Add feature: no-metadata-doc which removes doc from metadata and full-metadata which build metadata with all doc

.gitlab-ci.yml

@@ -451,7 +451,7 @@ test-linux-stable:                 &test-linux
   script:
     # this job runs all tests in former runtime-benchmarks, frame-staking and wasmtime tests
     - time cargo test --workspace --locked --release --verbose --features runtime-benchmarks --manifest-path bin/node/cli/Cargo.toml
-    - time cargo test -p frame-support-test --features=conditional-storage --manifest-path frame/support/test/Cargo.toml --test pallet # does not reuse cache 1 min 44 sec
+    - time cargo test -p frame-support-test --features=conditional-storage,no-metadata-docs --manifest-path frame/support/test/Cargo.toml --test pallet # does not reuse cache 1 min 44 sec
     - SUBSTRATE_TEST_TIMEOUT=1 time cargo test -p substrate-test-utils --release --verbose --locked -- --ignored timeout
     - sccache -s
 

frame/support/Cargo.toml

@@ -63,3 +63,9 @@ std = [
 ]
 runtime-benchmarks = []
 try-runtime = []
+# By default some types have documentation, `no-metadata-docs` allows to reduce the documentation
+# in the metadata.
+no-metadata-docs = ["frame-support-procedural/no-metadata-docs"]
+# By default some types have documentation, `full-metadata-docs` allows to add documentation to
+# more types in the metadata.
+full-metadata-docs = ["scale-info/docs"]

frame/support/procedural/Cargo.toml

@@ -24,3 +24,4 @@ syn = { version = "1.0.81", features = ["full"] }
 [features]
 default = ["std"]
 std = []
+no-metadata-docs = []

frame/support/procedural/src/pallet/expand/call.rs

@@ -137,6 +137,8 @@ pub fn expand_call(def: &mut Def) -> proc_macro2::TokenStream {
 	let count = COUNTER.with(|counter| counter.borrow_mut().inc());
 	let macro_ident = syn::Ident::new(&format!("__is_call_part_defined_{}", count), span);
 
+	let capture_docs = if cfg!(feature = "no-metadata-docs") { "never" } else { "always" };
+
 	quote::quote_spanned!(span =>
 		#[doc(hidden)]
 		pub mod __substrate_call_check {
@@ -164,7 +166,7 @@ pub fn expand_call(def: &mut Def) -> proc_macro2::TokenStream {
 		)]
 		#[codec(encode_bound())]
 		#[codec(decode_bound())]
-		#[scale_info(skip_type_params(#type_use_gen), capture_docs = "always")]
+		#[scale_info(skip_type_params(#type_use_gen), capture_docs = #capture_docs)]
 		#[allow(non_camel_case_types)]
 		pub enum #call_ident<#type_decl_bounded_gen> #where_clause {
 			#[doc(hidden)]

frame/support/procedural/src/pallet/expand/constants.rs

@@ -79,7 +79,9 @@ pub fn expand_constants(def: &mut Def) -> proc_macro2::TokenStream {
 		let const_type = &const_.type_;
 		let ident_str = format!("{}", const_.metadata_name.unwrap_or(const_.ident));
 
-		let doc = const_.doc.clone().into_iter();
+		let no_docs = vec![];
+		let doc = if cfg!(feature = "no-metadata-docs") { &no_docs } else { &const_.doc };
+
 		let default_byte_impl = &const_.default_byte_impl;
 
 		quote::quote!({

frame/support/procedural/src/pallet/expand/error.rs

@@ -58,12 +58,15 @@ pub fn expand_error(def: &mut Def) -> proc_macro2::TokenStream {
 	};
 
 	error_item.variants.insert(0, phantom_variant);
+
+	let capture_docs = if cfg!(feature = "no-metadata-docs") { "never" } else { "always" };
+
 	// derive TypeInfo for error metadata
 	error_item
 		.attrs
 		.push(syn::parse_quote!( #[derive(#frame_support::scale_info::TypeInfo)] ));
 	error_item.attrs.push(syn::parse_quote!(
-		#[scale_info(skip_type_params(#type_use_gen), capture_docs = "always")]
+		#[scale_info(skip_type_params(#type_use_gen), capture_docs = #capture_docs)]
 	));
 
 	if get_doc_literals(&error_item.attrs).is_empty() {

frame/support/procedural/src/pallet/expand/event.rs

@@ -117,9 +117,11 @@ pub fn expand_event(def: &mut Def) -> proc_macro2::TokenStream {
 		)]
 	));
 
