[sui][cli] Add support for shell completion in CLI using clap_complete

Cargo.toml

@@ -340,6 +340,7 @@ camino = "1.1.1"
 cfg-if = "1.0.0"
 chrono = { version = "0.4.39", features = ["clock", "serde"] }
 clap = { version = "4.4", features = ["derive", "wrap_help"] }
+clap_complete = "4.4"
 codespan-reporting = "0.11.1"
 collectable = "0.0.2"
 colored = "2.0.0"

crates/sui/Cargo.toml

@@ -22,6 +22,7 @@ bin-version.workspace = true
 bip32.workspace = true
 camino.workspace = true
 clap.workspace = true
+clap_complete.workspace = true
 codespan-reporting.workspace = true
 datatest-stable.workspace = true
 futures.workspace = true

crates/sui/src/sui_commands.rs

@@ -404,6 +404,14 @@ pub enum SuiCommand {
         #[command(flatten)]
         replay_config: SR2::ReplayConfigStable,
     },
+
+    /// Generate shell completion scripts for CLI
+    #[clap(name = "completion")]
+    Completion {
+        /// If provided, outputs the completion file for given shell
+        #[arg(long = "generate", value_enum)]
+        generator: clap_complete::Shell,
+    },
 }
 
 impl SuiCommand {
@@ -839,6 +847,12 @@ impl SuiCommand {
 
                 Ok(())
             }
+            SuiCommand::Completion { generator } => {
+                let mut app: Command = SuiCommand::command();
+                let name = app.get_name().to_string();
+                clap_complete::generate(generator, &mut app, name, &mut std::io::stdout());
+                Ok(())
+            }
         }
     }
 }