--- a/cutils/treesum.py	Tue Apr 01 16:31:20 2025 +0200
+++ b/cutils/treesum.py	Tue Apr 01 18:49:27 2025 +0200
@@ -330,6 +330,9 @@
             else:
                 parser.print_help()
         return 0
+    elif opts.subcommand == "patterns":
+        patparser.print_help()
+        return 0
 
     # Reparse strictly
     opts = parser.parse_args(args=argv)
@@ -342,7 +345,7 @@
     )
     logging.captureWarnings(True)
 
-    return treesum(opts, patparser=patparser)
+    return treesum(opts)
 
 
 FollowSymlinkConfig = collections.namedtuple("FollowSymlinkConfig",
@@ -517,17 +520,19 @@
     return opts
 
 
-def treesum(opts, patparser=None):
+def treesum(opts):
     # XXX TBD: opts.check and opts.checklist (as in shasum.py)
     if opts.subcommand in ("generate", "gen"):
         return generate_treesum(opts)
     elif opts.subcommand == "info":
         return print_treesum_digestfile_infos(opts)
-    elif opts.subcommand == "patterns":
-        patparser.print_help()
     else:
+        #
+        # NOTE: Subcommands for printing help (e.g. "patterns") should
+        # be handled in the caller.
+        #
         raise RuntimeError(
-            "command `{}' not yet handled".format(opts.subcommand))
+            "command `{}' not handled".format(opts.subcommand))
 
 
 def generate_treesum(opts):