[v2] Document parameter constraints

awscli/botocore/model.py

@@ -89,6 +89,7 @@ class Shape:
         'contextParam',
         'clientContextParams',
         'requiresLength',
+        'pattern',
     ]
     MAP_TYPE = OrderedDict
 

awscli/clidocs.py

@@ -210,6 +210,7 @@ def doc_option(self, arg_name, help_command, **kwargs):
             self._add_tagged_union_note(argument.argument_model, doc)
         if hasattr(argument, 'argument_model'):
             self._document_enums(argument.argument_model, doc)
+            self._document_constraints(argument.argument_model, doc)
             self._document_nested_structure(argument.argument_model, doc)
         doc.style.dedent()
         doc.style.new_paragraph()
@@ -289,6 +290,8 @@ def _do_doc_member(self, doc, member_name, member_shape, stack):
         doc.include_doc_string(docs)
         if is_tagged_union_type(member_shape):
             self._add_tagged_union_note(member_shape, doc)
+        self._document_enums(member_shape, doc)
+        self._document_constraints(member_shape, doc)
         doc.style.new_paragraph()
         member_type_name = member_shape.type_name
         if member_type_name == 'structure':
@@ -327,6 +330,23 @@ def _add_tagged_union_note(self, shape, doc):
         doc.writeln(msg)
         doc.style.end_note()
 
+    def _document_constraints(self, model, doc):
+        """Documents parameter value constraints"""
+        if not hasattr(model, 'metadata'):
+            return
+        constraints = ['min', 'max', 'pattern']
+        if not any(
+            [constraint in model.metadata for constraint in constraints]
+        ):
+            return
+        doc.style.new_paragraph()
+        doc.write('Constraints:')
+        doc.style.start_ul()
+        for constraint in constraints:
+            if (val := model.metadata.get(constraint)) is not None:
+                doc.style.li(f'{constraint}: ``{val}``')
+        doc.style.end_ul()
+
 
 class ProviderDocumentEventHandler(CLIDocumentEventHandler):
     def doc_breadcrumbs(self, help_command, event_name, **kwargs):
@@ -609,10 +629,6 @@ def doc_option_example(self, arg_name, help_command, event_name, **kwargs):
                 member, include_enum_values=False
             )
             doc.write('%s %s ...' % (example_type, example_type))
-            if isinstance(member, StringShape) and member.enum:
-                # If we have enum values, we can tell the user
-                # exactly what valid values they can provide.
-                self._write_valid_enums(doc, member.enum)
             doc.style.end_codeblock()
             doc.style.new_paragraph()
         elif cli_argument.cli_type_name not in SCALAR_TYPES:
@@ -623,13 +639,6 @@ def doc_option_example(self, arg_name, help_command, event_name, **kwargs):
             doc.style.end_codeblock()
             doc.style.new_paragraph()
 
-    def _write_valid_enums(self, doc, enum_values):
-        doc.style.new_paragraph()
-        doc.write("Where valid values are:\n")
-        for value in enum_values:
-            doc.write("    %s\n" % value)
-        doc.write("\n")
-
     def doc_output(self, help_command, event_name, **kwargs):
         doc = help_command.doc
         doc.style.h2('Output')

tests/functional/docs/test_help_output.py

@@ -367,35 +367,6 @@ def test_description_from_rst_file(self):
         self.assert_contains('aws_access_key_id')
 
 
-class TestEnumDocsArentDuplicated(BaseAWSHelpOutputTest):
-    def test_enum_docs_arent_duplicated(self):
-        # Test for: https://github.com/aws/aws-cli/issues/609
-        # What's happening is if you have a list param that has
-        # an enum, we document it as:
-        # a|b|c|d   a|b|c|d
-        # Except we show all of the possible enum params twice.
-        # Each enum param should only occur once.  The ideal documentation
-        # should be:
-        #
-        # string1 string2
-        #
-        # Where each value is one of:
-        #     value1
-        #     value2
-        self.driver.main(['cloudformation', 'list-stacks', 'help'])
-        # "CREATE_IN_PROGRESS" is a enum value, and should only
-        # appear once in the help output.
-        contents = self.renderer.rendered_contents
-        self.assertTrue(
-            contents.count("CREATE_IN_PROGRESS") == 1,
-            (
-                "Enum param was only suppose to be appear once in "
-                "rendered doc output, appeared: %s"
-                % contents.count("CREATE_IN_PROGRESS")
-            ),
-        )
-
-
 class TestParametersCanBeHidden(BaseAWSHelpOutputTest):
     def mark_as_undocumented(self, argument_table, **kwargs):
         argument_table['starting-sequence-number']._UNDOCUMENTED = True

tests/unit/test_clidocs.py

@@ -499,6 +499,22 @@ def test_tagged_union_comes_after_docstring_output(self):
         rendered = help_command.doc.getvalue().decode('utf-8')
         self.assertRegex(rendered, r'FooBar[\s\S]*Tagged Union')
 
+    def test_documents_constraints(self):
+        shape = {'type': 'string', 'min': 0, 'max': 10, 'pattern': '.*'}
+        shape = StringShape('ConstrainedArg', shape)
+        arg = CustomArgument('ConstrainedArg', argument_model=shape)
+        help_command = self.create_help_command()
+        help_command.arg_table = {'ConstrainedArg': arg}
+        operation_handler = OperationDocumentEventHandler(help_command)
+        operation_handler.doc_option(
+            arg_name='ConstrainedArg', help_command=help_command
+        )
+        rendered = help_command.doc.getvalue().decode('utf-8')
+        self.assertIn('Constraints', rendered)
+        self.assertIn('min: ``0``', rendered)
+        self.assertIn('max: ``10``', rendered)
+        self.assertIn('pattern: ``.*``', rendered)
+
 
 class TestTopicDocumentEventHandlerBase(unittest.TestCase):
     def setUp(self):