Extend PalletInfoAccess with module_name and crate_version method (#9690)

* Record pallet indices in CallMetadata

* Resurrect PalletVersion infrastructure and rename as CrateVersion

* cargo fmt

* Add missing runtime generics to pallet struct

* Fix path to instance

* Fix test

* Fix UI test expectations

* Fix UI test expectations

* Move crate_version function to PalletInfoAccess

* Update UI test expectations

* Add crate_name method to PalletInfo

* Convert path to module name instead of exposing crate name

* cargo fmt

* Keep the double colons when constructing the module name

* Remove unused import

* Update UI test expectations

* Update frame/support/src/traits/metadata.rs

Co-authored-by: Guillaume Thiolliere <gui.thiolliere@gmail.com>

* Update UI test expectations

Co-authored-by: Guillaume Thiolliere <gui.thiolliere@gmail.com>

substrate/frame/support/procedural/src/crate_version.rs

@@ -0,0 +1,54 @@
+// This file is part of Substrate.
+
+// Copyright (C) 2020-2021 Parity Technologies (UK) Ltd.
+// SPDX-License-Identifier: Apache-2.0
+
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// 	http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//! Implementation of macros related to crate versioning.
+
+use super::get_cargo_env_var;
+use frame_support_procedural_tools::generate_crate_access_2018;
+use proc_macro2::{Span, TokenStream};
+use syn::{Error, Result};
+
+/// Create an error that will be shown by rustc at the call site of the macro.
+fn create_error(message: &str) -> Error {
+	Error::new(Span::call_site(), message)
+}
+
+/// Implementation of the `crate_to_crate_version!` macro.
+pub fn crate_to_crate_version(input: proc_macro::TokenStream) -> Result<TokenStream> {
+	if !input.is_empty() {
+		return Err(create_error("No arguments expected!"))
+	}
+
+	let major_version = get_cargo_env_var::<u16>("CARGO_PKG_VERSION_MAJOR")
+		.map_err(|_| create_error("Major version needs to fit into `u16`"))?;
+
+	let minor_version = get_cargo_env_var::<u8>("CARGO_PKG_VERSION_MINOR")
+		.map_err(|_| create_error("Minor version needs to fit into `u8`"))?;
+
+	let patch_version = get_cargo_env_var::<u8>("CARGO_PKG_VERSION_PATCH")
+		.map_err(|_| create_error("Patch version needs to fit into `u8`"))?;
+
+	let crate_ = generate_crate_access_2018("frame-support")?;
+
+	Ok(quote::quote! {
+		#crate_::traits::CrateVersion {
+			major: #major_version,
+			minor: #minor_version,
+			patch: #patch_version,
+		}
+	})
+}