Changed rules to use docstring as shortdesc

Simplifies rule by ensuring that we do use the docstring as their
short description. This also enables us to address most pylint
no-class-docstring excludes.

docs/custom-rules.rst

@@ -32,9 +32,9 @@ An example rule using ``match`` is:
     from ansiblelint.rules import AnsibleLintRule
 
     class DeprecatedVariableRule(AnsibleLintRule):
+        """Deprecated variable declarations."""
 
         id = 'EXAMPLE002'
-        shortdesc = 'Deprecated variable declarations'
         description = 'Check for lines that have old style ${var} ' + \
                       'declarations'
         tags = { 'deprecations' }
@@ -57,8 +57,9 @@ An example rule using ``matchtask`` is:
         from ansiblelint.file_utils import Lintable
 
     class TaskHasTag(AnsibleLintRule):
+        """Tasks must have tag."""
+
         id = 'EXAMPLE001'
-        shortdesc = 'Tasks must have tag'
         description = 'Tasks must have tag'
         tags = ['productivity']
 

examples/rules/task_has_tag.py

@@ -13,7 +13,6 @@ class TaskHasTag(AnsibleLintRule):
     """Tasks must have tag."""
 
     id = "EXAMPLE001"
-    shortdesc = "Tasks must have tag"
     description = "Tasks must have tag"
     tags = ["productivity", "tags"]
 

src/ansiblelint/_internal/rules.py

@@ -18,14 +18,18 @@ class BaseRule:
 
     id: str = ""
     tags: List[str] = []
-    shortdesc: str = ""
     description: str = ""
     version_added: str = ""
     severity: str = ""
     link: str = ""
     has_dynamic_tags: bool = False
     needs_raw_task: bool = False
 
+    @property
+    def shortdesc(self) -> str:
+        """Return the short description of the rule, basically the docstring."""
+        return self.__doc__ or ""
+
     def getmatches(self, file: "Lintable") -> List["MatchError"]:
         """Return all matches while ignoring exceptions."""
         matches = []
@@ -94,10 +98,9 @@ def __lt__(self, other: "BaseRule") -> bool:
 
 
 class RuntimeErrorRule(BaseRule):
-    """Used to identify errors."""
+    """Unexpected internal error."""
 
     id = "internal-error"
-    shortdesc = "Unexpected internal error"
     description = (
         "This error can be caused by internal bugs but also by "
         "custom rules. Instead of just stopping linter we generate the errors and "
@@ -110,21 +113,19 @@ class RuntimeErrorRule(BaseRule):
 
 
 class AnsibleParserErrorRule(BaseRule):
-    """Used to mark errors received from Ansible."""
+    """AnsibleParserError."""
 
     id = "parser-error"
-    shortdesc = "AnsibleParserError"
     description = "Ansible parser fails; this usually indicates an invalid file."
     severity = "VERY_HIGH"
     tags = ["core"]
     version_added = "v5.0.0"
 
 
 class LoadingFailureRule(BaseRule):
-    """File loading failure."""
+    """Failed to load or parse file."""
 
     id = "load-failure"
-    shortdesc = "Failed to load or parse file"
     description = "Linter failed to process a YAML file, possible not an Ansible file."
     severity = "VERY_HIGH"
     tags = ["core"]

src/ansiblelint/rules/command_instead_of_module.py

@@ -32,8 +32,9 @@
 
 
 class CommandsInsteadOfModulesRule(AnsibleLintRule):
+    """Using command rather than module."""
+
     id = "command-instead-of-module"
-    shortdesc = "Using command rather than module"
     description = (
         "Executing a command when there is an Ansible module is generally a bad idea"
     )

src/ansiblelint/rules/command_instead_of_shell.py

@@ -97,8 +97,9 @@
 
 
 class UseCommandInsteadOfShellRule(AnsibleLintRule):
+    """Use shell only when shell functionality is required."""
+
     id = "command-instead-of-shell"
-    shortdesc = "Use shell only when shell functionality is required"
     description = (
         "Shell should only be used when piping, redirecting "
         "or chaining commands (and Ansible would be preferred "

