Experiment with macro to reduce code duplication

Author: cmichi

crates/lang/src/env_access.rs

@@ -31,6 +31,34 @@ use ink_primitives::Key;
 
 use crate::ChainExtensionInstance;
 
+#[macro_export]
+macro_rules! mock_contract {
+        ( $($tt:tt)* ) => {{
+            #![cfg_attr(not(feature = "std"), no_std)]
+             use ::ink_lang as ink;
+             use ::ink_env::{
+                 Environment,
+                 DefaultEnvironment,
+                 call::{build_create, Selector, ExecutionInput, FromAccountId}
+             };
+             #[ink::contract]
+             pub mod my_contract {
+             #[ink(storage)]
+             pub struct MyContract { }
+
+             impl MyContract {
+             #[ink(constructor)]
+             pub fn new() -> Self {
+                 Self {}
+             }
+
+             $( $tt )*
+
+             }
+             }
+        }};
+    }
+
 /// The environment of the compiled ink! smart contract.
 pub trait ContractEnv {
     /// The environment type.
@@ -114,33 +142,15 @@ where
     /// # Example
     ///
     /// ```
-    /// #![cfg_attr(not(feature = "std"), no_std)]
-    /// use ink_lang as ink;
     /// use ink_prelude;
-    /// # use ::ink_env::{
-    /// #     Environment,
-    /// #     DefaultEnvironment,
-    /// #     call::{build_create, Selector, ExecutionInput, FromAccountId}
-    /// # };
-    /// # #[ink::contract]
-    /// # pub mod my_contract {
-    /// # #[ink(storage)]
-    /// # pub struct MyContract { }
-    /// #
-    /// # impl MyContract {
-    /// # #[ink(constructor)]
-    /// # pub fn new() -> Self {
-    /// #     Self {}
-    /// # }
-    ///
+    /// # ink_lang::mock_contract! {
     /// #[ink(message)]
-    /// pub fn call_me(&self) {
+    /// pub fn call_me2(&self) {
     ///     let caller = self.env().caller();
     ///     let message = ink_prelude::format!("got a call from {:?}", caller);
     ///     ink_env::debug_println(&message);
     /// }
     /// # }
-    /// # }
     /// ```
     ///
     /// # Note