1 files changed, 67 insertions, 0 deletions
diff --git a/src/ansiblelint/rules/no_tabs.py b/src/ansiblelint/rules/no_tabs.py
new file mode 100644
index 0000000..c53f1bb
--- /dev/null
+++ b/src/ansiblelint/rules/no_tabs.py
@@ -0,0 +1,67 @@
+"""Implementation of no-tabs rule."""
+# Copyright (c) 2016, Will Thames and contributors
+# Copyright (c) 2018, Ansible Project
+from __future__ import annotations
+
+import sys
+from typing import TYPE_CHECKING
+
+from ansiblelint.rules import AnsibleLintRule
+from ansiblelint.yaml_utils import nested_items_path
+
+if TYPE_CHECKING:
+    from ansiblelint.file_utils import Lintable
+    from ansiblelint.utils import Task
+
+
+class NoTabsRule(AnsibleLintRule):
+    """Most files should not contain tabs."""
+
+    id = "no-tabs"
+    description = "Tabs can cause unexpected display issues, use spaces"
+    severity = "LOW"
+    tags = ["formatting"]
+    version_added = "v4.0.0"
+    allow_list = [
+        ("lineinfile", "insertafter"),
+        ("lineinfile", "insertbefore"),
+        ("lineinfile", "regexp"),
+        ("lineinfile", "line"),
+        ("ansible.builtin.lineinfile", "insertafter"),
+        ("ansible.builtin.lineinfile", "insertbefore"),
+        ("ansible.builtin.lineinfile", "regexp"),
+        ("ansible.builtin.lineinfile", "line"),
+        ("ansible.legacy.lineinfile", "insertafter"),
+        ("ansible.legacy.lineinfile", "insertbefore"),
+        ("ansible.legacy.lineinfile", "regexp"),
+        ("ansible.legacy.lineinfile", "line"),
+    ]
+
+    def matchtask(
+        self,
+        task: Task,
+        file: Lintable | None = None,
+    ) -> bool | str:
+        action = task["action"]["__ansible_module__"]
+        for k, v, _ in nested_items_path(task):
+            if isinstance(k, str) and "\t" in k:
+                return True
+            if isinstance(v, str) and "\t" in v and (action, k) not in self.allow_list:
+                return True
+        return False
+
+
+# testing code to be loaded only with pytest or when executed the rule file
+if "pytest" in sys.modules:
+    from ansiblelint.rules import RulesCollection  # pylint: disable=ungrouped-imports
+    from ansiblelint.runner import Runner  # pylint: disable=ungrouped-imports
+
+    def test_no_tabs_rule(default_rules_collection: RulesCollection) -> None:
+        """Test rule matches."""
+        results = Runner(
+            "examples/playbooks/rule-no-tabs.yml",
+            rules=default_rules_collection,
+        ).run()
+        assert results[0].lineno == 10
+        assert results[0].message == NoTabsRule().shortdesc
+        assert len(results) == 2