-	// skip requirement for type params to implement `TypeInfo`, and require docs capture
+	let capture_docs = if cfg!(feature = "no-metadata-docs") { "never" } else { "always" };
+
+	// skip requirement for type params to implement `TypeInfo`, and set docs capture
 	event_item.attrs.push(syn::parse_quote!(
-		#[scale_info(skip_type_params(#event_use_gen), capture_docs = "always")]
+		#[scale_info(skip_type_params(#event_use_gen), capture_docs = #capture_docs)]
 	));
 
 	let deposit_event = if let Some(deposit_event) = &event.deposit_event {

frame/support/procedural/src/pallet/expand/storage.rs

@@ -234,7 +234,8 @@ pub fn expand_storages(def: &mut Def) -> proc_macro2::TokenStream {
 	let pallet_ident = &def.pallet_struct.pallet;
 
 	let entries_builder = def.storages.iter().map(|storage| {
-		let docs = &storage.docs;
+		let no_docs = vec![];
+		let docs = if cfg!(feature = "no-metadata-docs") { &no_docs } else { &storage.docs };
 
 		let ident = &storage.ident;
 		let gen = &def.type_use_generics(storage.attr_span);

frame/support/src/storage/types/counted_map.rs

@@ -428,7 +428,11 @@ where
 	fn build_metadata(docs: Vec<&'static str>, entries: &mut Vec<StorageEntryMetadata>) {
 		<Self as MapWrapper>::Map::build_metadata(docs, entries);
 		CounterFor::<Prefix>::build_metadata(
-			vec![&"Counter for the related counted storage map"],
+			if cfg!(feature = "no-metadata-docs") {
+				vec![]
+			} else {
+				vec![&"Counter for the related counted storage map"]
+			},
 			entries,
 		);
 	}
@@ -1046,7 +1050,11 @@ mod test {
 					modifier: StorageEntryModifier::Default,
 					ty: StorageEntryType::Plain(scale_info::meta_type::<u32>()),
 					default: vec![0, 0, 0, 0],
-					docs: vec!["Counter for the related counted storage map"],
+					docs: if cfg!(feature = "no-metadata-docs") {
+						vec![]
+					} else {
+						vec!["Counter for the related counted storage map"]
+					},
 				},
 			]
 		);

frame/support/src/storage/types/double_map.rs

@@ -530,6 +530,8 @@ where
 	MaxValues: Get<Option<u32>>,
 {
 	fn build_metadata(docs: Vec<&'static str>, entries: &mut Vec<StorageEntryMetadata>) {
+		let docs = if cfg!(feature = "no-metadata-docs") { vec![] } else { docs };
+
 		let entry = StorageEntryMetadata {
 			name: Prefix::STORAGE_PREFIX,
 			modifier: QueryKind::METADATA,

frame/support/src/storage/types/map.rs

@@ -352,6 +352,8 @@ where
 	MaxValues: Get<Option<u32>>,
 {
 	fn build_metadata(docs: Vec<&'static str>, entries: &mut Vec<StorageEntryMetadata>) {
+		let docs = if cfg!(feature = "no-metadata-docs") { vec![] } else { docs };
+
 		let entry = StorageEntryMetadata {
 			name: Prefix::STORAGE_PREFIX,
 			modifier: QueryKind::METADATA,

frame/support/src/storage/types/nmap.rs

@@ -451,6 +451,8 @@ where
 	MaxValues: Get<Option<u32>>,
 {
 	fn build_metadata(docs: Vec<&'static str>, entries: &mut Vec<StorageEntryMetadata>) {
+		let docs = if cfg!(feature = "no-metadata-docs") { vec![] } else { docs };
+
 		let entry = StorageEntryMetadata {
 			name: Prefix::STORAGE_PREFIX,
 			modifier: QueryKind::METADATA,

frame/support/src/storage/types/value.rs

@@ -210,6 +210,8 @@ where
 	OnEmpty: crate::traits::Get<QueryKind::Query> + 'static,
 {
 	fn build_metadata(docs: Vec<&'static str>, entries: &mut Vec<StorageEntryMetadata>) {
+		let docs = if cfg!(feature = "no-metadata-docs") { vec![] } else { docs };
+
 		let entry = StorageEntryMetadata {
 			name: Prefix::STORAGE_PREFIX,
 			modifier: QueryKind::METADATA,

frame/support/test/Cargo.toml

@@ -52,3 +52,4 @@ try-runtime = ["frame-support/try-runtime"]
 conditional-storage = []
 # Disable ui tests
 disable-ui-tests = []
+no-metadata-docs = ["frame-support/no-metadata-docs"]

frame/support/test/tests/pallet.rs

@@ -1100,6 +1100,14 @@ fn migrate_from_pallet_version_to_storage_version() {
 fn metadata() {
 	use frame_support::metadata::*;
 
