Tx (change) output splitter (#1369)

* wip - split change into many outputs for testing

* rustfmt

* add change_outputs param to wallet send
default to 1

* commit

* rustfmt

* cleanup

* fixup servers tests

src/bin/cmd/wallet.rs

@@ -170,6 +170,11 @@ pub fn wallet_command(wallet_args: &ArgMatches, global_config: GlobalConfig) {
 				let dest = send_args
 					.value_of("dest")
 					.expect("Destination wallet address required");
+				let change_outputs = send_args
+					.value_of("change_outputs")
+					.unwrap()
+					.parse()
+					.expect("Failed to parse number of change outputs.");
 				let fluff = send_args.is_present("fluff");
 				let max_outputs = 500;
 				if dest.starts_with("http") {
@@ -178,6 +183,7 @@ pub fn wallet_command(wallet_args: &ArgMatches, global_config: GlobalConfig) {
 						minimum_confirmations,
 						dest,
 						max_outputs,
+						change_outputs,
 						selection_strategy == "all",
 					);
 					let slate = match result {
@@ -223,6 +229,7 @@ pub fn wallet_command(wallet_args: &ArgMatches, global_config: GlobalConfig) {
 						minimum_confirmations,
 						dest,
 						max_outputs,
+						change_outputs,
 						selection_strategy == "all",
 					).expect("Send failed");
 					Ok(())

src/bin/grin.rs

@@ -201,6 +201,12 @@ fn main() {
 				.possible_values(&["all", "smallest"])
 				.default_value("all")
 				.takes_value(true))
+			.arg(Arg::with_name("change_outputs")
+				.help("Number of change outputs to generate (mainly for testing).")
+				.short("o")
+				.long("change_outputs")
+				.default_value("1")
+				.takes_value(true))
 			.arg(Arg::with_name("dest")
 				.help("Send the transaction to the provided server")
 				.short("d")