add bin attr

src/check.rs

@@ -67,6 +67,7 @@ pub async fn run_checks(cfg: CheckConfig) -> eyre::Result<bool> {
             opt_level: project::OptLevel::default(),
             nightly: cfg.nightly,
             rebuild: true,
+            bin: cfg.bin.clone(),
         })
         .map_err(|e| eyre!("failed to build project to WASM: {e}"))?,
     };

src/deploy.rs

@@ -117,6 +117,7 @@ programs to Stylus chains here https://docs.arbitrum.io/stylus/stylus-quickstart
                 opt_level: project::OptLevel::default(),
                 nightly: cfg.check_cfg.nightly,
                 rebuild: false, // The check step at the start of this command rebuilt.
+                bin: cfg.check_cfg.bin,
             })
             .map_err(|e| eyre!("could not build project to WASM: {e}"))?,
         };

src/main.rs

@@ -90,6 +90,11 @@ pub struct CheckConfig {
     /// to the current Stylus testnet RPC endpoint.
     #[arg(short, long, default_value = "https://stylus-testnet.arbitrum.io/rpc")]
     endpoint: String,
+    /// Build only the specified binary (See cargo's `--bin` attribute
+    /// https://doc.rust-lang.org/cargo/commands/cargo-build.html#target-selection)
+    /// Useful for projects with workspaces that have multiple contracts.
+    #[arg(long)]
+    bin: Option<String>,
     /// If desired, it loads a WASM file from a specified path. If not provided, it will try to find
     /// a WASM file under the current working directory's Rust target release directory and use its
     /// contents for the deploy command.

src/project.rs

@@ -26,6 +26,7 @@ pub struct BuildConfig {
     pub opt_level: OptLevel,
     pub nightly: bool,
     pub rebuild: bool,
+    pub bin: Option<String>,
 }
 
 #[derive(thiserror::Error, Debug, PartialEq, Eq, Clone)]
@@ -82,6 +83,11 @@ pub fn build_project_to_wasm(cfg: BuildConfig) -> eyre::Result<PathBuf> {
             cmd.arg("profile.release.opt-level='z'");
         }
 
+        if let Some(bin) = &cfg.bin {
+            cmd.arg("--bin");
+            cmd.arg(bin);
+        }
+
         let output = cmd
             .arg("--release")
             .arg(format!("--target={}", RUST_TARGET))
@@ -106,8 +112,18 @@ pub fn build_project_to_wasm(cfg: BuildConfig) -> eyre::Result<PathBuf> {
     let wasm_file_path = release_files
         .into_iter()
         .find(|p| {
-            if let Some(ext) = p.file_name() {
-                return ext.to_str().unwrap_or_default().contains(".wasm");
+            if let Some(file_name) = p.file_name() {
+                let file_name = file_name.to_str().unwrap_or_default();
+
+                if !file_name.contains(".wasm") {
+                    return false;
+                }
+
+                if let Some(bin) = &cfg.bin {
+                    return file_name.contains(bin);
+                }
+
+                return true;
             }
             false
         })
@@ -129,6 +145,7 @@ https://github.com/OffchainLabs/cargo-stylus/blob/main/OPTIMIZING_BINARIES.md"#,
                         opt_level: OptLevel::Z,
                         nightly: cfg.nightly,
                         rebuild: true,
+                        bin: cfg.bin,
                     });
                 }
                 OptLevel::Z => {
@@ -146,6 +163,7 @@ https://github.com/OffchainLabs/cargo-stylus/blob/main/OPTIMIZING_BINARIES.md"#,
                             opt_level: OptLevel::Z,
                             nightly: true,
                             rebuild: true,
+                            bin: cfg.bin,
                         });
                     }
                     return Err(BuildError::ExceedsMaxDespiteBestEffort {