feat: Nested settings are now documented in the output of --about --format=markdown

singer_sdk/about.py

@@ -164,6 +164,60 @@ def format_about(self, about_info: AboutInfo) -> str:
 class MarkdownFormatter(AboutFormatter, format_name="markdown"):
     """About formatter for Markdown output."""
 
+    def _generate_property_row(
+        self,
+        name: str,
+        schema: dict[str, t.Any],
+        *,
+        required: bool,
+        parent_name: str | None = None,
+    ) -> t.Generator[str, None, None]:
+        """Generate a row for this property and for nested properties, if any.
+
+        Args:
+            name: The property name.
+            schema: The property schema.
+            required: Whether the property is required to be present.
+            parent_name: The parent property name, if any.
+
+        Yields:
+            One markdown table row for the setting, and one for each sub-property.
+        """
+        setting_name = f"{parent_name}.{name}" if parent_name else name
+        md_description = schema.get("description", "").replace("\n", "<BR/>")
+        yield (
+            f"| {setting_name} "
+            f"| {'True' if required else 'False':8} "
+            f"| {schema.get('default', 'None'):7} "
+            f"| {md_description:11} |"
+        )
+        if "properties" in schema:
+            yield from self._generate_property_rows(schema, parent_name=setting_name)
+
+    def _generate_property_rows(
+        self,
+        schema: dict[str, t.Any],
+        *,
+        parent_name: str = "",
+    ) -> t.Generator[str, None, None]:
+        """Generate a row for each property in the schema.
+
+        Args:
+            schema: A JSON object schema.
+            parent_name: The parent property name, if any.
+
+        Yields:
+            One markdown table row for each property.
+        """
+        required_settings = schema.get("required", [])
+        for name, sub_schema in schema.get("properties", {}).items():
+            yield from self._generate_property_row(
+                name,
+                sub_schema,
+                required=name in required_settings,
+                parent_name=parent_name,
+            )
+
     def format_about(self, about_info: AboutInfo) -> str:
         """Render about information.
 
@@ -173,18 +227,8 @@ def format_about(self, about_info: AboutInfo) -> str:
         Returns:
             A formatted string.
         """
-        max_setting_len = max(len(k) for k in about_info.settings["properties"])
-
-        # Set table base for markdown
-        table_base = (
-            f"| {'Setting':{max_setting_len}}| Required | Default | Description |\n"
-            f"|:{'-' * max_setting_len}|:--------:|:-------:|:------------|\n"
-        )
-
         # Empty list for string parts
         md_list = []
-        # Get required settings for table
-        required_settings = about_info.settings.get("required", [])
 
         # Iterate over Dict to set md
         md_list.append(
@@ -201,19 +245,14 @@ def format_about(self, about_info: AboutInfo) -> str:
         md_list.append(capabilities)
 
         setting = "## Settings\n\n"
-
-        for k, v in about_info.settings.get("properties", {}).items():
-            md_description = v.get("description", "").replace("\n", "<BR/>")
-            table_base += (
-                f"| {k}{' ' * (max_setting_len - len(k))}"
-                f"| {'True' if k in required_settings else 'False':8} | "
-                f"{v.get('default', 'None'):7} | "
-                f"{md_description:11} |\n"
-            )
-
-        setting += table_base
+        settings_table = (
+            "| Setting | Required | Default | Description |\n"
+            "|:--------|:--------:|:-------:|:------------|\n"
+        )
+        settings_table += "\n".join(self._generate_property_rows(about_info.settings))
+        setting += settings_table
         setting += (
-            "\n"
+            "\n\n"
             + "\n".join(
                 [
                     "A full list of supported settings and capabilities "

tests/core/test_about.py

@@ -53,6 +53,16 @@ def about_info() -> AboutInfo:
                     "type": "string",
                     "description": "API key for the tap to use.",
                 },
+                "complex_setting": {
+                    "type": "object",
+                    "description": "A complex setting, with sub-settings.",
+                    "properties": {
+                        "sub_setting": {
+                            "type": "string",
+                            "description": "A sub-setting.",
+                        }
+                    },
+                },
             },
             "required": ["api_key"],
         },

tests/snapshots/about_format/json.snap.json

@@ -23,6 +23,16 @@
       "api_key": {
         "type": "string",
         "description": "API key for the tap to use."
+      },
+      "complex_setting": {
+        "type": "object",
+        "description": "A complex setting, with sub-settings.",
+        "properties": {
+          "sub_setting": {
+            "type": "string",
+            "description": "A sub-setting."
+          }
+        }
       }
     },
     "required": [

tests/snapshots/about_format/markdown.snap.md

@@ -12,10 +12,12 @@ Built with the [Meltano Singer SDK](https://sdk.meltano.com).
 
 ## Settings
 
-| Setting   | Required | Default | Description |
-|:----------|:--------:|:-------:|:------------|
-| start_date| False    | None    | Start date for the tap to extract data from. |
-| api_key   | True     | None    | API key for the tap to use. |
+| Setting | Required | Default | Description |
+|:--------|:--------:|:-------:|:------------|
+| start_date | False    | None    | Start date for the tap to extract data from. |
+| api_key | True     | None    | API key for the tap to use. |
+| complex_setting | False    | None    | A complex setting, with sub-settings. |
+| complex_setting.sub_setting | False    | None    | A sub-setting. |
 
 A full list of supported settings and capabilities is available by running: `tap-example --about`
 

tests/snapshots/about_format/text.snap.txt

@@ -4,4 +4,4 @@ Version: 0.1.1
 SDK Version: 1.0.0
 Supported Python Versions: ['3.6', '3.7', '3.8']
 Capabilities: [catalog, discover, state]
-Settings: {'properties': {'start_date': {'type': 'string', 'format': 'date-time', 'description': 'Start date for the tap to extract data from.'}, 'api_key': {'type': 'string', 'description': 'API key for the tap to use.'}}, 'required': ['api_key']}
+Settings: {'properties': {'start_date': {'type': 'string', 'format': 'date-time', 'description': 'Start date for the tap to extract data from.'}, 'api_key': {'type': 'string', 'description': 'API key for the tap to use.'}, 'complex_setting': {'type': 'object', 'description': 'A complex setting, with sub-settings.', 'properties': {'sub_setting': {'type': 'string', 'description': 'A sub-setting.'}}}}, 'required': ['api_key']}