Add optional config path arg

README.md

@@ -24,7 +24,11 @@ PyARINC424 is a tool that parses an [ARINC-424](https://en.wikipedia.org/wiki/AR
 - Grid MORA (AS)
 
 ## Config File
-A `config.ini` file must be created in the application `src` directory. 
+By default, the program looks for a `config.ini` file in the application `src` directory.
+You can specify a different config path by passing it as an argument:
+```sh
+python main.py /path/to/my_config.ini
+```
 
 The config can be set up for *either* PostgreSQL or SQLite.
 

src/config.py

@@ -2,9 +2,13 @@
 
 
 class UserConfigs:
-    def __init__(self):
+    def __init__(self, config_file: str = "config.ini"):
         parser = configparser.ConfigParser()
-        parser.read("config.ini")
+        read = parser.read(config_file)
+
+        if not read:
+            raise FileNotFoundError(f"Configuration file {config_file} not found")
+
         validate(parser)
 
         if parser.has_section("postgres"):

src/main.py

@@ -1,10 +1,14 @@
 from arinc import ArincParser
 from config import UserConfigs
 from database import DbConfig, get_db
+import sys
 
 
 def main() -> None:
-    configs: UserConfigs = UserConfigs()
+    if len(sys.argv) > 1:
+        kwargs = {"config_file": sys.argv[1]}
+
+    configs: UserConfigs = UserConfigs(**kwargs)
 
     db: DbConfig = get_db(configs)
 

tests/test_config.py

@@ -177,3 +177,11 @@ def test_invalid_config(self, mock_read):
                 ValueError, match="Missing required PostgreSQL configuration"
             ):
                 UserConfigs()
+
+    @mock.patch("configparser.ConfigParser.read", return_value=[])
+    def test_file_not_found(self, mock_read):
+        """Test __init__ fails when the config file is not found."""
+        with pytest.raises(
+            FileNotFoundError, match="Configuration file missing.ini not found"
+        ):
+            UserConfigs("missing.ini")