feat: add commit hash to generated code

Cargo.toml

@@ -6,10 +6,14 @@ edition = "2021"
 description = """
 Tool for generating the StarkNet JSON-RPC code used in starknet-rs
 """
+build = "src/build.rs"
 
 [dependencies]
 anyhow = "1.0.66"
 indexmap = { version = "1.9.2", features = ["serde"] }
 regex = "1.7.0"
 serde = { version = "1.0.149", features = ["derive"] }
 serde_json = "1.0.89"
+
+[build-dependencies]
+built = { version = "0.5.2", features = ["git2"] }

src/build.rs

@@ -0,0 +1,3 @@
+fn main() {
+    built::write_built_file().expect("Failed to acquire build-time information")
+}

src/main.rs

@@ -7,6 +7,10 @@ use crate::spec::*;
 
 mod spec;
 
+mod built_info {
+    include!(concat!(env!("OUT_DIR"), "/built.rs"));
+}
+
 const MAX_LINE_LENGTH: usize = 100;
 
 const TARGET_VERSION: SpecVersion = SpecVersion::V0_2_1;
@@ -601,6 +605,15 @@ fn main() {
     println!("// To change the code generated, modify the codegen tool instead:");
     println!("//     https://github.com/xJonathanLEI/starknet-jsonrpc-codegen");
     println!();
+    println!("// Code generated with version:");
+    match built_info::GIT_COMMIT_HASH {
+        Some(commit_hash) => println!(
+            "//     https://github.com/xJonathanLEI/starknet-jsonrpc-codegen#{}",
+            commit_hash
+        ),
+        None => println!("    <Unable to determine Git commit hash>"),
+    }
+    println!();
 
     if !profile.ignore_types.is_empty() {
         println!("// These types are ignored from code generation. Implement them manually:");