From cc68ba79329e75d68f842f4ce0bb83601936097d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Dani=C3=ABl=20van=20Noord?=
 <13665637+DanielNoord@users.noreply.github.com>
Date: Mon, 19 Sep 2022 13:09:05 +0200
Subject: [PATCH 1/3] Accept a comma-separated list of messages IDs in
 ``--help-msg``

---
 doc/whatsnew/fragments/7471.bugfix | 3 +++
 pylint/config/callback_actions.py  | 2 ++
 tests/test_self.py                 | 1 +
 3 files changed, 6 insertions(+)
 create mode 100644 doc/whatsnew/fragments/7471.bugfix

diff --git a/doc/whatsnew/fragments/7471.bugfix b/doc/whatsnew/fragments/7471.bugfix
new file mode 100644
index 0000000000..b1b6f369c9
--- /dev/null
+++ b/doc/whatsnew/fragments/7471.bugfix
@@ -0,0 +1,3 @@
+``--help-msg`` now accepts a comma-separated list of message IDs again.
+
+Closes #7471
diff --git a/pylint/config/callback_actions.py b/pylint/config/callback_actions.py
index e2a6017e91..d8b8b3624a 100644
--- a/pylint/config/callback_actions.py
+++ b/pylint/config/callback_actions.py
@@ -158,6 +158,8 @@ def __call__(
         option_string: str | None = "--help-msg",
     ) -> None:
         assert isinstance(values, (list, tuple))
+        assert isinstance(values[0], str)
+        values = values[0].split(",")
         self.run.linter.msgs_store.help_message(values)
         sys.exit(0)
 
diff --git a/tests/test_self.py b/tests/test_self.py
index 292a4b95de..d5167cfe67 100644
--- a/tests/test_self.py
+++ b/tests/test_self.py
@@ -1229,6 +1229,7 @@ def test_output_of_callback_options(
             [["--help-msg", "W0101"], ":unreachable (W0101)", False],
             [["--help-msg", "WX101"], "No such message id", False],
             [["--help-msg"], "--help-msg: expected at least one argumen", True],
+            [["--help-msg", "C0102,C0103"], ":invalid-name (C0103):", False],
         ],
     )
     def test_help_msg(

From 2bc6c10311d6d6f370cc40ec67ba2c32c7cb2703 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Dani=C3=ABl=20van=20Noord?=
 <13665637+DanielNoord@users.noreply.github.com>
Date: Mon, 19 Sep 2022 13:28:19 +0200
Subject: [PATCH 2/3] Fix

---
 pylint/config/callback_actions.py | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/pylint/config/callback_actions.py b/pylint/config/callback_actions.py
index d8b8b3624a..4d52ae870b 100644
--- a/pylint/config/callback_actions.py
+++ b/pylint/config/callback_actions.py
@@ -158,9 +158,11 @@ def __call__(
         option_string: str | None = "--help-msg",
     ) -> None:
         assert isinstance(values, (list, tuple))
-        assert isinstance(values[0], str)
-        values = values[0].split(",")
-        self.run.linter.msgs_store.help_message(values)
+        values_to_print: list[str] = []
+        for msg in values:
+            assert isinstance(msg, str)
+            values_to_print += msg.split(",")
+        self.run.linter.msgs_store.help_message(values_to_print)
         sys.exit(0)
 
 

From 35a5a6f2ff4b010da00a2e40536fa1a144932951 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Dani=C3=ABl=20van=20Noord?=
 <13665637+DanielNoord@users.noreply.github.com>
Date: Mon, 19 Sep 2022 13:29:58 +0200
Subject: [PATCH 3/3] Fix

---
 pylint/config/callback_actions.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pylint/config/callback_actions.py b/pylint/config/callback_actions.py
index 4d52ae870b..a4c6334641 100644
--- a/pylint/config/callback_actions.py
+++ b/pylint/config/callback_actions.py
@@ -161,7 +161,7 @@ def __call__(
         values_to_print: list[str] = []
         for msg in values:
             assert isinstance(msg, str)
-            values_to_print += msg.split(",")
+            values_to_print += utils._check_csv(msg)
         self.run.linter.msgs_store.help_message(values_to_print)
         sys.exit(0)