def maybe_load_file(self):
if self.__class__.presets is not None:
return
try:
f = open(self.path, 'r')
except IOError:
alert("IOError: Preset file doesn't exist. \
A new file is written to %s." % self.path)
self.__class__.presets = {}
self.write_file()
else:
config_string = f.read()
try:
self.__class__.presets = eval(config_string)
except:
alert("There's something wrong with the file. \
A backup is made, and a new file is created")
shutil.copy(self.path, self.path + "~")
self.__class__.presets = {}
def init_document(self):
"""Create a new saving document
If file is not present, not valid xml or not starting with <presets>,
a new file is generated."""
try:
tree = ET.parse(self.path)
except IOError:
alert("IOError: Preset file doesn't exist. A new file is written to %s." % self.path)
if not os.path.exists(os.path.dirname(self.path)):
os.makedirs(os.path.dirname(self.path))
self.create_new_document()
except ExpatError:
alert("ExpatError: Preset file %s is malformed. A backup is made, and a new \
file is created" % self.path)
shutil.copy(self.path, self.path + "~")
self.create_new_document()
else:
self.__class__.root = tree.getroot()
if self.__class__.root.tag != "presets":
alert("Preset file is well-formed, but doesn't seem to contain our presets. A backup is made, and a new file is created" % self.path)
shutil.copy(self.path, self.path + "~")
self.create_new_document()
def save_error(self):
alert("Couldn't save preset file. Please check path, permissions and whatnot.")
def write_file(self):
try:
f = open(self.path, 'w')
except IOError, e:
alert("Couldn't write to file. %s" % e)
