"""Makes a backup of 'filename'.
Returns True if the backup succeeded.
"""
if filename:
try:
shutil.copy(filename, backupName(filename))
return True
except (IOError, OSError):
pass
return False
def removeBackup(filename):
"""Removes filename's backup unless the user has configured to keep it."""
if filename and not QSettings().value("backup_keep", False, bool):
try:
os.remove(backupName(filename))
except (IOError, OSError):
pass
def scheme():
"""Returns a string that must contain "FILE".
Replacing that part yields the backup name.
"""
s = QSettings().value("backup_scheme", "FILE~")
assert 'FILE' in s and s != 'FILE'
return s
def backupName(filename):
"""Returns the backup file name for the given filename."""
return scheme().replace("FILE", filename)
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