Merge sessions and tags

nox/_options.py

@@ -64,11 +64,11 @@
 )
 
 
-def _sessions_and_keywords_merge_func(
+def _sessions_merge_func(
  key: str, command_args: argparse.Namespace, noxfile_args: argparse.Namespace
 ) -> list[str]:
- """Only return the Noxfile value for sessions/keywords if neither sessions
- or keywords are specified on the command-line.
+ """Only return the Noxfile value for sessions/keywords if neither sessions,
+ keywords or tags are specified on the command-line.
 
  Args:
  key (str): This function is used for both the "sessions" and "keywords"
@@ -78,7 +78,11 @@ def _sessions_and_keywords_merge_func(
  command-line.
  noxfile_Args (_option_set.Namespace): The options specified in the
  Noxfile."""
- if not command_args.sessions and not command_args.keywords:
+ if (
+ not command_args.sessions
+ and not command_args.keywords
+ and not command_args.tags
+ ):
  return getattr(noxfile_args, key) # type: ignore[no-any-return]
  return getattr(command_args, key) # type: ignore[no-any-return]
 
@@ -260,7 +264,7 @@ def _session_completer(
  "--session",
  group=options.groups["sessions"],
  noxfile=True,
- merge_func=functools.partial(_sessions_and_keywords_merge_func, "sessions"),
+ merge_func=functools.partial(_sessions_merge_func, "sessions"),
  nargs="*",
  default=_sessions_default,
  help="Which sessions to run. By default, all sessions will run.",
@@ -282,7 +286,7 @@ def _session_completer(
  "--keywords",
  group=options.groups["sessions"],
  noxfile=True,
- merge_func=functools.partial(_sessions_and_keywords_merge_func, "keywords"),
+ merge_func=functools.partial(_sessions_merge_func, "keywords"),
  help="Only run sessions that match the given expression.",
  ),
  _option_set.Option(
@@ -291,6 +295,7 @@ def _session_completer(
  "--tags",
  group=options.groups["sessions"],
  noxfile=True,
+ merge_func=functools.partial(_sessions_merge_func, "tags"),
  nargs="*",
  help="Only run sessions with the given tags.",
  ),