+	fn maybe_docs(doc: Vec<&'static str>) -> Vec<&'static str> {
+		if cfg!(feature = "no-metadata-docs") {
+			vec![]
+		} else {
+			doc
+		}
+	}
+
 	let pallets = vec![
 		PalletMetadata {
 			index: 1,
@@ -1269,7 +1277,7 @@ fn metadata() {
 						modifier: StorageEntryModifier::Default,
 						ty: StorageEntryType::Plain(meta_type::<u32>()),
 						default: vec![0, 0, 0, 0],
-						docs: vec!["Counter for the related counted storage map"],
+						docs: maybe_docs(vec!["Counter for the related counted storage map"]),
 					},
 					StorageEntryMetadata {
 						name: "Unbounded",
@@ -1287,13 +1295,13 @@ fn metadata() {
 					name: "MyGetParam",
 					ty: meta_type::<u32>(),
 					value: vec![10, 0, 0, 0],
-					docs: vec![" Some comment", " Some comment"],
+					docs: maybe_docs(vec![" Some comment", " Some comment"]),
 				},
 				PalletConstantMetadata {
 					name: "MyGetParam2",
 					ty: meta_type::<u32>(),
 					value: vec![11, 0, 0, 0],
-					docs: vec![" Some comment", " Some comment"],
+					docs: maybe_docs(vec![" Some comment", " Some comment"]),
 				},
 				PalletConstantMetadata {
 					name: "MyGetParam3",
@@ -1305,19 +1313,19 @@ fn metadata() {
 					name: "some_extra",
 					ty: meta_type::<u64>(),
 					value: vec![100, 0, 0, 0, 0, 0, 0, 0],
-					docs: vec![" Some doc", " Some doc"],
+					docs: maybe_docs(vec![" Some doc", " Some doc"]),
 				},
 				PalletConstantMetadata {
 					name: "some_extra_extra",
 					ty: meta_type::<u64>(),
 					value: vec![0, 0, 0, 0, 0, 0, 0, 0],
-					docs: vec![" Some doc"],
+					docs: maybe_docs(vec![" Some doc"]),
 				},
 				PalletConstantMetadata {
 					name: "SomeExtraRename",
 					ty: meta_type::<u64>(),
 					value: vec![0, 0, 0, 0, 0, 0, 0, 0],
-					docs: vec![" Some doc"],
+					docs: maybe_docs(vec![" Some doc"]),
 				},
 			],
 			error: Some(PalletErrorMetadata { ty: meta_type::<pallet::Error<Runtime>>() }),
@@ -1351,7 +1359,7 @@ fn metadata() {
 						modifier: StorageEntryModifier::Default,
 						ty: StorageEntryType::Plain(meta_type::<u32>()),
 						default: vec![0, 0, 0, 0],
-						docs: vec!["Counter for the related counted storage map"],
+						docs: maybe_docs(vec!["Counter for the related counted storage map"]),
 					},
 				],
 			}),
@@ -1362,6 +1370,16 @@ fn metadata() {
 		},
 	];
 
+	let empty_doc = pallets[0].event.as_ref().unwrap().ty.type_info().docs().is_empty() &&
+		pallets[0].error.as_ref().unwrap().ty.type_info().docs().is_empty() &&
+		pallets[0].calls.as_ref().unwrap().ty.type_info().docs().is_empty();
+
+	if cfg!(feature = "no-metadata-docs") {
+		assert!(empty_doc)
+	} else {
+		assert!(!empty_doc)
+	}
+
 	let extrinsic = ExtrinsicMetadata {
 		ty: meta_type::<UncheckedExtrinsic>(),
 		version: 4,

frame/support/test/tests/pallet_compatibility.rs

@@ -15,6 +15,10 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+// Old macros don't support the flag `no-metadata-docs` so the result differs when the feature is
+// activated.
+#![cfg(not(feature = "no-metadata-docs"))]
+
 use frame_support::traits::{ConstU32, ConstU64};
 
 pub trait SomeAssociation {

frame/support/test/tests/pallet_compatibility_instance.rs

@@ -15,6 +15,10 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+// Old macros don't support the flag `no-metadata-docs` so the result differs when the feature is
+// activated.
+#![cfg(not(feature = "no-metadata-docs"))]
+
 use frame_support::traits::{ConstU32, ConstU64};
 
 mod pallet_old {