Update config check to use default values dynamically

lexipython/utils.py

@@ -1,5 +1,6 @@
 import os
 import re
+import io
 from urllib import parse
 import pkg_resources
 
@@ -43,12 +44,9 @@ def load_resource(filename, cache={}):
 		cache[filename] = unistr
 	return cache[filename]
 
-def load_config(name):
-	"""
-	Loads values from a Lexicon's config file.
-	"""
+def parse_config_file(f):
+	"""Parses a Lexipython config file."""
 	config = {}
-	with open(os.path.join("lexicon", name, "lexicon.cfg"), "r", encoding="utf8") as f:
 	line = f.readline()
 	while line:
 		# Skim lines until a value definition begins
@@ -66,12 +64,23 @@ def load_config(name):
 			line = f.readline()
 			conf_match = re.match(r"<<<{0}<<<\s+".format(conf), line)
 		if not line:
-				# TODO Not this
-				raise SystemExit("Reached EOF while reading config value {}".format(conf))
+			raise EOFError("Reached EOF while reading config value {}".format(conf))
 		config[conf] = conf_value.strip()
-	# Check that all necessary values were configured
-	for config_value in ['LEXICON_TITLE', 'PROMPT', 'SESSION_PAGE', "INDEX_LIST"]:
-		if config_value not in config:
-			# TODO Not this either
-			raise SystemExit("Error: {} not set in lexipython.cfg".format(config_value))
+	return config
+
+def load_config(name):
+	"""
+	Loads values from a Lexicon's config file.
+	"""
+	with open(os.path.join("lexicon", name, "lexicon.cfg"), "r", encoding="utf8") as f:
+		config = parse_config_file(f)
+	# Check that no values are missing that are present in the default config
+	with io.StringIO(load_resource("lexicon.cfg")) as f:
+		default_config = parse_config_file(f)
+	missing_keys = []
+	for key in default_config.keys():
+		if key not in config:
+			missing_keys.append(key)
+	if missing_keys:
+		raise KeyError("{} missing config values for: {}".format(name, " ".join(missing_keys)))
 	return config