Add name[casing] to identify wrongly capitalized task names

Fixes: #2169

.github/workflows/tox.yml

@@ -164,7 +164,7 @@ jobs:
       WSLENV: FORCE_COLOR:PYTEST_REQPASS:TOXENV:TOX_PARALLEL_NO_SPINNER
       # Number of expected test passes, safety measure for accidental skip of
       # tests. Update value if you add/remove tests.
-      PYTEST_REQPASS: 658
+      PYTEST_REQPASS: 659
 
     steps:
       - name: Activate WSL1

examples/playbooks/task-name-lowercase.yml

@@ -0,0 +1,6 @@
+---
+- hosts: all
+  tasks:
+    - name: this task has a name is not correctly capitalized
+      ansible.builtin.command: echo "Hello World"
+      changed_when: false

src/ansiblelint/rules/name.md

@@ -0,0 +1,24 @@
+## name
+
+This rule identifies several problems related to task naming. This is important
+because these names are the primary way to identify executed tasks on console,
+logs or web interface. Their role is also to document what a task is supposed
+to do.
+
+- `name[missing]` - All tasks are required to have a name
+- `name[casing]` - All task names should start with a capital letter
+
+### Problematic code
+
+```yaml
+---
+- ansible.builtin.command: touch /tmp/.placeholder
+```
+
+### Correct code
+
+```yaml
+---
+- name: Create placeholder file
+  ansible.builtin.command: touch /tmp/.placeholder
+```

src/ansiblelint/rules/name.py

@@ -12,7 +12,7 @@
 
 
 class NameRule(AnsibleLintRule):
-    """All tasks should be named."""
+    """Rule for checking task names and their content."""
 
     id = "name"
     description = (
@@ -26,9 +26,20 @@ class NameRule(AnsibleLintRule):
     def matchtask(
         self, task: Dict[str, Any], file: "Optional[Lintable]" = None
     ) -> Union[bool, str, MatchError]:
-        if not task.get("name"):
+        name = task.get("name")
+        if not name:
             return self.create_matcherror(
-                linenumber=task["__line__"], tag="name[missing]", filename=file
+                message="All tasks should be named.",
+                linenumber=task["__line__"],
+                tag="name[missing]",
+                filename=file,
+            )
+        if not name[0].isupper():
+            return self.create_matcherror(
+                message="All names should start with an uppercase letter.",
+                linenumber=task["__line__"],
+                tag="name[casing]",
+                filename=file,
             )
         return False
 
@@ -54,3 +65,14 @@ def test_file_negative() -> None:
         bad_runner = Runner(failure, rules=collection)
         errs = bad_runner.run()
         assert len(errs) == 4
+
+    def test_rule_name_lowercase() -> None:
+        """Negative test for a task that starts with lowercase."""
+        collection = RulesCollection()
+        collection.register(NameRule())
+        failure = "examples/playbooks/task-name-lowercase.yml"
+        bad_runner = Runner(failure, rules=collection)
+        errs = bad_runner.run()
+        assert len(errs) == 1
+        assert errs[0].tag == "name[casing]"
+        assert errs[0].rule.id == "name"