misc.path: add chmod, mkdir, and backup

IzzyLib/database/sql.py

@@ -29,6 +29,8 @@ class SqlDatabase:
 		self.SetupCache()
 
 
+	## Leaving link to example code for read-only sqlite for later use
+	## https://github.com/pudo/dataset/issues/136#issuecomment-128693122
 	def __create_engine(self, dbtype, kwargs):
 		engine_args = []
 		engine_kwargs = {}

IzzyLib/misc.py

@@ -398,6 +398,10 @@ class Path(object):
 			raise FileExistsError('File or directory already exists:', target.str())
 
 
+	def __parse_perm_octal(self, mode):
+		return mode if type(mode) == oct else eval(f'0o{mode}')
+
+
 	def size(self):
 		return self.__path.stat().st_size
 
@@ -438,6 +442,11 @@ class Path(object):
 		copyfile(self.str(), target.str())
 
 
+	def backup(self, ext='backup', overwrite=False):
+		target = f'{self.__path.parent}.{ext}'
+		self.copy(target, overwrite)
+
+
 	def move(self, path, overwrite=False):
 		self.copy(path, overwrite=overwrite)
 		self.delete()
@@ -517,10 +526,22 @@ class Path(object):
 		return self
 
 
-	def touch(self, mode=0o666):
-		self.__path.touch(mode, self.exist)
+	def chmod(self, mode=None):
+		octal = self.__parse_perm_octal(mode)
+		self.__path.chmod(octal)
 
-		return True if self.__path.exists() else False
+
+	def touch(self, mode=0o666):
+		octal = __parse_perm_octal(mode)
+		self.__path.touch(octal, self.exist)
+
+		return self.exists()
+
+
+	def mkdir(self):
+		self.__path.mkdir(parents=self.parents, exist_ok=self.exist)
+
+		return self.exists()
 
 
 	def load_json(self):