Further progress

main.py

@@ -1,17 +1,12 @@
 import sys
 import preprocessor
-import token
 
 if len(sys.argv) < 2:
     print("Usage: hgc (file)")
     exit(1)
 
-file = open(sys.argv[1]).readlines()
-
-lines: list[token.tokenlist] = []
-
-for line in file:
-    lines.append(preprocessor.process_line(line))
+with open(sys.argv[1], "r") as file:
+    lines = [preprocessor.process_line(line) for line in file]
 
 for line in lines:
     print(line)