add better error handling for when source path does not exists

app/config.py

@@ -13,6 +13,15 @@ def yaml_config_settings_source(settings: BaseSettings):
         return yaml.safe_load(fh)
 
 
+def ensure_config_exists():
+    """
+    Ensure config file exist at the path specified in the environment variable CONFIG_PATH.
+    """
+    path = os.getenv("CONFIG_PATH", "config.yaml")
+    if not os.path.exists(path):
+        raise FileNotFoundError(f"Config file not found at {path}")
+
+
 class RegexHeuristics(BaseModel):
     """
     Regex heuristics options for applying modifying a line using regex lines.

app/converter/converter.py

@@ -44,8 +44,9 @@ class Converter:
         """
         source_path = self._jekyll_posts_path
         output_path = Path(self._hugo_posts_path)
-        _, _, files = next(os.walk(source_path))
         posts_converted_count = 0
+        try:
+            _, _, files = next(os.walk(source_path))
             for file in files:
                 source_abs_path = source_path / Path(file)
 
@@ -57,5 +58,6 @@ class Converter:
                     file_writer,
                 )
                 posts_converted_count += 1
-
                 self._logger.info(f"Converted {posts_converted_count} posts! 🚀")
+        except StopIteration:
+            self._logger.fatal(f"Source path {source_path} does not exist!")

main.py

@@ -1,11 +1,12 @@
 import logging
 
-from app.config import Configurator
+from app.config import Configurator, ensure_config_exists
 from app.converter import Converter
 
 
 def main():
     # Configurator
+    ensure_config_exists()
     configurator = Configurator()
 
     # Logging configuration