src/ansiblelint/rules/deprecated_bare_vars.py

@@ -31,8 +31,9 @@
 
 
 class UsingBareVariablesIsDeprecatedRule(AnsibleLintRule):
+    """Using bare variables is deprecated."""
+
     id = "deprecated-bare-vars"
-    shortdesc = "Using bare variables is deprecated"
     description = (
         "Using bare variables is deprecated. Update your "
         "playbooks so that the environment value uses the full variable "

src/ansiblelint/rules/deprecated_command_syntax.py

@@ -31,8 +31,9 @@
 
 
 class CommandsInsteadOfArgumentsRule(AnsibleLintRule):
+    """Using command rather than an argument to e.g. file."""
+
     id = "deprecated-command-syntax"
-    shortdesc = "Using command rather than an argument to e.g. file"
     description = (
         "Executing a command when there are arguments to modules "
         "is generally a bad idea"

src/ansiblelint/rules/deprecated_local_action.py

@@ -4,8 +4,9 @@
 
 
 class TaskNoLocalAction(AnsibleLintRule):
+    """Do not use 'local_action', use 'delegate_to: localhost'."""
+
     id = "deprecated-local-action"
-    shortdesc = "Do not use 'local_action', use 'delegate_to: localhost'"
     description = "Do not use ``local_action``, use ``delegate_to: localhost``"
     severity = "MEDIUM"
     tags = ["deprecations"]

src/ansiblelint/rules/deprecated_module.py

@@ -11,8 +11,9 @@
 
 
 class DeprecatedModuleRule(AnsibleLintRule):
+    """Deprecated module."""
+
     id = "deprecated-module"
-    shortdesc = "Deprecated module"
     description = (
         "These are deprecated modules, some modules are kept "
         "temporarily for backwards compatibility but usage is discouraged. "

src/ansiblelint/rules/empty_string_compare.py

@@ -15,8 +15,9 @@
 
 
 class ComparisonToEmptyStringRule(AnsibleLintRule):
+    """Don't compare to empty string."""
+
     id = "empty-string-compare"
-    shortdesc = "Don't compare to empty string"
     description = (
         'Use ``when: var|length > 0`` rather than ``when: var != ""`` (or '
         'conversely ``when: var|length == 0`` rather than ``when: var == ""``)'
@@ -83,7 +84,7 @@ def test_rule_empty_string_compare_fail(rule_runner: RunFromText) -> None:
         results = rule_runner.run_playbook(FAIL_PLAY)
         assert len(results) == 2
         for result in results:
-            assert result.message == ComparisonToEmptyStringRule.shortdesc
+            assert result.message == ComparisonToEmptyStringRule().shortdesc
 
     @pytest.mark.parametrize(
         "rule_runner", (ComparisonToEmptyStringRule,), indirect=["rule_runner"]

src/ansiblelint/rules/fqcn_builtins.py

@@ -80,9 +80,10 @@
 
 
 class FQCNBuiltinsRule(AnsibleLintRule):
+    """Use FQCN for builtin actions."""
+
     id = "fqcn-builtins"
     severity = "MEDIUM"
-    shortdesc = "Use FQCN for builtin actions"
     description = (
         "Check whether the long version starting with ``ansible.builtin`` "
         "is used in the playbook"
@@ -124,7 +125,7 @@ def test_fqcn_builtin_fail(rule_runner: RunFromText) -> None:
         results = rule_runner.run_playbook(FAIL_PLAY)
         assert len(results) == 1
         for result in results:
-            assert result.message == FQCNBuiltinsRule.shortdesc
+            assert result.message == FQCNBuiltinsRule().shortdesc
 
