Added error log file

Signed-off-by: Dimitris Zlatanidis <d.zlatanidis@gmail.com>

slpkg/configs.py

@@ -31,6 +31,7 @@ class Configs:  # pylint: disable=[R0902]
     deps_log_file: Path = Path(log_path, 'deps.log')
     slpkg_log_file: Path = Path(log_path, 'slpkg.log')
     upgrade_log_file: Path = Path(log_path, 'upgrade.log')
+    error_log_file: Path = Path(log_path, 'error.log')
 
     os_arch: str = platform.machine()
     file_list_suffix: str = '.pkgs'

slpkg/main.py

@@ -3,6 +3,7 @@
 
 
 import sys
+import logging
 from pathlib import Path
 from signal import signal, SIGPIPE, SIG_DFL
 
@@ -768,6 +769,13 @@ def main() -> None:
     Raises:
         SystemExit: Exit code 0.
     """
+    # Configure logging
+    if Configs.error_log_file.is_file():
+        Configs.error_log_file.unlink()
+
+    logging.basicConfig(filename=Configs.error_log_file, level=logging.ERROR,
+                        format='%(asctime)s - %(levelname)s - %(message)s')
+
     args: list = sys.argv
     args.pop(0)
     usage = Usage()
@@ -825,6 +833,7 @@ def main() -> None:
     try:
         arguments[args[0]]()
     except (KeyError, IndexError):
+        logging.error("Exception occurred", exc_info=True)
         usage.help_short(1)
     except KeyboardInterrupt as e:
         raise SystemExit(1) from e