fea: Add file handler for log output

Signed-off-by: Helio Chissini de Castro <[email protected]>

Author: heliocastro

src/python_inspector/logging.py

@@ -8,6 +8,7 @@
 #
 
 import logging
+from pathlib import Path
 from types import TracebackType
 from typing import Any, Optional, Tuple, Type, Union
 
@@ -75,7 +76,7 @@ def deep(
     logging.Logger.deep = deep
 
 
-def setup_logger(level: str = "WARNING") -> None:
+def setup_logger(level: str = "WARNING", log_file: Optional[Path] = None) -> None:
     """
     Configures the logger for the 'python-inspector' application.
 
@@ -101,6 +102,11 @@ def setup_logger(level: str = "WARNING") -> None:
         handler.setFormatter(formatter)
         _logger.addHandler(handler)
 
+        if log_file:
+            file_handler = logging.FileHandler(log_file, encoding="utf-8")
+            file_handler.setFormatter(formatter)
+            logger.addHandler(file_handler)
+
 
 # Logger as a singleton
 logger: logging.Logger = logging.getLogger("python-inspector")

src/python_inspector/resolve_cli.py

@@ -9,7 +9,8 @@
 # See https://aboutcode.org for more information about nexB OSS projects.
 #
 
-from typing import Dict
+from pathlib import Path
+from typing import Dict, Optional
 
 import click
 
@@ -187,6 +188,9 @@ def print_version(ctx, param, value):
     help="Use generic or truncated paths in the JSON output header and files sections. "
     "Used only for testing to avoid absolute paths and paths changing at each run.",
 )
+@click.option(
+    "--log-file", type=click.Path(path_type=Path), help="Write logs to a file."
+)
 def resolve_dependencies(
     ctx,
     requirement_files,
@@ -200,6 +204,7 @@ def resolve_dependencies(
     netrc_file,
     max_rounds,
     verbose,
+    log_file: Optional[Path],
     use_cached_index=False,
     use_pypi_json_api=False,
     analyze_setup_py_insecurely=False,
@@ -240,15 +245,15 @@ def resolve_dependencies(
 
     # Setup verbose level
     if verbose >= 4:
-        logging.setup_logger("DEEP")
+        logging.setup_logger("DEEP", log_file=log_file)
     elif verbose == 3:
-        logging.setup_logger("TRACE")
+        logging.setup_logger("TRACE", log_file=log_file)
     elif verbose == 2:
-        logging.setup_logger("DEBUG")
+        logging.setup_logger("DEBUG", log_file=log_file)
     elif verbose == 1:
-        logging.setup_logger("INFO")
+        logging.setup_logger("INFO", log_file=log_file)
     else:
-        logging.setup_logger()
+        logging.setup_logger(log_file=log_file)
 
     options = get_pretty_options(ctx, generic_paths=generic_paths)