     @pytest.mark.parametrize(
         "rule_runner", (FQCNBuiltinsRule,), indirect=["rule_runner"]

src/ansiblelint/rules/git_latest.py

@@ -29,8 +29,9 @@
 
 
 class GitHasVersionRule(AnsibleLintRule):
+    """Git checkouts must contain explicit version."""
+
     id = "git-latest"
-    shortdesc = "Git checkouts must contain explicit version"
     description = (
         "All version control checkouts must point to "
         "an explicit commit or tag, not just ``latest``"

src/ansiblelint/rules/hg_latest.py

@@ -29,8 +29,9 @@
 
 
 class MercurialHasRevisionRule(AnsibleLintRule):
+    """Mercurial checkouts must contain explicit revision."""
+
     id = "hg-latest"
-    shortdesc = "Mercurial checkouts must contain explicit revision"
     description = (
         "All version control checkouts must point to "
         "an explicit commit or tag, not just ``latest``"

src/ansiblelint/rules/ignore_errors.py

@@ -11,12 +11,9 @@
 
 
 class IgnoreErrorsRule(AnsibleLintRule):
-    """Describe and test the IgnoreErrorsRule."""
+    """Use failed_when and specify error conditions instead of using ignore_errors."""
 
     id = "ignore-errors"
-    shortdesc = (
-        "Use failed_when and specify error conditions instead of using ignore_errors"
-    )
     description = (
         "Instead of ignoring all errors, ignore the errors only when using ``{{ ansible_check_mode }}``, "
         "register the errors using ``register``, "

src/ansiblelint/rules/inline_env_var.py

@@ -30,8 +30,9 @@
 
 
 class EnvVarsInCommandRule(AnsibleLintRule):
+    """Command module does not accept setting environment variables inline."""
+
     id = "inline-env-var"
-    shortdesc = "Command module does not accept setting environment variables inline"
     description = (
         "Use ``environment:`` to set environment variables "
         "or use ``shell`` module which accepts both"

src/ansiblelint/rules/literal_compare.py

@@ -14,8 +14,9 @@
 
 
 class ComparisonToLiteralBoolRule(AnsibleLintRule):
+    """Don't compare to literal True/False."""
+
     id = "literal-compare"
-    shortdesc = "Don't compare to literal True/False"
     description = (
         "Use ``when: var`` rather than ``when: var == True`` "
         "(or conversely ``when: not var``)"

src/ansiblelint/rules/meta_incorrect.py

@@ -14,8 +14,9 @@
 
 
 class MetaChangeFromDefaultRule(AnsibleLintRule):
+    """meta/main.yml default values should be changed."""
+
     id = "meta-incorrect"
-    shortdesc = "meta/main.yml default values should be changed"
     field_defaults = [
         ("author", "your name"),
         ("description", "your description"),

src/ansiblelint/rules/meta_no_info.py

@@ -55,8 +55,9 @@ def _galaxy_info_errors_itr(
 
 
 class MetaMainHasInfoRule(AnsibleLintRule):
+    """meta/main.yml should contain relevant info."""
+
     id = "meta-no-info"
-    shortdesc = "meta/main.yml should contain relevant info"
     str_info = META_STR_INFO
     info = META_INFO
     description = "meta/main.yml should contain: ``{}``".format(", ".join(info))

src/ansiblelint/rules/meta_no_tags.py

@@ -15,8 +15,9 @@
 
 
 class MetaTagValidRule(AnsibleLintRule):
+    """Tags must contain lowercase letters and digits only."""
+
     id = "meta-no-tags"
-    shortdesc = "Tags must contain lowercase letters and digits only"
     description = (
         "Tags must contain lowercase letters and digits only, "
         "and ``galaxy_tags`` is expected to be a list"

src/ansiblelint/rules/meta_video_links.py

@@ -15,8 +15,9 @@
 
 
 class MetaVideoLinksRule(AnsibleLintRule):
+    """meta/main.yml video_links should be formatted correctly."""
+
     id = "meta-video-links"
-    shortdesc = "meta/main.yml video_links should be formatted correctly"
     description = (
         "Items in ``video_links`` in meta/main.yml should be "
         "dictionaries, and contain only keys ``url`` and ``title``, "

src/ansiblelint/rules/no_changed_when.py

@@ -30,8 +30,9 @@
 
 
 class CommandHasChangesCheckRule(AnsibleLintRule):
+    """Commands should not change things if nothing needs doing."""
+
     id = "no-changed-when"
-    shortdesc = "Commands should not change things if nothing needs doing"
     description = """
 Tasks should tell Ansible when to return ``changed``, unless the task only reads
 information. To do this, set ``changed_when``, use the ``creates`` or

