Implement support for custom rclone config path

.gitignore

@@ -7,3 +7,4 @@ rclone_python/__pycache__/
 rclone_python/scripts/__pycache__
 tests/__pycache__
 .vscode/
+*.conf

README.md

@@ -134,6 +134,19 @@ print(rclone.check("data", "box:data"))
 (False, [('*', 'video1.webm'), ('=', 'video2.webm'), ('=', 'video2.webm')])
 ```
 
+### Custom config file
+You can define a custom file which rclone shall use by setting it up before running any command.
+Example with a config file named ".rclone.conf" in current working directory:
+```python
+import pathlib
+from rclone_python import rclone
+
+CONFIG_FILE = pathlib.Path(__file__).parent / ".rclone.conf"
+
+rclone.set_config_file(CONFIG_FILE)
+# All upcoming rclone commands will use custom config file
+```
+
 ## Custom Progressbar
 You can use your own rich progressbar with all transfer operations.
 This allows you to customize the columns to be displayed.

rclone_python/rclone.py

@@ -25,6 +25,11 @@ def wrapper(*args, **kwargs):
     return wrapper
 
 
+def set_config_file(config_file: str):
+    """Change the config file used by this wrapper."""
+    utils.Config(config_file)
+
+
 def set_log_level(level: int):
     """Change the log level of this wrapper.
 

rclone_python/utils.py

@@ -28,6 +28,25 @@ def __init__(self, description, error_msg):
 # ---------------------------------------------------------------------------- #
 
 
+class Config:
+    """Config set up as singleton"""
+
+    _instance = None
+    _initialized = False
+    config_path = None
+
+    def __new__(cls, *args, **kwargs):
+        """Create a new instance of the Config class if it doesn't exist yet."""
+        if cls._instance is None:
+            cls._instance = super().__new__(cls)
+        return cls._instance
+
+    def __init__(self, config_path: Union[str, Path] = None):
+        if not self._initialized:
+            self.config_path = config_path
+            self.__class__._initialized = True
+
+
 def args2string(args: List[str]) -> str:
     # separate flags/ named arguments by a space
     if args:
@@ -43,9 +62,18 @@ def run_rclone_cmd(
     encoding="utf-8",
     raise_errors: bool = True,
 ) -> Union[Tuple[str, str], Tuple[int, str, str]]:
+
+    # Set the config path if defined by the user,
+    # otherwise the default rclone config path is used:
+    config = Config()
+    if config.config_path is not None:
+        base_command = f"rclone --config={config.config_path}"
+    else:
+        base_command = "rclone"
+
     # add optional arguments and flags to the command
     args_str = args2string(args)
-    full_command = f"rclone {command} {args_str}"
+    full_command = f"{base_command} {command} {args_str}"
 
     logger.debug(f"Running command: {full_command}")
 
@@ -101,6 +129,12 @@ def rclone_progress(
     subprocesses = {}
     errors = []
 
+    # Set the config path if defined by the user,
+    # otherwise the default rclone config path is used:
+    config = Config()
+    if config.config_path is not None:
+        command += f' --config="{config.config_path}"'
+
     if show_progress:
         if pbar is None:
             pbar = create_progress_bar()