feat: complete kyofilter with CUPS main() entrypoint

filter/kyofilter

@@ -43,5 +43,23 @@ def process_stream(lines, account_code):
         sys.stderr.write("kyofilter: WARNING: no injection point found in PostScript stream\n")
 
 
+
+def main():
+    if len(sys.argv) < 6:
+        sys.stderr.write("Usage: kyofilter job-id user title copies options [file]\n")
+        sys.exit(1)
+
+    options = parse_options(sys.argv[5])
+    account_code = get_account_code(options)
+
+    infile = open(sys.argv[6], 'rb') if len(sys.argv) > 6 else sys.stdin.buffer
+    try:
+        for chunk in process_stream(infile, account_code):
+            sys.stdout.buffer.write(chunk)
+    finally:
+        if len(sys.argv) > 6:
+            infile.close()
+
+
 if __name__ == '__main__':
-    pass
+    main()