Encode constructor args

crates/cast/bin/cmd/constructor_args.rs

@@ -1,3 +1,4 @@
+use alloy_dyn_abi::DynSolType;
 use alloy_primitives::{Address, Bytes};
 use clap::{command, Parser};
 use eyre::{eyre, OptionExt, Result};
@@ -87,9 +88,17 @@ async fn parse_constructor_args(
         .enumerate()
         .map(|(i, arg)| {
             let arg = arg.to_vec();
-            format!("{} {}", constructor.inputs[i].ty, Bytes::from(arg))
+            format_arg(&constructor.inputs[i].ty, arg).expect("Failed to format argument.")
         })
         .collect();
 
     Ok(display_args)
 }
+
+fn format_arg(ty: &str, arg: Vec<u8>) -> Result<String> {
+    let arg_type: DynSolType = ty.parse().expect("Invalid ABI type.");
+    let bytes = Bytes::from(arg.clone());
+    let decoded = arg_type.abi_decode(&arg)?;
+
+    Ok(format!("{bytes} -> {decoded:?}"))
+}

crates/cast/tests/cli/main.rs

@@ -1368,10 +1368,10 @@ casttest!(fetch_creation_code_only_args_from_etherscan, |_prj, cmd| {
 
 // tests that displays a sample contract creation args
 // <https://etherscan.io/address/0x0923cad07f06b2d0e5e49e63b8b35738d4156b95>
-casttest!(fetch_creation_args_from_etherscan, |_prj, cmd| {
+casttest!(fetch_constructor_args_from_etherscan, |_prj, cmd| {
     let eth_rpc_url = next_http_rpc_endpoint();
     cmd.args([
-        "creation-args",
+        "constructor-args",
         "--etherscan-api-key",
         &next_mainnet_etherscan_api_key(),
         "0x6982508145454ce325ddbe47a25d4ec3d2311933",
@@ -1380,7 +1380,7 @@ casttest!(fetch_creation_args_from_etherscan, |_prj, cmd| {
     ])
     .assert_success()
     .stdout_eq(str![[r#"
-uint256 0x00000000000000000000000000000000000014bddab3e51a57cff87a50000000
+0x00000000000000000000000000000000000014bddab3e51a57cff87a50000000 -> Uint(420690000000000000000000000000000, 256)
 
 "#]]);
 });