Initial rebrand from paritytech/subxt to pezkuwichain/pezkuwi-subxt

- Renamed all subxt crates to pezkuwi-subxt
- Updated internal references
- Configured for Pezkuwi ecosystem

codegen/src/api/errors.rs

@@ -0,0 +1,34 @@
+// Copyright 2019-2025 Parity Technologies (UK) Ltd.
+// This file is dual-licensed as Apache-2.0 or GPL-3.0.
+// see LICENSE for license details.
+
+use pezkuwi_subxt_metadata::PalletMetadata;
+use proc_macro2::TokenStream as TokenStream2;
+use quote::quote;
+use scale_typegen::TypeGenerator;
+
+use super::CodegenError;
+use scale_typegen::typegen::ir::ToTokensWithSettings;
+
+/// Generate error type alias from the provided pallet metadata.
+pub fn generate_error_type_alias(
+	type_gen: &TypeGenerator,
+	pallet: &PalletMetadata,
+) -> Result<TokenStream2, CodegenError> {
+	let Some(error_ty) = pallet.error_ty_id() else {
+		return Ok(quote!());
+	};
+
+	let error_type = type_gen.resolve_type_path(error_ty)?.to_token_stream(type_gen.settings());
+	let error_ty = type_gen.resolve_type(error_ty)?;
+	let docs = &error_ty.docs;
+	let docs = type_gen
+		.settings()
+		.should_gen_docs
+		.then_some(quote! { #( #[doc = #docs ] )* })
+		.unwrap_or_default();
+	Ok(quote! {
+		#docs
+		pub type Error = #error_type;
+	})
+}