open-source PythonCaps

Summary:
This Cop is simple and has good pedagogical value, so I'd like to use
it in external talks as well.

Differential Revision: D70659250

fbshipit-source-id: 1b885f8b30e11ff97528a109567d5447c4bca50d

Author: dafyddcrosby

cookstyle/PythonCaps.rb

@@ -0,0 +1,46 @@
+# Copyright (c) 2025-present, Meta Platforms, Inc. and affiliates
+# All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+module RuboCop::Cop::Chef::Meta
+  class PythonCaps < Base
+    extend AutoCorrector
+    MSG = fb_msg('It looks like you are using Python syntax in Ruby, ' +
+    'change to true or false')
+
+    # Check if True or False are included
+    def_node_matcher :casgn_caps_true_false?, <<-PATTERN
+            (casgn nil? {:False :True} _?)
+            PATTERN
+
+    def_node_matcher :const_caps_true_false?, <<-PATTERN
+            (const nil? {:False :True} _?)
+            PATTERN
+
+    def on_casgn(node)
+      expression = casgn_caps_true_false?(node)
+      return unless expression
+      add_offense(node, :severity => :warning)
+    end
+
+    def on_const(node)
+      expression = const_caps_true_false?(node)
+      return unless expression
+      add_offense(node,
+                  :severity => :warning) do |corrector|
+        corrector.replace(node, node.short_name.to_s.downcase)
+      end
+    end
+  end
+end