Improve config class

lib/xmet/config.py

@@ -4,22 +4,48 @@ import configparser
 from typing import Optional, Self
 
 class ConfigException(Exception):
-    ...
+    pass
+
+class ConfigSectionException(ConfigException):
+    def __init__(self, section: str):
+        self.section = section
+
+    def __str__(self):
+        return "Missing configuration section '%s'" % (
+            self.section
+        )
+
+class ConfigOptionException(ConfigException):
+    def __init__(self, section: str, value: str):
+        self.section = section
+        self.value   = value
+
+    def __str__(self):
+        return "Missing configuration value '%s' in section '%s'" % (
+            self.value, self.section
+        )
 
 class ConfigFileException(ConfigException):
-    ...
+    def __init__(self, paths: list):
+        self.paths = paths
+
+    def __str__(self):
+        return "Unable to locate configuration file in: %s" % (
+            ", ".join(self.paths)
+        )
 
 class Config(configparser.ConfigParser):
-    SEARCH_PATHS = (
+    SEARCH_PATHS = [
         './xmet.conf',
         os.environ['HOME'] + '/.xmet.conf',
-        '/etc/xmet/xmet.conf',
+        '/usr/local/etc/xmet/xmet.conf',
-    )
+        '/etc/xmet/xmet.conf'
+    ]
 
     @staticmethod
     def find() -> str:
         for path in Config.SEARCH_PATHS:
-            if os.path.isfile(path):
+            if os.path.exists(path):
                 return path
 
     @staticmethod
@@ -28,9 +54,24 @@ class Config(configparser.ConfigParser):
             path = Config.find()
 
         if path is None:
-            raise ConfigFileException("Could not locate xmet configuration file")
+            raise ConfigFileException(Config.SEARCH_PATHS)
 
         config = Config()
         config.read(path)
 
         return config
+
+    def section(self, section: str):
+        if not self.has_section(section):
+            raise ConfigSectionException(section)
+
+        return self[section]
+
+    def get(self, section: str, option: str, *args, **kwargs):
+        if not self.has_section(section):
+            raise ConfigSectionException(section)
+
+        if not self.has_option(section, option):
+            raise ConfigOptionException(section, option)
+
+        return super().get(section, option, *args, **kwargs)