src/ansiblelint/rules/no_handler.py

@@ -48,8 +48,9 @@ def _changed_in_when(item: str) -> bool:
 
 
 class UseHandlerRatherThanWhenChangedRule(AnsibleLintRule):
+    """Tasks that run when changed should likely be handlers."""
+
     id = "no-handler"
-    shortdesc = "Tasks that run when changed should likely be handlers"
     description = (
         "If a task has a ``when: result.changed`` setting, it is effectively "
         "acting as a handler. You could use notify and move that task to "

src/ansiblelint/rules/no_jinja_nesting.py

@@ -33,8 +33,9 @@
 
 
 class NestedJinjaRule(AnsibleLintRule):
+    """Nested jinja pattern."""
+
     id = "no-jinja-nesting"
-    shortdesc = "Nested jinja pattern"
     description = (
         "There should not be any nested jinja pattern. "
         "Example (bad): ``{{ list_one + {{ list_two | max }} }}``, "

src/ansiblelint/rules/no_jinja_when.py

@@ -12,8 +12,9 @@
 
 
 class NoFormattingInWhenRule(AnsibleLintRule):
+    """No Jinja2 in when."""
+
     id = "no-jinja-when"
-    shortdesc = "No Jinja2 in when"
     description = (
         "``when`` is a raw Jinja2 expression, remove redundant {{ }} from variable(s)."
     )

src/ansiblelint/rules/no_log_password.py

@@ -26,10 +26,9 @@
 
 
 class NoLogPasswordsRule(AnsibleLintRule):
-    """Describe and test the NoLogPasswordsRule."""
+    """Password should not be logged."."""
 
     id = "no-log-password"
-    shortdesc = "password should not be logged."
     description = (
         "When passing password argument you should have no_log configured "
         "to a non False value to avoid accidental leaking of secrets."

src/ansiblelint/rules/no_loop_var_prefix.py

@@ -18,7 +18,6 @@ class RoleLoopVarPrefix(AnsibleLintRule):
     """Role loop_var should use configured prefix."""
 
     id = "no-loop-var-prefix"
-    shortdesc = __doc__
     link = (
         "https://docs.ansible.com/ansible/latest/user_guide/"
         "playbooks_loops.html#defining-inner-and-outer-variable-names-with-loop-var"
@@ -38,7 +37,6 @@ def matchplay(self, file: Lintable, data: "odict[str, Any]") -> List[MatchError]
         if not options.loop_var_prefix:
             return results
         self.prefix = options.loop_var_prefix.format(role=toidentifier(file.role))
-        self.shortdesc = f"{self.__class__.shortdesc}: {self.prefix}"
 
         if file.kind not in ("tasks", "handlers"):
             return results

src/ansiblelint/rules/no_relative_paths.py

@@ -12,8 +12,9 @@
 
 
 class RoleRelativePath(AnsibleLintRule):
+    """Doesn't need a relative path in role."""
+
     id = "no-relative-paths"
-    shortdesc = "Doesn't need a relative path in role"
     description = (
         "``copy`` and ``template`` do not need to use relative path for ``src``"
     )

src/ansiblelint/rules/no_same_owner.py

@@ -10,9 +10,9 @@
 
 
 class NoSameOwnerRule(AnsibleLintRule):
+    """Owner should not be kept between different hosts."""
 
     id = "no-same-owner"
-    shortdesc = "Owner should not be kept between different hosts"
     description = """
 Optional rule that highlights dangers of assuming that user/group on the remote
 machines may not exist on ansible controller or vice versa. Owner and group
@@ -133,4 +133,4 @@ def test_no_same_owner_rule(
         results = Runner(test_file, rules=default_rules_collection).run()
         assert len(results) == failures
         for result in results:
-            assert result.message == NoSameOwnerRule.shortdesc
+            assert result.message == NoSameOwnerRule().shortdesc