Add a simple temporary folder

.gitignore

@@ -2,3 +2,5 @@ __pycache__/
 .venv/
 .mypy_cache/
 .tmp/
+.env
+.vscode

PFERD/__init__.py

@@ -1,18 +1,20 @@
 import logging
 
-from .ilias import *
+# from .ilias import *
-from .utils import *
+# from .utils import *
+from .temp_folder import *
 
 STYLE = "{"
 FORMAT = "[{levelname:<7}] {message}"
 DATE_FORMAT = "%F %T"
 
 FORMATTER = logging.Formatter(
-        fmt=FORMAT,
+    fmt=FORMAT,
-        datefmt=DATE_FORMAT,
+    datefmt=DATE_FORMAT,
-        style=STYLE,
+    style=STYLE,
 )
 
+
 def enable_logging(name: str = "PFERD", level: int = logging.INFO) -> None:
     handler = logging.StreamHandler()
     handler.setFormatter(FORMATTER)

PFERD/temp_folder.py

@@ -0,0 +1,56 @@
+"""Helper functions and classes for temporary folders."""
+
+from typing import Optional, Type
+from types import TracebackType
+
+import pathlib
+import shutil
+
+
+class TempFolder():
+    """A temporary folder that can create files or nested temp folders."""
+
+    def __init__(self, path: pathlib.Path):
+        """Create a new temporary folder for the given path."""
+        self.counter = 0
+        self.path = path
+
+    def __str__(self) -> str:
+        """Format the folder as a string."""
+        return f"Folder at {self.path}"
+
+    def __enter__(self) -> 'TempFolder':
+        """Context manager entry function."""
+        return self
+
+    def __exit__(self,
+                 type: Optional[Type[BaseException]],
+                 value: Optional[BaseException],
+                 traceback: Optional[TracebackType]) -> Optional[bool]:
+        """Context manager exit function. Calls cleanup()."""
+        self.cleanup()
+        return None
+
+    def new_file(self) -> pathlib.Path:
+        """Return a unique path inside the folder, but don't create a file."""
+        name = f"tmp-{self.__inc_and_get_counter():03}"
+        return self.path.joinpath(name)
+
+    def new_folder(self, prefix: str = "") -> 'TempFolder':
+        """Create a new nested temporary folder and return its path."""
+        name = f"{prefix if prefix else 'tmp'}-{self.__inc_and_get_counter():03}"
+
+        sub_path = self.path.joinpath(name)
+        sub_path.mkdir(parents=True)
+
+        return TempFolder(sub_path)
+
+    def cleanup(self) -> None:
+        """Delete this folder and all contained files."""
+        shutil.rmtree(self.path.absolute())
+
+    def __inc_and_get_counter(self) -> int:
+        """Get and increment the counter by one."""
+        counter = self.counter
+        self.counter += 1
+        return counter