chore: Create the directory automatically if it doesn't exist #70 (#73)

Create PR for #70

This PR is add decorator and test code for create new folder if it dose
not exist.
```python
def create_folder_if_not_exists(func: Any) -> Callable[..., int]:
    """Decorator to create folder if it does not exist."""

    def wrapper(*args: Any, **kwargs: Any) -> int:
        try:
            filepath = kwargs["filepath"]
        except KeyError:
            filepath = args[0]
        folder = os.path.dirname(filepath)
        if not os.path.exists(folder) and folder != "":
            os.makedirs(folder)
        return func(*args, **kwargs)

    return wrapper
```
The reason why the try except statement is used is because other methods
that call the write_csv function sometimes pass the filepath into args
and sometimes kwarg.

usage
```python
@create_folder_if_not_exists
def write_csv(filepath: Path, records: List[dict], schema: dict, **kwargs: Any) -> int:
    """Write a CSV file."""
    if "properties" not in schema:
        raise ValueError("Stream's schema has no properties defined.")

    keys: List[str] = list(schema["properties"].keys())
    with open(filepath, "w", encoding="utf-8", newline="") as fp:
        writer = csv.DictWriter(fp, fieldnames=keys, dialect="excel", **kwargs)
        writer.writeheader()
        for record_count, record in enumerate(records, start=1):
            writer.writerow(record)

    return record_count
```
If there is a better way please let me know

---------

Co-authored-by: Edgar Ramírez Mondragón <[email protected]>

target_csv/serialization.py

@@ -1,8 +1,26 @@
 import csv  # noqa: D100
 from pathlib import Path
-from typing import Any, List
+from typing import Any, List, Callable
+import os
 
 
+def create_folder_if_not_exists(func: Any) -> Callable[..., int]:
+    """Decorator to create folder if it does not exist."""
+
+    def wrapper(*args: Any, **kwargs: Any) -> int:
+        try:
+            filepath = kwargs["filepath"]
+        except KeyError:
+            filepath = args[0]
+        folder = os.path.dirname(filepath)
+        if not os.path.exists(folder) and folder != "":
+            os.makedirs(folder)
+        return func(*args, **kwargs)
+
+    return wrapper
+
+
+@create_folder_if_not_exists
 def write_csv(filepath: Path, records: List[dict], schema: dict, **kwargs: Any) -> int:
     """Write a CSV file."""
     if "properties" not in schema:

tests/test_csv.py

@@ -58,11 +58,30 @@ def output_filepath(output_dir) -> Path:
     return result
 
 
+@pytest.fixture
+def test_file_paths(output_dir) -> List[Path]:
+    paths = []
+    for dir in range(4):
+        path = Path(output_dir / f"test-dir-{dir}/csv-test-output-{dir}.csv")
+        if path.exists():
+            path.unlink()
+
+        paths.append(path)
+
+    return paths
+
+
 def test_csv_write(output_filepath) -> None:
     for schema, records in SAMPLE_DATASETS:
         write_csv(filepath=output_filepath, records=records, schema=schema)
 
 
+def test_csv_write_if_not_exists(test_file_paths) -> None:
+    for path in test_file_paths:
+        for schema, records in SAMPLE_DATASETS:
+            write_csv(filepath=path, records=records, schema=schema)
+
+
 def test_csv_roundtrip(output_filepath) -> None:
     for schema, records in SAMPLE_DATASETS:
         write_csv(filepath=output_filepath, records=records, schema=schema)